ingo@100: /*
ingo@100:  * Copyright (c) 2010 by Intevation GmbH
ingo@100:  *
ingo@100:  * This program is free software under the LGPL (>=v2.1)
ingo@100:  * Read the file LGPL.txt coming with the software for details
ingo@100:  * or visit http://www.gnu.org/licenses/ if it does not exist.
ingo@100:  */
ingo@100: 
teichmann@475: package org.dive4elements.artifactdatabase;
sascha@48: 
teichmann@475: import org.dive4elements.artifacts.CallMeta;
teichmann@475: import org.dive4elements.artifacts.PreferredLocale;
sascha@48: 
sascha@93: import java.util.Locale;
sascha@93: 
sascha@48: /**
sascha@87:  * Default implementation of CallMeta. It provides a list of
sascha@87:  * preferred langauages and implements an intersection mechanism
sascha@87:  * to figure out the best matching language given a list of server
sascha@87:  * provided languages.
sascha@77:  * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
sascha@48:  */
sascha@48: public class DefaultCallMeta
sascha@48: implements   CallMeta
sascha@48: {
sascha@87:     /**
sascha@87:      * The list of preferred languages.
sascha@87:      */
sascha@48:     protected PreferredLocale [] languages;
sascha@48: 
sascha@87:     /**
sascha@87:      * Default constructor.
sascha@87:      */
sascha@48:     public DefaultCallMeta() {
sascha@48:     }
sascha@48: 
sascha@87:     /**
sascha@87:      * Creates new DefaultCallMeta with a given list of languages.
sascha@87:      * @param languages The list of preferred languages.
sascha@87:      */
sascha@48:     public DefaultCallMeta(PreferredLocale [] languages) {
sascha@51:         this.languages = languages;
sascha@48:     }
sascha@48: 
sascha@48:     public PreferredLocale [] getLanguages() {
sascha@48:         return languages;
sascha@48:     }
sascha@49: 
sascha@49:     public Locale getPreferredLocale(Locale [] locales) {
sascha@49:         if (locales == null || locales.length == 0) {
sascha@49:             return null;
sascha@49:         }
sascha@49: 
sascha@50:         Locale best    = null;
sascha@50:         float  quality = -Float.MAX_VALUE;
sascha@50: 
sascha@50:         for (int i = 0; i < locales.length; ++i) {
sascha@50:             Locale wish         = locales[i];
sascha@50:             String wishLanguage = wish.getLanguage();
sascha@50: 
sascha@50:             for (int j = 0; j < languages.length; ++j) {
sascha@50:                 PreferredLocale have        = languages[j];
sascha@50:                 Locale          haveLocale  = have.getLocale();
sascha@50:                 if (haveLocale.getLanguage().equals(wishLanguage)) {
sascha@50:                     float haveQuality = have.getQuality();
sascha@50:                     if (haveQuality > quality) {
sascha@50:                         quality = haveQuality;
sascha@50:                         best    = wish;
sascha@50:                     }
sascha@50:                     break; // Languages should not contain
sascha@50:                            // same locale twice.
sascha@50:                 }
sascha@50:             }
sascha@50:         }
sascha@50: 
sascha@50:         return best == null
sascha@50:             ? locales[0]
sascha@50:             : best;
sascha@49:     }
sascha@48: }
sascha@91: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :