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: 709635 $
028 */
029 public abstract class BinaryPredicateSupport implements Predicate {
030
031 private final Expression left;
032 private final Expression right;
033
034 protected BinaryPredicateSupport(Expression left, Expression 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(Exchange 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, Exchange 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(Exchange exchange, Object leftValue, Object rightValue);
062
063 protected abstract String getOperationText();
064
065 protected String assertionFailureMessage(Exchange exchange, Object leftValue, Object rightValue) {
066 return this + " failed on " + exchange
067 + " with left value <" + leftValue + "> right value <" + rightValue + ">";
068 }
069 }