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.jgit.errors.IncorrectObjectTypeException;
  23 import org.eclipse.jgit.lib.Constants;
  24 import org.eclipse.jgit.lib.ObjectId;
  25 import org.eclipse.jgit.lib.ObjectLoader;
  26 import org.eclipse.jgit.lib.Repository;
  27
  28 /** Accesses a blob from Git. */
  29 class BlobStorage implements IStorage {
  30         private final Repository db;
  31
  32         private final String path;
  33
  34         private final ObjectId blobId;
  35
  36         BlobStorage(final Repository repository, final String fileName,
  37                         final ObjectId blob) {
  38                 db = repository;
  39                 path = fileName;
  40                 blobId = blob;
  41         }
  42
  43         public InputStream getContents() throws CoreException {
  44                 try {
  45                         return open();
  46                 } catch (IOException e) {
  47                         throw new ResourceException(IResourceStatus.FAILED_READ_LOCAL,
  48                                         getFullPath(), "IO error reading Git blob " + blobId + ".",
  49                                         e);
  50                 }
  51         }
  52
  53         private InputStream open() throws IOException, ResourceException,
  54                         IncorrectObjectTypeException {
  55                 final ObjectLoader reader = db.openBlob(blobId);
  56                 if (reader == null)
  57                         throw new ResourceException(IResourceStatus.FAILED_READ_LOCAL,
  58                                         getFullPath(), "Git blob " + blobId + " not found.", null);
  59                 final byte[] data = reader.getBytes();
  60                 if (reader.getType() != Constants.OBJ_BLOB)
  61                         throw new IncorrectObjectTypeException(blobId, Constants.TYPE_BLOB);
  62                 return new ByteArrayInputStream(data);
  63         }
  64
  65         public IPath getFullPath() {
  66                 return Path.fromPortableString(path);
  67         }
  68
  69         public String getName() {
  70                 final int last = path.lastIndexOf('/');
  71                 return last >= 0 ? path.substring(last + 1) : path;
  72         }
  73
  74         public boolean isReadOnly() {
  75                 return true;
  76         }
  77
  78         public Object getAdapter(final Class adapter) {
  79                 return null;
  80         }
  81 }