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Central module for Tapestry, containing interfaces to the Java
Servlet API and all core services and components.
// Copyright 2010 The Apache Software Foundation
//
// 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.apache.tapestry5.internal.services;
import org.apache.tapestry5.ioc.MessageFormatter;
import org.apache.tapestry5.ioc.Messages;
/**
* Implementation of {@link Messages} that wraps two other Messages instances: a primary and a delegate.
* The primary handles any keys it contains; method invocations that reference keys not contained by
* the primary are passed on to the delegate.
*
* @since 5.2.0
*/
public class DelegatingMessagesImpl implements Messages
{
private final Messages primary, delegate;
public DelegatingMessagesImpl(Messages primary, Messages delegate)
{
this.primary = primary;
this.delegate = delegate;
}
public boolean contains(String key)
{
return primary.contains(key) || delegate.contains(key);
}
private Messages select(String key)
{
return primary.contains(key) ? primary : delegate;
}
public String format(String key, Object... args)
{
return select(key).format(key, args);
}
public String get(String key)
{
return select(key).get(key);
}
public MessageFormatter getFormatter(String key)
{
return select(key).getFormatter(key);
}
}