source: trunk/quest-jfcmonitor/src/main/java/de/ugoe/cs/quest/jfcmonitor/JFCNameChangeListener.java @ 853

/**
 * 
 */
package de.ugoe.cs.quest.jfcmonitor;

import java.awt.Component;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.accessibility.AccessibleContext;

import de.ugoe.cs.util.StringTools;

/**
 * <p>
 * Listener that listens on the name change of a component.     
 * </p>
 * @author Fabian Glaser
 * @version 1.0
 */
public class JFCNameChangeListener implements PropertyChangeListener {
         /**
     * <p>
     * Writer for logging events.
     * </p>
     */
    final private JFCMonitorOutputWriter outputWriter;
    
    /**
     * <p>
     * Constructor. Creates a new JFCNameChangeListener with a given 
     * {@link JFCMonitorOutputWriter}   
     * </p>
     * @param outputWriter
     */
    public JFCNameChangeListener(JFCMonitorOutputWriter outputWriter){
        this.outputWriter = outputWriter;
    }
        
        @Override
        public void propertyChange(PropertyChangeEvent evt) {
                if (evt.getPropertyName().equals("AccessibleName")){
                        AccessibleContext context = (AccessibleContext) evt.getSource();
                        Component component = (Component) context.getAccessibleParent();
                        StringBuilder builder = new StringBuilder();
                        builder.append("<componentNameChange hash=\"");
                        if (!JFCComponent.isKnown(component)){
                                        System.err.println("Referenced component is not known");
                                        throw new AssertionError("Referenced component is not known.");
                        }
                        builder.append(Integer.toHexString(component.hashCode()));
                        builder.append("\" newName=\"" + evt.getNewValue());
                        builder.append("\"/>" + StringTools.ENDLINE);
                        outputWriter.write(builder.toString());
                }               
        }
        
}