com.liferay.portal.kernel.util.AggregateResourceBundle.java Source code

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Here is the source code for com.liferay.portal.kernel.util.AggregateResourceBundle.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.kernel.util;

import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import java.util.Set;

/**
 * @author Carlos Sierra Andrs
 */
public class AggregateResourceBundle extends ResourceBundle {

    public AggregateResourceBundle(ResourceBundle... resourceBundles) {
        _resourceBundles = resourceBundles;
    }

    @Override
    public boolean containsKey(String key) {
        if (key == null) {
            throw new NullPointerException();
        }

        for (ResourceBundle resourceBundle : _resourceBundles) {
            if (resourceBundle.containsKey(key)) {
                return true;
            }
        }

        return false;
    }

    @Override
    public Enumeration<String> getKeys() {
        return Collections.enumeration(handleKeySet());
    }

    @Override
    public Locale getLocale() {
        for (ResourceBundle resourceBundle : _resourceBundles) {
            Locale locale = resourceBundle.getLocale();

            if (locale != null) {
                return locale;
            }
        }

        return super.getLocale();
    }

    @Override
    protected Object handleGetObject(String key) {
        if (key == null) {
            throw new NullPointerException();
        }

        for (ResourceBundle resourceBundle : _resourceBundles) {
            if (!resourceBundle.containsKey(key)) {
                continue;
            }

            try {
                return resourceBundle.getObject(key);
            } catch (MissingResourceException mre) {
            }
        }

        return null;
    }

    @Override
    protected Set<String> handleKeySet() {
        if (_keys == null) {
            Set<String> keys = new HashSet<>();

            for (ResourceBundle resourceBundle : _resourceBundles) {
                keys.addAll(resourceBundle.keySet());
            }

            _keys = keys;
        }

        return _keys;
    }

    private volatile Set<String> _keys;
    private final ResourceBundle[] _resourceBundles;

}