Remove whitespace from the ends as well as excessive whitespace within the inside of the string between non-whitespace characters. : String char « Data Type « Java






  1. Java
  2. Data Type
  3. String char

Remove whitespace from the ends as well as excessive whitespace within the inside of the string between non-whitespace characters.

    
/*
 *  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 {
  /**
   * A deep trim of a string remove whitespace from the ends as well as
   * excessive whitespace within the inside of the string between
   * non-whitespace characters. A deep trim reduces internal whitespace down
   * to a single space to perserve the whitespace separated tokenization order
   * of the String.
   * 
   * @param string
   *            the string to deep trim.
   * @return the trimmed string.
   */
  public static final String deepTrim( String string )
  {
      return deepTrim( string, false );
  }


  /**
   * This does the same thing as a trim but we also lowercase the string while
   * performing the deep trim within the same buffer. This saves us from
   * having to create multiple String and StringBuffer objects and is much
   * more efficient.
   * 
   * @see StringTools#deepTrim( String )
   */
  public static final String deepTrimToLower( String string )
  {
      return deepTrim( string, true );
  }


  /**
   * Put common code to deepTrim(String) and deepTrimToLower here.
   * 
   * @param str
   *            the string to deep trim
   * @param toLowerCase
   *            how to normalize for case: upper or lower
   * @return the deep trimmed string
   * @see StringTools#deepTrim( String )
   * 
   * TODO Replace the toCharArray() by substring manipulations
   */
  public static final String deepTrim( String str, boolean toLowerCase )
  {
      if ( ( null == str ) || ( str.length() == 0 ) )
      {
          return "";
      }

      char ch;
      char[] buf = str.toCharArray();
      char[] newbuf = new char[buf.length];
      boolean wsSeen = false;
      boolean isStart = true;
      int pos = 0;

      for ( int i = 0; i < str.length(); i++ )
      {
          ch = buf[i];

          // filter out all uppercase characters
          if ( toLowerCase )
          {
              if ( Character.isUpperCase( ch ) )
              {
                  ch = Character.toLowerCase( ch );
              }
          }

          // Check to see if we should add space
          if ( Character.isWhitespace( ch ) )
          {
              // If the buffer has had characters added already check last
              // added character. Only append a spc if last character was
              // not whitespace.
              if ( wsSeen )
              {
                  continue;
              }
              else
              {
                  wsSeen = true;

                  if ( isStart )
                  {
                      isStart = false;
                  }
                  else
                  {
                      newbuf[pos++] = ch;
                  }
              }
          }
          else
          {
              // Add all non-whitespace
              wsSeen = false;
              isStart = false;
              newbuf[pos++] = ch;
          }
      }

      return ( pos == 0 ? "" : new String( newbuf, 0, ( wsSeen ? pos - 1 : pos ) ) );
  }

}








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