MathType


1   /*
2    * The contents of this file are subject to the terms 
3    * of the Common Development and Distribution License 
4    * (the License).  You may not use this file except in
5    * compliance with the License.
6    * 
7    * You can obtain a copy of the license at 
8    * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9    * glassfish/bootstrap/legal/CDDLv1.0.txt.
10   * See the License for the specific language governing 
11   * permissions and limitations under the License.
12   * 
13   * When distributing Covered Code, include this CDDL 
14   * Header Notice in each file and include the License file 
15   * at glassfish/bootstrap/legal/CDDLv1.0.txt.  
16   * If applicable, add the following below the CDDL Header, 
17   * with the fields enclosed by brackets [] replaced by
18   * you own identifying information: 
19   * "Portions Copyrighted [year] [name of copyright owner]"
20   * 
21   * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22   */
23  
24  /*
25   * MathType.java
26   *
27   * Created on August 24, 2001
28   */
29  
30  package com.sun.jdo.spi.persistence.support.sqlstore.query.util.type;
31  
32  import java.math.BigDecimal  ;
33  import java.math.BigInteger  ;
34  
35  /** 
36   * This class represents the types java.math.BigDecimal and java.math.BigInteger.
37   *
38   *
39   * @author  Michael Bouschen
40   * @version 0.1
41   */
42  public class MathType
43      extends ClassType
44      implements NumberType
45  {
46      /**
47       *
48       */
49      public MathType(String   name, Class   clazz, int enumType, TypeTable typetab)
50      {
51          super(name, clazz, enumType, typetab);
52      }
53      
54      /**
55       * A numeric wrapper class type defines an ordering.
56       */
57      public boolean isOrderable()
58      {
59          return true;
60      }
61  
62      /**
63       * Converts the specified value into a value of this numeric type.
64       * E.g. an Integer is converted into a BigDecimal, if this represents 
65       * the type BigDecimal.
66       * @param value value to be converted
67       * @return converted value
68       */
69      public Number   getValue(Number   value)
70      {
71          Number   ret = null;
72  
73          if (value == null)
74              ret = null;
75          else if ("java.math.BigDecimal".equals(getName()))
76          {
77              if (value instanceof BigDecimal  )
78                  ret = value;
79              else if (value instanceof BigInteger  )
80                  ret = new BigDecimal  ((BigInteger  )value);
81              else if (value instanceof Double  )
82                  ret = new BigDecimal  (((Double  )value).toString());
83              else if (value instanceof Float  )
84                  ret = new BigDecimal  (((Float  )value).toString());
85              else if (value instanceof Number  )
86                  ret = BigDecimal.valueOf(((Number  )value).longValue());
87          }
88          else if ("java.math.BigInteger".equals(getName()))
89          {
90              if (value instanceof BigInteger  )
91                  ret = value;
92              else if (value instanceof Double  )
93                  ret = (new BigDecimal  (((Double  )value).toString())).toBigInteger();
94              else if (value instanceof Float  )
95                  ret = (new BigDecimal  (((Float  )value).toString())).toBigInteger();
96              else if (value instanceof Number  )
97                  ret = BigInteger.valueOf(((Number  )value).longValue());
98          }
99          
100         return ret;
101     }
102 
103     /**
104      * Returns -value. 
105      * @param value value to be negated
106      * @return -value
107      */
108     public Number   negate(Number   value)
109     {
110         Number   ret = null;
111 
112         if (value == null)
113             ret = null;
114         else if ("java.math.BigDecimal".equals(getName()))
115         {
116             if (value instanceof BigDecimal  )
117                 ret = ((BigDecimal  )value).negate();
118             else if (value instanceof BigInteger  )
119                 ret = new BigDecimal  (((BigInteger  )value).negate());
120             else if (value instanceof Double  )
121                 ret = (new BigDecimal  (((Double  )value).toString())).negate();
122             else if (value instanceof Float  )
123                 ret = (new BigDecimal  (((Float  )value).toString())).negate();
124             else if (value instanceof Number  )
125                 ret = BigDecimal.valueOf(-((Number  )value).longValue());
126         }
127         else if ("java.math.BigInteger".equals(getName()))
128         {
129             if (value instanceof BigInteger  )
130                 ret = ((BigInteger  )value).negate();
131             else if (value instanceof Double  )
132                 ret = (new BigDecimal  (((Double  )value).toString())).negate().toBigInteger();
133             else if (value instanceof Float  )
134                 ret = (new BigDecimal  (((Float  )value).toString())).negate().toBigInteger();
135             else if (value instanceof Number  )
136                 ret = BigInteger.valueOf(-((Number  )value).longValue());
137         }
138         
139         return ret;
140     }
141     
142 }
143
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