/*******************************************************************************
* Copyright (c) 2007, 2016 Red Hat, Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Red Hat - initial API and implementation
*******************************************************************************/
package org.eclipse.linuxtools.internal.rpm.ui.editor;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.URIUtil;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.rules.FastPartitioner;
import org.eclipse.linuxtools.internal.rpm.ui.editor.scanners.SpecfilePartitionScanner;
import org.eclipse.ui.IURIEditorInput;
import org.eclipse.ui.editors.text.TextFileDocumentProvider;
import org.eclipse.ui.ide.FileStoreEditorInput;
public class SpecfileDocumentProvider extends TextFileDocumentProvider {
private int originalLength;
private void setDocumentLength(Object element) {
IDocument doc = getDocument(element);
if (doc == null) {
originalLength = 0;
} else {
originalLength = doc.getLength();
}
}
@Override
public IDocument getDocument(Object element) {
IDocument document = super.getDocument(element);
if (document != null && document.getDocumentPartitioner() == null) {
FastPartitioner partitioner = new FastPartitioner(new SpecfilePartitionScanner(),
SpecfilePartitionScanner.SPEC_PARTITION_TYPES);
partitioner.connect(document, false);
document.setDocumentPartitioner(partitioner);
}
return document;
}
@Override
public void connect(Object element) throws CoreException {
super.connect(element);
setDocumentLength(element);
}
@Override
public boolean canSaveDocument(Object element) {
if (element instanceof FileStoreEditorInput) {
FileStoreEditorInput fei = (FileStoreEditorInput) element;
IDocument doc = getDocument(element);
if (!super.canSaveDocument(element)) {
return false;
}
if (doc.getLength() != originalLength) {
return true;
}
URI uri = fei.getURI();
File f = URIUtil.toFile(uri);
if (originalLength != 0) {
try (BufferedReader input = new BufferedReader(new FileReader(f))) {
boolean finished = false;
char[] buffer = new char[100];
int curoffset = 0;
while (!finished) {
int len = input.read(buffer);
if (len <= 0) {
break;
}
String origbytes = new String(buffer, 0, len);
String curbytes = doc.get(curoffset, len);
if (!curbytes.equals(origbytes)) {
return true;
}
curoffset += len;
}
resetDocument(element);
return false;
} catch (IOException | CoreException | BadLocationException e) {
return true;
}
}
}
return super.canSaveDocument(element);
}
@Override
protected DocumentProviderOperation createSaveOperation(final Object element, final IDocument document,
final boolean overwrite) throws CoreException {
final DocumentProviderOperation saveOperation = super.createSaveOperation(element, document, overwrite);
if (element instanceof IURIEditorInput) {
return new DocumentProviderOperation() {
@Override
public void execute(IProgressMonitor monitor) {
}
@Override
public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
saveOperation.run(monitor);
// Here's where we sneak in resetting the original document
// length
setDocumentLength(element);
}
@Override
public ISchedulingRule getSchedulingRule() {
return saveOperation.getSchedulingRule();
}
};
}
return saveOperation;
}
}