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   
 
Reports generated by Cobertura.