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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.InputStream;

import java.net.URI;
import java.net.URL;

import java.util.Properties;
import java.util.prefs.Preferences;
import java.util.prefs.PreferencesFactory;

public class IniPreferencesFactory implements PreferencesFactory
{
    public static final String PROPERTIES = "ini4j.properties";
    public static final String KEY_USER = "org.ini4j.prefs.user";
    public static final String KEY_SYSTEM = "org.ini4j.prefs.system";
    private Preferences _system;
    private Preferences _user;

    @Override public synchronized Preferences systemRoot()
    {
        if (_system == null)
        {
            _system = newIniPreferences(KEY_SYSTEM);
        }

        return _system;
    }

    @Override public synchronized Preferences userRoot()
    {
        if (_user == null)
        {
            _user = newIniPreferences(KEY_USER);
        }

        return _user;
    }

    String getIniLocation(String key)
    {
        String location = Config.getSystemProperty(key);

        if (location == null)
        {
            try
            {
                Properties props = new Properties();

                props.load(Thread.currentThread().getContextClassLoader().getResourceAsStream(PROPERTIES));
                location = props.getProperty(key);
            }
            catch (Exception x)
            {
                assert true;
            }
        }

        return location;
    }

    URL getResource(String location) throws IllegalArgumentException
    {
        try
        {
            URI uri = new URI(location);
            URL url;

            if (uri.getScheme() == null)
            {
                url = Thread.currentThread().getContextClassLoader().getResource(location);
            }
            else
            {
                url = uri.toURL();
            }

            return url;
        }
        catch (Exception x)
        {
            throw (IllegalArgumentException) new IllegalArgumentException().initCause(x);
        }
    }

    InputStream getResourceAsStream(String location) throws IllegalArgumentException
    {
        try
        {
            return getResource(location).openStream();
        }
        catch (Exception x)
        {
            throw (IllegalArgumentException) new IllegalArgumentException().initCause(x);
        }
    }

    Preferences newIniPreferences(String key)
    {
        Ini ini = new Ini();
        String location = getIniLocation(key);

        if (location != null)
        {
            try
            {
                ini.load(getResourceAsStream(location));
            }
            catch (Exception x)
            {
                throw (IllegalArgumentException) new IllegalArgumentException().initCause(x);
            }
        }

        return new IniPreferences(ini);
    }
}