001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.bam;
018
019 import org.apache.camel.Exchange;
020 import org.apache.camel.Expression;
021
022 /**
023 * @version $Revision: $
024 */
025 public abstract class ProcessExpressionSupport<T> implements Expression<Exchange> {
026
027 public static final String PROCESS_PROPERTY = "org.apache.camel.bam.Process";
028
029 private Class<T> type;
030
031 protected ProcessExpressionSupport(Class<T> type) {
032 this.type = type;
033 }
034
035 public static <T> T getProcessEntity(Exchange exchange, Class<T> type) {
036 return exchange.getProperty(PROCESS_PROPERTY, type);
037 }
038
039 public static <T> void storeProcessEntity(Exchange exchange, T processEntity) {
040 exchange.setProperty(PROCESS_PROPERTY, processEntity);
041 }
042
043 public Object evaluate(Exchange exchange) {
044 T processEntity = getProcessEntity(exchange, type);
045 return evaluate(exchange, processEntity);
046 }
047
048 protected abstract Object evaluate(Exchange exchange, T processEntity);
049 }