org.spearce.egit.ui/src/org/spearce/egit/ui/internal/decorators/GitDocument.java

   1 /*******************************************************************************
   2  * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
   3  *
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * See LICENSE for the full license text, also available.
   7  *******************************************************************************/
   8 package org.spearce.egit.ui.internal.decorators;
   9
  10 import java.io.BufferedReader;
  11 import java.io.CharArrayWriter;
  12 import java.io.IOException;
  13 import java.io.InputStream;
  14 import java.io.InputStreamReader;
  15
  16 import org.eclipse.core.resources.IProject;
  17 import org.eclipse.core.resources.IResource;
  18 import org.eclipse.core.resources.IStorage;
  19 import org.eclipse.core.runtime.CoreException;
  20 import org.eclipse.jface.text.Document;
  21 import org.eclipse.team.core.RepositoryProvider;
  22 import org.eclipse.team.core.history.IFileHistory;
  23 import org.eclipse.team.core.history.IFileHistoryProvider;
  24 import org.eclipse.team.core.history.IFileRevision;
  25 import org.spearce.egit.core.GitProvider;
  26 import org.spearce.egit.core.project.RepositoryMapping;
  27 import org.spearce.egit.ui.Activator;
  28 import org.spearce.jgit.lib.IndexChangedEvent;
  29 import org.spearce.jgit.lib.RefsChangedEvent;
  30 import org.spearce.jgit.lib.Repository;
  31 import org.spearce.jgit.lib.RepositoryListener;
  32
  33 class GitDocument extends Document implements RepositoryListener {
  34         private final IResource resource;
  35
  36         static GitDocument create(IResource resource) throws IOException, CoreException {
  37                 GitDocument ret = null;
  38                 if (RepositoryProvider.getProvider(resource.getProject()) instanceof GitProvider) {
  39                         ret = new GitDocument(resource);
  40                         ret.populate();
  41                 }
  42                 return ret;
  43         }
  44
  45         private GitDocument(IResource resource) {
  46                 this.resource = resource;
  47         }
  48
  49         void populate() throws IOException, CoreException {
  50                 set("");
  51                 IProject project = resource.getProject();
  52                 RepositoryProvider provider = RepositoryProvider.getProvider(project);
  53                 getRepository().addRepositoryChangedListener(this);
  54                 IFileHistoryProvider fileHistoryProvider = provider
  55                                 .getFileHistoryProvider();
  56                 IFileHistory fileHistoryFor = fileHistoryProvider.getFileHistoryFor(
  57                                 resource, IFileHistoryProvider.SINGLE_REVISION, null);
  58                 IFileRevision[] revisions = fileHistoryFor.getFileRevisions();
  59                 if (revisions != null && revisions.length > 0) {
  60                         IFileRevision revision = revisions[0];
  61                         Activator.trace("(GitQuickDiffProvider) compareTo: "
  62                                         + revision.getContentIdentifier());
  63                         IStorage storage = revision.getStorage(null);
  64                         InputStream contents = storage.getContents();
  65                         BufferedReader in = new BufferedReader(new InputStreamReader(
  66                                         contents));
  67                         final int DEFAULT_FILE_SIZE = 15 * 1024;
  68
  69                         CharArrayWriter caw = new CharArrayWriter(DEFAULT_FILE_SIZE);
  70                         char[] readBuffer = new char[2048];
  71                         int n = in.read(readBuffer);
  72                         while (n > 0) {
  73                                 caw.write(readBuffer, 0, n);
  74                                 n = in.read(readBuffer);
  75                         }
  76                         String s = caw.toString();
  77                         set(s);
  78                         Activator.trace("(GitQuickDiffProvider) has reference doc, size=" + s.length() + " bytes");
  79                 } else {
  80                         Activator.trace("(GitQuickDiffProvider) no revision.");
  81                 }
  82         }
  83
  84         void dispose() {
  85                 getRepository().removeRepositoryChangedListener(this);
  86         }
  87
  88         public void refsChanged(final RefsChangedEvent e) {
  89                 try {
  90                         populate();
  91                 } catch (IOException e1) {
  92                         Activator.logError("Failed to refresh quickdiff", e1);
  93                 } catch (CoreException e1) {
  94                         Activator.logError("Failed to refresh quickdiff", e1);
  95                 }
  96         }
  97
  98         public void indexChanged(final IndexChangedEvent e) {
  99                 // Index not relevant at this moment
 100         }
 101
 102         private Repository getRepository() {
 103                 IProject project = resource.getProject();
 104                 RepositoryMapping mapping = RepositoryMapping.getMapping(project);
 105                 return mapping.getRepository();
 106         }
 107 }