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.builder; 018 019 import org.apache.camel.Exchange; 020 import org.apache.camel.Expression; 021 import org.apache.camel.Predicate; 022 import static org.apache.camel.util.ObjectHelper.notNull; 023 024 /** 025 * A useful base class for {@link Predicate} implementations 026 * 027 * @version $Revision: 617 $ 028 */ 029 public abstract class BinaryPredicateSupport<E extends Exchange> implements Predicate<E> { 030 031 private final Expression<E> left; 032 private final Expression<E> right; 033 034 protected BinaryPredicateSupport(Expression<E> left, Expression<E> right) { 035 notNull(left, "left"); 036 notNull(right, "right"); 037 038 this.left = left; 039 this.right = right; 040 } 041 042 @Override 043 public String toString() { 044 return left + " " + getOperationText() + " " + right; 045 } 046 047 public boolean matches(E exchange) { 048 Object leftValue = left.evaluate(exchange); 049 Object rightValue = right.evaluate(exchange); 050 return matches(exchange, leftValue, rightValue); 051 } 052 053 public void assertMatches(String text, E exchange) { 054 Object leftValue = left.evaluate(exchange); 055 Object rightValue = right.evaluate(exchange); 056 if (!matches(exchange, leftValue, rightValue)) { 057 throw new AssertionError(text + assertionFailureMessage(exchange, leftValue, rightValue)); 058 } 059 } 060 061 protected abstract boolean matches(E exchange, Object leftValue, Object rightValue); 062 063 protected abstract String getOperationText(); 064 065 protected String assertionFailureMessage(E exchange, Object leftValue, Object rightValue) { 066 return this + " failed on " + exchange + " with left value <" + leftValue + "> right value <" 067 + rightValue + ">"; 068 } 069 }