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Java API for handling configuration files in Windows .ini format. The library includes its own Map based API, Java Preferences API and Java Beans API for handling .ini files. Additionally, the library includes a feature rich (variable/macro substitution, multiply property values, etc) java.util.Properties replacement.

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/**
 * Copyright 2005,2009 Ivan SZKIBA
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.ini4j;

import java.io.File;
import java.io.FileWriter;

import java.util.prefs.BackingStoreException;

public class IniFile extends IniPreferences
{
    public static enum Mode
    {
        RO,
        WO,
        RW
    }

    private final File _file;
    private final Mode _mode;

    public IniFile(File file) throws BackingStoreException
    {
        this(file, Mode.RO);
    }

    public IniFile(File file, Mode mode) throws BackingStoreException
    {
        super(new Ini());
        _file = file;
        _mode = mode;
        if ((_mode == Mode.RO) || ((_mode != Mode.WO) && _file.exists()))
        {
            sync();
        }
    }

    public File getFile()
    {
        return _file;
    }

    public Mode getMode()
    {
        return _mode;
    }

    @Override public void flush() throws BackingStoreException
    {
        if (_mode == Mode.RO)
        {
            throw new BackingStoreException("read only instance");
        }

        try
        {
            synchronized (lock)
            {
                FileWriter writer = new FileWriter(_file);

                try
                {
                    getIni().store(writer);
                }
                finally
                {
                    writer.close();
                }
            }
        }
        catch (Exception x)
        {
            throw new BackingStoreException(x);
        }
    }

    @Override public void sync() throws BackingStoreException
    {
        if (_mode == Mode.WO)
        {
            throw new BackingStoreException("write only instance");
        }

        try
        {
            synchronized (lock)
            {
                getIni().load(_file.toURI().toURL());
            }
        }
        catch (Exception x)
        {
            throw new BackingStoreException(x);
        }
    }
}