StringUtils.java

/**
 *
 * NORD POS is a fork of Openbravo POS.
 *
 * Copyright (C) 2009-2013 Nord Trading Ltd. <http://www.nordpos.com>
 *
 * This file is part of NORD POS.
 *
 * NORD POS is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * NORD POS 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * NORD POS. If not, see <http://www.gnu.org/licenses/>.
 */
package com.nordpos.device.util;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

/**
 *
 * @author Andrey Svininykh <svininykh@gmail.com>
 * @version NORD POS 3.0
 */
public class StringUtils {

    private static final char[] hexchars = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

    private StringUtils() {
    }

    public static String encodeXML(String sValue) {

        if (sValue == null) {
            return null;
        } else {
            StringBuilder buffer = new StringBuilder();
            for (int i = 0; i < sValue.length(); i++) {
                char charToCompare = sValue.charAt(i);
                if (charToCompare == '&') {
                    buffer.append("&");
                } else if (charToCompare == '<') {
                    buffer.append("<");
                } else if (charToCompare == '>') {
                    buffer.append(">");
                } else if (charToCompare == '\"') {
                    buffer.append(""");
                } else if (charToCompare == '\'') {
                    buffer.append("'");
                } else {
                    buffer.append(charToCompare);
                }
            }
            return buffer.toString();
        }
    }

    public static String byte2hex(byte[] binput) {

        StringBuilder sb = new StringBuilder(binput.length * 2);
        for (int i = 0; i < binput.length; i++) {
            int high = ((binput[i] & 0xF0) >> 4);
            int low = (binput[i] & 0x0F);
            sb.append(hexchars[high]);
            sb.append(hexchars[low]);
        }
        return sb.toString();
    }

    public static byte[] hex2byte(String sinput) {
        int length = sinput.length();

        if ((length & 0x01) != 0) {
            throw new IllegalArgumentException("odd number of characters.");
        }

        byte[] out = new byte[length >> 1];

        // two characters form the hex value.
        for (int i = 0, j = 0; j < length; i++) {
            int f = Character.digit(sinput.charAt(j++), 16) << 4;
            f = f | Character.digit(sinput.charAt(j++), 16);
            out[i] = (byte) (f & 0xFF);
        }

        return out;
    }

    public static String readResource(String resource) throws IOException {

        InputStream in = StringUtils.class.getResourceAsStream(resource);
        if (in == null) {
            throw new FileNotFoundException(resource);
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len;
        while ((len = in.read(buffer)) > 0) {
            out.write(buffer, 0, len);
        }
        byte[] data = out.toByteArray();

        return new String(data, "UTF-8");
    }

    public static boolean isNumber(String sCardNumber) {

        if ((sCardNumber == null) || (sCardNumber.equals(""))) {
            return false;
        }

        for (int i = 0; i < sCardNumber.length(); i++) {
            char c = sCardNumber.charAt(i);
            if (c != '0' && c != '1' && c != '2' && c != '3' && c != '4' && c != '5' && c != '6' && c != '7' && c != '8' && c != '9') {
                return false;
            }
        }

        return true;
    }

    public static String getWhiteString(int iSize, char cWhiteChar) {

        char[] cFill = new char[iSize];
        for (int i = 0; i < iSize; i++) {
            cFill[i] = cWhiteChar;
        }
        return new String(cFill);
    }

    public static String getWhiteString(int iSize) {

        return getWhiteString(iSize, ' ');
    }

    public static String alignLeft(String sLine, int iSize) {

        if (sLine.length() > iSize) {
            return sLine.substring(0, iSize);
        } else {
            return sLine + getWhiteString(iSize - sLine.length());
        }
    }

    public static String alignRight(String sLine, int iSize) {

        if (sLine.length() > iSize) {
            return sLine.substring(sLine.length() - iSize);
        } else {
            return getWhiteString(iSize - sLine.length()) + sLine;
        }
    }

    public static String alignCenter(String sLine, int iSize) {

        if (sLine.length() > iSize) {
            return alignRight(sLine.substring(0, (sLine.length() + iSize) / 2), iSize);
        } else {
            return alignRight(sLine + getWhiteString((iSize - sLine.length()) / 2), iSize);
        }
    }

    public static String alignCenter(String sLine) {
        return alignCenter(sLine, 42);
    }
}