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.impl;
018    
019    import java.io.IOException;
020    import java.io.InputStream;
021    import java.io.OutputStream;
022    
023    import org.apache.camel.Exchange;
024    import org.apache.camel.spi.DataFormat;
025    import org.apache.camel.util.ExchangeHelper;
026    
027    /**
028     * The text based <a href="http://camel.apache.org/data-format.html">data format</a> supporting
029     * charset encoding.
030     *
031     * @version 
032     */
033    public class StringDataFormat implements DataFormat {
034    
035        private final String charset;
036    
037        public StringDataFormat(String charset) {
038            this.charset = charset;
039        }
040    
041        public void marshal(Exchange exchange, Object graph, OutputStream stream) throws IOException {
042            String text = ExchangeHelper.convertToType(exchange, String.class, graph);
043    
044            byte[] bytes;
045            if (charset != null) {
046                bytes = text.getBytes(charset);
047            } else {
048                bytes = text.getBytes();
049            }
050            stream.write(bytes);
051        }
052    
053        public Object unmarshal(Exchange exchange, InputStream stream) throws IOException {
054            byte[] bytes = ExchangeHelper.convertToType(exchange, byte[].class, stream);
055    
056            String answer;
057            if (charset != null) {
058                answer = new String(bytes, charset);
059            } else {
060                answer = new String(bytes);
061            }
062    
063            return answer;
064        }
065        
066    }