source: trunk/JFCMonitor/src/de/ugoe/cs/eventbench/jfcmonitor/JFCListener.java @ 355

package de.ugoe.cs.eventbench.jfcmonitor;

import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.event.AWTEventListener;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.io.IOException;
import java.io.OutputStreamWriter;

import de.ugoe.cs.util.StringTools;

/**
 * <p>
 * This class implements monitoring of AWT and Swing mouse and keyboard events.
 * Each of the events is written to an output stream.
 * </p>
 * 
 * @author Steffen Herbold
 * @version 1.0
 */
public class JFCListener implements AWTEventListener {

        /**
         * <p>
         * Convenience variable.
         * </p>
         */
        final static private String ENDLINE = System.getProperty("line.separator");

        /**
         * <p>
         * Writer for logging events.
         * </p>
         */
        final private OutputStreamWriter outputWriter;

        /**
         * <p>
         * Constructor. Creates a new JFCListener with a given
         * {@link OutputStreamWriter}, where the monitored information is logged.
         * </p>
         * 
         * @param outputWriter
         *            writer for the logged information
         */
        public JFCListener(OutputStreamWriter outputWriter) {
                this.outputWriter = outputWriter;
                try {
                        outputWriter.write("<?xml version=\"1.0\" encoding=\"UTF-16\"?>"
                                        + ENDLINE);
                        outputWriter.write("<sessions>" + ENDLINE);
                } catch (IOException e) {
                        System.err.println("JFCMONITOR -- Failure writing to log: "
                                        + e.getMessage());
                }
        }

        /**
         * <p>
         * Writes all received {@link MouseEvent}s and {@link KeyEvent}s to the
         * {@link #outputWriter}.
         * </p>
         * 
         * @see java.awt.event.AWTEventListener#eventDispatched(java.awt.AWTEvent)
         */
        @Override
        public void eventDispatched(AWTEvent event) {
                StringBuilder builder = new StringBuilder();

                if (event instanceof MouseEvent) {
                        MouseEvent mouseEvent = (MouseEvent) event;
                        if (!isMouseMovement(event.getID())) {
                                builder.append("<event id=\"" + event.getID() + "\">" + ENDLINE);
                                builder.append(" <param name=\"X\" value=\""
                                                + mouseEvent.getX() + "\" />" + ENDLINE);
                                builder.append(" <param name=\"Y\" value=\""
                                                + mouseEvent.getY() + "\" />" + ENDLINE);
                                builder.append(" <param name=\"Button\" value=\""
                                                + mouseEvent.getButton() + "\" />" + ENDLINE);
                                builder.append(" <param name=\"Modifiers\" value=\""
                                                + mouseEvent.getModifiers() + "\" />" + ENDLINE);
                                addSourceInfo(builder, event);
                                builder.append("</event>" + ENDLINE);
                        }
                }
                if (event instanceof KeyEvent) {
                        KeyEvent keyEvent = (KeyEvent) event;
                        if (keyEvent.getID() == KeyEvent.KEY_TYPED) {
                                builder.append("<event id=\"" + event.getID() + "\">" + ENDLINE);
                                builder.append(" <param name=\"KeyCode\" value=\""
                                                + keyEvent.getKeyCode() + "\" />" + ENDLINE);
                                builder.append(" <param name=\"Modifiers\" value=\""
                                                + keyEvent.getModifiers() + "\" />" + ENDLINE);
                                addSourceInfo(builder, event);
                                builder.append("</event>" + ENDLINE);
                        }
                }
                if (builder.length() > 0 && outputWriter != null) {
                        try {
                                outputWriter.write(builder.toString());
                                outputWriter.flush();
                        } catch (IOException e) {
                                System.err.println("JFCMONITOR -- Failure writing to log: "
                                                + e.getMessage());
                        }
                }
        }

        /**
         * <p>
         * Appends information about the event to a {@link StringBuilder}.
         * </p>
         * 
         * @param builder
         *            {@link StringBuilder} where the information is appended
         * @param event
         *            event whose information is appended
         */
        private void addSourceInfo(StringBuilder builder, AWTEvent event) {
                builder.append(" <source>" + ENDLINE);
                builder.append("  <param name=\"toString\" value=\""
                                + StringTools
                                                .xmlEntityReplacement(event.getSource().toString())
                                + "\" />" + ENDLINE);
                if (event.getSource() instanceof Component) {
                        Component source = (Component) event.getSource();
                        JFCComponent jfcComponent = JFCComponent.find(source);
                        if (jfcComponent != null) {
                                builder.append(jfcComponent.getXML());
                        }
                }
                builder.append(" </source>" + ENDLINE);
        }

        /**
         * <p>
         * Checks if the Id of an {@link AWTEvent} is a mouse movement Id.
         * </p>
         * 
         * @param eventId
         *            id of the {@link AWTEvent}
         * @return true, if the event is a mouse movement event; false otherwise
         */
        private boolean isMouseMovement(int eventId) {
                return eventId == MouseEvent.MOUSE_MOVED
                                || eventId == MouseEvent.MOUSE_DRAGGED
                                || eventId == MouseEvent.MOUSE_ENTERED
                                || eventId == MouseEvent.MOUSE_EXITED;
        }

}