de.highbyte_le.weberknecht.i18n.LocaleMatcher.java Source code

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Here is the source code for de.highbyte_le.weberknecht.i18n.LocaleMatcher.java

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/*
 * LocaleMatcher.java (weberknecht)
 *
 * Copyright 2013 Patrick Mairif.
 * The program is distributed under the terms of the Apache License (ALv2).
 *
 * tabstop=4, charset=UTF-8
 */
package de.highbyte_le.weberknecht.i18n;

import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.ResourceBundle;
import java.util.Vector;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * locale matching
 *
 * @author pmairif
 */
public class LocaleMatcher {

    //   /**
    //    * Logger for this class
    //    */
    //   private final Log log = LogFactory.getLog(LocaleMatcher.class);

    private ResourceBundle resourceBundle = null;

    private final List<Locale> locales;

    private final String bundleName;

    private Locale defaultLocale = Locale.getDefault();

    /**
     * @param bundleName
     *       the name of your localization bundle
     * @param locales
     *       the locales accepted by the user (usually from the 'Accept-Language' header, available via HttpServletRequest.getLocales())
     */
    public LocaleMatcher(String bundleName, List<Locale> locales) {
        this.bundleName = bundleName;
        this.locales = locales;
    }

    /**
     * @param bundleName
     *       the name of your localization bundle
     * @param locales
     *       the locales accepted by the user (usually from the 'Accept-Language' header, available via HttpServletRequest.getLocales())
     */
    public LocaleMatcher(String bundleName, Enumeration<Locale> locales) {
        this.bundleName = bundleName;

        this.locales = new Vector<Locale>();
        while (locales.hasMoreElements())
            this.locales.add(locales.nextElement());
    }

    public Locale findLocale() {
        return findResourceBundle().getLocale();
    }

    /**
     * @return the resourceBundle
     */
    public synchronized ResourceBundle findResourceBundle() {
        if (null == resourceBundle) {
            if (locales.size() > 0) {
                Locale firstLocale = locales.get(0);

                this.resourceBundle = ResourceBundle.getBundle(bundleName, firstLocale,
                        new ResourceBundleControl());
            }

            if (null == resourceBundle || "".equals(this.resourceBundle.getLocale().toString()))
                this.resourceBundle = ResourceBundle.getBundle(bundleName, defaultLocale,
                        new ResourceBundleControl());
        }

        return resourceBundle;
    }

    /**
     * @param defaultLocale the defaultLocale to set
     */
    public void setDefaultLocale(Locale defaultLocale) {
        this.defaultLocale = defaultLocale;
    }

    /**
     * @return the defaultLocale
     */
    public Locale getDefaultLocale() {
        return defaultLocale;
    }

    /**
     * @return the locales
     */
    protected List<Locale> getLocales() {
        return locales;
    }

    class ResourceBundleControl extends ResourceBundle.Control {
        private final Log log = LogFactory.getLog(ResourceBundleControl.class);

        /* (non-Javadoc)
         * @see java.util.ResourceBundle.Control#getFallbackLocale(java.lang.String, java.util.Locale)
         */
        @Override
        public Locale getFallbackLocale(String baseName, Locale locale) {
            Locale fallback = null;

            List<Locale> locales = getLocales();
            if (locales != null) {
                Iterator<Locale> it = locales.iterator();
                while (it.hasNext()) {
                    Locale next = it.next();
                    if (next.equals(locale) && it.hasNext()) {
                        fallback = it.next();
                        break;
                    }
                }
            }

            if (null != fallback && log.isDebugEnabled()) {
                log.debug("getFallbackLocale() - checking fallback locale " + fallback);
            }

            return fallback;
        }
    }
}