net.sf.zekr.common.util.StringUtils.java Source code

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Here is the source code for net.sf.zekr.common.util.StringUtils.java

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/*
 *               In the name of Allah
 * This file is part of The Zekr Project. Use is subject to
 * license terms.
 *
 * Author:         Mohsen Saboorian
 * Start Date:     Aug 1, 2008
 */
package net.sf.zekr.common.util;

/**
 * @author Mohsen Saboorian
 */
public class StringUtils {
    public static class Region {
        public int from;
        public int to;

        public Region(int from, int to) {
            this.from = from;
            this.to = to;
        }
    }

    public static Region getNthRegion(String src, int n, char delim) {
        int f = -1, t = 0;
        int i;
        for (i = 0; i < n - 1; i++) {
            f = src.indexOf(delim, f + 1);
        }
        if (f == -1 && n > 1)
            return null;
        t = src.indexOf(delim, f + 1);
        if (t == -1)
            return new Region(f + 1, src.length());
        else
            return new Region(f + 1, t);
    }

    public static String getNthWord(String src, int n, char delim) {
        Region r = getNthRegion(src, n, delim);
        return r == null ? null : src.substring(r.from, r.to);
    }

    public static void main(String[] args) {
        final String STR = "This page was last modified s";

        System.out.println(StringUtils.getNthWord(STR, 1, ' '));
        System.out.println(StringUtils.getNthWord(STR, 3, ' '));
        System.out.println(StringUtils.getNthWord(STR, 6, ' '));
        System.out.println(StringUtils.getNthWord(STR, 7, ' '));

        System.out.println(abbreviate(STR, 12));
        System.out.println(abbreviate(STR, 0));
        System.out.println(abbreviate(STR, 2));
        System.out.println(abbreviate(STR, 40));
        System.out.println(abbreviate("a b", 30));
    }

    /**
     * Similar to {@link org.apache.commons.lang.StringUtils#abbreviate(String, int)} method but adds no
     * ellipsis to the end of the abbreviated string. This method also abbreviates to the nearest space
     * character (\x20), so that the result string size is smaller or equal to size parameter.<br>
     * This method returns an empty string if no space character found within the given size range.
     * 
     * @param str string to be abbreviated
     * @param size boundary to which the result size of abbreviated string is less or equal
     * @return abbreviated string
     */
    public static String abbreviate(String str, int size) {
        if (str.length() <= size)
            return str;
        int index = str.lastIndexOf(' ', size);
        if (index <= -1)
            return "";
        return str.substring(0, index);
    }
}