[2155] | 1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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| 2 | // |
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| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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| 4 | // you may not use this file except in compliance with the License. |
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| 5 | // You may obtain a copy of the License at |
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| 6 | // |
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| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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| 8 | // |
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| 9 | // Unless required by applicable law or agreed to in writing, software |
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| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 12 | // See the License for the specific language governing permissions and |
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| 13 | // limitations under the License. |
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| 14 | |
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| 15 | package de.ugoe.cs.autoquest.genericeventmonitor; |
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| 16 | |
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| 17 | import java.io.IOException; |
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| 18 | import java.io.InputStream; |
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| 19 | import java.io.InputStreamReader; |
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| 20 | import java.net.MalformedURLException; |
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| 21 | import java.net.URL; |
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| 22 | import java.util.ArrayList; |
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| 23 | import java.util.HashMap; |
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| 24 | import java.util.List; |
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| 25 | import java.util.Map; |
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| 26 | import java.util.Set; |
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| 27 | |
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| 28 | import javax.servlet.ServletException; |
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| 29 | import javax.servlet.http.HttpServletRequest; |
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| 30 | import javax.servlet.http.HttpServletResponse; |
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| 31 | |
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| 32 | import org.eclipse.jetty.servlet.DefaultServlet; |
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| 33 | import org.json.simple.JSONArray; |
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| 34 | import org.json.simple.JSONObject; |
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| 35 | import org.json.simple.JSONValue; |
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| 36 | import org.json.simple.parser.ParseException; |
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| 37 | |
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| 38 | import de.ugoe.cs.util.console.Console; |
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| 39 | |
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| 40 | /** |
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| 41 | * <p> |
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| 42 | * the servlet deployed in the web server that receives all generic events. The messages are parsed, |
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| 43 | * validated, and forwarded to the provided message listener. If a message is not valid, it is |
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| 44 | * discarded. If an event in a message is not valid, it is discarded. Messages are only received via |
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| 45 | * the POST HTTP method. |
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| 46 | * </p> |
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| 47 | * |
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| 48 | * @author Patrick Harms |
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| 49 | */ |
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| 50 | class GenericEventMonitorServlet extends DefaultServlet { |
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| 51 | |
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| 52 | /** */ |
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| 53 | private static final long serialVersionUID = 1L; |
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| 54 | |
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| 55 | /** must be true to do some detailed logging of what the server does */ |
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| 56 | private static final boolean DO_TRACE = false; |
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| 57 | |
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| 58 | /** |
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| 59 | * the map of event target ids to the concrete target objects. |
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| 60 | */ |
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[2244] | 61 | private transient Map<String, GenericEventTarget> eventTargets = new HashMap<>(); |
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[2155] | 62 | |
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| 63 | /** |
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| 64 | * the message listener to forward received messages to. |
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| 65 | */ |
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[2244] | 66 | private transient GenericEventMonitorMessageListener messageListener; |
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[2155] | 67 | |
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| 68 | /** |
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| 69 | * <p> |
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| 70 | * initializes the servlet with the message listener to which all events shall be forwarded |
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| 71 | * </p> |
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| 72 | * |
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| 73 | * @param messageListener the message listener that shall receive all events |
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| 74 | */ |
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| 75 | GenericEventMonitorServlet(GenericEventMonitorMessageListener messageListener) { |
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| 76 | this.messageListener = messageListener; |
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| 77 | } |
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| 78 | |
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| 79 | /** |
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| 80 | * this implements handling of doPost. For this servlet this means that |
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| 81 | * the data from the post request will be parsed and validated. |
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| 82 | * |
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| 83 | * (non-Javadoc) |
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| 84 | * @see org.mortbay.jetty.servlet.DefaultServlet#doPost(HttpServletRequest, HttpServletResponse) |
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| 85 | */ |
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| 86 | @Override |
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| 87 | protected void doPost(HttpServletRequest request, HttpServletResponse response) |
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| 88 | throws ServletException, IOException |
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| 89 | { |
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| 90 | Object value = null; |
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| 91 | try { |
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| 92 | //InputStream requestInputStream = dumpStreamContent(request.getInputStream()); |
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| 93 | InputStream requestInputStream = request.getInputStream(); |
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| 94 | |
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| 95 | value = JSONValue.parseWithException |
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| 96 | (new InputStreamReader(requestInputStream, "UTF-8")); |
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| 97 | |
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| 98 | if (!(value instanceof JSONObject)) { |
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| 99 | Console.printerrln("incoming data is not of the expected type --> discarding it"); |
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| 100 | } |
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| 101 | else { |
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| 102 | handleJSONObject((JSONObject) value); |
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| 103 | } |
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| 104 | } |
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| 105 | catch (ParseException e) { |
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| 106 | Console.printerrln |
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| 107 | ("could not parse incoming data --> discarding it (" + e.toString() + ")"); |
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| 108 | } |
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| 109 | |
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| 110 | // this must be done to prevent firefox from notifying the "element not found" error |
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| 111 | response.setContentType("text/plain"); |
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| 112 | response.getOutputStream().write(' '); |
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| 113 | } |
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| 114 | |
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| 115 | /** |
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| 116 | * <p> |
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| 117 | * processes a received JSON object and validates it. If the message is ok, it is forwarded |
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| 118 | * to the message listener |
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| 119 | * </p> |
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| 120 | * |
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| 121 | * @param object the JSON object that contains a client message |
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| 122 | */ |
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| 123 | private void handleJSONObject(JSONObject object) { |
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| 124 | if (DO_TRACE) { |
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| 125 | dumpJSONObject(object, ""); |
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| 126 | } |
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| 127 | |
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| 128 | JSONObject message = assertValue(object, "message", JSONObject.class); |
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| 129 | |
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| 130 | if (message == null) { |
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| 131 | Console.printerrln("incoming data is no valid message --> discarding it"); |
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| 132 | } |
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| 133 | else { |
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| 134 | ClientInfos clientInfos = extractClientInfos(message); |
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| 135 | |
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| 136 | if (clientInfos == null) { |
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| 137 | Console.printerrln |
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| 138 | ("incoming message does not contain valid client infos --> discarding it"); |
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| 139 | } |
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| 140 | else { |
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| 141 | extractGenericEventTargets(message, clientInfos); |
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| 142 | GenericEvent[] events = extractGenericEvents(message, clientInfos); |
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| 143 | |
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| 144 | if (events == null) { |
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| 145 | Console.printerrln |
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| 146 | ("incoming message does not contain valid events --> discarding it"); |
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| 147 | } |
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| 148 | else { |
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| 149 | messageListener.handleEvents(clientInfos, events); |
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| 150 | Console.println |
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| 151 | ("handled message of " + clientInfos.getClientId() + " for app " + |
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| 152 | clientInfos.getAppId() + " (" + events.length + " events)"); |
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| 153 | } |
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| 154 | } |
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| 155 | } |
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| 156 | } |
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| 157 | |
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| 158 | /** |
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| 159 | * <p> |
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| 160 | * tries to extract the client infos out of the received JSON object. If this is not fully |
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| 161 | * possible, an appropriate message is dumped and the whole message is discarded (the method |
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| 162 | * return null). |
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| 163 | * </p> |
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| 164 | * |
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| 165 | * @param message the message to parse the client infos from |
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| 166 | * |
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| 167 | * @return the client infos, if the message is valid in this respect, or null if not |
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| 168 | */ |
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| 169 | private ClientInfos extractClientInfos(JSONObject message) { |
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| 170 | ClientInfos clientInfos = null; |
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| 171 | |
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| 172 | JSONObject infos = assertValue(message, "clientInfos", JSONObject.class); |
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| 173 | |
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| 174 | if (infos != null) { |
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| 175 | String clientId = assertValue((JSONObject) infos, "clientId", String.class); |
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| 176 | String appId = assertValue((JSONObject) infos, "appId", String.class); |
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| 177 | |
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| 178 | if (clientId == null) { |
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| 179 | Console.printerrln("client infos do not contain a valid client id"); |
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| 180 | } |
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| 181 | else if (appId == null) { |
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| 182 | Console.printerrln("client infos do not contain a valid application id"); |
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| 183 | } |
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| 184 | else { |
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| 185 | clientInfos = new ClientInfos(clientId, appId); |
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| 186 | } |
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| 187 | } |
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| 188 | |
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| 189 | return clientInfos; |
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| 190 | } |
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| 191 | |
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| 192 | /** |
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| 193 | * <p> |
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| 194 | * tries to extract the events out of the received JSON object. If this is not fully |
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| 195 | * possible, an appropriate message is dumped and the errorprone event is discarded. If no |
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| 196 | * valid event is found, the whole message is discarded. |
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| 197 | * </p> |
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| 198 | * |
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| 199 | * @param object the message to parse the events from |
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| 200 | * @param clientInfos the infos about the client that send the events |
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| 201 | * |
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| 202 | * @return the valid events stored in the message, or null if there are none |
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| 203 | */ |
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| 204 | private GenericEvent[] extractGenericEvents(JSONObject object, ClientInfos clientInfos) { |
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| 205 | List<GenericEvent> events = null; |
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| 206 | |
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| 207 | JSONArray eventArray = assertValue(object, "events", JSONArray.class); |
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| 208 | |
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| 209 | if (eventArray != null) { |
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| 210 | events = new ArrayList<GenericEvent>(); |
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| 211 | |
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| 212 | for (int i = 0; i < eventArray.size(); i++) { |
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| 213 | Object eventObj = eventArray.get(i); |
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| 214 | if (!(eventObj instanceof JSONObject)) { |
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| 215 | Console.printerrln("event number " + (i + 1) + " is not a valid event object"); |
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| 216 | } |
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| 217 | else { |
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| 218 | Long time = assertValue(((JSONObject) eventObj), "time", Long.class); |
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| 219 | String eventType = |
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[2163] | 220 | assertValue(((JSONObject) eventObj), "type", String.class); |
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[2155] | 221 | String eventTargetId = |
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[2163] | 222 | assertValue(((JSONObject) eventObj), "targetId", String.class); |
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[2155] | 223 | |
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| 224 | if (eventType == null) { |
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| 225 | Console.printerrln("event number " + (i + 1) + " has no valid event type"); |
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| 226 | } |
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| 227 | else if (eventTargetId == null) { |
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| 228 | Console.printerrln(eventType + " event has no valid target id"); |
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| 229 | } |
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| 230 | else if (time == null) { |
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| 231 | Console.printerrln(eventType + " event has no valid timestamp"); |
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| 232 | } |
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| 233 | else { |
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| 234 | GenericEventTarget target = eventTargets.get(eventTargetId); |
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| 235 | Map<String, String> parameters = getParameters |
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[2163] | 236 | (((JSONObject) eventObj), "time", "type", "targetId"); |
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[2155] | 237 | |
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| 238 | if (target != null) { |
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| 239 | events.add(new GenericEvent(clientInfos, time, target, eventType, |
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| 240 | parameters)); |
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| 241 | } |
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| 242 | else { |
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| 243 | Console.printerrln(eventType + " event has no known target"); |
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| 244 | } |
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| 245 | } |
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| 246 | } |
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| 247 | } |
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| 248 | |
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| 249 | } |
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| 250 | |
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| 251 | if ((events != null) && (events.size() > 0)) { |
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| 252 | return events.toArray(new GenericEvent[events.size()]); |
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| 253 | } |
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| 254 | else { |
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| 255 | return null; |
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| 256 | } |
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| 257 | } |
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| 258 | |
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| 259 | /** |
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| 260 | * <p> |
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| 261 | * extracts the event target structure from the provided JSON object. |
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| 262 | * </p> |
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| 263 | * |
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| 264 | * @param object the JSON object to extract the event target structure from |
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| 265 | * @param clientInfos infos about the client who send the data |
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| 266 | * |
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| 267 | * @return the event target structure extracted from the JSON object of which the root nodes |
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| 268 | * are provided |
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| 269 | */ |
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| 270 | private GenericEventTarget[] extractGenericEventTargets(JSONObject object, |
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| 271 | ClientInfos clientInfos) |
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| 272 | { |
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| 273 | JSONObject[] jsonTargets = assertValue(object, "targetStructure", JSONObject[].class); |
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| 274 | |
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| 275 | if (jsonTargets != null) { |
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| 276 | GenericEventTarget[] result = new GenericEventTarget[jsonTargets.length]; |
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| 277 | |
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| 278 | for (int i = 0; i < jsonTargets.length; i++) { |
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| 279 | result[i] = convert(jsonTargets[i], null); |
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| 280 | } |
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| 281 | |
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| 282 | return result; |
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| 283 | } |
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| 284 | else { |
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| 285 | return null; |
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| 286 | } |
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| 287 | } |
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| 288 | |
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| 289 | /** |
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| 290 | * <p> |
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| 291 | * converts a JSON object representing a target to the generic target. Calls |
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| 292 | * itself recursively to also convert the children of the element, if any. |
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| 293 | * </p> |
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| 294 | * |
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| 295 | * @param jsonTarget the JSON object to be converted |
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| 296 | * @param parent the parent target of the converted element, or null, if none |
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| 297 | * is present. |
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| 298 | * |
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| 299 | * @return as described. |
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| 300 | */ |
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| 301 | private GenericEventTarget convert(JSONObject jsonTarget, |
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| 302 | GenericEventTarget parent) |
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| 303 | { |
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| 304 | GenericEventTarget result = null; |
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| 305 | |
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| 306 | if (jsonTarget != null) { |
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| 307 | String targetId = assertValue(jsonTarget, "targetId", String.class); |
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| 308 | Map<String, String> parameters = getParameters(jsonTarget, "targetId", "children"); |
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| 309 | |
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| 310 | result = new GenericEventTarget(targetId, parameters, parent); |
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| 311 | |
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| 312 | JSONArray childElements = assertValue(jsonTarget, "children", JSONArray.class); |
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| 313 | |
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| 314 | if (childElements != null) { |
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| 315 | Object jsonChild; |
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| 316 | |
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| 317 | for (int i = 0; i < childElements.size(); i++) { |
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| 318 | jsonChild = childElements.get(i); |
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| 319 | if (!(jsonChild instanceof JSONObject)) { |
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| 320 | Console.printerrln("child " + (i + 1) + " of target " + targetId + |
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| 321 | " is no valid event target"); |
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| 322 | } |
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| 323 | else { |
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| 324 | result.addChild(convert((JSONObject) jsonChild, result)); |
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| 325 | } |
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| 326 | } |
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| 327 | } |
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| 328 | |
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| 329 | } |
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| 330 | |
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| 331 | if (result != null) { |
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| 332 | eventTargets.put(result.getId(), result); |
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| 333 | } |
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| 334 | |
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| 335 | return result; |
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| 336 | } |
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| 337 | |
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| 338 | /** |
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| 339 | * <p> |
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| 340 | * converts a value in the provided object matching the provided key to the provided type. If |
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| 341 | * there is no value with the key or if the value can not be transformed to the provided type, |
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| 342 | * the method returns null. |
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| 343 | * </p> |
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| 344 | * |
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| 345 | * @param object the object to read the value from |
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| 346 | * @param key the key of the value |
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| 347 | * @param clazz the type to which the value should be transformed |
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| 348 | * |
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| 349 | * @return the value or null if either the value does not exist or if it can not be transformed |
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| 350 | * to the expected type |
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| 351 | */ |
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| 352 | @SuppressWarnings("unchecked") |
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| 353 | private <T> T assertValue(JSONObject object, String key, Class<T> clazz) { |
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| 354 | Object value = object.get(key); |
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| 355 | T result = null; |
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| 356 | |
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| 357 | if (clazz.isInstance(value)) { |
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| 358 | result = (T) value; |
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| 359 | } |
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| 360 | else if (value instanceof String) { |
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| 361 | if (URL.class.equals(clazz)) { |
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| 362 | try { |
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| 363 | result = (T) new URL((String) value); |
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| 364 | } |
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| 365 | catch (MalformedURLException e) { |
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| 366 | e.printStackTrace(); |
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| 367 | Console.printerrln("retrieved malformed URL for key '" + key + "': " + value + |
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| 368 | " (" + e.toString() + ")"); |
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| 369 | } |
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| 370 | } |
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| 371 | else if ((int.class.equals(clazz)) || (Integer.class.equals(clazz))) { |
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| 372 | try { |
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| 373 | result = (T) Integer.valueOf(Integer.parseInt((String) value)); |
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| 374 | } |
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| 375 | catch (NumberFormatException e) { |
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| 376 | Console.printerrln |
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| 377 | ("retrieved malformed integer for key '" + key + "': " + value); |
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| 378 | } |
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| 379 | } |
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| 380 | else if ((long.class.equals(clazz)) || (Long.class.equals(clazz))) { |
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| 381 | try { |
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| 382 | result = (T) Long.valueOf(Long.parseLong((String) value)); |
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| 383 | } |
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| 384 | catch (NumberFormatException e) { |
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| 385 | Console.printerrln |
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| 386 | ("retrieved malformed long for key '" + key + "': " + value); |
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| 387 | } |
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| 388 | } |
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| 389 | } |
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| 390 | else if (value instanceof Long) { |
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| 391 | if ((int.class.equals(clazz)) || (Integer.class.equals(clazz))) { |
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| 392 | result = (T) (Integer) ((Long) value).intValue(); |
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| 393 | } |
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| 394 | } |
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| 395 | else if (value instanceof JSONArray) { |
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| 396 | if ((int[].class.equals(clazz)) || (Integer[].class.equals(clazz))) { |
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| 397 | Integer[] resultArray = new Integer[((JSONArray) value).size()]; |
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| 398 | boolean allCouldBeParsed = true; |
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| 399 | |
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| 400 | for (int i = 0; i < ((JSONArray) value).size(); i++) { |
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| 401 | try { |
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| 402 | if (((JSONArray) value).get(i) instanceof Long) { |
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| 403 | resultArray[i] = (int) (long) (Long) ((JSONArray) value).get(i); |
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| 404 | } |
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| 405 | else if (((JSONArray) value).get(i) instanceof String) { |
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| 406 | try { |
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| 407 | resultArray[i] = |
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| 408 | (int) Long.parseLong((String) ((JSONArray) value).get(i)); |
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| 409 | } |
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| 410 | catch (NumberFormatException e) { |
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| 411 | Console.printerrln |
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| 412 | ("retrieved malformed integer array for key '" + key + "': " + |
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| 413 | value); |
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| 414 | |
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| 415 | allCouldBeParsed = false; |
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| 416 | break; |
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| 417 | } |
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| 418 | } |
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| 419 | else { |
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| 420 | Console.printerrln |
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| 421 | ("can not handle type of value in expected integer array '" + key + |
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| 422 | "': " + value); |
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| 423 | } |
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| 424 | } |
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| 425 | catch (ClassCastException e) { |
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| 426 | e.printStackTrace(); |
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| 427 | Console.printerrln("expected integer array for key '" + key + |
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| 428 | "' but it was something else: " + value); |
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| 429 | |
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| 430 | allCouldBeParsed = false; |
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| 431 | break; |
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| 432 | } |
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| 433 | } |
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| 434 | |
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| 435 | if (allCouldBeParsed) { |
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| 436 | result = (T) resultArray; |
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| 437 | } |
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| 438 | } |
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| 439 | else if (JSONObject[].class.equals(clazz)) { |
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| 440 | JSONObject[] resultArray = new JSONObject[((JSONArray) value).size()]; |
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| 441 | boolean allCouldBeParsed = true; |
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| 442 | |
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| 443 | for (int i = 0; i < ((JSONArray) value).size(); i++) { |
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| 444 | try { |
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| 445 | if (((JSONArray) value).get(i) instanceof JSONObject) { |
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| 446 | resultArray[i] = (JSONObject) ((JSONArray) value).get(i); |
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| 447 | } |
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| 448 | } |
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| 449 | catch (ClassCastException e) { |
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| 450 | e.printStackTrace(); |
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| 451 | Console.printerrln("expected JSON Object array for key '" + key + |
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| 452 | "' but it was something else: " + value); |
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| 453 | |
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| 454 | allCouldBeParsed = false; |
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| 455 | break; |
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| 456 | } |
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| 457 | } |
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| 458 | |
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| 459 | if (allCouldBeParsed) { |
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| 460 | result = (T) resultArray; |
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| 461 | } |
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| 462 | } |
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| 463 | } |
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| 464 | |
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| 465 | return result; |
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| 466 | } |
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| 467 | |
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| 468 | /** |
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| 469 | * <p> |
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| 470 | * determines other parameters provided in the JSON object. The parameters with the provided |
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| 471 | * keys to ignore are not put into the resulting map. |
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| 472 | * </p> |
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| 473 | * |
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| 474 | * @param object the object, from which parameters shall be read |
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| 475 | * @param ignoredKeys the parameters not to be put into the resulting map |
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| 476 | * |
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| 477 | * @return a map with the parameters contained in the provided JSON object |
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| 478 | */ |
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| 479 | private Map<String, String> getParameters(JSONObject object, String ... ignoredKeys) { |
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| 480 | Map<String, String> result = new HashMap<>(); |
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| 481 | |
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| 482 | NEXT_KEY: |
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| 483 | for (Object key : object.keySet()) { |
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| 484 | if (!(key instanceof String)) { |
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| 485 | continue NEXT_KEY; |
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| 486 | } |
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| 487 | |
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| 488 | for (String ignoredKey : ignoredKeys) { |
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| 489 | if (ignoredKey.equals(key)) { |
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| 490 | continue NEXT_KEY; |
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| 491 | } |
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| 492 | } |
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| 493 | |
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| 494 | String value = assertValue(object, (String) key, String.class); |
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| 495 | |
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| 496 | result.put((String) key, value); |
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| 497 | } |
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| 498 | |
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| 499 | return result; |
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| 500 | } |
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| 501 | |
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| 502 | /** |
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| 503 | * <p> |
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| 504 | * convenience method for dumping the content of a stream and returning a new stream |
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| 505 | * containing the same data. |
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| 506 | * </p> |
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| 507 | * |
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| 508 | * @param inputStream the stream to be dumped and copied |
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| 509 | * @return the copy of the stream |
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| 510 | * |
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| 511 | * @throws IOException if the stream can not be read |
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| 512 | */ |
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| 513 | /* private InputStream dumpStreamContent(ServletInputStream inputStream) throws IOException { |
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| 514 | List<Byte> bytes = new ArrayList<Byte>(); |
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| 515 | int buf; |
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| 516 | |
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| 517 | while ((buf = inputStream.read()) >= 0) { |
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| 518 | bytes.add((byte) buf); |
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| 519 | } |
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| 520 | |
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| 521 | byte[] byteArray = new byte[bytes.size()]; |
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| 522 | for (int i = 0; i < bytes.size(); i++) { |
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| 523 | byteArray[i] = bytes.get(i); |
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| 524 | } |
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| 525 | |
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| 526 | System.out.println(new String(byteArray, "UTF-8")); |
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| 527 | |
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| 528 | return new ByteArrayInputStream(byteArray); |
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| 529 | }*/ |
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| 530 | |
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| 531 | /** |
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| 532 | * <p> |
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| 533 | * convenience method for dumping an object to std out. If the object is a JSON object, it is |
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| 534 | * deeply analyzed and its internal structure is dumped as well. |
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| 535 | * </p> |
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| 536 | * |
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| 537 | * @param object the object to dump |
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| 538 | * @param indent the indentation to be used. |
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| 539 | */ |
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| 540 | private void dumpJSONObject(Object object, String indent) { |
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| 541 | if (object instanceof JSONArray) { |
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| 542 | boolean arrayContainsJSONObjects = false; |
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| 543 | for (Object arrayElem : (JSONArray) object) { |
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| 544 | if (arrayElem instanceof JSONObject) { |
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| 545 | arrayContainsJSONObjects = true; |
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| 546 | break; |
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| 547 | } |
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| 548 | } |
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| 549 | |
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| 550 | if (arrayContainsJSONObjects) { |
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| 551 | System.out.println(); |
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| 552 | System.out.print(indent); |
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| 553 | System.out.println('['); |
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| 554 | System.out.print(indent); |
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| 555 | System.out.print(' '); |
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| 556 | } |
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| 557 | else { |
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| 558 | System.out.print(' '); |
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| 559 | System.out.print('['); |
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| 560 | } |
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| 561 | |
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| 562 | int index = 0; |
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| 563 | for (Object arrayElem : (JSONArray) object) { |
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| 564 | if (index++ > 0) { |
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| 565 | System.out.print(","); |
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| 566 | if (arrayContainsJSONObjects) { |
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| 567 | System.out.println(); |
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| 568 | System.out.print(indent); |
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| 569 | } |
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| 570 | |
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| 571 | System.out.print(' '); |
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| 572 | } |
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| 573 | |
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| 574 | dumpJSONObject(arrayElem, indent + " "); |
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| 575 | } |
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| 576 | |
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| 577 | if (arrayContainsJSONObjects) { |
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| 578 | System.out.println(); |
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| 579 | System.out.print(indent); |
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| 580 | } |
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| 581 | |
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| 582 | System.out.print(']'); |
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| 583 | } |
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| 584 | else if (object instanceof JSONObject) { |
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| 585 | System.out.println(" {"); |
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| 586 | |
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| 587 | @SuppressWarnings("unchecked") |
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| 588 | Set<Map.Entry<?,?>> entrySet = ((JSONObject) object).entrySet(); |
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| 589 | |
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| 590 | int index = 0; |
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| 591 | for (Map.Entry<?,?> entry : entrySet) { |
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| 592 | if (index++ > 0) { |
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| 593 | System.out.println(","); |
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| 594 | } |
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| 595 | System.out.print(indent); |
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| 596 | System.out.print(" \""); |
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| 597 | System.out.print(entry.getKey()); |
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| 598 | System.out.print("\":"); |
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| 599 | dumpJSONObject(entry.getValue(), indent + " "); |
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| 600 | } |
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| 601 | |
---|
| 602 | System.out.println(); |
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| 603 | System.out.print(indent); |
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| 604 | System.out.print('}'); |
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| 605 | } |
---|
| 606 | else { |
---|
| 607 | System.out.print('"'); |
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| 608 | System.out.print(object); |
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| 609 | System.out.print('"'); |
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| 610 | } |
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| 611 | } |
---|
| 612 | |
---|
| 613 | } |
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