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.commons.logging.Log;
021    import org.apache.commons.logging.LogFactory;
022    
023    import java.io.*;
024    import java.net.URL;
025    
026    /**
027     * Some core java.io based <a
028     * href="http://activemq.apache.org/camel/type-converter.html">Type Converters</a>
029     * 
030     * @version $Revision: 564167 $
031     */
032    @Converter
033    public class IOConverter {
034        private static final transient Log LOG = LogFactory.getLog(IOConverter.class);
035    
036        /**
037         * Utility classes should not have a public constructor.
038         */
039        private IOConverter() {        
040        }
041    
042        @Converter
043        public static InputStream toInputStream(URL url) throws IOException {
044            return url.openStream();
045        }
046    
047        @Converter
048        public static InputStream toInputStream(File file) throws FileNotFoundException {
049            return new BufferedInputStream(new FileInputStream(file));
050        }
051    
052        @Converter
053        public static BufferedReader toReader(File file) throws FileNotFoundException {
054            return new BufferedReader(new FileReader(file));
055        }
056    
057        @Converter
058        public static File toFile(String name) throws FileNotFoundException {
059            return new File(name);
060        }
061    
062        @Converter
063        public static OutputStream toOutputStream(File file) throws FileNotFoundException {
064            return new BufferedOutputStream(new FileOutputStream(file));
065        }
066    
067        @Converter
068        public static BufferedWriter toWriter(File file) throws IOException {
069            return new BufferedWriter(new FileWriter(file));
070        }
071    
072        @Converter
073        public static Reader toReader(InputStream in) throws FileNotFoundException {
074            return new InputStreamReader(in);
075        }
076    
077        @Converter
078        public static Writer toWriter(OutputStream out) throws FileNotFoundException {
079            return new OutputStreamWriter(out);
080        }
081    
082        @Converter
083        public static StringReader toReader(String text) {
084            // TODO could we automatically find this?
085            return new StringReader(text);
086        }
087    
088        @Converter
089        public static InputStream toInputStream(String text) {
090            return toInputStream(text.getBytes());
091        }
092    
093        @Converter
094        public static byte[] toByteArray(String text) {
095            // TODO could we automatically find this?
096            return text.getBytes();
097        }
098    
099        @Converter
100        public static String toString(byte[] data) {
101            return new String(data);
102        }
103    
104        @Converter
105        public static String toString(File file) throws IOException {
106            return toString(toReader(file));
107        }
108    
109        @Converter
110        public static String toString(URL url) throws IOException {
111            return toString(toInputStream(url));
112        }
113    
114        @Converter
115        public static String toString(Reader reader) throws IOException {
116            if (reader instanceof BufferedReader) {
117                return toString((BufferedReader)reader);
118            } else {
119                return toString(new BufferedReader(reader));
120            }
121        }
122    
123        @Converter
124        public static String toString(BufferedReader reader) throws IOException {
125            if (reader == null) {
126                return null;
127            }
128            try {
129                StringBuilder builder = new StringBuilder();
130                boolean first = true;
131                while (true) {
132                    String line = reader.readLine();
133                    if (line == null) {
134                        return builder.toString();
135                    }
136                    if (first) {
137                        first = false;
138                    } else {
139                        builder.append("\n");
140                    }
141                    builder.append(line);
142                }
143            } finally {
144                try {
145                    reader.close();
146                } catch (IOException e) {
147                    LOG.warn("Failed to close stream: " + e, e);
148                }
149            }
150        }
151    
152        @Converter
153        public static String toString(InputStream in) throws IOException {
154            return toString(toReader(in));
155        }
156    
157        @Converter
158        public static InputStream toInputStream(byte[] data) {
159            return new ByteArrayInputStream(data);
160        }
161    
162    }