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 */ 017package org.apache.camel.processor; 018 019import org.apache.camel.AsyncCallback; 020import org.apache.camel.AsyncProcessor; 021import org.apache.camel.Exchange; 022import org.apache.camel.Expression; 023import org.apache.camel.Traceable; 024import org.apache.camel.spi.IdAware; 025import org.apache.camel.support.ServiceSupport; 026import org.apache.camel.util.AsyncProcessorHelper; 027import org.apache.camel.util.ObjectHelper; 028 029/** 030 * A processor which executes the script as an expression and does not change the message body. 031 */ 032public class ScriptProcessor extends ServiceSupport implements AsyncProcessor, Traceable, IdAware { 033 private String id; 034 private final Expression expression; 035 036 public ScriptProcessor(Expression expression) { 037 ObjectHelper.notNull(expression, "expression", this); 038 this.expression = expression; 039 } 040 041 public void process(Exchange exchange) throws Exception { 042 AsyncProcessorHelper.process(this, exchange); 043 } 044 045 public boolean process(Exchange exchange, AsyncCallback callback) { 046 try { 047 expression.evaluate(exchange, Object.class); 048 } catch (Throwable e) { 049 exchange.setException(e); 050 } 051 052 callback.done(true); 053 return true; 054 } 055 056 @Override 057 public String toString() { 058 return "Script(" + expression + ")"; 059 } 060 061 public String getTraceLabel() { 062 return "script[" + expression + "]"; 063 } 064 065 public String getId() { 066 return id; 067 } 068 069 public void setId(String id) { 070 this.id = id; 071 } 072 073 public Expression getExpression() { 074 return expression; 075 } 076 077 @Override 078 protected void doStart() throws Exception { 079 // noop 080 } 081 082 @Override 083 protected void doStop() throws Exception { 084 // noop 085 } 086}