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 */
017package org.apache.activemq.blob;
018
019import java.io.IOException;
020import java.io.InputStream;
021import java.net.HttpURLConnection;
022import java.net.URL;
023import javax.jms.JMSException;
024import 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 */
030public 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}