Android Open Source - Todo Strings

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * This file is part of Todo.txt for Android, an app for managing your todo.txt file (http://todotxt.com).
 */*from   w  ww .  j  av a2s.c o  m*/
 * Copyright (c) 2009-2013 Todo.txt for Android contributors (http://todotxt.com)
 *
 * LICENSE:
 *
 * Todo.txt for Android 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 for Android 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 for Android. If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * Todo.txt for Android's source code is available at https://github.com/ginatrapani/todo.txt-android
 *
 * @author Todo.txt for Android contributors <todotxt@yahoogroups.com>
 * @license http://www.gnu.org/licenses/gpl.html
 * @copyright 2009-2013 Todo.txt for Android contributors (http://todotxt.com)
 */

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. If the string-to-insert is already present (and not part of
   * another word) we return the original string unchanged.
   * @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 insertPaddedIfNeeded(String s, int insertAt, String stringToInsert) {
    if (Strings.isEmptyOrNull(stringToInsert)) {
      return s;
    }

    boolean found = false;
    int startPos = 0;

    while ((startPos < s.length()) && (!found)) {
      int pos = s.indexOf(stringToInsert, startPos);

      if (pos < 0) {
        break;
      }

      startPos = pos + 1;
      int before = pos - 1;
      int after = pos + stringToInsert.length();

      if (((pos == 0) || (Character.isWhitespace(s.charAt(before)))) &&
        ((after >= s.length()) || (Character.isWhitespace(s.charAt(after))))) {
        found = true;
      }
    }

    if (found) {
      StringBuilder newText = new StringBuilder(s);

      if (newText.lastIndexOf(SINGLE_SPACE) != newText.length() - 1) {
        newText.append(SINGLE_SPACE);
      }

      return (newText.toString());
    } else {
      return (Strings.insertPadded(s, insertAt, stringToInsert));
    }
  }

  /**
   * 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 empty string
   * @param s the string to check
   * @return true if null or ""
   */
  public static boolean isEmptyOrNull(String s) {
    return s == null || s.length() == 0;
  }

  /**
   * Checks the passed in string to see if it is null, empty, or blank; where
   * 'blank' is defined as consisting entirely of whitespace.
   * @param s the string to check
   * @return true if null or "" or all whitespace
   */
  public static boolean isBlank(String s) {
    return isEmptyOrNull(s) || s.trim().length() == 0;
  }
}

Java Source Code List

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