org.mentawai.util.StringUtils.java Source code

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/*
 * Mentawai Web Framework http://mentawai.lohis.com.br/
 * Copyright (C) 2005  Sergio Oliveira Jr. (sergio.oliveira.jr@gmail.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.mentawai.util;

import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;
import java.util.Random;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.codec.binary.Base64;
import org.mentawai.i18n.LocaleManager;

public class StringUtils {

    private static final String[] CHARS = split("abcdefghijklmnopqrstuvxwyz");

    private static final String[] NUMBERS = split("0123456789");

    private static final Random RAND = new Random();

    public static boolean isNotEmpty(String s) {
        return s != null && s.length() > 0;
    }

    public static String decodeBase64(String s) {
        return org.apache.commons.codec.binary.StringUtils.newStringUtf8(Base64.decodeBase64(s));
    }

    public static String encodeBase64(String s) {
        return Base64.encodeBase64String(org.apache.commons.codec.binary.StringUtils.getBytesUtf8(s));
    }

    /**
     * Checks if String is null or empty.
     * @param str String
     * @return boolean
     */
    public static boolean isEmpty(String str) {
        return str == null || str.trim().length() == 0;
    }

    /**
     * Turns a line with strings separated by one
     * or more spaces into a String array.
     * 
     * @param line The line to be sliced
     * @return A String array with the slices
     */
    public static String[] slice(String line) {
        return line.trim().split("\\s+");
    }

    public static String[] split(String line) {
        String[] s = new String[line.length()];

        for (int i = 0; i < line.length(); i++) {
            s[i] = String.valueOf(line.charAt(i));
        }
        return s;
    }

    public static String randomString(int size) {

        return randomString(size, false);
    }

    public static String randomString(int size, boolean onlyChars) {

        return randomString(size, onlyChars, false);
    }

    public static String randomNumber(int size) {

        int count = 0;

        StringBuilder sb = new StringBuilder(size);

        while (count < size) {

            int index = RAND.nextInt(NUMBERS.length);

            sb.append(NUMBERS[index]);

            count++;
        }

        return sb.toString();
    }

    public static String randomString(int size, boolean onlyChars, boolean upcase) {

        int count = 0;

        StringBuilder sb = new StringBuilder(size);

        while (count < size) {

            int index = RAND.nextInt(CHARS.length);

            sb.append(CHARS[index]);

            count++;

            if (!onlyChars) {

                if (count >= size)
                    break;

                index = RAND.nextInt(NUMBERS.length);

                sb.append(NUMBERS[index]);

                count++;
            }
        }

        return upcase ? sb.toString().toUpperCase() : sb.toString();
    }

    private static byte toByte(char hex) {

        switch (hex) {

        case '0':
            return 0;
        case '1':
            return 1;
        case '2':
            return 2;
        case '3':
            return 3;
        case '4':
            return 4;
        case '5':
            return 5;
        case '6':
            return 6;
        case '7':
            return 7;
        case '8':
            return 8;
        case '9':
            return 9;
        case 'A':
        case 'a':
            return 10;
        case 'B':
        case 'b':
            return 11;
        case 'C':
        case 'c':
            return 12;
        case 'D':
        case 'd':
            return 13;
        case 'E':
        case 'e':
            return 14;
        case 'F':
        case 'f':
            return 15;

        default:
            throw new IllegalArgumentException("Not a valid hex digit: " + hex);
        }
    }

    public static String fromBytesToHex(byte[] b) {

        StringBuilder sb = new StringBuilder(b.length * 2);

        for (int i = 0; i < b.length; i++) {
            sb.append(Integer.toString((b[i] & 0xff) + 0x100, 16).substring(1));
        }

        return sb.toString();
    }

    public static byte[] fromHexToBytes(String hex) {

        int x = hex.length() / 2;

        byte[] b = new byte[x];

        int index = 0;

        for (int i = 0; i < hex.length(); i += 2) {

            byte b1 = toByte(hex.charAt(i));

            byte b2 = toByte(hex.charAt(i + 1));

            b[index++] = (byte) ((b1 << 4) + b2);
        }

        return b;
    }

    public static String fromHexToString(String hex) {
        return new String(fromHexToBytes(hex));
    }

    public static String fromStringToHex(String s) {
        return fromBytesToHex(s.getBytes());
    }

    public static String invert(String s) {
        StringBuilder sb = new StringBuilder(s.length());

        for (int i = s.length() - 1; i >= 0; i--) {
            sb.append(s.charAt(i));
        }

        return sb.toString();
    }

    /**
    * Convert Money value as String to a Number
    * @param value
    * @param loc (Optional) Default is LocaleManager.DEFAULT_LOCALE
    */
    public static Number parseCurrencyNumber(String value, Locale loc) throws ParseException {
        if (loc == null)
            loc = LocaleManager.DEFAULT_LOCALE;
        String symbol = DecimalFormatSymbols.getInstance(loc).getCurrencySymbol();
        if ("R$".equals(symbol))
            symbol += " "; // Caso seja a moeda Real.
        Number number = NumberFormat.getCurrencyInstance(loc).parse(symbol + value);
        return number;
    }

    public static String[] REPLACES = { "a", "e", "i", "o", "u", "c", "A", "E", "I", "O", "U", "C" };

    public static Pattern[] PATTERNS = null;

    static {
        PATTERNS = new Pattern[REPLACES.length];
        PATTERNS[0] = Pattern.compile("[]");
        PATTERNS[1] = Pattern.compile("[]");
        PATTERNS[2] = Pattern.compile("[]");
        PATTERNS[3] = Pattern.compile("[]");
        PATTERNS[4] = Pattern.compile("[]");
        PATTERNS[5] = Pattern.compile("[]");
        PATTERNS[6] = Pattern.compile("[?]");
        PATTERNS[7] = Pattern.compile("[]");
        PATTERNS[8] = Pattern.compile("[??]");
        PATTERNS[9] = Pattern.compile("[]");
        PATTERNS[10] = Pattern.compile("[]");
        PATTERNS[11] = Pattern.compile("[]");
    }

    public static String removeAccents(String text) {
        String result = text;
        for (int i = 0; i < PATTERNS.length; i++) {
            Matcher matcher = PATTERNS[i].matcher(result);
            result = matcher.replaceAll(REPLACES[i]);
        }
        return result;
    }
}