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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.team.internal.ccvs.ui;
import java.io.BufferedReader;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.team.core.sync.IRemoteResource;
import org.eclipse.team.internal.ccvs.core.CVSException;
import org.eclipse.team.internal.ccvs.core.resources.CVSWorkspaceRoot;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.editors.quickdiff.IQuickDiffProviderImplementation;
import org.eclipse.ui.editors.text.StorageDocumentProvider;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.ui.texteditor.ITextEditor;
/**
* Quick and dirty cvs reference provider. No background, no hourglass cursor, no nothing.
* @since 3.0
*/
public class RemoteRevisionQuickDiffProvider implements IQuickDiffProviderImplementation {
private boolean fDocumentRead= false;
private ITextEditor fEditor= null;
private IDocument fReference= null;
private String fId;
/*
* @see org.eclipse.test.quickdiff.DocumentLineDiffer.IQuickDiffReferenceProvider#getReference()
*/
public IDocument getReference() {
if (!fDocumentRead)
readDocument();
if (fDocumentRead)
return fReference;
else
return null;
}
/**
* Intitializes the given document with the given stream using the given encoding.
*
* @param document the document to be initialized
* @param contentStream the stream which delivers the document content
* @param encoding the character encoding for reading the given stream
* @exception CoreException if the given stream can not be read
*/
private static void setDocumentContent(IDocument document, InputStream contentStream, String encoding) throws CoreException {
Reader in= null;
try {
final int DEFAULT_FILE_SIZE= 15 * 1024;
in= new BufferedReader(new InputStreamReader(contentStream, encoding), DEFAULT_FILE_SIZE);
CharArrayWriter caw= new CharArrayWriter(DEFAULT_FILE_SIZE);
char[] readBuffer= new char[2048];
int n= in.read(readBuffer);
while (n > 0) {
caw.write(readBuffer, 0, n);
n= in.read(readBuffer);
}
document.set(caw.toString());
} catch (IOException x) {
String msg= x.getMessage() == null ? "" : x.getMessage(); //$NON-NLS-1$
IStatus s= new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID, IStatus.OK, msg, x);
throw new CoreException(s);
} finally {
if (in != null) {
try {
in.close();
} catch (IOException x) {
}
}
}
}
private void readDocument() {
// TODO this is quick&dirty
if (!initialized())
return;
fDocumentRead= false;
IEditorInput input= fEditor.getEditorInput();
if (fReference == null)
fReference= new Document();
if (input instanceof IFileEditorInput) {
IFile file= ((IFileEditorInput)input).getFile();
IRemoteResource remote= null;
try {
remote= CVSWorkspaceRoot.getRemoteResourceFor(file);
} catch (CVSException e) {
return;
}
if (remote == null)
return;
IDocumentProvider provider= fEditor.getDocumentProvider();
if (provider instanceof StorageDocumentProvider) {
StorageDocumentProvider sProvider= (StorageDocumentProvider)provider;
String encoding= sProvider.getEncoding(input);
if (encoding == null)
encoding= sProvider.getDefaultEncoding();
try {
InputStream stream= remote.getContents(new NullProgressMonitor());
if (stream == null)
return;
setDocumentContent(fReference, stream, encoding);
} catch (CoreException e1) {
// TODO Auto-generated catch block
MessageDialog.openError(fEditor.getSite().getShell(), "CoreException", "Error when retrieving remote version");
return;
}
}
}
fDocumentRead= true;
}
private boolean initialized() {
return fEditor != null;
}
public void setActiveEditor(ITextEditor targetEditor) {
if (targetEditor != fEditor) {
dispose();
fEditor= targetEditor;
}
}
/*
* @see org.eclipse.quickdiff.QuickDiffTestPlugin.IQuickDiffProviderImplementation#isEnabled()
*/
public boolean isEnabled() {
if (!initialized())
return false;
IEditorInput input= fEditor.getEditorInput();
if (input instanceof IFileEditorInput) {
IFile file= ((IFileEditorInput)input).getFile();
try {
return CVSWorkspaceRoot.isSharedWithCVS(file);
} catch (CVSException e) {
// TODO: handle exception
e.printStackTrace();
}
}
return false;
}
/*
* @see org.eclipse.jface.text.source.diff.DocumentLineDiffer.IQuickDiffReferenceProvider#dispose()
*/
public void dispose() {
fReference= null;
fDocumentRead= false;
}
/*
* @see org.eclipse.quickdiff.QuickDiffTestPlugin.IQuickDiffProviderImplementation#setId(java.lang.String)
*/
public void setId(String id) {
fId= id;
}
/*
* @see org.eclipse.jface.text.source.diff.DocumentLineDiffer.IQuickDiffReferenceProvider#getId()
*/
public String getId() {
return fId;
}
}
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