001    /*
002     * Copyright 2005,2009 Ivan SZKIBA
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.ini4j.sample;
017    
018    //<editor-fold defaultstate="collapsed" desc="apt documentation">
019    //|
020    //|                             --------------
021    //|                             ListenerSample
022    //|
023    //|ListenerSample
024    //|
025    //| This advanced sample presents the event-controlled usage. The \[ini4j\]
026    //| library fully supports the events defined in Preferences API.
027    //|
028    //| This sample program expect the .ini file as a command line argument.
029    //| If there is no such argument, it use the {{{dwarfs.ini.html}dwarfs.ini}} file.
030    //|
031    //</editor-fold>
032    //{
033    import org.ini4j.IniPreferences;
034    
035    import java.io.FileInputStream;
036    
037    import java.util.prefs.*;
038    
039    public class ListenerSample
040    {
041        public static final String FILENAME = "dwarfs.ini";
042    
043        public static void main(String[] args) throws Exception
044        {
045            String filename = (args.length > 0) ? args[0] : FILENAME;
046            Preferences prefs = new IniPreferences(new FileInputStream(filename));
047            Listener listener = new Listener();
048    
049            prefs.addNodeChangeListener(listener);
050            Preferences jerry = prefs.node("jerry");
051    
052            jerry.addPreferenceChangeListener(listener);
053            jerry.put("color", "blue");
054            jerry.put("color", "gray");
055            jerry.putInt("age", 2);
056        }
057    
058        static class Listener implements NodeChangeListener, PreferenceChangeListener
059        {
060            public void childAdded(NodeChangeEvent event)
061            {
062                System.out.println("node added: " + event.getChild().name());
063            }
064    
065            public void childRemoved(NodeChangeEvent event)
066            {
067                System.out.println("node removed: " + event.getChild().name());
068            }
069    
070            public void preferenceChange(PreferenceChangeEvent event)
071            {
072                System.out.println("preference changed: " + event.getKey() + " = " + event.getNewValue());
073            }
074        }
075    }
076    //}