Truncates large Strings showing a portion of the String's head and tail with the center cut out and replaced with '...'. : String Strip « Data Type « Java






  1. Java
  2. Data Type
  3. String Strip

Truncates large Strings showing a portion of the String's head and tail with the center cut out and replaced with '...'.

    

/*
 *  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 {
  /**
   * Truncates large Strings showing a portion of the String's head and tail
   * with the center cut out and replaced with '...'. Also displays the total
   * length of the truncated string so size of '...' can be interpreted.
   * Useful for large strings in UIs or hex dumps to log files.
   * 
   * @param str
   *            the string to truncate
   * @param head
   *            the amount of the head to display
   * @param tail
   *            the amount of the tail to display
   * @return the center truncated string
   */
  public static final String centerTrunc( String str, int head, int tail )
  {
      StringBuffer buf = null;

      // Return as-is if String is smaller than or equal to the head plus the
      // tail plus the number of characters added to the trunc representation
      // plus the number of digits in the string length.
      if ( str.length() <= ( head + tail + 7 + str.length() / 10 ) )
      {
          return str;
      }

      buf = new StringBuffer();
      buf.append( '[' ).append( str.length() ).append( "][" );
      buf.append( str.substring( 0, head ) ).append( "..." );
      buf.append( str.substring( str.length() - tail ) );
      buf.append( ']' );
      return buf.toString();
  }


}








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