001/* 002 * (C) Copyright 2011-2014 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Florent Guillaume 018 */ 019package org.nuxeo.ecm.core.blob.binary; 020 021import java.io.File; 022import java.io.FileInputStream; 023import java.io.IOException; 024import java.io.InputStream; 025 026import org.nuxeo.ecm.core.blob.BlobManager; 027import org.nuxeo.ecm.core.blob.BlobProvider; 028import org.nuxeo.runtime.api.Framework; 029 030/** 031 * Lazy Binary that fetches its remote stream on first access. 032 */ 033public class LazyBinary extends Binary { 034 035 private static final long serialVersionUID = 1L; 036 037 // transient to be Serializable 038 protected transient CachingBinaryManager cbm; 039 040 public LazyBinary(String digest, String repoName, CachingBinaryManager cbm) { 041 super(digest, repoName); 042 this.cbm = cbm; 043 } 044 045 // because the class is Serializable, re-acquire the CachingBinaryManager 046 protected CachingBinaryManager getCachingBinaryManager() { 047 if (cbm == null) { 048 if (blobProviderId == null) { 049 throw new UnsupportedOperationException("Cannot find binary manager, no blob provider id"); 050 } 051 BlobManager bm = Framework.getService(BlobManager.class); 052 BlobProvider bp = bm.getBlobProvider(blobProviderId); 053 cbm = (CachingBinaryManager) bp.getBinaryManager(); 054 } 055 return cbm; 056 } 057 058 @Override 059 public InputStream getStream() throws IOException { 060 File file = getFile(); 061 return file == null ? null : new FileInputStream(file); 062 } 063 064 @Override 065 public File getFile() { 066 try { 067 return getCachingBinaryManager().getFile(digest); 068 } catch (IOException e) { 069 throw new RuntimeException(e); 070 } 071 } 072 073}