tikhomirov@544: /*
tikhomirov@544:  * Copyright (c) 2013 TMate Software Ltd
tikhomirov@544:  *  
tikhomirov@544:  * This program is free software; you can redistribute it and/or modify
tikhomirov@544:  * it under the terms of the GNU General Public License as published by
tikhomirov@544:  * the Free Software Foundation; version 2 of the License.
tikhomirov@544:  *
tikhomirov@544:  * This program is distributed in the hope that it will be useful,
tikhomirov@544:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@544:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@544:  * GNU General Public License for more details.
tikhomirov@544:  *
tikhomirov@544:  * For information on how to redistribute this software under
tikhomirov@544:  * the terms of a license other than GNU General Public License
tikhomirov@544:  * contact TMate Software at support@hg4j.com
tikhomirov@544:  */
tikhomirov@544: package org.tmatesoft.hg.internal;
tikhomirov@544: 
tikhomirov@551: import org.tmatesoft.hg.internal.DiffHelper.DeltaInspector;
tikhomirov@551: import org.tmatesoft.hg.internal.DiffHelper.LineSequence;
tikhomirov@544: 
tikhomirov@544: class GeneratePatchInspector extends DeltaInspector<LineSequence> {
tikhomirov@544: 	private final Patch deltaCollector;
tikhomirov@544: 	
tikhomirov@544: 	GeneratePatchInspector(Patch p) {
tikhomirov@544: 		assert p != null;
tikhomirov@544: 		deltaCollector = p;
tikhomirov@544: 	}
tikhomirov@544: 	
tikhomirov@544: 	public static Patch delta(byte[] prev, byte[] content) {
tikhomirov@544: 		Patch rv = new Patch();
tikhomirov@551: 		DiffHelper<LineSequence> pg = new DiffHelper<LineSequence>();
tikhomirov@544: 		pg.init(new LineSequence(prev).splitByNewlines(), new LineSequence(content).splitByNewlines());
tikhomirov@544: 		pg.findMatchingBlocks(new GeneratePatchInspector(rv));
tikhomirov@544: 		return rv;
tikhomirov@544: 	}
tikhomirov@544: 
tikhomirov@544: 	@Override
tikhomirov@544: 	protected void changed(int s1From, int s1To, int s2From, int s2To) {
tikhomirov@544: 		int from = seq1.chunk(s1From).getOffset();
tikhomirov@544: 		int to = seq1.chunk(s1To).getOffset();
tikhomirov@544: 		byte[] data = seq2.data(s2From, s2To);
tikhomirov@544: 		deltaCollector.add(from, to, data);
tikhomirov@544: 	}
tikhomirov@544: 	
tikhomirov@544: 	@Override
tikhomirov@544: 	protected void deleted(int s2DeletionPoint, int s1From, int s1To) {
tikhomirov@544: 		int from = seq1.chunk(s1From).getOffset();
tikhomirov@544: 		int to = seq1.chunk(s1To).getOffset();
tikhomirov@544: 		deltaCollector.add(from, to, new byte[0]);
tikhomirov@544: 	}
tikhomirov@544: 	
tikhomirov@544: 	@Override
tikhomirov@544: 	protected void added(int s1InsertPoint, int s2From, int s2To) {
tikhomirov@544: 		int insPoint = seq1.chunk(s1InsertPoint).getOffset();
tikhomirov@544: 		byte[] data = seq2.data(s2From, s2To);
tikhomirov@544: 		deltaCollector.add(insPoint, insPoint, data);
tikhomirov@544: 	}
tikhomirov@544: }