root / trunk / libraries / libInternationalization / src / org / gvsig / i18n / Messages.java @ 4736
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package org.gvsig.i18n; |
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import java.io.*; |
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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.*; |
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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 Generalitat Valenciana and IVER Tecnolog?as de la Informaci?n S.A.
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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 = 1000; |
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private static Hashtable localeResources = new Hashtable(_INITIALSIZE, 2);; // contains the translations, indexed by key |
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private static Vector _preferredLocales = new Vector(); // contains the ordered list of prefered languages/locales (class Locale) |
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// private static Vector _availableLocales;
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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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String translation = (String) localeResources.get(key); |
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if (translation!=null) |
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return translation;
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logger.warn(callerName+Messages.getText("Messages._no_se_encontro_la_traduccion_para", 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, return the key and register
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* 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, 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) { |
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return getText(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, 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 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, boolean log) { |
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if (key==null) return null; |
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return (String) localeResources.get(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, 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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return (String) localeResources.get(key); |
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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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String currentKey;
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Enumeration properties;
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Enumeration languages = _preferredLocales.elements();
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if (languages.hasMoreElements() == false) { |
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// if it's empty, warn about that
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logger.warn("No hay lista de idiomas preferidos. ?Quiz? olvid? inicializar la clase?");
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} |
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Locale lang;
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ResourceBundle bundle = null; |
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while (languages.hasMoreElements()) { // for each language |
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try {
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lang = (Locale) languages.nextElement();
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bundle = ResourceBundle.getBundle(family, lang, loader);
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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 fallback 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 (!localeResources.containsKey(currentKey)) {
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localeResources.put(currentKey, bundle.getString(currentKey)); |
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} |
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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(_CLASSNAME+" MissingResourceException");
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//logger.warn(_CLASSNAME+" ", ex);
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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.
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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 PrivateClassLoader(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 PrivateClassLoader(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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Enumeration languages = _preferredLocales.elements();
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if (languages.hasMoreElements() == false) { |
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// if it's empty, warn about that
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logger.warn("No hay lista de idiomas preferidos. ?Quiz? olvid? inicializar la clase?");
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} |
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Locale lang;
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ResourceBundle bundle = null; |
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while (languages.hasMoreElements()) { // for each language |
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try {
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lang = (Locale) languages.nextElement();
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bundle = ResourceBundle.getBundle(family, lang, loader);
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if (bundle.getLocale().getLanguage().equals(lang.getLanguage()) || lang.getLanguage().equals("es")) { |
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// we ensure we didn't got a fallback
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// (except if lang == "es" -- spanish is the default language, so we accept a fallback 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 (!localeResources.containsKey(currentKey)) {
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localeResources.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);
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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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Enumeration languages = _preferredLocales.elements();
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if (languages.hasMoreElements() == false) { |
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// if it's empty, warn about that
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logger.warn("No hay lista de idiomas preferidos. ?Quiz? olvid? inicializar la clase?");
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} |
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Locale lang;
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ResourceBundle bundle = null; |
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while (languages.hasMoreElements()) { // for each language |
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try {
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lang = (Locale) languages.nextElement();
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bundle = ResourceBundle.getBundle(family, lang);
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if (bundle.getLocale().getLanguage()!=lang.getLanguage() && lang.getLanguage()!="es") { |
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// if we got a fallback, discard it (we'll try the next language first)
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// (except if lang == "es" -- spanish is the default language, so we accept a fallback for it
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bundle = null;
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} |
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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 (!localeResources.containsKey(currentKey)) {
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localeResources.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(callerName+" ", ex);
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} |
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} |
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} |
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/**
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* Returns a vector containing the ordered list of prefered Locales
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* Each element of the vector is a Locale object.
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*
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* @return a vector containing the ordered list of prefered Locales
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* Each element of the vector is a Locale object.
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*/
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public static Vector getPreferredLocales() { |
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return _preferredLocales;
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} |
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/**
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* Sets the ordered list of preferred locales.
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* Each element of the vector is a Locale object.
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*
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* @param preferredLocales a vector containing Locale objects.
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* The Vector represents an ordered list of preferred locales
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*/
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public static void setPreferredLocales(Vector preferredLocales) { |
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_preferredLocales = preferredLocales; |
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} |
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/**
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* Adds a Locale at the end of the ordered list of preferred locales.
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*
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* @param lang A Locale object specifying the locale to add
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*/
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public static void addLocale(Locale lang) { |
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if (_preferredLocales == null) { |
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_preferredLocales = new Vector(); |
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} |
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_preferredLocales.add(lang); |
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} |
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/**
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* Removes the specified Locale from the list of preferred locales.
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*
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* @param lang A Locale object specifying the locale to remove
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*/
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public static boolean removeLocale(Locale lang) { |
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return _preferredLocales.remove(lang);
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} |
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/**
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* Cleans the translation table (removes all the translations from memory).
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*
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* @param lang A Locale object specifying the locale to remove
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*/
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public static void removeResources() { |
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localeResources = new Hashtable(_INITIALSIZE, 2);; // contains the translations, indexed by key |
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} |
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|
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/**
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* The number of translation keys which have been loaded till now
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* (In other words: the number of available translation strings).
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*/
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protected static int size() { |
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return localeResources.size();
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} |
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/**
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* Searches the subdirectories of the provided directory, finding
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* all the translation files, and constructing a list of available translations.
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* It reports different country codes or variants, if available.
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* For example, if there is an en_US translation and an en_GB translation, both
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* locales will be present in the Vector.
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*
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* @return
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*/
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/**
|
| 430 |
*
|
| 431 |
* @return A Vector containing the available locales. Each element is a Locale object
|
| 432 |
*/
|
| 433 |
/*public static Vector getAvailableLocales() {
|
| 434 |
return _availableLocales;
|
| 435 |
}*/
|
| 436 |
|
| 437 |
/**
|
| 438 |
*
|
| 439 |
* @return A Vector containing the available languages. Each element is an String object
|
| 440 |
*/
|
| 441 |
/*public static Vector getAvailableLanguages() {
|
| 442 |
Vector availableLanguages = new Vector();
|
| 443 |
Locale lang;
|
| 444 |
Enumeration locales = _availableLocales.elements();
|
| 445 |
while (locales.hasMoreElements()) {
|
| 446 |
lang = (Locale) locales.nextElement();
|
| 447 |
availableLanguages.add(lang.getLanguage());
|
| 448 |
}
|
| 449 |
return availableLanguages;
|
| 450 |
}*/
|
| 451 |
} |
| 452 |
|
| 453 |
class PrivateClassLoader extends URLClassLoader { |
| 454 |
|
| 455 |
public PrivateClassLoader(URL[] urls) { |
| 456 |
super(urls);
|
| 457 |
} |
| 458 |
|
| 459 |
public URL getResource(String res) { |
| 460 |
try {
|
| 461 |
ArrayList resource = new ArrayList(); |
| 462 |
StringTokenizer st = new StringTokenizer(res, "\\/"); |
| 463 |
|
| 464 |
while (st.hasMoreTokens()) {
|
| 465 |
String token = st.nextToken();
|
| 466 |
resource.add(token); |
| 467 |
} |
| 468 |
URL ret = null; |
| 469 |
int currentUrl;
|
| 470 |
URL[] urls = getURLs(); |
| 471 |
|
| 472 |
for (currentUrl=0; currentUrl< urls.length; currentUrl++) { |
| 473 |
URL url = urls[currentUrl];
|
| 474 |
File file = new File(url.getFile()); |
| 475 |
if (url.getFile().endsWith("/")) |
| 476 |
ret = getResource(file, resource); |
| 477 |
} |
| 478 |
|
| 479 |
if (ret != null) { |
| 480 |
return ret;
|
| 481 |
} |
| 482 |
} catch (Exception e) { |
| 483 |
e.printStackTrace(); |
| 484 |
} |
| 485 |
|
| 486 |
return super.getResource(res); |
| 487 |
} |
| 488 |
|
| 489 |
/**
|
| 490 |
* Busca recursivamente el recurso res en el directorio base. res es una
|
| 491 |
* lista de String's con los directorios del path y base es el directorio
|
| 492 |
* a partir del cual se busca dicho recurso. En cada ejecuci?n del m?todo
|
| 493 |
* se toma el primer elemento de res y se busca dicho directorio en el
|
| 494 |
* directorio base. Si se encuentra, ser? el directorio base para una
|
| 495 |
* nueva llamada.
|
| 496 |
*
|
| 497 |
* @param base Directorio desde donde parte la b?squeda del recurso.
|
| 498 |
* @param res Lista de strings con el path del recurso que se quiere
|
| 499 |
* encontrar
|
| 500 |
*
|
| 501 |
* @return URL con el recurso
|
| 502 |
*/
|
| 503 |
private URL getResource(File base, List res) { |
| 504 |
File[] files = base.listFiles(); |
| 505 |
|
| 506 |
String parte = (String) res.get(0); |
| 507 |
|
| 508 |
for (int i = 0; i < files.length; i++) { |
| 509 |
if (files[i].getName().compareTo(parte) == 0) { |
| 510 |
if (res.size() == 1) { |
| 511 |
try {
|
| 512 |
return new URL("file:" + files[i].toString()); |
| 513 |
} catch (MalformedURLException e) { |
| 514 |
return null; |
| 515 |
} |
| 516 |
} else {
|
| 517 |
return getResource(files[i], res.subList(1, res.size())); |
| 518 |
} |
| 519 |
} |
| 520 |
} |
| 521 |
|
| 522 |
return null; |
| 523 |
} |
| 524 |
} |
| 525 |
|