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.util;
018    
019    import org.apache.camel.BinaryPredicate;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Predicate;
022    
023    /**
024     * A helper for doing {@link Predicate} assertions.
025     *
026     * @version 
027     */
028    public final class PredicateAssertHelper {
029    
030        private PredicateAssertHelper() {
031            // Utility class
032        }
033    
034        public static void assertMatches(Predicate predicate, String text, Exchange exchange) {
035            ObjectHelper.notNull(predicate, "predicate");
036            ObjectHelper.notNull(exchange, "exchange");
037    
038            if (predicate instanceof BinaryPredicate) {
039                // with binary evaluations as we can get more detailed information
040                BinaryPredicate eval = (BinaryPredicate) predicate;
041                String evalText = eval.matchesReturningFailureMessage(exchange);
042                if (evalText != null) {
043                    throw new AssertionError(text + predicate + " evaluated as: " + evalText + " on " + exchange);
044                }
045            } else {
046                doAssertMatches(predicate, text, exchange);
047            }
048        }
049    
050        private static void doAssertMatches(Predicate predicate, String text, Exchange exchange) {
051            if (!predicate.matches(exchange)) {
052                if (text == null) {
053                    throw new AssertionError(predicate + " on " + exchange);
054                } else {
055                    throw new AssertionError(text + predicate + " on " + exchange);
056                }
057            }
058        }
059    
060    }