Scaler


1   /* @author rich
2    * Created on 04-Nov-2003
3    *
4    * This code is covered by a Creative Commons
5    * Attribution, Non Commercial, Share Alike license
6    * <a HREF="http://creativecommons.org/licenses/by-nc-sa/1.0">License</a>
7    */
8   package org.lsmp.djep.vectorJep.values;
9   
10  import org.lsmp.djep.vectorJep.*;
11  
12  /**
13   * Degenerate i.e. rank 0 Tensor. Just has a single element.
14   * @author Rich Morris
15   * Created on 04-Nov-2003
16   * @version 1.3.0.2 now extends number
17   */
18  public class Scaler extends Number   implements MatrixValueI {
19  
20      Object   value = new Double  (0.0);
21      public Dimensions getDim() {return Dimensions.ONE; }
22      public int getNumEles() { return 1; }
23      public void setEle(int i, Object   value) {if(value!=null) this.value = value;}
24      public Object   getEle(int i) {return value; }
25  //  public void setValue(Object value) { this.value = value;}
26  //  public Object getValue() {return value; }
27      public String   toString() { return value.toString(); }
28      /** sets the elements to those of the arguments. */
29      public void setEles(MatrixValueI val)
30      {
31          if(!(val.getDim().equals(Dimensions.ONE))) return;
32          value = val.getEle(0);
33      }
34      
35      /** value of constant coeff. */ 
36      public int intValue() {return ((Number  ) value).intValue();  }
37      /** value of constant coeff. */ 
38      public long longValue() {return ((Number  ) value).longValue();   }
39      /** value of constant coeff. */ 
40      public float floatValue() { return ((Number  ) value).floatValue();   }
41      /** value of constant coeff. */ 
42      public double doubleValue() {return ((Number  ) value).doubleValue(); }
43  
44      public boolean equals(Object   obj) {
45          if(!(obj instanceof Scaler)) return false;
46          Scaler s = (Scaler) obj;
47          if(!s.getDim().equals(getDim())) return false;
48          if(!value.equals(s.value)) return false;
49          return true;
50      }
51      
52      /**
53       * Always override hashCode when you override equals.
54       * Efective Java, Joshua Bloch, Sun Press
55       */
56      public int hashCode() {
57          int result = 17;
58              result = 37*result+ value.hashCode();
59          return result;
60      }
61  
62  }
63
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