org.spearce.egit.core/src/org/spearce/egit/core/internal/storage/CommitFileRevision.java

   1 /*******************************************************************************
   2  * Copyright (C) 2008, 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  * See LICENSE for the full license text, also available.
   8  *******************************************************************************/
   9 package org.spearce.egit.core.internal.storage;
  10
  11 import java.io.IOException;
  12 import java.util.ArrayList;
  13 import java.util.Collection;
  14 import java.util.Map;
  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.IProgressMonitor;
  21 import org.eclipse.core.runtime.Path;
  22 import org.eclipse.team.core.history.IFileRevision;
  23 import org.eclipse.team.core.history.ITag;
  24 import org.spearce.egit.core.GitTag;
  25 import org.spearce.jgit.lib.AnyObjectId;
  26 import org.spearce.jgit.lib.ObjectId;
  27 import org.spearce.jgit.lib.PersonIdent;
  28 import org.spearce.jgit.lib.Ref;
  29 import org.spearce.jgit.lib.Repository;
  30 import org.spearce.jgit.revwalk.RevCommit;
  31 import org.spearce.jgit.treewalk.TreeWalk;
  32
  33 /**
  34  * An {@link IFileRevision} for a version of a specified resource in the
  35  * specified commit (revision).
  36  */
  37 class CommitFileRevision extends GitFileRevision {
  38         private final Repository db;
  39
  40         private final RevCommit commit;
  41
  42         private final PersonIdent author;
  43
  44         private final String path;
  45
  46         private ObjectId blobId;
  47
  48         CommitFileRevision(final Repository repo, final RevCommit rc,
  49                         final String fileName) {
  50                 this(repo, rc, fileName, null);
  51         }
  52
  53         CommitFileRevision(final Repository repo, final RevCommit rc,
  54                         final String fileName, final ObjectId blob) {
  55                 super(fileName);
  56                 db = repo;
  57                 commit = rc;
  58                 author = rc.getAuthorIdent();
  59                 path = fileName;
  60                 blobId = blob;
  61         }
  62
  63         String getGitPath() {
  64                 return path;
  65         }
  66
  67         public IStorage getStorage(final IProgressMonitor monitor)
  68                         throws CoreException {
  69                 if (blobId == null)
  70                         blobId = locateBlobObjectId();
  71                 return new BlobStorage(db, path, blobId);
  72         }
  73
  74         public long getTimestamp() {
  75                 return author != null ? author.getWhen().getTime() : 0;
  76         }
  77
  78         public String getContentIdentifier() {
  79                 return commit.getId().name();
  80         }
  81
  82         public String getAuthor() {
  83                 return author != null ? author.getName() : null;
  84         }
  85
  86         public String getComment() {
  87                 return commit.getShortMessage();
  88         }
  89
  90         public String toString() {
  91                 return commit.getId() + ":" + path;
  92         }
  93
  94         public ITag[] getTags() {
  95                 final Collection<GitTag> ret = new ArrayList<GitTag>();
  96                 for (final Map.Entry<String, Ref> tag : db.getTags().entrySet()) {
  97                         final ObjectId ref = tag.getValue().getPeeledObjectId();
  98                         if (ref == null)
  99                                 continue;
 100                         if (!AnyObjectId.equals(ref, commit))
 101                                 continue;
 102                         ret.add(new GitTag(tag.getKey()));
 103                 }
 104                 return ret.toArray(new ITag[ret.size()]);
 105         }
 106
 107         /**
 108          * Get the commit that introduced this file revision.
 109          *
 110          * @return the commit we most recently noticed this file in.
 111          */
 112         public RevCommit getRevCommit() {
 113                 return commit;
 114         }
 115
 116         private ObjectId locateBlobObjectId() throws CoreException {
 117                 try {
 118                         final TreeWalk w = TreeWalk.forPath(db, path, commit.getTree());
 119                         if (w == null)
 120                                 throw new ResourceException(IResourceStatus.FAILED_READ_LOCAL,
 121                                                 Path.fromPortableString(path), "Path not in "
 122                                                                 + commit.getId() + ".", null);
 123                         return w.getObjectId(0);
 124                 } catch (IOException e) {
 125                         throw new ResourceException(IResourceStatus.FAILED_READ_LOCAL, Path
 126                                         .fromPortableString(path), "IO error looking up path in "
 127                                         + commit.getId() + ".", e);
 128                 }
 129         }
 130 }