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/*
 * Copyright (c) 2015-2019, Virgil Security, Inc.
 *
 * Lead Maintainer: Virgil Security Inc. 
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     (1) Redistributions of source code must retain the above copyright notice, this
 *     list of conditions and the following disclaimer.
 *
 *     (2) Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 *     (3) Neither the name of virgil nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.virgilsecurity.sdk.utils;

/**
 * Operations on {@link java.lang.String} that are {@code null} safe.
 *
 * @author Andrii Iakovenko
 */
public class StringUtils {

  /**
   * Compares two Strings, returning {@code true} if they are equal.
   *
   * @param str1 the first String, may be null
   * @param str2 the second String, may be null
   * @return {@code true} if the Strings are equal, case sensitive, or both {@code null}
   */
  public static boolean equals(String str1, String str2) {
    return str1 == null ? str2 == null : str1.equals(str2);
  }

  /**
   * Checks if a CharSequence is whitespace, empty ("") or null.
   *
   * @param cs the CharSequence to check, may be null
   * @return {@code true} if the CharSequence is null, empty or whitespace
   */
  public static boolean isBlank(final CharSequence cs) {
    int strLen;
    if (cs == null || (strLen = cs.length()) == 0) {
      return true;
    }
    for (int i = 0; i < strLen; i++) {
      if (!Character.isWhitespace(cs.charAt(i))) {
        return false;
      }
    }
    return true;
  }
}