Android Open Source - EverToDo Strings

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License

The source code is released under:

GNU General Public License

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Java Source Code

/**
 *//  w w w . j av a  2  s .c  om
 * Todo.txt Touch/src/com/todotxt/todotxttouch/util/Task.java
 *
 * Copyright (c) 2011 Tim Barlotta
 *
 * LICENSE:
 *
 * This file is part of Todo.txt Touch, an Android app for managing your todo.txt file (http://todotxt.com).
 *
 * Todo.txt Touch 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 2 of the License, or (at your option) any
 * later version.
 *
 * Todo.txt Touch 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 Todo.txt Touch.  If not, see
 * <http://www.gnu.org/licenses/>.
 * 
 * Strings
 * A utility class for manipulating strings
 *
 * @author Tim Barlotta <tim[at]barlotta[dot]net>
 * @license http://www.gnu.org/licenses/gpl.html
 * @copyright 2011 Tim Barlotta
 */
package com.todotxt.todotxttouch.util;

public final class Strings {
  public static final String SINGLE_SPACE = " ";

  /**
   * Inserts a given string into another padding it with spaces. Is aware if
   * the insertion point has a space on either end and does not add extra
   * spaces.
   * 
   * @param s
   *            the string to insert into
   * @param insertAt
   *            the position to insert the string
   * @param stringToInsert
   *            the string to insert
   * @return the result of inserting the stringToInsert into the passed in
   *         string
   * @throws IndexOutOfBoundsException
   *             if the insertAt is negative, or insertAt is larger than the
   *             length of s String object
   */
  public static String insertPadded(String s, int insertAt,
      String stringToInsert) {
    if (Strings.isEmptyOrNull(stringToInsert)) {
      return s;
    }

    if (insertAt < 0) {
      throw new IndexOutOfBoundsException("Invalid insertAt of ["
          + insertAt + "] for string [" + s + "]");
    }

    StringBuilder newText = new StringBuilder();
    if (insertAt > 0) {
      newText.append(s.substring(0, insertAt));
      if (newText.lastIndexOf(SINGLE_SPACE) != newText.length() - 1) {
        newText.append(SINGLE_SPACE);
      }
      newText.append(stringToInsert);
      String postItem = s.substring(insertAt);
      if (postItem.indexOf(SINGLE_SPACE) != 0) {
        newText.append(SINGLE_SPACE);
      }
      newText.append(postItem);
    } else {
      newText.append(stringToInsert);
      if (s.indexOf(SINGLE_SPACE) != 0) {
        newText.append(SINGLE_SPACE);
      }
      newText.append(s);
    }
    return newText.toString();
  }

  /**
   * Checks the passed in string to see if it is null or an blank string
   * 
   * @param s
   *            the string to check
   * @return true if null or ""
   */
  public static boolean isEmptyOrNull(String s) {
    return s == null || s.length() == 0;
  }
}

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