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.converter;
018    
019    import org.apache.camel.Converter;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Expression;
022    import org.apache.camel.Message;
023    import org.apache.camel.Predicate;
024    import org.apache.camel.Processor;
025    
026    /**
027     * Some useful converters for Camel APIs such as to convert a {@link Predicate} or {@link Expression}
028     * to a {@link Processor}
029     *
030     * @version 
031     */
032    @Converter
033    public final class CamelConverter {
034    
035        /**
036         * Utility classes should not have a public constructor.
037         */
038        private CamelConverter() {
039        }
040    
041        @Converter
042        public static Processor toProcessor(final Predicate predicate) {
043            return new Processor() {
044                public void process(Exchange exchange) throws Exception {
045                    boolean answer = predicate.matches(exchange);
046                    Message out = exchange.getOut();
047                    out.copyFrom(exchange.getIn());
048                    out.setBody(answer);
049                }
050            };
051    
052        }
053    
054        @Converter
055        public static Processor toProcessor(final Expression expresion) {
056            return new Processor() {
057                public void process(Exchange exchange) throws Exception {
058                    Object answer = expresion.evaluate(exchange, Object.class);
059                    Message out = exchange.getOut();
060                    out.copyFrom(exchange.getIn());
061                    out.setBody(answer);
062                }
063            };
064        }
065    
066    }