org.spearce.egit.core/src/org/spearce/egit/core/GitQuickDiffProvider.java

   1 /*
   2  *  Copyright (C) 2006  Robin Rosenberg
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Lesser General Public
   6  *  License, version 2.1, as published by the Free Software Foundation.
   7  *
   8  *  This library is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  *  Lesser General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU Lesser General Public
  14  *  License along with this library; if not, write to the Free Software
  15  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  16  */
  17 package org.spearce.egit.core;
  18
  19 import java.io.BufferedReader;
  20 import java.io.CharArrayWriter;
  21 import java.io.IOException;
  22 import java.io.InputStream;
  23 import java.io.InputStreamReader;
  24
  25 import org.eclipse.core.resources.IFile;
  26 import org.eclipse.core.resources.IStorage;
  27 import org.eclipse.core.runtime.CoreException;
  28 import org.eclipse.core.runtime.IProgressMonitor;
  29 import org.eclipse.jface.text.Document;
  30 import org.eclipse.jface.text.IDocument;
  31 import org.eclipse.team.core.RepositoryProvider;
  32 import org.eclipse.team.core.history.IFileHistory;
  33 import org.eclipse.team.core.history.IFileHistoryProvider;
  34 import org.eclipse.team.core.history.IFileRevision;
  35 import org.eclipse.ui.IEditorInput;
  36 import org.eclipse.ui.ide.ResourceUtil;
  37 import org.eclipse.ui.texteditor.ITextEditor;
  38 import org.eclipse.ui.texteditor.quickdiff.IQuickDiffReferenceProvider;
  39
  40 public class GitQuickDiffProvider implements IQuickDiffReferenceProvider {
  41
  42     private String id;
  43
  44     private Document document;
  45
  46     private IFile file;
  47
  48     public void dispose() {
  49         // No resources to free
  50     }
  51
  52     public String getId() {
  53         return id;
  54     }
  55
  56     public IDocument getReference(IProgressMonitor monitor)
  57             throws CoreException {
  58         System.out.println("GitQuickDiffProvider.getReference()=" + document);
  59         document = new Document();
  60         System.out.println("GitQuickDiffProvider.getReference() file=" + file);
  61
  62         RepositoryProvider provider = RepositoryProvider
  63                 .getProvider(file.getProject());
  64         if (provider != null) {
  65             try {
  66                 IFileHistoryProvider fileHistoryProvider = provider
  67                         .getFileHistoryProvider();
  68                 IFileHistory fileHistoryFor = fileHistoryProvider
  69                         .getFileHistoryFor(file,
  70                                 IFileHistoryProvider.SINGLE_REVISION, null);
  71                 IFileRevision[] revisions = fileHistoryFor.getFileRevisions();
  72                 if (revisions != null && revisions.length > 0) {
  73                     IFileRevision revision = revisions[0];
  74                     System.out.println("Comparing with "
  75                             + revision.getContentIdentifier());
  76                     IStorage storage = revision.getStorage(null);
  77                     InputStream contents = storage.getContents();
  78                     BufferedReader in = new BufferedReader(
  79                             new InputStreamReader(contents));
  80                     final int DEFAULT_FILE_SIZE = 15 * 1024;
  81
  82                     CharArrayWriter caw = new CharArrayWriter(DEFAULT_FILE_SIZE);
  83                     char[] readBuffer = new char[2048];
  84                     int n = in.read(readBuffer);
  85                     while (n > 0) {
  86                         caw.write(readBuffer, 0, n);
  87                         n = in.read(readBuffer);
  88                     }
  89                     String s = caw.toString();
  90                     System.out.println("GitQuickDiffProvider: got data:" + s);
  91                     document.set(s);
  92                 } else {
  93                     document.set("");
  94                     System.out
  95                             .println("GitQuickDiffProvider: got no data (new file?):");
  96                 }
  97             } catch (CoreException e) {
  98                 // TODO Auto-generated catch block
  99                 e.printStackTrace();
 100             } catch (IOException e) {
 101                 // TODO Auto-generated catch block
 102                 e.printStackTrace();
 103             }
 104             return document;
 105         } else {
 106             System.out.println("GitQuickDiffProvider: no provider found for "
 107                     + file);
 108             return null;
 109         }
 110     }
 111
 112     public boolean isEnabled() {
 113         return true;
 114     }
 115
 116     public void setActiveEditor(ITextEditor editor) {
 117         System.out.println("GitQuickDiffProvider.setActiveEdtor()");
 118         IEditorInput editorInput = editor.getEditorInput();
 119         file = ResourceUtil.getFile(editorInput);
 120     }
 121
 122     public void setId(String id) {
 123         this.id = id;
 124     }
 125
 126 }