/*
* Copyright 2002-2009 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.integration.transformer;
import org.springframework.messaging.Message;
/**
* A base class for {@link Transformer} implementations that modify the payload
* of a {@link Message}. If the return value is itself a Message, it will be
* used as the result. Otherwise, the return value will be used as the payload
* of the result Message.
*
* @author Mark Fisher
*/
public abstract class AbstractPayloadTransformer<T, U> extends AbstractTransformer {
@SuppressWarnings("unchecked")
public final U doTransform(Message<?> message) throws Exception {
return this.transformPayload((T) message.getPayload());
}
protected abstract U transformPayload(T payload) throws Exception;
}