mirror of git://gcc.gnu.org/git/gcc.git
561 lines
20 KiB
Java
561 lines
20 KiB
Java
/* ResourceBundle -- aids in loading resource bundles
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Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.util;
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import java.lang.ref.Reference;
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import java.lang.ref.SoftReference;
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import java.io.InputStream;
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import java.io.IOException;
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import gnu.classpath.Configuration;
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/**
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* A resource bundle contains locale-specific data. If you need localized
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* data, you can load a resource bundle that matches the locale with
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* <code>getBundle</code>. Now you can get your object by calling
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* <code>getObject</code> or <code>getString</code> on that bundle.
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*
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* <p>When a bundle is demanded for a specific locale, the ResourceBundle
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* is searched in following order (<i>def. language<i> stands for the
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* two letter ISO language code of the default locale (see
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* <code>Locale.getDefault()</code>).
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*
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<pre>baseName_<i>language code</i>_<i>country code</i>_<i>variant</i>
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baseName_<i>language code</i>_<i>country code</i>
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baseName_<i>language code</i>
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baseName_<i>def. language</i>_<i>def. country</i>_<i>def. variant</i>
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baseName_<i>def. language</i>_<i>def. country</i>
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baseName_<i>def. language</i>
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baseName</pre>
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*
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* <p>A bundle is backed up by less specific bundles (omitting variant, country
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* or language). But it is not backed up by the default language locale.
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*
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* <p>If you provide a bundle for a given locale, say
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* <code>Bundle_en_UK_POSIX</code>, you must also provide a bundle for
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* all sub locales, ie. <code>Bundle_en_UK</code>, <code>Bundle_en</code>, and
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* <code>Bundle</code>.
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*
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* <p>When a bundle is searched, we look first for a class with the given
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* name, then for a file with <code>.properties</code> extension in the
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* classpath. The name must be a fully qualified classname (with dots as
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* path separators).
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*
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* <p>(Note: This implementation always backs up the class with a properties
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* file if that is existing, but you shouldn't rely on this, if you want to
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* be compatible to the standard JDK.)
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*
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* @author Jochen Hoenicke
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* @author Eric Blake (ebb9@email.byu.edu)
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* @see Locale
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* @see ListResourceBundle
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* @see PropertyResourceBundle
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* @since 1.1
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* @status updated to 1.4
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*/
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public abstract class ResourceBundle
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{
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/**
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* The parent bundle. This is consulted when you call getObject and there
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* is no such resource in the current bundle. This field may be null.
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*/
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protected ResourceBundle parent;
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/**
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* The locale of this resource bundle. You can read this with
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* <code>getLocale</code> and it is automatically set in
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* <code>getBundle</code>.
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*/
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private Locale locale;
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private static native ClassLoader getCallingClassLoader();
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/**
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* The resource bundle cache. This is a two-level hash map: The key
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* is the class loader, the value is a new HashMap. The key of this
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* second hash map is the localized name, the value is a soft
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* references to the resource bundle.
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*/
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private static Map resourceBundleCache;
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/**
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* The last default Locale we saw. If this ever changes then we have to
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* reset our caches.
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*/
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private static Locale lastDefaultLocale;
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/**
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* The `empty' locale is created once in order to optimize
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* tryBundle().
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*/
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private static final Locale emptyLocale = new Locale("");
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/**
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* The constructor. It does nothing special.
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*/
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public ResourceBundle()
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{
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}
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/**
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* Get a String from this resource bundle. Since most localized Objects
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* are Strings, this method provides a convenient way to get them without
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* casting.
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*
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* @param key the name of the resource
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* @throws MissingResourceException if the resource can't be found
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* @throws NullPointerException if key is null
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* @throws ClassCastException if resource is not a string
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*/
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public final String getString(String key)
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{
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return (String) getObject(key);
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}
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/**
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* Get an array of Strings from this resource bundle. This method
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* provides a convenient way to get it without casting.
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*
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* @param key the name of the resource
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* @throws MissingResourceException if the resource can't be found
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* @throws NullPointerException if key is null
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* @throws ClassCastException if resource is not a string
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*/
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public final String[] getStringArray(String key)
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{
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return (String[]) getObject(key);
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}
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/**
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* Get an object from this resource bundle. This will call
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* <code>handleGetObject</code> for this resource and all of its parents,
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* until it finds a non-null resource.
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*
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* @param key the name of the resource
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* @throws MissingResourceException if the resource can't be found
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* @throws NullPointerException if key is null
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*/
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public final Object getObject(String key)
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{
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for (ResourceBundle bundle = this; bundle != null; bundle = bundle.parent)
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try
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{
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Object o = bundle.handleGetObject(key);
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if (o != null)
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return o;
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}
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catch (MissingResourceException ex)
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{
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}
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throw new MissingResourceException("Key not found",
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getClass().getName(), key);
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}
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/**
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* Return the actual locale of this bundle. You can use it after calling
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* getBundle, to know if the bundle for the desired locale was loaded or
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* if the fall back was used.
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*
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* @return the bundle's locale
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*/
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public Locale getLocale()
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{
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return locale;
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}
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/**
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* Set the parent of this bundle. The parent is consulted when you call
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* getObject and there is no such resource in the current bundle.
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*
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* @param parent the parent of this bundle
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*/
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protected void setParent(ResourceBundle parent)
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{
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this.parent = parent;
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}
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/**
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* Get the appropriate ResourceBundle for the default locale. This is like
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* calling <code>getBundle(baseName, Locale.getDefault(),
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* getClass().getClassLoader()</code>, except that any security check of
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* getClassLoader won't fail.
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*
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* @param baseName the name of the ResourceBundle
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* @return the desired resource bundle
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* @throws MissingResourceException if the resource bundle can't be found
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* @throws NullPointerException if baseName is null
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*/
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public static final ResourceBundle getBundle(String baseName)
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{
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return getBundle(baseName, Locale.getDefault(),
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getCallingClassLoader());
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}
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/**
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* Get the appropriate ResourceBundle for the given locale. This is like
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* calling <code>getBundle(baseName, locale,
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* getClass().getClassLoader()</code>, except that any security check of
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* getClassLoader won't fail.
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*
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* @param baseName the name of the ResourceBundle
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* @param locale A locale
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* @return the desired resource bundle
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* @throws MissingResourceException if the resource bundle can't be found
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* @throws NullPointerException if baseName or locale is null
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*/
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public static final ResourceBundle getBundle(String baseName,
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Locale locale)
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{
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return getBundle(baseName, locale, getCallingClassLoader());
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}
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/**
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* Get the appropriate ResourceBundle for the given locale. The following
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* strategy is used:
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*
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* <p>A sequence of candidate bundle names are generated, and tested in
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* this order, where the suffix 1 means the string from the specified
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* locale, and the suffix 2 means the string from the default locale:<ul>
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* <li>baseName + "_" + language1 + "_" + country1 + "_" + variant1</li>
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* <li>baseName + "_" + language1 + "_" + country1</li>
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* <li>baseName + "_" + language1</li>
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* <li>baseName + "_" + language2 + "_" + country2 + "_" + variant2</li>
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* <li>baseName + "_" + language2 + "_" + country2</li>
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* <li>baseName + "_" + language2<li>
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* <li>baseName</li>
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* </ul>
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*
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* <p>In the sequence, entries with an empty string are ignored. Next,
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* <code>getBundle</code> tries to instantiate the resource bundle:<ul>
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* <li>First, an attempt is made to load a class in the specified classloader
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* which is a subclass of ResourceBundle, and which has a public constructor
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* with no arguments, via reflection.</li>
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* <li>Next, a search is made for a property resource file, by replacing
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* '.' with '/' and appending ".properties", and using
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* ClassLoader.getResource(). If a file is found, then a
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* PropertyResourceBundle is created from the file's contents.</li>
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* </ul>
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* If no resource bundle was found, a MissingResourceException is thrown.
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*
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* <p>Next, the parent chain is implemented. The remaining candidate names
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* in the above sequence are tested in a similar manner, and if any results
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* in a resource bundle, it is assigned as the parent of the first bundle
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* using the <code>setParent</code> method (unless the first bundle already
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* has a parent).
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*
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* <p>For example, suppose the following class and property files are
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* provided: MyResources.class, MyResources_fr_CH.properties,
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* MyResources_fr_CH.class, MyResources_fr.properties,
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* MyResources_en.properties, and MyResources_es_ES.class. The contents of
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* all files are valid (that is, public non-abstract subclasses of
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* ResourceBundle with public nullary constructors for the ".class" files,
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* syntactically correct ".properties" files). The default locale is
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* Locale("en", "UK").
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*
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* <p>Calling getBundle with the shown locale argument values instantiates
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* resource bundles from the following sources:<ul>
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* <li>Locale("fr", "CH"): result MyResources_fr_CH.class, parent
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* MyResources_fr.properties, parent MyResources.class</li>
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* <li>Locale("fr", "FR"): result MyResources_fr.properties, parent
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* MyResources.class</li>
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* <li>Locale("de", "DE"): result MyResources_en.properties, parent
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* MyResources.class</li>
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* <li>Locale("en", "US"): result MyResources_en.properties, parent
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* MyResources.class</li>
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* <li>Locale("es", "ES"): result MyResources_es_ES.class, parent
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* MyResources.class</li>
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* </ul>
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* The file MyResources_fr_CH.properties is never used because it is hidden
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* by MyResources_fr_CH.class.
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*
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* @param baseName the name of the ResourceBundle
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* @param locale A locale
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* @param classloader a ClassLoader
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* @return the desired resource bundle
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* @throws MissingResourceException if the resource bundle can't be found
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* @throws NullPointerException if any argument is null
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* @since 1.2
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*/
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// This method is synchronized so that the cache is properly
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// handled.
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public static final synchronized ResourceBundle getBundle
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(String baseName, Locale locale, ClassLoader classLoader)
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{
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// This implementation searches the bundle in the reverse direction
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// and builds the parent chain on the fly.
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Locale defaultLocale = Locale.getDefault();
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if (defaultLocale != lastDefaultLocale)
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{
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resourceBundleCache = new HashMap();
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lastDefaultLocale = defaultLocale;
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}
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HashMap cache = (HashMap) resourceBundleCache.get(classLoader);
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StringBuffer sb = new StringBuffer(60);
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sb.append(baseName).append('_').append(locale);
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String name = sb.toString();
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if (cache == null)
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{
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cache = new HashMap();
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resourceBundleCache.put(classLoader, cache);
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}
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else if (cache.containsKey(name))
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{
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Reference ref = (Reference) cache.get(name);
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ResourceBundle result = null;
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// If REF is null, that means that we added a `null' value to
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// the hash map. That means we failed to find the bundle
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// previously, and we cached that fact. The JDK does this, so
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// it must be ok.
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if (ref == null)
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throw new MissingResourceException("Bundle " + baseName
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+ " not found",
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baseName, "");
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else
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{
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ResourceBundle rb = (ResourceBundle) ref.get();
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if (rb != null)
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{
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// RB should already have the right parent, except if
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// something very strange happened.
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return rb;
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}
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// If RB is null, then we previously found it but it was
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// collected. So we try again.
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}
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}
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// It is ok if this returns null. We aren't required to have the
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// base bundle.
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ResourceBundle baseBundle = tryBundle(baseName, emptyLocale,
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classLoader, null, cache);
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// Now use our locale, followed by the default locale. We only
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// need to try the default locale if our locale is different, and
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// if our locale failed to yield a result other than the base
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// bundle.
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ResourceBundle bundle = tryLocalBundle(baseName, locale,
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classLoader, baseBundle, cache);
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if (bundle == baseBundle && !locale.equals(defaultLocale))
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{
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bundle = tryLocalBundle(baseName, defaultLocale,
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classLoader, baseBundle, cache);
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// We need to record that the argument locale maps to the
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// bundle we just found. If we didn't find a bundle, record
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// that instead.
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if (bundle == null)
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cache.put(name, null);
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else
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cache.put(name, new SoftReference(bundle));
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}
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if (bundle == null)
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throw new MissingResourceException("Bundle " + baseName + " not found",
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baseName, "");
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return bundle;
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}
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/**
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* Override this method to provide the resource for a keys. This gets
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* called by <code>getObject</code>. If you don't have a resource
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* for the given key, you should return null instead throwing a
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* MissingResourceException. You don't have to ask the parent, getObject()
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* already does this; nor should you throw a MissingResourceException.
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*
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* @param key the key of the resource
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* @return the resource for the key, or null if not in bundle
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* @throws NullPointerException if key is null
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*/
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protected abstract Object handleGetObject(String key);
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/**
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* This method should return all keys for which a resource exists; you
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* should include the enumeration of any parent's keys, after filtering out
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* duplicates.
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*
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* @return an enumeration of the keys
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*/
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public abstract Enumeration getKeys();
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/**
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* Tries to load a class or a property file with the specified name.
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*
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* @param localizedName the name
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* @param locale the locale, that must be used exactly
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* @param classloader the classloader
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* @param bundle the backup (parent) bundle
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* @return the resource bundle if it was loaded, otherwise the backup
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*/
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private static final ResourceBundle tryBundle(String localizedName,
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Locale locale,
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ClassLoader classloader,
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ResourceBundle bundle,
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HashMap cache)
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{
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// First look into the cache.
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if (cache.containsKey(localizedName))
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{
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Reference ref = (Reference) cache.get(localizedName);
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ResourceBundle result = null;
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// If REF is null, that means that we added a `null' value to
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// the hash map. That means we failed to find the bundle
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// previously, and we cached that fact. The JDK does this, so
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// it must be ok.
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if (ref == null)
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return null;
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else
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{
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ResourceBundle rb = (ResourceBundle) ref.get();
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if (rb != null)
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{
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// RB should already have the right parent, except if
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// something very strange happened.
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return rb;
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}
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// If RB is null, then we previously found it but it was
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// collected. So we try again.
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}
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}
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// foundBundle holds exact matches for the localizedName resource
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// bundle, which may later be cached.
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ResourceBundle foundBundle = null;
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try
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{
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Class rbClass;
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if (classloader == null)
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rbClass = Class.forName(localizedName);
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else
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rbClass = classloader.loadClass(localizedName);
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foundBundle = (ResourceBundle) rbClass.newInstance();
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foundBundle.parent = bundle;
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foundBundle.locale = locale;
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}
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catch (Exception ex)
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{
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// ignore them all
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}
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if (foundBundle == null)
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{
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try
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{
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InputStream is;
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final String resourceName
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= localizedName.replace('.', '/') + ".properties";
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if (classloader == null)
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is = ClassLoader.getSystemResourceAsStream(resourceName);
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else
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is = classloader.getResourceAsStream(resourceName);
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if (is != null)
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{
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foundBundle = new PropertyResourceBundle(is);
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foundBundle.parent = bundle;
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foundBundle.locale = locale;
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}
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}
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catch (IOException ex)
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{
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}
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}
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// Put the result into the hash table. If we didn't find anything
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// here, we record our parent bundle. If we record `null' that means
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// nothing, not even the base, was found.
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if (foundBundle == null)
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foundBundle = bundle;
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if (foundBundle == null)
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cache.put(localizedName, null);
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else
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cache.put(localizedName, new SoftReference(foundBundle));
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return foundBundle;
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}
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/**
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* Tries to load a the bundle for a given locale, also loads the backup
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* locales with the same language.
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*
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* @param name the name
|
|
* @param locale the locale
|
|
* @param classloader the classloader
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|
* @param bundle the backup (parent) bundle
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|
* @return the resource bundle if it was loaded, otherwise the backup
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|
*/
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|
private static final ResourceBundle tryLocalBundle(String baseName,
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|
Locale locale,
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|
ClassLoader classloader,
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|
ResourceBundle bundle,
|
|
HashMap cache)
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|
{
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|
final String language = locale.getLanguage();
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|
final String country = locale.getCountry();
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|
final String variant = locale.getVariant();
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|
|
|
StringBuffer sb = new StringBuffer(60);
|
|
sb.append(baseName);
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|
sb.append('_');
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|
|
|
if (language.length() > 0)
|
|
{
|
|
sb.append(language);
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|
bundle = tryBundle(sb.toString(), new Locale(language),
|
|
classloader, bundle, cache);
|
|
}
|
|
// If LANGUAGE was empty, we still need to try the other
|
|
// components, and the `_' is required.
|
|
sb.append('_');
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|
|
|
if (country.length() > 0)
|
|
{
|
|
sb.append(country);
|
|
bundle = tryBundle(sb.toString(), new Locale(language, country),
|
|
classloader, bundle, cache);
|
|
}
|
|
sb.append('_');
|
|
|
|
if (variant.length() > 0)
|
|
{
|
|
sb.append(variant);
|
|
bundle = tryBundle(sb.toString(), locale,
|
|
classloader, bundle, cache);
|
|
}
|
|
|
|
return bundle;
|
|
}
|
|
}
|