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 */
017package org.apache.camel.util;
018
019import org.apache.camel.BinaryPredicate;
020import org.apache.camel.Exchange;
021import org.apache.camel.Predicate;
022
023/**
024 * A helper for doing {@link Predicate} assertions.
025 *
026 * @version 
027 */
028public 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}