StringUtils.java Source code

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Here is the source code for StringUtils.java

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/*
JSPWiki - a JSP-based WikiWiki clone.
    
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
    
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.    
 */

import java.security.SecureRandom;
import java.util.Properties;
import java.util.Random;

public class StringUtils {

    private static final int EOI = 0;
    private static final int LOWER = 1;
    private static final int UPPER = 2;
    private static final int DIGIT = 3;
    private static final int OTHER = 4;

    private static int getCharKind(int c) {
        if (c == -1) {
            return EOI;
        }

        char ch = (char) c;

        if (Character.isLowerCase(ch))
            return LOWER;
        else if (Character.isUpperCase(ch))
            return UPPER;
        else if (Character.isDigit(ch))
            return DIGIT;
        else
            return OTHER;
    }

    /**
     *  Adds spaces in suitable locations of the input string.  This is
     *  used to transform a WikiName into a more readable format.
     *
     *  @param s String to be beautified.
     *  @return A beautified string.
     */
    public static String beautifyString(String s) {
        return beautifyString(s, " ");
    }

    /**
     *  Adds spaces in suitable locations of the input string.  This is
     *  used to transform a WikiName into a more readable format.
     *
     *  @param s String to be beautified.
     *  @param space Use this string for the space character.
     *  @return A beautified string.
     *  @since 2.1.127
     */
    public static String beautifyString(String s, String space) {
        StringBuffer result = new StringBuffer();

        if (s == null || s.length() == 0)
            return "";

        int cur = s.charAt(0);
        int curKind = getCharKind(cur);

        int prevKind = LOWER;
        int nextKind = -1;

        int next = -1;
        int nextPos = 1;

        while (curKind != EOI) {
            next = (nextPos < s.length()) ? s.charAt(nextPos++) : -1;
            nextKind = getCharKind(next);

            if ((prevKind == UPPER) && (curKind == UPPER) && (nextKind == LOWER)) {
                result.append(space);
                result.append((char) cur);
            } else {
                result.append((char) cur);
                if (((curKind == UPPER) && (nextKind == DIGIT))
                        || ((curKind == LOWER) && ((nextKind == DIGIT) || (nextKind == UPPER)))
                        || ((curKind == DIGIT) && ((nextKind == UPPER) || (nextKind == LOWER)))) {
                    result.append(space);
                }
            }
            prevKind = curKind;
            cur = next;
            curKind = nextKind;
        }

        return result.toString();
    }

}