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.test.junit4;
018    
019    import org.apache.camel.Exchange;
020    import org.apache.camel.Expression;
021    import org.apache.camel.spi.Language;
022    
023    /**
024     * A useful base class for testing the language plugins in Camel
025     */
026    public abstract class LanguageTestSupport extends ExchangeTestSupport {
027    
028        protected abstract String getLanguageName();
029    
030        /**
031         * Asserts that the given predicate expression evaluated on the current language and message
032         * exchange evaluates to true
033         */
034        protected void assertPredicate(String expression) {
035            assertPredicate(exchange, expression, true);
036        }
037    
038        /**
039         * Asserts that the given predicate expression evaluated on the current language and message
040         * exchange evaluates to false
041         */
042        protected void assertPredicateFails(String expression) {
043            assertPredicate(exchange, expression, false);
044        }
045    
046        /**
047         * Asserts that the given predicate expression evaluated on the current language and message
048         * exchange evaluates to the expected value
049         */
050        protected void assertPredicate(String expression, boolean expected) {
051            assertPredicate(exchange, expression, expected);
052        }
053    
054        protected void assertPredicate(Exchange exchange, String expression, boolean expected) {
055            assertPredicate(getLanguageName(), expression, exchange, expected);
056        }
057    
058    
059        /**
060         * Asserts that this language expression evaluates to the given value on the given exchange
061         */
062        protected void assertExpression(Exchange exchange, String expressionText, Object expectedValue) {
063            assertExpression(exchange, getLanguageName(), expressionText, expectedValue);
064        }
065    
066        /**
067         * Asserts that this language expression evaluates to the given value on the current exchange
068         */
069        protected void assertExpression(String expressionText, Object expectedValue) {
070            assertExpression(exchange, expressionText, expectedValue);
071        }
072    
073        /**
074         * Asserts that the expression evaluates to one of the two given values
075         */
076        protected void assertExpression(String expressionText, String expectedValue, String orThisExpectedValue) {
077            Language language = assertResolveLanguage(getLanguageName());
078    
079            Expression expression = language.createExpression(expressionText);
080            assertNotNull("No Expression could be created for text: " + expressionText + " language: " + language, expression);
081    
082            Object value;
083            if (expectedValue != null) {
084                value = expression.evaluate(exchange, expectedValue.getClass());
085            } else {
086                value = expression.evaluate(exchange, Object.class);
087            }
088    
089            log.debug("Evaluated expression: " + expression + " on exchange: " + exchange + " result: " + value);
090    
091            assertTrue("Expression: " + expression + " on Exchange: " + exchange,
092                       expectedValue.equals(value) || orThisExpectedValue.equals(value));
093        }
094    
095    }