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 */
016package org.ini4j;
017
018import java.io.InputStream;
019
020import java.net.URI;
021import java.net.URL;
022
023import java.util.Properties;
024import java.util.prefs.Preferences;
025import java.util.prefs.PreferencesFactory;
026
027public class IniPreferencesFactory implements PreferencesFactory
028{
029    public static final String PROPERTIES = "ini4j.properties";
030    public static final String KEY_USER = "org.ini4j.prefs.user";
031    public static final String KEY_SYSTEM = "org.ini4j.prefs.system";
032    private Preferences _system;
033    private Preferences _user;
034
035    @Override public synchronized Preferences systemRoot()
036    {
037        if (_system == null)
038        {
039            _system = newIniPreferences(KEY_SYSTEM);
040        }
041
042        return _system;
043    }
044
045    @Override public synchronized Preferences userRoot()
046    {
047        if (_user == null)
048        {
049            _user = newIniPreferences(KEY_USER);
050        }
051
052        return _user;
053    }
054
055    String getIniLocation(String key)
056    {
057        String location = Config.getSystemProperty(key);
058
059        if (location == null)
060        {
061            try
062            {
063                Properties props = new Properties();
064
065                props.load(Thread.currentThread().getContextClassLoader().getResourceAsStream(PROPERTIES));
066                location = props.getProperty(key);
067            }
068            catch (Exception x)
069            {
070                assert true;
071            }
072        }
073
074        return location;
075    }
076
077    URL getResource(String location) throws IllegalArgumentException
078    {
079        try
080        {
081            URI uri = new URI(location);
082            URL url;
083
084            if (uri.getScheme() == null)
085            {
086                url = Thread.currentThread().getContextClassLoader().getResource(location);
087            }
088            else
089            {
090                url = uri.toURL();
091            }
092
093            return url;
094        }
095        catch (Exception x)
096        {
097            throw (IllegalArgumentException) new IllegalArgumentException().initCause(x);
098        }
099    }
100
101    InputStream getResourceAsStream(String location) throws IllegalArgumentException
102    {
103        try
104        {
105            return getResource(location).openStream();
106        }
107        catch (Exception x)
108        {
109            throw (IllegalArgumentException) new IllegalArgumentException().initCause(x);
110        }
111    }
112
113    Preferences newIniPreferences(String key)
114    {
115        Ini ini = new Ini();
116        String location = getIniLocation(key);
117
118        if (location != null)
119        {
120            try
121            {
122                ini.load(getResourceAsStream(location));
123            }
124            catch (Exception x)
125            {
126                throw (IllegalArgumentException) new IllegalArgumentException().initCause(x);
127            }
128        }
129
130        return new IniPreferences(ini);
131    }
132}