org.eclipse.egit.core/src/org/eclipse/egit/core/internal/storage/BlobStorage.java

   1 /*******************************************************************************
   2  * Copyright (C) 2006, Robin Rosenberg <robin.rosenberg@dewire.com>
   3  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   4  *
   5  * All rights reserved. This program and the accompanying materials
   6  * are made available under the terms of the Eclipse Public License v1.0
   7  * which accompanies this distribution, and is available at
   8  * http://www.eclipse.org/legal/epl-v10.html
   9  *******************************************************************************/
  10 package org.eclipse.egit.core.internal.storage;
  11
  12 import java.io.ByteArrayInputStream;
  13 import java.io.IOException;
  14 import java.io.InputStream;
  15
  16 import org.eclipse.core.internal.resources.ResourceException;
  17 import org.eclipse.core.resources.IResourceStatus;
  18 import org.eclipse.core.resources.IStorage;
  19 import org.eclipse.core.runtime.CoreException;
  20 import org.eclipse.core.runtime.IPath;
  21 import org.eclipse.core.runtime.Path;
  22 import org.eclipse.egit.core.CoreText;
  23 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
  24 import org.eclipse.jgit.lib.Constants;
  25 import org.eclipse.jgit.lib.ObjectId;
  26 import org.eclipse.jgit.lib.ObjectLoader;
  27 import org.eclipse.jgit.lib.Repository;
  28 import org.eclipse.osgi.util.NLS;
  29
  30 /** Accesses a blob from Git. */
  31 class BlobStorage implements IStorage {
  32         protected final Repository db;
  33
  34         private final String path;
  35
  36         private final ObjectId blobId;
  37
  38         BlobStorage(final Repository repository, final String fileName,
  39                         final ObjectId blob) {
  40                 db = repository;
  41                 path = fileName;
  42                 blobId = blob;
  43         }
  44
  45         public InputStream getContents() throws CoreException {
  46                 try {
  47                         return open();
  48                 } catch (IOException e) {
  49                         throw new ResourceException(IResourceStatus.FAILED_READ_LOCAL,
  50                                         getFullPath(), NLS.bind(
  51                                                         CoreText.BlobStorage_errorReadingBlob, blobId), e);
  52                 }
  53         }
  54
  55         private InputStream open() throws IOException, ResourceException,
  56                         IncorrectObjectTypeException {
  57                 final ObjectLoader reader = db.openBlob(blobId);
  58                 if (reader == null)
  59                         throw new ResourceException(IResourceStatus.FAILED_READ_LOCAL,
  60                                         getFullPath(), NLS.bind(CoreText.BlobStorage_blobNotFound,
  61                                                         blobId), null);
  62                 final byte[] data = reader.getBytes();
  63                 if (reader.getType() != Constants.OBJ_BLOB)
  64                         throw new IncorrectObjectTypeException(blobId, Constants.TYPE_BLOB);
  65                 return new ByteArrayInputStream(data);
  66         }
  67
  68         public IPath getFullPath() {
  69                 return Path.fromPortableString(path);
  70         }
  71
  72         public String getName() {
  73                 final int last = path.lastIndexOf('/');
  74                 return last >= 0 ? path.substring(last + 1) : path;
  75         }
  76
  77         public boolean isReadOnly() {
  78                 return true;
  79         }
  80
  81         public Object getAdapter(final Class adapter) {
  82                 return null;
  83         }
  84 }