session-android/src/org/thoughtcrime/redphone/util/Util.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.redphone.util;

import android.app.AlertDialog;
import android.content.Context;
import android.text.Editable;

import java.io.UnsupportedEncodingException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

/**
 * Random utility functions.
 *
 * @author Moxie Marlinspike
 *
 */

public class Util {

  public static void sleep(long millis) {
    try {
      Thread.sleep(millis);
    } catch (InterruptedException ie) {
      throw new AssertionError(ie);
    }
  }

  public static byte[] getBytes(String fromString) {
    try {
      return fromString.getBytes("UTF8");
    } catch (UnsupportedEncodingException e) {
      throw new AssertionError(e);
    }
  }

  public static String getString(byte[] fromBytes) {
    try {
      return new String(fromBytes, "UTF8");
    } catch (UnsupportedEncodingException e) {
      throw new AssertionError(e);
    }
  }

  public static boolean isEmpty(String value) {
    return (value == null || value.trim().length() == 0);
  }

  public static boolean isEmpty(CharSequence value) {
    return value == null || isEmpty(value.toString());
  }

  public static boolean isEmpty(Editable value) {
    return value == null || isEmpty(value.toString());
  }

}