session-android/src/org/thoughtcrime/securesms/util/NumberUtil.java

/** 
 * Copyright (C) 2011 Whisper Systems
 * 
 * This program 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.
 *
 * 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
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.thoughtcrime.securesms.util;

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

import android.telephony.PhoneNumberUtils;

public class NumberUtil {
	
  private static final String emailExpression = "^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";  
  private static final Pattern emailPattern   = Pattern.compile(emailExpression, Pattern.CASE_INSENSITIVE);  
	
  public static boolean isValidEmail(String number) {
    Matcher matcher = emailPattern.matcher(number);
    return matcher.matches();
  }
	
  public static boolean isValidSmsOrEmail(String number) {
    return PhoneNumberUtils.isWellFormedSmsAddress(number) || isValidEmail(number);
  }
	
  public static String filterNumber(String number) {
    if (number == null) return null;
		
    int length            = number.length();
    StringBuilder builder = new StringBuilder(length);

    for (int i = 0; i < length; i++) {
      char character = number.charAt(i);

      if (Character.isDigit(character) || character == '+')
	builder.append(character);
    }
        
    return builder.toString();
  }
	
}