Coverage Report - net.wotonomy.datastore.DefaultComparator
 
Classes in this File Line Coverage Branch Coverage Complexity
DefaultComparator
0% 
0% 
15
 
 1  
 /*
 2  
 Wotonomy: OpenStep design patterns for pure Java applications.
 3  
 Copyright (C) 2000 Michael Powers
 4  
 
 5  
 This library is free software; you can redistribute it and/or
 6  
 modify it under the terms of the GNU Lesser General Public
 7  
 License as published by the Free Software Foundation; either
 8  
 version 2.1 of the License, or (at your option) any later version.
 9  
 
 10  
 This library is distributed in the hope that it will be useful,
 11  
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 13  
 Lesser General Public License for more details.
 14  
 
 15  
 You should have received a copy of the GNU Lesser General Public
 16  
 License along with this library; if not, see http://www.gnu.org
 17  
 */
 18  
 
 19  
 package net.wotonomy.datastore;
 20  
 
 21  
 import java.io.Serializable;
 22  
 import java.util.Comparator;
 23  
 
 24  
 import net.wotonomy.foundation.internal.ValueConverter;
 25  
 
 26  
 /**
 27  
 * DefaultComparator exists to compare basic java 
 28  
 * primitive wrappers, since these classes don't
 29  
 * implement Comparable in jdk 1.1.x. Also uses 
 30  
 * ValueConverter to try to match types for comparison.
 31  
 */
 32  0
 public class DefaultComparator implements Comparator, Serializable
 33  
 {
 34  
     public int compare(Object o1, Object o2)
 35  
     {
 36  
 // System.out.println( "compare: " + o1 + " : " + o1.getClass() + " : " + o2 + " : " + o2.getClass() );
 37  
 /*
 38  
             if ( ( o1 instanceof Comparable ) && ( o2 instanceof Comparable ) )
 39  
         {
 40  
             return ((Comparable)o1).compareTo( o2 );
 41  
         }
 42  
 */    
 43  0
             if ( ( o1 instanceof Number ) && ( o2 instanceof Number ) )
 44  
         {
 45  
             // TODO: special case for each type would be faster
 46  0
             return (int)
 47  0
                 ( ((Number)o1).doubleValue() - ((Number)o2).doubleValue() );
 48  
         }
 49  
         
 50  0
             if ( o1 instanceof StringBuffer )
 51  
         {
 52  0
             o1 = o1.toString();
 53  
         }
 54  0
             if ( o2 instanceof StringBuffer )
 55  
         {
 56  0
             o2 = o2.toString();
 57  
         }
 58  
         
 59  0
             if ( ( o1 instanceof String ) && ( o2 instanceof String ) )
 60  
         {
 61  0
             return ((String)o1).compareTo( ((String)o2) );
 62  
         }
 63  
         
 64  0
             if ( ( o1 instanceof Character ) && ( o2 instanceof Character ) )
 65  
         {
 66  0
             return (int)
 67  0
                 ((Character)o1).charValue() - ((Character)o2).charValue();
 68  
         }
 69  
         
 70  0
             if ( ( o1 instanceof Byte ) && ( o2 instanceof Byte ) )
 71  
         {
 72  0
             return (int)
 73  0
                 ((Byte)o1).byteValue() - ((Byte)o2).byteValue();
 74  
         }
 75  
         
 76  0
             if ( ( o1 instanceof Boolean ) && ( o2 instanceof Boolean ) )
 77  
         {
 78  0
             if ( o1.equals( o2 ) ) return 0;
 79  
 
 80  
             // presumably TRUE is greater than FALSE
 81  0
             if ( o1.equals( Boolean.TRUE ) ) return 1;
 82  0
             return -1;
 83  
         }
 84  
         
 85  
         // handle all NULL cases: NULL is less than anything else.
 86  0
         if ( ( o1 == null ) && ( o2 == null ) ) return 0;
 87  0
         if ( ( o1 == null ) && ( o2 != null ) ) return -1;
 88  0
         if ( ( o2 == null ) && ( o1 != null ) ) return 1;
 89  
         
 90  0
         if ( o1.getClass() != o2.getClass() )
 91  
         {
 92  
             Object convertedValue;
 93  
 
 94  0
             if ( ! ( o2 instanceof String ) )
 95  
             // (string should be lowest common demoninator, if possible)
 96  
             {
 97  
                     // convert first to second's type
 98  0
                     convertedValue =
 99  0
                         ValueConverter.convertObjectToClass( o1, o2.getClass() );
 100  0
                     if ( convertedValue != null )
 101  
                     {
 102  0
                         return compare( convertedValue, o2 );
 103  
                     }
 104  
             }
 105  
 
 106  
             // convert second to first's type
 107  0
             convertedValue =
 108  0
                 ValueConverter.convertObjectToClass( o2, o1.getClass() );
 109  0
             if ( convertedValue != null )
 110  
             {
 111  0
                 return -1 * compare( convertedValue, o1 ); // reverse result
 112  
             }
 113  
         }
 114  
 
 115  
         // we tried really hard, but these values are incomparable:
 116  
         // we'll consider them equal.
 117  0
         return 0;
 118  
     }
 119  
 
 120  
     public boolean equals(Object obj)
 121  
     {
 122  0
             return (obj == this);
 123  
     }
 124  
 }
 125  
 
 126  
 /*
 127  
  * $Log$
 128  
  * Revision 1.2  2006/02/19 16:26:19  cgruber
 129  
  * Move non-unit-test code to tests project
 130  
  * Fix up code to work with proper imports
 131  
  * Fix maven dependencies.
 132  
  *
 133  
  * Revision 1.1  2006/02/16 13:18:56  cgruber
 134  
  * Check in all sources in eclipse-friendly maven-enabled packages.
 135  
  *
 136  
  * Revision 1.1.1.1  2000/12/21 15:47:08  mpowers
 137  
  * Contributing wotonomy.
 138  
  *
 139  
  * Revision 1.3  2000/12/20 16:25:36  michael
 140  
  * Added log to all files.
 141  
  *
 142  
  *
 143  
  */
 144  
 
 145