001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *  http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    
020    package javax.activation;
021    
022    import java.io.IOException;
023    import java.io.InputStream;
024    import java.io.OutputStream;
025    import java.net.URL;
026    import java.net.URLConnection;
027    
028    /**
029     * @version $Rev: 467742 $ $Date: 2006-10-25 21:30:38 +0200 (Wed, 25 Oct 2006) $
030     */
031    public class URLDataSource implements DataSource {
032        private final static String DEFAULT_CONTENT_TYPE = "application/octet-stream";
033    
034        private final URL url;
035    
036        /**
037         * Creates a URLDataSource from a URL object.
038         */
039        public URLDataSource(URL url) {
040            this.url = url;
041        }
042    
043        /**
044         * Returns the value of the URL content-type header field.
045         * This method calls URL.openConnection() to obtain a connection
046         * from which to obtain the content type. If this fails or
047         * a getContentType() returns null then "application/octet-stream"
048         * is returned.
049         */
050        public String getContentType() {
051            try {
052                URLConnection connection = url.openConnection();
053                String type = connection.getContentType();
054                return type == null ? DEFAULT_CONTENT_TYPE : type;
055            } catch (IOException e) {
056                return DEFAULT_CONTENT_TYPE;
057            }
058        }
059    
060        /**
061         * Returns the file name of the URL object.
062         * @return the name as returned by URL.getFile()
063         */
064        public String getName() {
065            return url.getFile();
066        }
067    
068        /**
069         * Returns an InputStream obtained from the URL.
070         * @return the InputStream from URL.openStream()
071         */
072        public InputStream getInputStream() throws IOException {
073            return url.openStream();
074        }
075    
076        /**
077         * Returns an OutputStream obtained from the URL.
078         */
079        public OutputStream getOutputStream() throws IOException {
080            URLConnection connection = url.openConnection();
081            connection.setDoOutput(true);
082            return connection.getOutputStream();
083        }
084    
085        /**
086         * Returns the URL of the data source.
087         */
088        public URL getURL() {
089            return url;
090        }
091    }