Android Open Source - APO-Theta-Upsilon-App Hex

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License

The source code is released under:

GNU Lesser General Public License

Java Source Code

/*
 * Copyright 2011 Devin Schwab, Umang Banugaria
 */*from  w  w  w  .  j  a  v  a2 s .com*/
 * This file is part of the APO Theta Upsilon App for Case Western Reserve University's Alpha Phi Omega Theta Upsilon Chapter.
 *
 * The APO Theta Upsilon program is free software: you can redistribute it and/or modify
 * it under the terms of the Lesser GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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
 * Lesser GNU General Public License for more details.
 *
 * You should have received a copy of the Lesser GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package edu.cwru.apo;

import java.util.regex.Matcher;
import java.util.regex.Pattern;


// stores information as strings of hexadecimal
// This was made a separate class so it would be clear in the source code
// what was a general string and what was a hex string
public class Hex {
  
  private String hex;
  
  public Hex(byte[] input)
  {
    int len = input.length;
    StringBuilder sb = new StringBuilder(len << 1);
    for(int i = 0; i<len; i++)
    {
      sb.append(Character.forDigit((input[i] & 0xf0) >> 4, 16));
      sb.append(Character.forDigit(input[i] & 0x0f, 16));
    }
    hex = sb.toString();
  }
  
  public Hex(String input) {
    input.toLowerCase();
    
    if(Pattern.matches("[0-9a-f]+", input))
    {
      hex = input;
    }
  }

  // Use Regex to make sure input is correct format
  // if so save it, otherwise set it to null
  public boolean toHex(String input)
  {
    //make the string lowercase
    input.toLowerCase();
    
    // if it exists set it to input, if not set it to null
    if(Pattern.matches("[0-9a-f]+", input))
    {
      hex = input;  
      return true;
    }
    return false;
  }
  
  // check if hex was set correctly
  public boolean isNull()
  {
    if(hex == null)
      return true;
    return false;
  }
  
  public byte[] toBytes()
  {
    if (hex == null)
    {
      return null;
    }
    else if (hex.length() < 2) 
    {
      return null;
    }
    else
    {
      int len = hex.length() /2;
      byte[] buffer = new byte[len];
      for(int i=0; i<len; i++)
      {
        buffer[i] = (byte) Integer.parseInt(hex.substring(i*2, i*2+2), 16);
      }
      return buffer;
    }
  }
  
  public String toString()
  {
    return hex;
  }

}

Java Source Code List

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