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 javax.jms.JMSException;
022    import org.apache.activemq.command.ActiveMQBlobMessage;
023    
024    
025    /**
026     * Mediator for Blob Download
027     */
028    public class BlobDownloader {
029    
030        private final BlobTransferPolicy blobTransferPolicy;
031        
032        public BlobDownloader(BlobTransferPolicy transferPolicy) {
033            // need to do a defensive copy
034            this.blobTransferPolicy = transferPolicy.copy();
035        }
036        
037        public InputStream getInputStream(ActiveMQBlobMessage message) throws IOException, JMSException {
038            return getStrategy().getInputStream(message);
039        }
040        
041        public void deleteFile(ActiveMQBlobMessage message) throws IOException, JMSException {
042            getStrategy().deleteFile(message);
043        }
044        
045        public BlobTransferPolicy getBlobTransferPolicy() {
046            return blobTransferPolicy;
047        }
048        
049        public BlobDownloadStrategy getStrategy() {
050            return getBlobTransferPolicy().getDownloadStrategy();
051        }
052    }