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 static org.apache.camel.util.ObjectHelper.notNull;
023
024 /**
025 * A useful base class for {@link Predicate} implementations
026 *
027 * @deprecated is a duplicate of the same class in the builder package. Will be removed in Camel 2.0
028 * @version $Revision: 729898 $
029 */
030 public abstract class BinaryPredicateSupport<E extends Exchange> implements Predicate<E> {
031
032 private final Expression<E> left;
033 private final Expression<E> right;
034
035 protected BinaryPredicateSupport(Expression<E> left, Expression<E> right) {
036 notNull(left, "left");
037 notNull(right, "right");
038
039 this.left = left;
040 this.right = right;
041 }
042
043 @Override
044 public String toString() {
045 return left + " " + getOperationText() + " " + right;
046 }
047
048 public boolean matches(E exchange) {
049 Object leftValue = left.evaluate(exchange);
050 Object rightValue = right.evaluate(exchange);
051 return matches(exchange, leftValue, rightValue);
052 }
053
054 public void assertMatches(String text, E exchange) {
055 Object leftValue = left.evaluate(exchange);
056 Object rightValue = right.evaluate(exchange);
057 if (!matches(exchange, leftValue, rightValue)) {
058 throw new AssertionError(text + assertionFailureMessage(exchange, leftValue, rightValue));
059 }
060 }
061
062 protected abstract boolean matches(E exchange, Object leftValue, Object rightValue);
063
064 protected abstract String getOperationText();
065
066 protected String assertionFailureMessage(E exchange, Object leftValue, Object rightValue) {
067 return this + " failed on " + exchange + " with left value <" + leftValue + "> right value <"
068 + rightValue + ">";
069 }
070 }