1 /* JJT: 0.2.2 */
2
3 package mobisnap.mobile_trx;
4
5 import java.util.*;
6
7 /***
8 * Implements expotent expression
9 */
10 public class ASTSQLExpotentExpression extends mobisnap.mobile_trx.SimpleNode {
11 public Vector els;
12
13 public ASTSQLExpotentExpression(int id) {
14 super(id);
15 els = new Vector();
16 }
17
18 public ASTSQLExpotentExpression( MobisnapSQL p, int i) {
19 super( p, i);
20 id = i;
21 els = new Vector();
22 }
23
24 /*** Accept the visitor. **/
25 public Object jjtAccept(MobisnapSQLVisitor visitor, Object data) {
26 return visitor.visit(this, data);
27 }
28
29 /***
30 * Returns the value of the expression
31 *
32 * @param msql_type Specifies which type of processing should be performed
33 * MobisnapConstants.MSQL_SERVER = 1
34 * MobisnapConstants.MSQL_TENTATIVE_CLIENT = 2
35 * MobisnapConstants.MSQL_STABLE_CLIENT = 3
36 * MobisnapConstants.MSQL_RESERVATION_CLIENT = 4
37 * @param cond True if reservations associated iwth transaction should be
38 * propagated to the current transaction
39 */
40 public Object value( int msql_type, boolean cond) throws Exception {
41 int n = els.size();
42 if( n == 0)
43 throw new mobisnap.MobisnapException( "Internal error in expotent expression");
44 Object val = ((SimpleNode)els.elementAt(0)).value( msql_type, cond);
45 for( int i = 1; i < n; i++) {
46 Object aux = ((SimpleNode)els.elementAt( i)).value( msql_type, cond);
47 val = MSQLTypeUtil.pow( val, aux);
48 }
49 return val;
50 }
51
52 /***
53 * Returns a simplified node, if possible (usefull in expressions)
54 *
55 * @param msql_type Specifies which type of processing should be performed
56 * MobisnapConstants.MSQL_SERVER = 1
57 * MobisnapConstants.MSQL_TENTATIVE_CLIENT = 2
58 * MobisnapConstants.MSQL_STABLE_CLIENT = 3
59 * MobisnapConstants.MSQL_RESERVATION_CLIENT = 4
60 * @param cond True if reservations associated iwth transaction should be
61 * propagated to the current transaction
62 */
63 public SimpleNode simplify( int msql_type, boolean cond) {
64 for( int i = 0; i < els.size(); i++)
65 els.setElementAt( ((SimpleNode)els.elementAt(i)).simplify( msql_type, cond), i);
66 if( els.size() == 1)
67 return (SimpleNode)els.elementAt( 0);
68 try {
69 return new SimpleNodeValue( value( msql_type, cond));
70 } catch( Exception e) {
71 return this;
72 }
73 }
74
75
76 }
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