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 }