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 }