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 java.io.File;
019    import java.io.FileWriter;
020    
021    import java.util.prefs.BackingStoreException;
022    
023    public class IniFile extends IniPreferences
024    {
025        public static enum Mode
026        {
027            RO,
028            WO,
029            RW
030        }
031    
032        private final File _file;
033        private final Mode _mode;
034    
035        public IniFile(File file) throws BackingStoreException
036        {
037            this(file, Mode.RO);
038        }
039    
040        public IniFile(File file, Mode mode) throws BackingStoreException
041        {
042            super(new Ini());
043            _file = file;
044            _mode = mode;
045            if ((_mode == Mode.RO) || ((_mode != Mode.WO) && _file.exists()))
046            {
047                sync();
048            }
049        }
050    
051        public File getFile()
052        {
053            return _file;
054        }
055    
056        public Mode getMode()
057        {
058            return _mode;
059        }
060    
061        @Override public void flush() throws BackingStoreException
062        {
063            if (_mode == Mode.RO)
064            {
065                throw new BackingStoreException("read only instance");
066            }
067    
068            try
069            {
070                synchronized (lock)
071                {
072                    FileWriter writer = new FileWriter(_file);
073    
074                    try
075                    {
076                        getIni().store(writer);
077                    }
078                    finally
079                    {
080                        writer.close();
081                    }
082                }
083            }
084            catch (Exception x)
085            {
086                throw new BackingStoreException(x);
087            }
088        }
089    
090        @Override public void sync() throws BackingStoreException
091        {
092            if (_mode == Mode.WO)
093            {
094                throw new BackingStoreException("write only instance");
095            }
096    
097            try
098            {
099                synchronized (lock)
100                {
101                    getIni().load(_file.toURI().toURL());
102                }
103            }
104            catch (Exception x)
105            {
106                throw new BackingStoreException(x);
107            }
108        }
109    }