/*
* Copyright 2003-2010 the original author or authors.
*
* Licensed 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.codehaus.groovy.tools.shell.util;
import java.util.ResourceBundle;
import java.util.MissingResourceException;
import java.text.MessageFormat;
import groovy.lang.GroovyObjectSupport;
/**
* Message source backed up by one or more {@link java.util.ResourceBundle}
* instances for simple i18n support.
*
* @version $Id$
* @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
*/
public class MessageSource
extends GroovyObjectSupport
{
private final String[] bundleNames;
private ResourceBundle[] cachedBundles;
public MessageSource(final String[] names) {
assert names != null;
assert names.length != 0;
this.bundleNames = names;
}
public MessageSource(final String name) {
this(new String[] { name });
}
private static String[] classNames(final Class[] types) {
assert types != null;
assert types.length != 0;
String[] names = new String[types.length];
for (int i=0; i<types.length; i++) {
assert types[i] != null;
names[i] = types[i].getName();
}
return names;
}
public MessageSource(final Class[] types) {
this(classNames(types));
}
public MessageSource(final Class type) {
this(new String[] { type.getName() });
}
private ResourceBundle[] createBundles() {
ResourceBundle[] bundles = new ResourceBundle[bundleNames.length];
for (int i=0; i<bundleNames.length; i++) {
assert bundleNames[i] != null;
bundles[i] = ResourceBundle.getBundle(bundleNames[i]);
}
return bundles;
}
private ResourceBundle[] getBundles() {
if (cachedBundles == null) {
cachedBundles = createBundles();
}
return cachedBundles;
}
/**
* Get a raw message from the resource bundles using the given code.
*/
public String getMessage(final String code) {
assert code != null;
MissingResourceException error = null;
ResourceBundle[] bundles = getBundles();
for (int i=0; i<bundles.length; i++) {
try {
return bundles[i].getString(code);
}
catch (MissingResourceException e) {
//
// FIXME: For now just save the first error, should really roll a new message with all of the details
//
if (error != null) {
error = e;
}
}
}
assert error != null;
throw error;
}
/**
* Format a message (based on {@link MessageFormat} using the message
* from the resource bundles using the given code as a pattern and the
* given objects as arguments.
*/
public String format(final String code, final Object[] args) {
assert args != null;
String pattern = getMessage(code);
return MessageFormat.format(pattern, args);
}
/**
* @see #getMessage(String)
*/
public Object getProperty(final String name) {
return getMessage(name);
}
}