/*
 *                 Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2002 Sun
 * Microsystems, Inc. All Rights Reserved.
 */
package org.netbeans.modules.javacore.parser;

/**
 *
 * @author  th125165
 */
public class StringMeasure implements Measure {
    public static final StringMeasure INSTANCE = new StringMeasure();
    private static final int SAME=0;
    private static final int CASE_SAME=1;
    private static final int DIFFERENT=10;
    
    /** this method implements metrics on Strings.
     * @param x first string
     * @param y second string
     * @return returns int value between 0 and 100.
     * Where 0 means the strings are
     * identical, 100 strings are completly
     * different.
     */
    public final int getDistance(final Object first, final Object second) {
        if (first==second)
            return 0;
        if (first==null || second==null)
            return INFINITE_DISTANCE;
        final String x=(String)first;
        final String y=(String)second;
        final int xlen=x.length();
        final int ylen=y.length();
        int errors=0;
        int xindex=0,yindex=0;
        final char xarr[]=new char[xlen+1];
        final char yarr[]=new char[ylen+1];
        
        x.getChars(0, xlen, xarr, 0);
        y.getChars(0, ylen, yarr, 0);
        while(xindexylen-yindex) {
                xindex++;
            } else if (xlen-xindex