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.impl; 018 019 import org.apache.camel.Exchange; 020 import org.apache.camel.Expression; 021 import org.apache.camel.Predicate; 022 import org.apache.camel.util.ObjectHelper; 023 024 /** 025 * A useful base class for {@link Predicate} and {@link Expression} implementations 026 * 027 * @version $Revision: 617 $ 028 */ 029 public abstract class ExpressionSupport<E extends Exchange> implements Expression<E> , Predicate<E> { 030 031 public boolean matches(E exchange) { 032 Object value = evaluate(exchange); 033 return ObjectHelper.evaluateValuePredicate(value); 034 } 035 036 public void assertMatches(String text, E exchange) { 037 if (!matches(exchange)) { 038 throw new AssertionError(text + " " + assertionFailureMessage(exchange) + " for exchange: " + exchange); 039 } 040 } 041 042 protected abstract String assertionFailureMessage(E exchange); 043 }