001 /** 002 * 003 * Licensed to the Apache Software Foundation (ASF) under one or more 004 * contributor license agreements. See the NOTICE file distributed with 005 * this work for additional information regarding copyright ownership. 006 * The ASF licenses this file to You under the Apache License, Version 2.0 007 * (the "License"); you may not use this file except in compliance with 008 * the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 package org.apache.camel.impl; 019 020 import org.apache.camel.Predicate; 021 import org.apache.camel.Exchange; 022 import org.apache.camel.Expression; 023 import org.apache.camel.util.ObjectHelper; 024 import static org.apache.camel.util.ObjectHelper.notNull; 025 026 /** 027 * A useful base class for {@link Predicate} implementations 028 * 029 * @version $Revision: 1.1 $ 030 */ 031 public abstract class BinaryPredicateSupport<E extends Exchange> implements Predicate<E> { 032 033 private final Expression<E> left; 034 private final Expression<E> right; 035 036 protected BinaryPredicateSupport(Expression<E> left, Expression<E> right) { 037 notNull(left, "left"); 038 notNull(right, "right"); 039 040 this.left = left; 041 this.right = right; 042 } 043 044 @Override 045 public String toString() { 046 return left + " " + getOperationText() + " " + right; 047 } 048 049 public boolean matches(E exchange) { 050 Object leftValue = left.evaluate(exchange); 051 Object rightValue = right.evaluate(exchange); 052 return matches(exchange, leftValue, rightValue); 053 } 054 055 public void assertMatches(String text, E exchange) { 056 Object leftValue = left.evaluate(exchange); 057 Object rightValue = right.evaluate(exchange); 058 if (!matches(exchange, leftValue, rightValue)) { 059 throw new AssertionError(assertionFailureMessage(exchange, leftValue, rightValue)); 060 } 061 } 062 063 protected abstract boolean matches(E exchange, Object leftValue, Object rightValue); 064 065 protected abstract String getOperationText(); 066 067 protected String assertionFailureMessage(E exchange, Object leftValue, Object rightValue) { 068 return this + " failed on " + exchange + " with left value <" + leftValue + "> right value <" + rightValue + ">"; 069 } 070 }