org.apache.axis2.i18n.ProjectResourceBundle Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.axis2.i18n;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
/**
* Wrapper class for resource bundles. Property files are used to store
* resource strings, which are the only types of resources available.
* Property files can inherit properties from other files so that
* a base property file can be used and a small number of properties
* can be over-ridden by another property file. For example you may
* create an english version of a resource file named "resource.properties".
* You then decide that the British English version of all of the properties
* except one are the same, so there is no need to redefine all of the
* properties in "resource_en_GB", just the one that is different.
* The basename is the name of the property file without the ".properties"
* extension.
* Properties will be cached for performance.
*
Property values stored in the property files can also contain dynamic
* variables. Any dynamic variable defined in PropertiesUtil.getVariableValue()
* can be used (such as {date}), as well as arguments in the form {0}, {1}, etc.
* Argument values are specified in the various overloaded getString() methods.
*/
public class ProjectResourceBundle extends ResourceBundle {
private static final Log log = LogFactory.getLog(ProjectResourceBundle.class);
// The static cache of ResourceBundles.
// The key is the 'basename + locale + default locale'
// The element is a ResourceBundle object
private static final Hashtable bundleCache = new Hashtable();
private static final Locale defaultLocale = Locale.getDefault();
private final ResourceBundle resourceBundle;
private final String resourceName;
protected Object handleGetObject(String key)
throws MissingResourceException {
if (log.isDebugEnabled()) {
log.debug(this.toString() + "::handleGetObject(" + key + ")");
}
Object obj;
try {
obj = resourceBundle.getObject(key);
} catch (MissingResourceException e) {
/* catch missing resource, ignore, & return null
* if this method doesn't return null, then parents
* are not searched
*/
obj = null;
}
return obj;
}
public Enumeration getKeys() {
Enumeration myKeys = resourceBundle.getKeys();
if (parent == null) {
return myKeys;
} else {
final HashSet set = new HashSet();
while (myKeys.hasMoreElements()) {
set.add(myKeys.nextElement());
}
Enumeration pKeys = parent.getKeys();
while (pKeys.hasMoreElements()) {
set.add(pKeys.nextElement());
}
return new Enumeration() {
private Iterator it = set.iterator();
public boolean hasMoreElements() {
return it.hasNext();
}
public Object nextElement() {
return it.next();
}
};
}
}
/**
* Construct a new ProjectResourceBundle
*
* @param projectName The name of the project to which the class belongs.
* It must be a proper prefix of the caller's package.
* @param packageName The package name to further construct
* the basename.
* @param resourceName The name of the resource without the
* ".properties" extension
* @throws MissingResourceException if projectName is not a prefix of
* the caller's package name, or if the resource could not be
* found/loaded.
*/
public static ProjectResourceBundle getBundle(String projectName,
String packageName,
String resourceName)
throws MissingResourceException {
return getBundle(projectName, packageName, resourceName, null, null, null);
}
/**
* Construct a new ProjectResourceBundle
*
* @param projectName The name of the project to which the class belongs.
* It must be a proper prefix of the caller's package.
* @param caller The calling class.
* @param resourceName The name of the resource without the
* ".properties" extension
* @throws MissingResourceException if projectName is not a prefix of
* the caller's package name, or if the resource could not be
* found/loaded.
*/
public static ProjectResourceBundle getBundle(String projectName,
Class caller,
String resourceName,
Locale locale)
throws MissingResourceException {
return getBundle(projectName,
caller,
resourceName,
locale,
null);
}
/**
* Construct a new ProjectResourceBundle
*
* @param projectName The name of the project to which the class belongs.
* It must be a proper prefix of the caller's package.
* @param packageName The package name to construct base name.
* @param resourceName The name of the resource without the
* ".properties" extension
* @param locale The locale
* @throws MissingResourceException if projectName is not a prefix of
* the caller's package name, or if the resource could not be
* found/loaded.
*/
public static ProjectResourceBundle getBundle(String projectName,
String packageName,
String resourceName,
Locale locale,
ClassLoader loader)
throws MissingResourceException {
return getBundle(projectName, packageName, resourceName, locale, loader, null);
}
/**
* Construct a new ProjectResourceBundle
*
* @param projectName The name of the project to which the class belongs.
* It must be a proper prefix of the caller's package.
* @param caller The calling class.
* This is used to get the package name to further construct
* the basename as well as to get the proper ClassLoader.
* @param resourceName The name of the resource without the
* ".properties" extension
* @param locale The locale
* @param extendsBundle If non-null, then this ExtendMessages will
* default to extendsBundle.
* @throws MissingResourceException if projectName is not a prefix of
* the caller's package name, or if the resource could not be
* found/loaded.
*/
public static ProjectResourceBundle getBundle(String projectName,
Class caller,
String resourceName,
Locale locale,
ResourceBundle extendsBundle)
throws MissingResourceException {
return getBundle(projectName,
getPackage(caller.getClass().getName()),
resourceName,
locale,
caller.getClass().getClassLoader(),
extendsBundle);
}
/**
* Construct a new ProjectResourceBundle
*
* @param projectName The name of the project to which the class belongs.
* It must be a proper prefix of the caller's package.
* @param packageName The package name to further construct
* the basename.
* @param resourceName The name of the resource without the
* ".properties" extension
* @param locale The locale
* @param extendsBundle If non-null, then this ExtendMessages will
* default to extendsBundle.
* @throws MissingResourceException if projectName is not a prefix of
* the caller's package name, or if the resource could not be
* found/loaded.
*/
public static ProjectResourceBundle getBundle(String projectName,
String packageName,
String resourceName,
Locale locale,
ClassLoader loader,
ResourceBundle extendsBundle)
throws MissingResourceException {
if (log.isDebugEnabled()) {
log.debug("getBundle(" + projectName + ","
+ packageName + ","
+ resourceName + ","
+ String.valueOf(locale) + ",...)");
}
Context context = new Context();
context.setLocale(locale);
context.setLoader(loader);
context.setProjectName(projectName);
context.setResourceName(resourceName);
context.setParentBundle(extendsBundle);
packageName = context.validate(packageName);
ProjectResourceBundle bundle = null;
try {
bundle = getBundle(context, packageName);
} catch (RuntimeException e) {
log.debug("Exception: ", e);
throw e;
}
if (bundle == null) {
throw new MissingResourceException("Cannot find resource '" +
packageName + '.' + resourceName + "'",
resourceName, "");
}
return bundle;
}
/**
* get bundle...
* - check cache
* - try up hierarchy
* - if at top of hierarchy, use (link to) context.getParentBundle()
*/
private static synchronized ProjectResourceBundle getBundle(Context context, String packageName)
throws MissingResourceException {
String cacheKey = context.getCacheKey(packageName);
ProjectResourceBundle prb = (ProjectResourceBundle) bundleCache.get(cacheKey);
if (prb == null) {
String name = packageName + '.' + context.getResourceName();
ResourceBundle rb = context.loadBundle(packageName);
ResourceBundle parent = context.getParentBundle(packageName);
if (rb != null) {
prb = new ProjectResourceBundle(name, rb);
prb.setParent(parent);
if (log.isDebugEnabled()) {
log.debug("Created " + prb + ", linked to parent " + String.valueOf(parent));
}
} else {
if (parent != null) {
if (parent instanceof ProjectResourceBundle) {
prb = (ProjectResourceBundle) parent;
} else {
prb = new ProjectResourceBundle(name, parent);
}
if (log.isDebugEnabled()) {
log.debug("Root package not found, cross link to " + parent);
}
}
}
if (prb != null) {
// Cache the resource
bundleCache.put(cacheKey, prb);
}
}
return prb;
}
private static String getPackage(String name) {
return name.substring(0, name.lastIndexOf('.')).intern();
}
/**
* Construct a new ProjectResourceBundle
*/
private ProjectResourceBundle(String name, ResourceBundle bundle)
throws MissingResourceException {
this.resourceBundle = bundle;
this.resourceName = name;
}
public String getResourceName() {
return resourceName;
}
/**
* Clears the internal cache
*/
// public static void clearCache() {
// bundleCache.clear();
// }
public String toString() {
return resourceName;
}
private static class Context {
private Locale _locale;
private ClassLoader _loader;
private String _projectName;
private String _resourceName;
private ResourceBundle _parent;
void setLocale(Locale l) {
/* 1. Docs indicate that if locale is not specified,
* then the default local is used in it's place.
* 2. A null value for locale is invalid.
*
* Therefore, default...
*/
_locale = (l == null) ? defaultLocale : l;
}
void setLoader(ClassLoader l) {
_loader = (l != null) ? l : this.getClass().getClassLoader();
// START FIX: http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16868
if (_loader == null) {
_loader = ClassLoader.getSystemClassLoader();
}
// END FIX: http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16868
}
void setProjectName(String name) {
_projectName = name.intern();
}
void setResourceName(String name) {
_resourceName = name.intern();
}
void setParentBundle(ResourceBundle b) {
_parent = b;
}
Locale getLocale() {
return _locale;
}
ClassLoader getLoader() {
return _loader;
}
String getProjectName() {
return _projectName;
}
String getResourceName() {
return _resourceName;
}
ResourceBundle getParentBundle() {
return _parent;
}
String getCacheKey(String packageName) {
String loaderName = (_loader == null) ? "" : (":" + _loader.hashCode());
return packageName + "." + _resourceName + ":" + _locale + ":" + defaultLocale +
loaderName;
}
ResourceBundle loadBundle(String packageName) {
try {
return ResourceBundle.getBundle(packageName + '.' + _resourceName,
_locale,
_loader);
} catch (MissingResourceException e) {
// Deliberately surpressing print stack.. just the string for info.
log.debug("loadBundle: Ignoring MissingResourceException: " + e.getMessage());
}
return null;
}
ResourceBundle getParentBundle(String packageName) {
ResourceBundle p;
if (!packageName.equals(_projectName)) {
p = getBundle(this, getPackage(packageName));
} else {
p = _parent;
_parent = null;
}
return p;
}
String validate(String packageName)
throws MissingResourceException {
if (_projectName == null || _projectName.length() == 0) {
log.debug("Project name not specified");
throw new MissingResourceException("Project name not specified",
"", "");
}
if (packageName == null || packageName.length() == 0) {
log.debug("Package name not specified");
throw new MissingResourceException("Package not specified",
packageName, "");
}
packageName = packageName.intern();
/* Ensure that project is a proper prefix of class.
* Terminate project name with '.' to ensure proper match.
*/
if (!packageName.equals(_projectName) && !packageName.startsWith(_projectName + '.')) {
log.debug("Project not a prefix of Package");
throw new MissingResourceException("Project '" + _projectName
+ "' must be a prefix of Package '"
+ packageName + "'",
packageName + '.' + _resourceName, "");
}
return packageName;
}
}
}
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