CharArrayLCSAlgorithm.java

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/*
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 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */
 
package org.openoffice.xmerge.merger.diff;
 
import java.util.ArrayList;
import org.openoffice.xmerge.merger.Difference;
 
public class CharArrayLCSAlgorithm {
 
    public Difference[] computeDiffs(char[] orgSeq, char[] modSeq) {
 
        int orgSeqlen = orgSeq.length;
        int modSeqlen = modSeq.length;
 
        // Diff table is used to keep track which element is the same or not
        // in those 2 sequences
        int[][] diffTable = createDiffTable(orgSeq, modSeq);
 
        ArrayList<Difference> diffResult = new ArrayList<Difference>();
 
        generateResult(diffTable, orgSeqlen, modSeqlen, diffResult);
 
        // convert the vector to array, it has to do it here as
        // generateResult is called recursively
        Difference[] diffArray = new Difference[diffResult.size()];
        diffResult.toArray(diffArray);
 
        return diffArray;
    }
 
    private int[][] createDiffTable(char[] orgSeq, char[] modSeq) {
        int orgSeqlen = orgSeq.length + 1;
        int modSeqlen = modSeq.length + 1;
        int[][] diffTable;
 
        // initialize the diffTable (it needs to be 1 row/col bigger
        // than the original str)
        diffTable = new int[orgSeqlen][];
        for (int i = 0; i < orgSeqlen; i++) {
            diffTable[i] = new int[modSeqlen];
        }
 
        // compute the diff Table using LCS algorithm, refer to the book
        // mentioned at the top of the program
        for (int i = 1; i < orgSeqlen; i++) {
            for (int j = 1; j < modSeqlen; j++) {
 
                if (orgSeq[i-1] == modSeq[j-1]) {
                    diffTable[i][j] = diffTable[i-1][j-1]+1;
                } else {
                    if (diffTable[i-1][j] >= diffTable[i][j-1]) {
                        diffTable[i][j] = diffTable[i-1][j];
                    } else {
                        diffTable[i][j] = diffTable[i][j-1];
                    }
                }
            }
        }
 
        return diffTable;
    }
 
    private void generateResult(int[][] diffTable, int i, int j,
                                ArrayList<Difference> diffVector) {
 
        // handle the first element
        if (i == 0 || j == 0) {
            if (i == 0 && j == 0) {
                // return
            } else if (j == 0) {
                for (int cnt = 0; cnt < i; cnt++) {
                    Difference diff =
                        new Difference(Difference.DELETE, cnt, j);
                    diffVector.add(diff);
                }
            } else {
                for (int cnt = 0; cnt < j; cnt++) {
                    Difference diff =
                        new Difference(Difference.ADD, i, cnt);
                    diffVector.add(diff);
                }
            }
            return;
        }
 
        // for the detail of this algorithm, refer to the book mentioned on
        // the top and page 317 and 318.
        if ((diffTable[i-1][j-1] == diffTable[i][j] -1) &&
            (diffTable[i-1][j-1] == diffTable[i-1][j]) &&
            (diffTable[i-1][j-1] == diffTable[i][j-1])) {
 
            // the element of ith and jth in org and mod sequence is the same
            generateResult(diffTable, i-1, j-1, diffVector);
        } else {
            if (diffTable[i-1][j] > diffTable[i][j-1]) {
 
                // recursively call first, then add the result so that
                // the beginning of the diffs will be stored first
                generateResult(diffTable, i-1, j, diffVector);
 
                Difference diff =
                    new Difference(Difference.DELETE, i-1, j);
                diffVector.add(diff);
            } else if (diffTable[i-1][j] < diffTable[i][j-1]) {
 
                // recursively call first, then add the result so that
                // the beginning of the diffs will be stored first
                generateResult(diffTable, i, j-1, diffVector);
 
                Difference diff =
                    new Difference(Difference.ADD, i, j-1);
                diffVector.add(diff);
            } else { // diffTable[i-1][j] == diffTable[i][j-1]
                // recursively call first, then add the result so that
                // the beginning of the diffs will be stored first
                generateResult(diffTable, i-1, j-1, diffVector);
 
                Difference diff =
                    new Difference(Difference.CHANGE, i-1, j-1);
                diffVector.add(diff);
 
            }
        }
    }
}