/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.sun.org.apache.xml.internal.utils;

/**

 * Class used to verify whether the specified <var>ch</var>

 * conforms to the XML 1.0 definition of whitespace.

 * @xsl.usage internal

 */

public class XMLCharacterRecognizer

{

  /**

   * Returns whether the specified <var>ch</var> conforms to the XML 1.0 definition

   * of whitespace.  Refer to <A href="http://www.w3.org/TR/1998/REC-xml-19980210#NT-S">

   * the definition of <CODE>S</CODE></A> for details.

   * @param ch Character to check as XML whitespace.

   * @return =true if <var>ch</var> is XML whitespace; otherwise =false.

   */

  public static boolean isWhiteSpace(char ch)

  {

    return (ch == 0x20) || (ch == 0x09) || (ch == 0xD) || (ch == 0xA);

  }

  /**

   * Tell if the string is whitespace.

   *

   * @param ch Character array to check as XML whitespace.

   * @param start Start index of characters in the array

   * @param length Number of characters in the array

   * @return True if the characters in the array are

   * XML whitespace; otherwise, false.

   */

  public static boolean isWhiteSpace(char ch[], int start, int length)

  {

    int end = start + length;

    for (int s = start; s < end; s++)

    {

      if (!isWhiteSpace(ch[s]))

        return false;

    }

    return true;

  }

  /**

   * Tell if the string is whitespace.

   *

   * @param buf StringBuffer to check as XML whitespace.

   * @return True if characters in buffer are XML whitespace, false otherwise

   */

  public static boolean isWhiteSpace(StringBuffer buf)

  {

    int n = buf.length();

    for (int i = 0; i < n; i++)

    {

      if (!isWhiteSpace(buf.charAt(i)))

        return false;

    }

    return true;

  }

  /**

   * Tell if the string is whitespace.

   *

   * @param s String to check as XML whitespace.

   * @return True if characters in buffer are XML whitespace, false otherwise

   */

  public static boolean isWhiteSpace(String s)

  {

    if(null != s)

    {

      int n = s.length();

      for (int i = 0; i < n; i++)

      {

        if (!isWhiteSpace(s.charAt(i)))

          return false;

      }

    }

    return true;

  }

}