GMod


1   /* @author rich
2    * Created on 05-Mar-2004
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.groupJep.function;
9   import org.nfunk.jep.function.*;
10  import org.lsmp.djep.groupJep.*;
11  import org.lsmp.djep.groupJep.interfaces.*;
12  
13  import java.util.*;
14  import org.nfunk.jep.*;
15  /**
16   * @author Rich Morris
17   * Created on 05-Mar-2004
18   */
19  public class GMod extends PostfixMathCommand {
20      private HasModI group=null;
21      /**
22       * 
23       */
24      private GMod() {    }
25      public GMod(GroupI group)
26      {
27          numberOfParameters = 2;
28          if(group instanceof HasModI)
29              this.group = (HasModI) group;
30      }
31  
32      /**
33       * Calculates the result of applying the "+" operator to the arguments from
34       * the stack and pushes it back on the stack.
35       */
36      public void run(Stack stack) throws ParseException {
37          checkStack(stack);// check the stack
38          Object   sum = stack.pop();
39          Object   param;
40          param = stack.pop();
41          sum = mod(param, sum);
42          stack.push(sum);
43          return;
44      }
45  
46      public Object   mod(Object   param1, Object   param2) throws ParseException {
47          if(group==null) throw new ParseException("Modulus not implemented for this group.");
48          if (param1 instanceof Number  ) {
49              if (param2 instanceof Number  ) {
50                  return group.mod((Number  )param1, (Number  )param2);
51              }
52          }
53          
54          throw new ParseException("Invalid parameter type");
55      }
56  }
57
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