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;
017    
018    import org.ini4j.spi.AbstractBeanInvocationHandler;
019    
020    import java.lang.reflect.Proxy;
021    
022    import java.util.prefs.Preferences;
023    
024    public final class PreferencesBean
025    {
026        private PreferencesBean()
027        {
028        }
029    
030        public static <T> T newInstance(Class<T> clazz, final Preferences prefs)
031        {
032            return clazz.cast(Proxy.newProxyInstance(clazz.getClassLoader(), new Class[] { clazz }, new Handler(prefs)));
033        }
034    
035        private static class Handler extends AbstractBeanInvocationHandler
036        {
037            private final Preferences _prefs;
038    
039            public Handler(Preferences prefs)
040            {
041                _prefs = prefs;
042            }
043    
044            @Override protected Object getPropertySpi(String property, Class<?> clazz)
045            {
046                return _prefs.get(property, null);
047            }
048    
049            @Override protected void setPropertySpi(String property, Object value, Class<?> clazz)
050            {
051                _prefs.put(property, value.toString());
052            }
053    
054            @Override protected boolean hasPropertySpi(String property)
055            {
056                return _prefs.get(property, null) != null;
057            }
058        }
059    }