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.activemq.blob;
018    
019    import java.io.FilterInputStream;
020    import java.io.IOException;
021    import java.io.InputStream;
022    import java.net.MalformedURLException;
023    
024    import javax.jms.JMSException;
025    
026    import org.apache.activemq.command.ActiveMQBlobMessage;
027    import org.apache.commons.net.ftp.FTPClient;
028    
029    /**
030     * A FTP implementation for {@link BlobDownloadStrategy}.
031     */
032    public class FTPBlobDownloadStrategy extends FTPStrategy implements BlobDownloadStrategy {
033    
034        public FTPBlobDownloadStrategy(BlobTransferPolicy transferPolicy) throws MalformedURLException {
035            super(transferPolicy);
036        }
037    
038        public InputStream getInputStream(ActiveMQBlobMessage message) throws IOException, JMSException {
039            url = message.getURL();
040            final FTPClient ftp = createFTP();
041            String path = url.getPath();
042            String workingDir = path.substring(0, path.lastIndexOf("/"));
043            String file = path.substring(path.lastIndexOf("/") + 1);
044            ftp.changeWorkingDirectory(workingDir);
045            ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
046    
047            InputStream input = new FilterInputStream(ftp.retrieveFileStream(file)) {
048    
049                public void close() throws IOException {
050                    in.close();
051                    ftp.quit();
052                    ftp.disconnect();
053                }
054            };
055    
056            return input;
057        }
058    
059        public void deleteFile(ActiveMQBlobMessage message) throws IOException, JMSException {
060            url = message.getURL();
061            final FTPClient ftp = createFTP();
062    
063            String path = url.getPath();
064            try {
065                if (!ftp.deleteFile(path)) {
066                    throw new JMSException("Delete file failed: " + ftp.getReplyString());
067                }
068            } finally {
069                ftp.quit();
070                ftp.disconnect();
071            }
072    
073        }
074    
075    }