FloatingPointType


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   * FloatingPointType.java
26   *
27   * Created on April 5, 2000
28   */
29  
30  package com.sun.jdo.spi.persistence.support.sqlstore.query.util.type;
31  
32  /** 
33   * This class represents the types float and double.
34   *
35   * @author  Michael Bouschen
36   * @version 0.1
37   */
38  public class FloatingPointType
39      extends NumericType
40  {
41      /**
42       *
43       */
44      public FloatingPointType(String   name, Class   clazz, int enumType)
45      {
46          super(name, clazz, enumType);
47      }
48  
49      /**
50       * Converts the specified value into a value of this numeric type.
51       * E.g. an Integer is converted into a Double, if this represents 
52       * the numeric type double.
53       * @param value value to be converted
54       * @return converted value
55       */
56      public Number   getValue(Number   value)
57      {
58          Number   ret = null;
59  
60          if (value == null)
61              ret = null;
62          else if ("double".equals(getName()))
63              ret = new Double  (value.doubleValue());
64          else if ("float".equals(getName()))
65              ret = new Float  (value.floatValue());
66  
67          return ret;
68      }
69  
70      /**
71       * Returns -value. 
72       * @param value value to be negated
73       * @return -value
74       */
75      public Number   negate(Number   value)
76      {
77          Number   ret = null;
78  
79          if (value == null)
80              ret = null;
81          else if ("double".equals(getName()))
82              ret = new Double  (-value.doubleValue());
83          else if ("float".equals(getName()))
84              ret = new Float  (-value.floatValue());
85  
86          return ret;
87      }
88  }
89
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