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.converter;
018
019import org.apache.camel.Converter;
020import org.apache.camel.Exchange;
021import org.apache.camel.Expression;
022import org.apache.camel.Message;
023import org.apache.camel.Predicate;
024import 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
033public 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 expression) {
056        return new Processor() {
057            public void process(Exchange exchange) throws Exception {
058                Object answer = expression.evaluate(exchange, Object.class);
059                Message out = exchange.getOut();
060                out.copyFrom(exchange.getIn());
061                out.setBody(answer);
062            }
063        };
064    }
065
066}