mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-26 15:49:41 +08:00
475 lines
15 KiB
Java
475 lines
15 KiB
Java
/* java.util.ResourceBundle
|
|
Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package java.util;
|
|
import java.lang.ref.Reference;
|
|
import java.lang.ref.SoftReference;
|
|
import java.security.AccessController;
|
|
import java.security.PrivilegedAction;
|
|
import gnu.classpath.Configuration;
|
|
|
|
/**
|
|
* A resource bundle contains locale-specific data. If you need
|
|
* localized data, you can load a resource bundle that matches the
|
|
* locale with <code>getBundle</code>. Now you can get your object by
|
|
* calling <code>getObject</code> or <code>getString</code> on that
|
|
* bundle.
|
|
* <br>
|
|
* When a bundle is demanded for a specific locale, the ResourceBundle
|
|
* is searched in following order (<i>def. language code<i> stands for
|
|
* the two letter ISO language code of the default locale (see
|
|
* <code>Locale.getDefault()</code>).
|
|
* <pre>
|
|
* baseName_<i>language code</i>_<i>country code</i>_<i>variant</i>
|
|
* baseName_<i>language code</i>_<i>country code</i>
|
|
* baseName_<i>language code</i>
|
|
* baseName_<i>def. language code</i>_<i>def. country code</i>_<i>def. variant</i>
|
|
* baseName_<i>def. language code</i>_<i>def. country code</i>
|
|
* baseName_<i>def. language code</i>
|
|
* baseName
|
|
* </pre>
|
|
*
|
|
* A bundle is backed up, by less specific bundle (omiting variant,
|
|
* country or language). But it is not backed up by the default
|
|
* language locale.
|
|
* <br>
|
|
* If you provide a bundle for a given locale, say
|
|
* <code>Bundle_en_UK_POSIX</code>, you must also provide a bundle for
|
|
* all sub locales, ie. <code>Bundle_en_UK</code>, <code>Bundle_en</code>, and
|
|
* <code>Bundle</code>.
|
|
* <br>
|
|
* When a bundle is searched, we look first for a class with
|
|
* the given name and if that is not found for a file with
|
|
* <code>.properties</code> extension in the classpath. The name
|
|
* must be a fully qualified classname (with dots as path separators).
|
|
* <br>
|
|
* (Note: This implementation always backs up the class with a
|
|
* properties file if that is existing, but you shouldn't rely on
|
|
* this, if you want to be compatible to the standard JDK.)
|
|
*
|
|
* @see Locale
|
|
* @see PropertyResourceBundle
|
|
* @author Jochen Hoenicke */
|
|
public abstract class ResourceBundle
|
|
{
|
|
/**
|
|
* The parent bundle. This is consulted when you call getObject
|
|
* and there is no such resource in the current bundle. This
|
|
* field may be null.
|
|
*/
|
|
protected ResourceBundle parent;
|
|
|
|
/**
|
|
* The locale of this resource bundle. You can read this with
|
|
* <code>getLocale</code> and it is automatically set in
|
|
* <code>getBundle</code>.
|
|
*/
|
|
private Locale locale;
|
|
|
|
/**
|
|
* We override SecurityManager in order to access getClassContext().
|
|
*/
|
|
static class Security extends SecurityManager
|
|
{
|
|
/** Return the ClassLoader of the class which called into this
|
|
ResourceBundle, or null if it cannot be determined. */
|
|
ClassLoader getCallingClassLoader()
|
|
{
|
|
Class[] stack = super.getClassContext();
|
|
for (int i = 0; i < stack.length; i++)
|
|
if (stack[i] != Security.class && stack[i] != ResourceBundle.class)
|
|
return stack[i].getClassLoader();
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// This will always work since java.util classes have (all) system
|
|
// permissions.
|
|
static Security security = (Security) AccessController.doPrivileged
|
|
(
|
|
new PrivilegedAction()
|
|
{
|
|
public Object run()
|
|
{
|
|
return new Security();
|
|
}
|
|
}
|
|
);
|
|
|
|
/**
|
|
* The constructor. It does nothing special.
|
|
*/
|
|
public ResourceBundle()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Get a String from this resource bundle. Since most localized
|
|
* Objects are Strings, this method provides a convenient way to get
|
|
* them without casting.
|
|
* @param key the name of the resource.
|
|
* @exception MissingResourceException
|
|
* if that particular object could not be found in this bundle nor
|
|
* the parent bundle.
|
|
*/
|
|
public final String getString(String key) throws MissingResourceException
|
|
{
|
|
return (String) getObject(key);
|
|
}
|
|
|
|
/**
|
|
* Get an array of Strings from this resource bundle. This method
|
|
* provides a convenient way to get it without casting.
|
|
* @param key the name of the resource.
|
|
* @exception MissingResourceException
|
|
* if that particular object could not be found in this bundle nor
|
|
* the parent bundle.
|
|
*/
|
|
public final String[] getStringArray(String key)
|
|
throws MissingResourceException
|
|
{
|
|
return (String[]) getObject(key);
|
|
}
|
|
|
|
/**
|
|
* Get an object from this resource bundle.
|
|
* @param key the name of the resource.
|
|
* @exception MissingResourceException
|
|
* if that particular object could not be found in this bundle nor
|
|
* the parent bundle.
|
|
*/
|
|
public final Object getObject(String key) throws MissingResourceException
|
|
{
|
|
for (ResourceBundle bundle = this; bundle != null; bundle = bundle.parent)
|
|
{
|
|
try
|
|
{
|
|
Object o = bundle.handleGetObject(key);
|
|
if (o != null)
|
|
return o;
|
|
}
|
|
catch (MissingResourceException ex)
|
|
{
|
|
}
|
|
}
|
|
throw new MissingResourceException
|
|
("Key not found", getClass().getName(), key);
|
|
}
|
|
|
|
/**
|
|
* Get the appropriate ResourceBundle for the default locale.
|
|
* @param baseName the name of the ResourceBundle. This should be
|
|
* a name of a Class or a properties-File. See the class
|
|
* description for details.
|
|
* @return the desired resource bundle
|
|
* @exception MissingResourceException
|
|
* if the resource bundle couldn't be found.
|
|
*/
|
|
public static final ResourceBundle getBundle(String baseName)
|
|
throws MissingResourceException
|
|
{
|
|
return getBundle(baseName, Locale.getDefault(),
|
|
security.getCallingClassLoader());
|
|
}
|
|
|
|
/**
|
|
* Get the appropriate ResourceBundle for the given locale.
|
|
* @param baseName the name of the ResourceBundle. This should be
|
|
* a name of a Class or a properties-File. See the class
|
|
* description for details.
|
|
* @param locale A locale.
|
|
* @return the desired resource bundle
|
|
* @exception MissingResourceException
|
|
* if the resource bundle couldn't be found.
|
|
*/
|
|
public static final ResourceBundle getBundle(String baseName,
|
|
Locale locale)
|
|
throws MissingResourceException
|
|
{
|
|
return getBundle(baseName, locale, security.getCallingClassLoader());
|
|
}
|
|
|
|
/**
|
|
* The resource bundle cache. This is a two-level hash map: The key
|
|
* is the class loader, the value is a new HashMap. The key of this
|
|
* second hash map is the localized name, the value is a soft
|
|
* references to the resource bundle. */
|
|
private static Map resourceBundleCache = new HashMap();
|
|
|
|
/**
|
|
* The `empty' locale is created once in order to optimize
|
|
* tryBundle().
|
|
*/
|
|
private static final Locale emptyLocale = new Locale ("", "");
|
|
|
|
/**
|
|
* Tries to load a class or a property file with the specified name.
|
|
* @param localizedName the name.
|
|
* @param locale the locale, that must be used exactly.
|
|
* @param classloader the classloader.
|
|
* @param bundle the back up (parent) bundle
|
|
* @return the resource bundle if that could be loaded, otherwise
|
|
* <code>bundle</code>.
|
|
*/
|
|
private static final ResourceBundle tryBundle(String localizedName,
|
|
Locale locale,
|
|
ClassLoader classloader,
|
|
ResourceBundle bundle,
|
|
HashMap cache)
|
|
{
|
|
{
|
|
// First look into the cache.
|
|
// XXX We should remove cleared references from the cache.
|
|
Reference ref = (Reference) cache.get(localizedName);
|
|
if (ref != null)
|
|
{
|
|
ResourceBundle rb = (ResourceBundle) ref.get();
|
|
if (rb != null)
|
|
// rb should already have the right parent, except if
|
|
// something very strange happened.
|
|
return rb;
|
|
}
|
|
}
|
|
|
|
// foundBundle holds exact matches for the localizedName resource
|
|
// bundle, which may later be cached.
|
|
ResourceBundle foundBundle = null;
|
|
|
|
try
|
|
{
|
|
java.io.InputStream is;
|
|
final String resourceName =
|
|
localizedName.replace('.', '/') + ".properties";
|
|
if (classloader == null)
|
|
is = ClassLoader.getSystemResourceAsStream (resourceName);
|
|
else
|
|
is = classloader.getResourceAsStream (resourceName);
|
|
if (is != null)
|
|
{
|
|
foundBundle = new PropertyResourceBundle(is);
|
|
foundBundle.parent = bundle;
|
|
foundBundle.locale = locale;
|
|
}
|
|
}
|
|
catch (java.io.IOException ex)
|
|
{
|
|
}
|
|
|
|
try
|
|
{
|
|
Class rbClass;
|
|
if (classloader == null)
|
|
rbClass = Class.forName(localizedName);
|
|
else
|
|
rbClass = classloader.loadClass(localizedName);
|
|
foundBundle = (ResourceBundle) rbClass.newInstance();
|
|
foundBundle.parent = bundle;
|
|
foundBundle.locale = locale;
|
|
}
|
|
catch (ClassNotFoundException ex)
|
|
{
|
|
}
|
|
catch (IllegalAccessException ex)
|
|
{
|
|
}
|
|
catch (InstantiationException ex)
|
|
{
|
|
// ignore them all
|
|
// XXX should we also ignore ClassCastException?
|
|
}
|
|
|
|
if (foundBundle != null)
|
|
cache.put(localizedName, new SoftReference(foundBundle));
|
|
|
|
return foundBundle != null ? foundBundle : bundle;
|
|
}
|
|
|
|
/**
|
|
* Tries to load a the bundle for a given locale, also loads the backup
|
|
* locales with the same language.
|
|
*
|
|
* @param name the name.
|
|
* @param locale the locale, that must be used exactly.
|
|
* @param classloader the classloader.
|
|
* @param bundle the back up (parent) bundle
|
|
* @return the resource bundle if that could be loaded, otherwise
|
|
* <code>bundle</code>.
|
|
*/
|
|
private static final ResourceBundle tryLocalBundle(String baseName,
|
|
Locale locale,
|
|
ClassLoader classloader,
|
|
ResourceBundle bundle,
|
|
HashMap cache)
|
|
{
|
|
final String language = locale.getLanguage();
|
|
|
|
if (language.length() > 0)
|
|
{
|
|
final String country = locale.getCountry();
|
|
String name = baseName + "_" + language;
|
|
|
|
if (country.length() != 0)
|
|
{
|
|
bundle = tryBundle(name,
|
|
new Locale(language, ""),
|
|
classloader, bundle, cache);
|
|
|
|
name += "_" + country;
|
|
|
|
final String variant = locale.getVariant();
|
|
|
|
if (variant.length() != 0)
|
|
{
|
|
bundle = tryBundle(name,
|
|
new Locale(language,
|
|
country),
|
|
classloader, bundle, cache);
|
|
|
|
name += "_" + variant;
|
|
}
|
|
}
|
|
bundle = tryBundle(name, locale, classloader, bundle, cache);
|
|
}
|
|
return bundle;
|
|
}
|
|
|
|
/**
|
|
* Get the appropriate ResourceBundle for the given locale.
|
|
* @param baseName the name of the ResourceBundle. This should be
|
|
* a name of a Class or a properties file. See the class
|
|
* description for details.
|
|
* @param locale A locale.
|
|
* @param classloader a ClassLoader.
|
|
* @return the desired resource bundle
|
|
* @exception MissingResourceException
|
|
* if the resource bundle couldn't be found.
|
|
*/
|
|
// This method is synchronized so that the cache is properly
|
|
// handled.
|
|
public static final synchronized ResourceBundle getBundle(String baseName,
|
|
Locale locale,
|
|
ClassLoader classLoader)
|
|
throws MissingResourceException
|
|
{
|
|
// This implementation searches the bundle in the reverse direction
|
|
// and builds the parent chain on the fly.
|
|
|
|
HashMap cache = (HashMap) resourceBundleCache.get(classLoader);
|
|
if (cache == null)
|
|
{
|
|
cache = new HashMap();
|
|
resourceBundleCache.put(classLoader, cache);
|
|
}
|
|
else
|
|
{
|
|
// Fast path: If baseName + "_" + locale is in cache use it.
|
|
String name = baseName + "_" + locale.toString();
|
|
Reference ref = (Reference) cache.get(name);
|
|
if (ref != null)
|
|
{
|
|
ResourceBundle rb = (ResourceBundle) ref.get();
|
|
if (rb != null)
|
|
// rb should already have the right parent, except if
|
|
// something very strange happened.
|
|
return rb;
|
|
}
|
|
}
|
|
|
|
ResourceBundle baseBundle = tryBundle(baseName, emptyLocale,
|
|
classLoader, null, cache);
|
|
if (baseBundle == null)
|
|
// JDK says, that if one provides a bundle base_en_UK, one
|
|
// must also provide the bundles base_en and base.
|
|
// This implies that if there is no bundle for base, there
|
|
// is no bundle at all.
|
|
throw new MissingResourceException("Bundle " + baseName + " not found", baseName, "");
|
|
|
|
// Now use the default locale.
|
|
ResourceBundle bundle = tryLocalBundle(baseName, locale,
|
|
classLoader, baseBundle, cache);
|
|
if (bundle == baseBundle && !locale.equals(Locale.getDefault()))
|
|
{
|
|
bundle = tryLocalBundle(baseName, Locale.getDefault(),
|
|
classLoader, baseBundle, cache);
|
|
}
|
|
return bundle;
|
|
}
|
|
|
|
/**
|
|
* Return the actual locale of this bundle. You can use it after
|
|
* calling getBundle, to know if the bundle for the desired locale
|
|
* was loaded or if the fall back was used.
|
|
*/
|
|
public Locale getLocale()
|
|
{
|
|
return locale;
|
|
}
|
|
|
|
/**
|
|
* Set the parent of this bundle. This is consulted when you call
|
|
* getObject and there is no such resource in the current bundle.
|
|
* @param parent the parent of this bundle.
|
|
*/
|
|
protected void setParent(ResourceBundle parent)
|
|
{
|
|
// Shall we ignore the old parent?
|
|
this.parent = parent;
|
|
}
|
|
|
|
/**
|
|
* Override this method to provide the resource for a keys. This gets
|
|
* called by <code>getObject</code>. If you don't have a resource
|
|
* for the given key, you should return null instead throwing a
|
|
* MissingResourceException. You don't have to ask the parent,
|
|
* getObject() already does this.
|
|
*
|
|
* @param key The key of the resource.
|
|
* @return The resource for the key, or null if not in bundle.
|
|
* @exception MissingResourceException
|
|
* you shouldn't throw this.
|
|
*/
|
|
protected abstract Object handleGetObject(String key)
|
|
throws MissingResourceException;
|
|
|
|
/**
|
|
* This method should return all keys for which a resource exists.
|
|
* @return An enumeration of the keys.
|
|
*/
|
|
public abstract Enumeration getKeys();
|
|
}
|