Sorts a property list and turns the sorted list into a string. : Properties « Development Class « Java

1. Java
2. Development Class
3. Properties

Sorts a property list and turns the sorted list into a string.

       
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;

/*

   Derby - Class org.apache.derby.iapi.util.PropertyUtil

   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.

 */



public class Main {

  /**
   * Sorts a property list and turns the sorted list into a string.
   *
   * @param  list  property list to sort
   *
   * @return a string version of the sorted list
   */
 public  static  String  sortProperties( Properties list )
 {
   // stringify them with no indentation
   return sortProperties(list, null);
 }
  /**
   * Sorts property list and print out each key=value pair prepended with 
   * specific indentation.  If indent is null, do not prepend with
   * indentation. 
   *
   * The output string shows up in two styles, style 1 looks like
   * { key1=value1, key2=value2, key3=value3 }
   *
   * style 2 looks like
   *    key1=value1
   *    key2=value2
   *    key3=value3
   * where indent goes between the new line and the keys
   *
   * To get style 1, pass in a null indent
   * To get sytle 2, pass in non-null indent (whatever you want to go before
   * the key value)
   */
  public  static  String  sortProperties( Properties list, String indent )
  {
    int       size = list == null ? 0 : list.size();
    int       count = 0;
    String[]    array = new String[size];
    String      key;
    String      value;
    StringBuffer  buffer;

    // Calculate the number of properties in the property list and
    // build an array of all the property names.
    // We need to go thru the enumeration because Properties has a
    // recursive list of defaults.
    if (list != null)
    {
      for (Enumeration propertyNames = list.propertyNames();
         propertyNames.hasMoreElements(); )
      {
        if (count == size)
        {
          // need to expand the array
          size = size*2;
          String[] expandedArray = new String[size];
          System.arraycopy(array, 0, expandedArray, 0, count);
          array = expandedArray;
        }
        key = (String) propertyNames.nextElement();
        array[ count++ ] = key;
      }

      // now sort the array
      java.util.Arrays.sort(array, 0, count);
    }

    // now stringify the array
    buffer = new StringBuffer();
    if (indent == null)
      buffer.append( "{ " );

    for ( int ictr = 0; ictr < count; ictr++ )
    {
      if ( ictr > 0 && indent == null)
        buffer.append( ", " );

      key = array[ ictr ];

      if (indent != null)
        buffer.append( indent );

      buffer.append( key ); buffer.append( "=" );

      value = list.getProperty( key, "MISSING_VALUE" );
      buffer.append( value );

      if (indent != null)
        buffer.append( "\n" );

    }
    if (indent == null)
      buffer.append( " }" );

    return  buffer.toString();
  }

}

   
    
    
    
    
    
    
  

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