package patch;

/**
 * This Library implements a simple patch algorithm which is able to process
 * the output of diff in normal format.
 *
 * This class implements an immutable data structure that is used to store the modification chunks.
 *
 * A Chunk is a consecutive amount of changes. See the diff documentation for more
 * information.
 *
 * see <a href="http://www.gnu.org/software/diffutils/manual/html_mono/diff.html#Normal">http://www.gnu.org/software/diffutils/manual/html_mono/diff.html#Normal</a>
 *
 * <pre>
 *          Copyright (c) 2007 Dominik Schulz
 *
 *          This file is part of jPatchLib.
 *
 *          jPatchLib 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; either version 2 of the License, or
 *          (at your option) any later version.
 *
 *          jPatchLib 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.
 *
 *          You should have received a copy of the GNU General Public License
 *          along with jPatchLib; if not, write to the Free Software
 *          Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 * </pre>
 *
 * @author Dominik
 */
public class Chunk {
	String getName() {
		return this.from1 + "," + this.from2 + this.op + this.to1 + "," + this.to2;
	}

	/**
	 * What does this chunk do?
	 * One of:
	 * a (add), c (change), or d (delete)
	 */
	private final char		op;

	/**
	 * Beginning of this change in the first file.
	 */
	private final int		from1;

	/**
	 * End of this change in the first file.
	 */
	private final int		from2;

	/**
	 * Beginning of this change in the second file.
	 */
	private final int		to1;

	/**
	 * End of this change in the second file.
	 */
	private final int		to2;

	/**
	 * The old text.
	 */
	private final String[]	patch;

	/**
	 * The new text.
	 */
	private final String[]	target;

	/**
	 * Create a new chunk.
	 * @param op a (add), d (delete) or c (change).
	 * @param from1
	 * @param from2
	 * @param to1
	 * @param to2
	 * @param patch
	 * @param target
	 */
	public Chunk(char op, int from1, int from2, int to1, int to2, String[] patch, String[] target) {
		this.op = op;
		this.from1 = from1;
		this.from2 = from2;
		this.to1 = to1;
		this.to2 = to2;
		this.patch = patch;
		this.target = target;
	}

	/**
	 * @return the from1
	 */
	public int getFrom1() {
		return from1;
	}

	/**
	 * @return the from2
	 */
	public int getFrom2() {
		return from2;
	}

	/**
	 * @return the op
	 */
	public char getOp() {
		return op;
	}

	/**
	 * @return the patch
	 */
	public String[] getPatch() {
		return patch;
	}

	/**
	 * @return the target
	 */
	public String[] getTarget() {
		return target;
	}

	/**
	 * @return the to1
	 */
	public int getTo1() {
		return to1;
	}

	/**
	 * @return the to2
	 */
	public int getTo2() {
		return to2;
	}
}