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.bam.Activity; 021 import org.apache.camel.bam.model.ActivityState; 022 import org.apache.camel.bam.model.ProcessInstance; 023 024 /** 025 * @version $Revision: $ 026 */ 027 public abstract class ActivityExpressionSupport extends ProcessExpressionSupport<ProcessInstance> { 028 private Activity activity; 029 030 protected ActivityExpressionSupport(Activity activity) { 031 super(ProcessInstance.class); 032 this.activity = activity; 033 } 034 035 protected Object evaluate(Exchange exchange, ProcessInstance processEntity) { 036 ActivityState state = processEntity.getActivityState(activity); 037 if (state != null) { 038 return evaluateState(exchange, state); 039 } 040 return null; 041 } 042 043 protected abstract Object evaluateState(Exchange exchange, ActivityState state); 044 }