Check if a text is present at the current position in a buffer(char array and char array)

      
import java.io.File;
import java.io.FileFilter;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

/*
 *  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. 
 *  
 */



/**
 * Various string manipulation methods that are more efficient then chaining
 * string operations: all is done in the same buffer without creating a bunch of
 * string objects.
 * 
 * @author <a href="mailto:dev@labs.apache.org">Dungeon Project</a>
 */
public class Main {
  /**
   * Check if a text is present at the current position in a buffer.
   * 
   * @param charArray
   *            The buffer which contains the data
   * @param index
   *            Current position in the buffer
   * @param text
   *            The text we want to check
   * @return <code>true</code> if the buffer contains the text.
   */
  public static final int areEquals( char[] charArray, int index, String text )
  {
      if ( ( charArray == null ) || ( charArray.length == 0 ) || ( charArray.length <= index ) || ( index < 0 )
          || ( text == null ) )
      {
          return -1;
      }
      else
      {
          char[] data = text.toCharArray();

          return areEquals( charArray, index, data );
      }
  }

  /**
   * Check if a text is present at the current position in a buffer.
   * 
   * @param charArray
   *            The buffer which contains the data
   * @param index
   *            Current position in the buffer
   * @param charArray2
   *            The text we want to check
   * @return <code>true</code> if the buffer contains the text.
   */
  public static final int areEquals( char[] charArray, int index, char[] charArray2 )
  {

      if ( ( charArray == null ) || ( charArray.length == 0 ) || ( charArray.length <= index ) || ( index < 0 )
          || ( charArray2 == null ) || ( charArray2.length == 0 )
          || ( charArray2.length > ( charArray.length + index ) ) )
      {
          return -1;
      }
      else
      {
          for ( int i = 0; i < charArray2.length; i++ )
          {
              if ( charArray[index++] != charArray2[i] )
              {
                  return -1;
              }
          }

          return index;
      }
  }
}

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Check if a text is present at the current position in a buffer(char array and char array) : Array Compare « Collections Data Structure « Java

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