de.xaniox.heavyspleef.core.i18n.I18NManager.java Source code

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Here is the source code for de.xaniox.heavyspleef.core.i18n.I18NManager.java

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/*
 * This file is part of HeavySpleef.
 * Copyright (c) 2014-2016 Matthias Werning
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package de.xaniox.heavyspleef.core.i18n;

import com.google.common.collect.Maps;
import org.apache.commons.lang.Validate;

import java.util.Locale;
import java.util.Map;

public class I18NManager {

    /* Simple object used for synchronization when initializing
     * the global instance of I18N */
    private static final Object initLock = new Object();
    private static I18NBuilder globalBuilder;
    private static I18N global;

    private Map<String, I18N> registered;

    /**
     * Returns the global I18N instance used for
     * retrieving internal messages of HeavySpleef
     * 
     * @return The global instance of I18N
     */
    public static I18N getGlobal() {
        synchronized (initLock) {
            if (global == null) {
                if (globalBuilder == null) {
                    throw new IllegalStateException("No global builder has been set for initializing");
                }

                global = globalBuilder.build();
            }
        }

        return global;
    }

    /**
     * Sets the {@link I18NBuilder} for initializing the
     * global I18N.<br><br>
     * 
     * This may throw an exception when there is already a builder set
     * 
     * @param builder The builder for initializing
     * @see #getGlobal()
     */
    public static void setGlobalBuilder(I18NBuilder builder) {
        if (globalBuilder != null) {
            throw new IllegalStateException("Global I18NBuilder has already been set");
        }

        I18NManager.globalBuilder = builder;
    }

    public I18NManager() {
        this.registered = Maps.newHashMap();
    }

    public void registerI18N(String name, I18N i18n) {
        Validate.isTrue(!registered.containsKey(name), "I18N instance already registered");

        i18n.setParent(global);
        registered.put(name, i18n);
    }

    public I18N registerI18N(String name, I18NBuilder builder) {
        I18N i18n = builder.build();
        registerI18N(name, i18n);

        return i18n;
    }

    public void unregisterI18N(String name) {
        Validate.isTrue(registered.containsKey(name), "I18N instance is not registered");

        registered.remove(name);
    }

    public I18N getI18N(String name) {
        return registered.get(name);
    }

    public void reloadAll(Locale locale) {
        if (global != null) {
            global.setLocale(locale);
            global.load();
        }

        for (I18N i18n : registered.values()) {
            i18n.setLocale(locale);
            i18n.load();
        }
    }

}