/**
*
* Copyright 2004 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.geronimo.messaging.interceptors;
import org.apache.geronimo.messaging.Msg;
/**
* Inbound interceptor in charge of retrieving an header.
*
* @version $Rev: 46019 $ $Date: 2004-09-14 04:56:06 -0500 (Tue, 14 Sep 2004) $
*/
public class HeaderInInterceptor implements MsgInInterceptor
{
/**
* Header to be retrieved.
*/
private final Object header;
/**
* Inbound interceptor from which the Msgs are poped.
*/
private final MsgInInterceptor prev;
/**
* Current header value.
*/
private Object headerValue;
/**
* Creates an inbound Msgs interceptor popping messages from aPrev and
* retrieving the header identified by aHeader.
*
* @param aPrev Inbound Msgs interceptor to pop from.
* @param aHeader Identifier of the header to be retrieved.
*/
public HeaderInInterceptor(MsgInInterceptor aPrev, Object aHeader) {
if ( null == aPrev ) {
throw new IllegalArgumentException("Interceptor is required.");
} else if ( null == aHeader ) {
throw new IllegalArgumentException("Header is required.");
}
prev = aPrev;
header = aHeader;
}
/**
* Pops a Msg from the previous inbound Msg interceptor and retrieves a
* specific header.
*
* @return Msg poped from the previous interceptor.
*/
public Msg pop() {
Msg msg = prev.pop();
headerValue = msg.getHeader().getHeader(header);
return msg;
}
/**
* Gets the current header value.
*
* @return Header value.
*/
public Object getHeader() {
return headerValue;
}
}