/*
* Copyright (c) 2013 TMate Software Ltd
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* For information on how to redistribute this software under
* the terms of a license other than GNU General Public License
* contact TMate Software at support@hg4j.com
*/
package org.tmatesoft.hg.internal;
import org.tmatesoft.hg.internal.diff.DiffHelper;
import org.tmatesoft.hg.internal.diff.DiffHelper.DeltaInspector;
import org.tmatesoft.hg.internal.diff.DiffHelper.LineSequence;
class GeneratePatchInspector extends DeltaInspector<LineSequence> {
private final Patch deltaCollector;
GeneratePatchInspector(Patch p) {
assert p != null;
deltaCollector = p;
}
public static Patch delta(byte[] prev, byte[] content) {
Patch rv = new Patch();
DiffHelper<LineSequence> pg = new DiffHelper<LineSequence>();
pg.init(new LineSequence(prev).splitByNewlines(), new LineSequence(content).splitByNewlines());
pg.findMatchingBlocks(new GeneratePatchInspector(rv));
return rv;
}
@Override
protected void changed(int s1From, int s1To, int s2From, int s2To) {
int from = seq1.chunk(s1From).getOffset();
int to = seq1.chunk(s1To).getOffset();
byte[] data = seq2.data(s2From, s2To);
deltaCollector.add(from, to, data);
}
@Override
protected void deleted(int s2DeletionPoint, int s1From, int s1To) {
int from = seq1.chunk(s1From).getOffset();
int to = seq1.chunk(s1To).getOffset();
deltaCollector.add(from, to, new byte[0]);
}
@Override
protected void added(int s1InsertPoint, int s2From, int s2To) {
int insPoint = seq1.chunk(s1InsertPoint).getOffset();
byte[] data = seq2.data(s2From, s2To);
deltaCollector.add(insPoint, insPoint, data);
}
}