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.IOException;
020    import java.io.InputStream;
021    import java.net.HttpURLConnection;
022    import java.net.URL;
023    import javax.jms.JMSException;
024    import org.apache.activemq.command.ActiveMQBlobMessage;
025    
026    /**
027     * A default implementation of {@link BlobDownloadStrategy} which uses the URL
028     * class to download files or streams from a remote URL
029     */
030    public class DefaultBlobDownloadStrategy extends DefaultStrategy implements BlobDownloadStrategy {
031    
032        public DefaultBlobDownloadStrategy(BlobTransferPolicy transferPolicy) {
033            super(transferPolicy);
034        }
035    
036        public InputStream getInputStream(ActiveMQBlobMessage message) throws IOException, JMSException {
037            URL value = message.getURL();
038            if (value == null) {
039                return null;
040            }
041            return value.openStream();
042        }
043    
044        public void deleteFile(ActiveMQBlobMessage message) throws IOException, JMSException {
045            URL url = createMessageURL(message);
046    
047            HttpURLConnection connection = (HttpURLConnection)url.openConnection();
048            connection.setRequestMethod("DELETE");
049            connection.connect();
050            connection.disconnect();
051    
052            if (!isSuccessfulCode(connection.getResponseCode())) {
053                throw new IOException("DELETE was not successful: " + connection.getResponseCode() + " "
054                                      + connection.getResponseMessage());
055            }
056        }
057    
058    }