[1069] | 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.htmlmonitor; |
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| 16 | |
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[1077] | 17 | import java.io.UnsupportedEncodingException; |
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[1069] | 18 | import java.security.MessageDigest; |
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[1077] | 19 | import java.security.NoSuchAlgorithmException; |
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[1069] | 20 | import java.util.HashMap; |
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| 21 | import java.util.LinkedList; |
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| 22 | import java.util.List; |
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| 23 | import java.util.Map; |
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| 24 | |
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| 25 | import org.apache.commons.codec.binary.Base64; |
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| 26 | |
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| 27 | /** |
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| 28 | * <p> |
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[1076] | 29 | * This class is used to calculate unique ids for GUI elements and to reuse GUI element objects. |
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| 30 | * For this it provides appropriate create methods. If there is already a GUI element for the |
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| 31 | * given parameters, it is reused. Otherwise, a new one is instantiated with a unique id and |
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| 32 | * returned. |
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[1069] | 33 | * </p> |
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| 34 | * |
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| 35 | * @author Patrick Harms |
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| 36 | */ |
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| 37 | class HtmlGUIElementManager { |
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| 38 | |
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[1076] | 39 | /** |
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| 40 | * an internal map for GUI elements and their respective ids. |
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| 41 | */ |
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[1069] | 42 | private Map<String, HtmlGUIElement> idMap = new HashMap<String, HtmlGUIElement>(); |
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| 43 | |
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| 44 | /** */ |
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| 45 | private Map<String, List<HtmlPageElement>> domPathMap = |
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| 46 | new HashMap<String, List<HtmlPageElement>>(); |
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| 47 | |
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| 48 | /** |
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| 49 | * <p> |
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[1076] | 50 | * creates a new or reuses an existing GUI element representing a server |
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[1069] | 51 | * </p> |
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[1076] | 52 | * |
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| 53 | * @param name the name of the server to represent (must not be null) |
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| 54 | * @param port the port on the server via which the communication is done |
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[1069] | 55 | * |
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[1076] | 56 | * @return a new or reuses an existing GUI element representing a server |
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[1069] | 57 | */ |
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| 58 | HtmlServer createHtmlServer(String name, int port) { |
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| 59 | if (name == null) { |
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| 60 | throw new IllegalArgumentException("name must not be null"); |
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| 61 | } |
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| 62 | |
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| 63 | String id = calculateId(name, Integer.toString(port)); |
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| 64 | |
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| 65 | HtmlGUIElement server = idMap.get(id); |
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| 66 | |
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| 67 | if (server == null) { |
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| 68 | server = new HtmlServer(id, name, port); |
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| 69 | idMap.put(id, server); |
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| 70 | } |
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| 71 | else if (!(server instanceof HtmlServer)) { |
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| 72 | throw new RuntimeException |
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| 73 | ("id conflict: calculated the same id for two different GUI elements"); |
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| 74 | } |
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| 75 | |
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| 76 | return (HtmlServer) server; |
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| 77 | } |
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| 78 | |
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| 79 | /** |
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| 80 | * <p> |
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[1076] | 81 | * creates a new or reuses an existing GUI element representing a document (web page) |
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[1069] | 82 | * </p> |
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[1076] | 83 | * |
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| 84 | * @param server the server on which the document resides (must not be null) |
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| 85 | * @param path the path of the document on the web server (every following the server spec |
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| 86 | * in the URL, must not be null) |
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| 87 | * @param query the query part of the URL pointing to the document |
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| 88 | * @param title the title of the document if available |
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[1069] | 89 | * |
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[1076] | 90 | * @return a new or reuses an existing GUI element representing a document |
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[1069] | 91 | */ |
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| 92 | HtmlDocument createHtmlDocument(HtmlServer server, String path, String query, String title) { |
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| 93 | if (server == null) { |
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| 94 | throw new IllegalArgumentException("server must not be null"); |
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| 95 | } |
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| 96 | if (path == null) { |
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| 97 | throw new IllegalArgumentException("path must not be null"); |
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| 98 | } |
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| 99 | |
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| 100 | String id = calculateId(server.getId(), path, query, title); |
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| 101 | |
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| 102 | HtmlGUIElement document = idMap.get(id); |
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| 103 | |
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| 104 | if (document == null) { |
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| 105 | document = new HtmlDocument(id, server, path, query, title); |
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| 106 | idMap.put(id, document); |
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| 107 | } |
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| 108 | else if (!(document instanceof HtmlDocument)) { |
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| 109 | throw new RuntimeException |
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| 110 | ("id conflict: calculated the same id for two different GUI elements"); |
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| 111 | } |
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| 112 | |
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| 113 | return (HtmlDocument) document; |
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| 114 | } |
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| 115 | |
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| 116 | /** |
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| 117 | * <p> |
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[1076] | 118 | * creates a new or reuses an existing GUI element representing an HTML tag in a document |
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[1069] | 119 | * </p> |
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[1076] | 120 | * |
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| 121 | * @param document the document to which the HTML tag belongs (must not be null) |
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| 122 | * @param parent the parent tag, if any |
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| 123 | * @param tagName the name of the HTML tag (must not be null) |
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| 124 | * @param htmlId the document wide unique id of the tag, if available |
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| 125 | * @param index if no HTML id is present, the index of the tag regarding all children in |
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| 126 | * the same parent having the same tag name. |
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[1069] | 127 | * |
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[1076] | 128 | * @return a new or reuses an existing GUI element representing an HTML tag |
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[1069] | 129 | */ |
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| 130 | HtmlPageElement createHtmlPageElement(HtmlDocument document, |
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| 131 | HtmlPageElement parent, |
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| 132 | String tagName, |
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| 133 | String htmlId, |
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| 134 | Integer index) |
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| 135 | { |
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| 136 | if (document == null) { |
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| 137 | throw new IllegalArgumentException("document must not be null"); |
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| 138 | } |
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| 139 | if (tagName == null) { |
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| 140 | throw new IllegalArgumentException("document must not be null"); |
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| 141 | } |
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| 142 | |
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| 143 | String id = calculateId |
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| 144 | (document.getId(), parent != null ? parent.getDOMPath() : null, tagName, htmlId, |
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| 145 | index != null ? index.toString() : "-1"); |
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| 146 | |
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| 147 | HtmlGUIElement pageElement = idMap.get(id); |
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| 148 | |
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| 149 | if (pageElement == null) { |
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| 150 | pageElement = new HtmlPageElement(id, document, parent, tagName, htmlId, index); |
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| 151 | idMap.put(id, pageElement); |
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| 152 | } |
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| 153 | else if (!(pageElement instanceof HtmlPageElement)) { |
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| 154 | throw new RuntimeException |
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| 155 | ("id conflict: calculated the same id for two different GUI elements"); |
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| 156 | } |
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| 157 | |
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| 158 | List<HtmlPageElement> candidates = |
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| 159 | domPathMap.get(((HtmlPageElement) pageElement).getDOMPath()); |
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| 160 | |
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| 161 | if (candidates == null) { |
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| 162 | candidates = new LinkedList<HtmlPageElement>(); |
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| 163 | domPathMap.put(((HtmlPageElement) pageElement).getDOMPath(), candidates); |
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| 164 | } |
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| 165 | |
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| 166 | if (!candidates.contains(pageElement)) { |
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| 167 | candidates.add((HtmlPageElement) pageElement); |
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| 168 | } |
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| 169 | |
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| 170 | return (HtmlPageElement) pageElement; |
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| 171 | } |
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| 172 | |
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| 173 | /** |
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| 174 | * <p> |
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[1076] | 175 | * determines the HTML tag belonging to the given document and residing in the document at the |
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| 176 | * location denoted by the path. The path must be equal to the return value of the |
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| 177 | * {@link HtmlPageElement#getDOMPath()} method. |
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[1069] | 178 | * </p> |
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| 179 | * |
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[1076] | 180 | * @param document the document to which the searched tag belongs |
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| 181 | * @param domPath the path through the DOM where the searched tag resists |
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| 182 | * |
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| 183 | * @return the appropriate HTML tag or null, if none is known |
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[1069] | 184 | */ |
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| 185 | HtmlPageElement getPageElement(HtmlDocument document, String domPath) { |
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| 186 | List<HtmlPageElement> candidates = domPathMap.get(domPath); |
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| 187 | |
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| 188 | if (candidates != null) { |
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| 189 | for (HtmlPageElement candidate : candidates) { |
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| 190 | if (document.equals(candidate.getDocument())) { |
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| 191 | return candidate; |
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| 192 | } |
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| 193 | } |
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| 194 | } |
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| 195 | |
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| 196 | return null; |
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| 197 | } |
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| 198 | |
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| 199 | /** |
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| 200 | * <p> |
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[1076] | 201 | * calculates a unique id for the given string fragments using SHA-512 and Base64 encoding. |
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[1069] | 202 | * </p> |
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| 203 | * |
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[1076] | 204 | * @param fragments strings to be used for calculating a unique id |
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| 205 | * |
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| 206 | * @return a Base64 encoded unique id for the provided fragments |
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[1069] | 207 | */ |
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| 208 | private String calculateId(String... fragments) { |
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| 209 | try { |
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| 210 | MessageDigest md = MessageDigest.getInstance("SHA-512"); |
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| 211 | |
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| 212 | for (String fragment : fragments) { |
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| 213 | if (fragment != null) { |
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[1075] | 214 | md.update(fragment.getBytes("UTF-8")); |
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[1069] | 215 | } |
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| 216 | } |
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| 217 | |
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| 218 | return Base64.encodeBase64String(md.digest()); |
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| 219 | } |
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[1077] | 220 | catch (UnsupportedEncodingException e) { |
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[1069] | 221 | throw new IllegalStateException("Java VM does not support this code"); |
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| 222 | } |
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[1077] | 223 | catch (NoSuchAlgorithmException e) { |
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| 224 | throw new IllegalStateException("Java VM does not support this code"); |
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| 225 | } |
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[1069] | 226 | } |
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| 227 | |
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| 228 | } |
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