svn-gvsig-desktop / tags / v10_RC2c / libraries / libInternationalization / src / org / gvsig / i18n / Messages.java @ 8745
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2006 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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package org.gvsig.i18n; |
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import java.io.File; |
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import java.net.MalformedURLException; |
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import java.net.URL; |
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import java.net.URLClassLoader; |
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import java.util.ArrayList; |
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import java.util.Enumeration; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Locale; |
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import java.util.MissingResourceException; |
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import java.util.ResourceBundle; |
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import java.util.StringTokenizer; |
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import org.apache.log4j.Logger; |
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/**
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* <p>This class offers some methods to provide internationalization services
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* to other projects. All the methods are static.</p>
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*
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* <p>The most useful method is {@link #getText(String) getText(key)} (and family),
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* which returns the translation associated
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* with the provided key. The class must be initialized before getText can be
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* used.</p>
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*
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* <p>The typical usage sequence would be:</p>
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* <ul>
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* <li>Add some locale to the prefered locales list: <code>Messages.addLocale(new Locale("es"))</code></li>
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* <li>Add some resource file containing translations: <code>Messages.addResourceFamily("text", new File("."))</code></li>
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* <li>And finaly getText can be used: <code>Messages.getText("aceptar")</code></li>
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* </ul>
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*
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* <p>The resource files are Java properties files, which contain <code>key=translation</code>
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* pairs, one
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* pair per line. These files must be encoded using iso-8859-1 encoding, and unicode escaped
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* sequences must be used to include characters outside the former encoding.
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* There are several ways to specify the property file to load, see the different
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* addResourceFamily methods for details.</p>
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*
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* @author Cesar Martinez Izquierdo (cesar.martinez@iver.es)
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*
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*/
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public class Messages { |
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private static Logger logger = Logger.getLogger("Messages"); |
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private static String _CLASSNAME = "org.gvsig.i18n.Messages"; |
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private static int _INITIALSIZE = 3700; // I try to set an initial capacity similar to the amount of strings in gvSIG |
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/* Each entry will contain a hashmap with translations. Each hasmap
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* contains the translations for one language, indexed by the
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* translation key. The translations for language (i) in the preferred locales
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* list are contained in the position (i) of the localeResources list */
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private static ArrayList localeResources = new ArrayList(); |
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private static ArrayList preferredLocales = new ArrayList(); // contains the ordered list of prefered languages/locales (class Locale) |
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/**
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* <p>Gets the localized message associated with the provided key.
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* If the key is not in the dictionary, return the key and register
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* the failure in the log.</p>
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*
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* <p>The <code>callerName</code> parameter is only
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* used as a label when logging, so any String can be used. However, a
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* meaningful String should be used, such as the name of the class requiring
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* the translation services, in order to identify the source of the failure
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* in the log.</p>
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*
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* @param key An String which identifies the translation that we want to get.
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* @param callerName A symbolic name given to the caller of this method, to
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* show it in the log if the key was not found
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* @return an String with the message associated with the provided key.
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* If the key is not in the dictionary, return the key. If the key
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* is null, return null.
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*/
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public static String getText(String key, String callerName) { |
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if (key==null) return null; |
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for (int numLocale=0; numLocale<localeResources.size(); numLocale++) { |
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// try to get the translation for any of the languagues in the preferred languages list
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String translation = (String) ((HashMap)localeResources.get(numLocale)).get(key); |
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if (translation!=null && !translation.equals("")) |
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return translation;
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} |
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logger.warn(callerName+" "+Messages.getText("Messages._no_se_encontro_la_traduccion_para", _CLASSNAME ,false)+" "+key); |
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return key;
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} |
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/**
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* <p>Gets the localized message associated with the provided key.
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* If the key is not in the dictionary or the translation is empty,
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* return the key and register the failure in the log.</p>
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*
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* @param key An String which identifies the translation that we want to get.
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* @return an String with the message associated with the provided key.
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* If the key is not in the dictionary or the translation is empty,
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* return the key. If the key is null, return null.
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*/
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public static String getText(String key) { |
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return getText(key, _CLASSNAME);
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} |
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/**
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* <p>Gets the localized message associated with the provided key.
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* If the key is not in the dictionary or the translation is empty,
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* it returns null and the failure is only registered in the log if
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* the param log is true.</p>
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*
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* @param key An String which identifies the translation that we want
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* to get.
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* @param log Determines whether log a key failure or not
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* @return an String with the message associated with the provided key,
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* or null if the key is not in the dictionary or the
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* translation is empty.
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*/
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public static String getText(String key, boolean log) { |
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return getText(key, _CLASSNAME, log);
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} |
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/**
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* <p>Gets the localized message associated with the provided key.
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* If the key is not in the dictionary, it returns null and the failure
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* is only registered in the log if the param log is true.</p>
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*
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* @param key An String which identifies the translation that we want to get.
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* @param callerName A symbolic name given to the caller of this method, to
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* show it in the log if the key was not found
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* @param log Determines whether log a key failure or not
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* @return an String with the message associated with the provided key,
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* or null if the key is not in the dictionary.
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*/
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public static String getText(String key, String callerName, boolean log) { |
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if (key==null) return null; |
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for (int numLocale=0; numLocale<localeResources.size(); numLocale++) { |
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// try to get the translation for any of the languagues in the preferred languages list
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String translation = (String) ((HashMap)localeResources.get(numLocale)).get(key); |
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if (translation!=null && !translation.equals("")) |
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return translation;
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} |
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if (log) {
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logger.warn(callerName+" "+Messages.getText("Messages._no_se_encontro_la_traduccion_para", _CLASSNAME ,false)+" "+key); |
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} |
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return null; |
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} |
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/**
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* <p>Adds an additional family of resource files containing some translations.
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* A family is a group of files with a common baseName.
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* The file must be an iso-8859-1 encoded file, which can contain any unicode
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* character using unicode escaped sequences, and following the syntax:
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* <code>key1=value1
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* key2=value2</code>
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* where 'key1' is the key used to identify the string and must not
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* contain the '=' symbol, and 'value1' is the associated translation.</p>
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* <p<For example:</p>
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* <code>cancel=Cancelar
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* accept=Aceptar</code>
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* <p>Only one pair key-value is allowed per line.</p>
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*
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* <p>The actual name of the resource file to load is determined using the rules
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* explained in the class java.util.ResourceBundle. Summarizing, for each language
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* in the specified preferred locales list it will try to load a file with
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* the following structure: <code>family_locale.properties</code></p>
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*
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* <p>For example, if the preferred locales list contains {"fr", "es", "en"}, and
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* the family name is "text", it will try to load the files "text_fr.properties",
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* "text_es.properties" and finally "text_en.properties".</p>
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*
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* <p>Locales might be more specific, such us "es_AR" (meaning Spanish from Argentina)
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* or "es_AR_linux" (meaning Linux system preferring Spanish from Argentina). In the
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* later case, it will try to load "text_es_AR_linux.properties", then
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* "text_es_AR.properties" if the former fails, and finally "text_es.properties".</p>
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*
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* <p>The directory used to locate the resource file is determining by using the
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* getResource method from the provided ClassLoader.</p>
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*
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* @param family The family name (or base name) which is used to search
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* actual properties files.
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* @param loader A ClassLoader which is able to find a property file matching
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* the specified family name and the preferred locales
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* @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/ResourceBundle.html">ResourceBundle</a>
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*/
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public static void addResourceFamily(String family, ClassLoader loader) { |
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addResourceFamily(family, loader, "");
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} |
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/**
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* <p>Adds an additional family of resource files containing some translations.
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* The search path to locate the files is provided by the dirList parameter.</p>
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*
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* <p>See {@link addResourceFamily(String, ClassLoader)} for a discussion about the
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* format of the property files and the way to determine the candidat files
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* to load. Note that those methods are different in the way to locate the
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* candidat files. This method searches in the provided paths (<code>dirList</code>
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* parameter), while the referred method searches using the getResource method
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* of the provided ClassLoader.</p>
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*
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* @param family The family name (or base name) which is used to search
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* actual properties files.
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* @param dirList A list of search paths to locate the property files
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* @throws MalformedURLException
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* @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/ResourceBundle.html">ResourceBundle</a>
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*/
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public static void addResourceFamily(String family, File[] dirList) throws MalformedURLException{ |
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// use our own classloader
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URL[] urls = new URL[dirList.length]; |
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int i;
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for (i=0; i<urls.length; i++) { |
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urls[i] = dirList[i].toURL(); |
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} |
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ClassLoader loader = new MessagesClassLoader(urls); |
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addResourceFamily(family, loader, "");
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} |
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/**
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* <p>Adds an additional family of resource files containing some translations.
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* The search path to locate the files is provided by the dir parameter.</p>
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*
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* <p>See {@link addResourceFamily(String, ClassLoader)} for a discussion about the
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* format of the property files and the way to determine the candidat files
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* to load. Note that those methods are different in the way to locate the
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* candidat files. This method searches in the provided path (<code>dir</code>
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* parameter), while the referred method searches using the getResource method
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* of the provided ClassLoader.</p>
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*
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* @param family The family name (or base name) which is used to search
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* actual properties files.
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* @param dir The search path to locate the property files
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* @throws MalformedURLException
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* @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/ResourceBundle.html">ResourceBundle</a>
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*/
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public static void addResourceFamily(String family, File dir) throws MalformedURLException{ |
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// use our own classloader
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URL[] urls = new URL[1]; |
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urls[0] = dir.toURL();
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ClassLoader loader = new MessagesClassLoader(urls); |
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addResourceFamily(family, loader, "");
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} |
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/**
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* <p>Adds an additional family of resource files containing some translations.
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* The search path is determined by the getResource method from the
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* provided ClassLoader.</p>
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*
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* <p>This method is identical to {@link addResourceFamily(String, ClassLoader)},
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* except that it adds a <pode>callerName</code> parameter to show in the log.</p>
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*
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* <p>See {@link addResourceFamily(String, ClassLoader)} for a discussion about the
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* format of the property files andthe way to determine the candidat files
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* to load.</p>
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*
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* @param family The family name (or base name) which is used to search
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* actual properties files.
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* @param loader A ClassLoader which is able to find a property file matching
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* the specified family name and the preferred locales
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* @param callerName A symbolic name given to the caller of this method, to
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* show it in the log if there is an error
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* @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/ResourceBundle.html">ResourceBundle</a>
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*/
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public static void addResourceFamily(String family, ClassLoader loader, String callerName) { |
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String currentKey;
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Enumeration properties;
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int totalLocales = preferredLocales.size();
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if (totalLocales == 0) { |
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// if it's empty, warn about that
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logger.warn(Messages.getText("Messages.no.hay.lista.de.idiomas.preferidos.quiza.olvido.inicializar.clase", _CLASSNAME, false)); |
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} |
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Locale lang;
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ResourceBundle bundle = null; |
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for (int numLocale=0; numLocale<totalLocales; numLocale++) { // for each language |
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lang = (Locale) preferredLocales.get(numLocale);
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try {
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/**
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* Here we are doing a pervert use of getBundle method. Normally, it is call it in in this way:
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* getBundle("text", "en", loader), in order to get the file 'text_en.properties'. However, in
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* this way the default file ('text.properties') is also loaded, and we want to avoid this
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* (because 'text.properties contains the Spanish translation).
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* So we use the method in this non-standard way:
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* getBundle("text_en", "en", loader), ensuring that we are just loading the file 'text_en.properties'
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**/
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if (!lang.getLanguage().equals("es")) |
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bundle = ResourceBundle.getBundle(family+"_"+lang.getLanguage(), lang, loader); |
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else // we allow 'text.properties' to be loaded for Spanish |
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bundle = ResourceBundle.getBundle(family, lang, loader);
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properties = bundle.getKeys(); |
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while (properties.hasMoreElements()) {
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currentKey = (String) properties.nextElement();
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if (! ((HashMap)localeResources.get(numLocale)).containsKey(currentKey)) { |
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((HashMap)localeResources.get(numLocale)).put(currentKey, bundle.getString(currentKey));
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} |
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} |
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} |
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catch (MissingResourceException ex) { |
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logger.warn(Messages.getText("Messages.las_traducciones_no_pudieron_ser_cargadas", false)+" -- "+callerName+" -- "+lang.getLanguage()); |
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} |
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} |
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} |
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|
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/**
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* <p>Adds an additional family of resource files containing some translations.</p>
|
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*
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* <p>This method is identical to {@link addResourceFamily(String, ClassLoader, String)},
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* except that it uses the caller's class loader.</p>
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*
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* <p>See {@link addResourceFamily(String, ClassLoader)} for a discussion about the
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* format of the property files and the way to determine the candidat files
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* to load.</p>
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*
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* @param family The family name (or base name) which is used to search
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* actual properties files.
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* @param callerName A symbolic name given to the caller of this method, to
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* show it in the log if there is an error. This is only used
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* to show
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* something meaningful in the log, so you can use any string
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* @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/ResourceBundle.html">ResourceBundle</a>
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*/
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public static void addResourceFamily(String family, String callerName) { |
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String currentKey;
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Enumeration properties;
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int totalLocales = preferredLocales.size();
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if (totalLocales == 0) { |
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// if it's empty, warn about that
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logger.warn(Messages.getText("Messages.no.hay.lista.de.idiomas.preferidos.quiza.olvido.inicializar.clase", _CLASSNAME, false)); |
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} |
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Locale lang;
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ResourceBundle bundle = null; |
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for (int numLocale=0; numLocale<totalLocales; numLocale++) { // for each language |
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try {
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lang = (Locale) preferredLocales.get(numLocale);
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if (!lang.getLanguage().equals("es")) |
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bundle = ResourceBundle.getBundle(family+"_"+lang.getLanguage(), lang); |
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else // we allow 'text.properties' to be loaded for Spanish |
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bundle = ResourceBundle.getBundle(family, lang);
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//bundle = ResourceBundle.getBundle(family, lang);
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//if (bundle.getLocale().getLanguage().equals(lang.getLanguage()) || lang.getLanguage().equals("es")) {
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// we ensure we didn't get a fallback
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// (except if lang == "es" -- spanish is the default language, so we accept a the main translation file for it)
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properties = bundle.getKeys(); |
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while (properties.hasMoreElements()) {
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currentKey = (String) properties.nextElement();
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if (! ((HashMap)localeResources.get(numLocale)).containsKey(currentKey)) { |
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((HashMap)localeResources.get(numLocale)).put(currentKey, bundle.getString(currentKey));
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} |
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} |
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//}
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/*else {
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logger.warn(Messages.getText("Messages.las_traducciones_no_pudieron_ser_cargadas", false)+" -- "+callerName+" -- "+lang.getLanguage());
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}*/
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} |
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catch (MissingResourceException ex) { |
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logger.warn(callerName+" " + ex.getLocalizedMessage());
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} |
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} |
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} |
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|
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/**
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* Returns an ArrayList containing the ordered list of prefered Locales
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* Each element of the ArrayList is a Locale object.
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*
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* @return an ArrayList containing the ordered list of prefered Locales
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* Each element of the ArrayList is a Locale object.
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*/
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public static ArrayList getPreferredLocales() { |
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return preferredLocales;
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} |
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/**
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* <p>Sets the ordered list of preferred locales.
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* Each element of the ArrayList is a Locale object.</p>
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*
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* <p>Note that calling this method does not load any translation, it just
|
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* adds the language to the preferred locales list, so this method must
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* be always called before the translations are loaded using
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* the addResourceFamily() methods.</p>
|
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*
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* @param preferredLocales an ArrayList containing Locale objects.
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* The ArrayList represents an ordered list of preferred locales
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*/
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public static void setPreferredLocales(ArrayList preferredLocalesList) { |
428 |
for (int numLocale=0; numLocale < preferredLocalesList.size(); numLocale++) { |
429 |
addLocale((Locale) preferredLocalesList.get(numLocale));
|
430 |
} |
431 |
} |
432 |
|
433 |
/**
|
434 |
* Adds a Locale at the end of the ordered list of preferred locales.
|
435 |
* Note that calling this method does not load any translation, it just
|
436 |
* adds the language to the preferred locales list, so this method must
|
437 |
* be always called before the translations are loaded using
|
438 |
* the addResourceFamily() methods.
|
439 |
*
|
440 |
* @param lang A Locale object specifying the locale to add
|
441 |
*/
|
442 |
public static void addLocale(Locale lang) { |
443 |
if (!preferredLocales.contains(lang)) { // avoid duplicates |
444 |
preferredLocales.add(lang); // add the lang to the ordered list of preferred locales
|
445 |
localeResources.add(new HashMap(_INITIALSIZE)); // add a hashmap which will contain the translation for this language |
446 |
} |
447 |
} |
448 |
|
449 |
/**
|
450 |
* Removes the specified Locale from the list of preferred locales and the
|
451 |
* translations associated with this locale.
|
452 |
*
|
453 |
* @param lang A Locale object specifying the locale to remove
|
454 |
* @return True if the locale was in the preferred locales list, false otherwise
|
455 |
*/
|
456 |
public static boolean removeLocale(Locale lang) { |
457 |
int numLocale = preferredLocales.indexOf(lang);
|
458 |
if (numLocale!=-1) { // we found the locale in the list |
459 |
try {
|
460 |
preferredLocales.remove(numLocale); |
461 |
localeResources.remove(numLocale); |
462 |
} |
463 |
catch (IndexOutOfBoundsException ex) { |
464 |
logger.warn(_CLASSNAME + "." + "removeLocale: " + ex.getLocalizedMessage()); |
465 |
} |
466 |
return true; |
467 |
} |
468 |
return false; |
469 |
} |
470 |
|
471 |
/**
|
472 |
* Cleans the translation tables (removes all the translations from memory).
|
473 |
*/
|
474 |
public static void removeResources() { |
475 |
for (int numLocale=0; numLocale<localeResources.size(); numLocale++) { |
476 |
((HashMap)localeResources.get(numLocale)).clear();
|
477 |
} |
478 |
} |
479 |
|
480 |
/**
|
481 |
* The number of translation keys which have been loaded till now
|
482 |
* (In other words: the number of available translation strings).
|
483 |
*
|
484 |
* @param lang The language for which we want to know the number of translation keys
|
485 |
* return The number of translation keys for the provided language.
|
486 |
*/
|
487 |
protected static int size(Locale lang) { |
488 |
int numLocale = preferredLocales.indexOf(lang);
|
489 |
if (numLocale!=-1) { |
490 |
return ((HashMap)localeResources.get(numLocale)).size(); |
491 |
}; |
492 |
return 0; |
493 |
} |
494 |
|
495 |
/**
|
496 |
* Checks if some locale has been added to the preferred locales
|
497 |
* list, which is necessary before loading any translation because
|
498 |
* only the translations for the preferred locales are loaded.
|
499 |
*
|
500 |
* @return
|
501 |
*/
|
502 |
public static boolean hasLocales() { |
503 |
return preferredLocales.size()>0; |
504 |
} |
505 |
|
506 |
/**
|
507 |
* Searches the subdirectories of the provided directory, finding
|
508 |
* all the translation files, and constructing a list of available translations.
|
509 |
* It reports different country codes or variants, if available.
|
510 |
* For example, if there is an en_US translation and an en_GB translation, both
|
511 |
* locales will be present in the Vector.
|
512 |
*
|
513 |
* @return
|
514 |
*/
|
515 |
|
516 |
/**
|
517 |
*
|
518 |
* @return A Vector containing the available locales. Each element is a Locale object
|
519 |
*/
|
520 |
/*public static Vector getAvailableLocales() {
|
521 |
return _availableLocales;
|
522 |
}*/
|
523 |
|
524 |
/**
|
525 |
*
|
526 |
* @return A Vector containing the available languages. Each element is an String object
|
527 |
*/
|
528 |
/*public static Vector getAvailableLanguages() {
|
529 |
Vector availableLanguages = new Vector();
|
530 |
Locale lang;
|
531 |
Enumeration locales = _availableLocales.elements();
|
532 |
while (locales.hasMoreElements()) {
|
533 |
lang = (Locale) locales.nextElement();
|
534 |
availableLanguages.add(lang.getLanguage());
|
535 |
}
|
536 |
return availableLanguages;
|
537 |
}*/
|
538 |
} |