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.language.groovy;
018    
019    import groovy.lang.Closure;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.impl.ExpressionSupport;
022    import org.apache.camel.model.ChoiceType;
023    import org.apache.camel.model.FilterType;
024    import org.apache.camel.model.ProcessorType;
025    
026    /**
027     * @version $Revision: 640731 $
028     */
029    public final class CamelGroovyMethods {
030        private CamelGroovyMethods() {
031            // Utility Class
032        }
033    
034        public static FilterType filter(ProcessorType self, Closure filter) {
035            return self.filter(toExpression(filter));
036        }
037    
038        public static ChoiceType when(ChoiceType self, Closure filter) {
039            return self.when(toExpression(filter));
040        }
041    
042        public static ExpressionSupport toExpression(final Closure filter) {
043            return new ExpressionSupport<Exchange>() {
044                protected String assertionFailureMessage(Exchange exchange) {
045                    return filter.toString();
046                }
047    
048                public Object evaluate(Exchange exchange) {
049                    return filter.call(exchange);
050                }
051    
052                @Override
053                public String toString() {
054                    return "Groovy[" + filter + "]";
055                }
056            };
057        }
058    
059    }