/*
* Copyright 2002-2008 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.springframework.context.support;
import java.util.Locale;
import org.springframework.context.HierarchicalMessageSource;
import org.springframework.context.MessageSource;
import org.springframework.context.MessageSourceResolvable;
import org.springframework.context.NoSuchMessageException;
/**
* Empty {@link MessageSource} that delegates all calls to the parent MessageSource.
* If no parent is available, it simply won't resolve any message.
*
* <p>Used as placeholder by AbstractApplicationContext, if the context doesn't
* define its own MessageSource. Not intended for direct use in applications.
*
* @author Juergen Hoeller
* @since 1.1.5
* @see AbstractApplicationContext
*/
public class DelegatingMessageSource extends MessageSourceSupport implements HierarchicalMessageSource {
private MessageSource parentMessageSource;
public void setParentMessageSource(MessageSource parent) {
this.parentMessageSource = parent;
}
public MessageSource getParentMessageSource() {
return this.parentMessageSource;
}
public String getMessage(String code, Object[] args, String defaultMessage, Locale locale) {
if (this.parentMessageSource != null) {
return this.parentMessageSource.getMessage(code, args, defaultMessage, locale);
}
else {
return renderDefaultMessage(defaultMessage, args, locale);
}
}
public String getMessage(String code, Object[] args, Locale locale) throws NoSuchMessageException {
if (this.parentMessageSource != null) {
return this.parentMessageSource.getMessage(code, args, locale);
}
else {
throw new NoSuchMessageException(code, locale);
}
}
public String getMessage(MessageSourceResolvable resolvable, Locale locale) throws NoSuchMessageException {
if (this.parentMessageSource != null) {
return this.parentMessageSource.getMessage(resolvable, locale);
}
else {
if (resolvable.getDefaultMessage() != null) {
return renderDefaultMessage(resolvable.getDefaultMessage(), resolvable.getArguments(), locale);
}
String[] codes = resolvable.getCodes();
String code = (codes != null && codes.length > 0 ? codes[0] : null);
throw new NoSuchMessageException(code, locale);
}
}
}
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