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1
22
23 package org.xquark.extractor.algebra;
24
25 import java.util.List  ;
26
27 import org.xquark.extractor.common.SqlWrapperException;
28 import org.xquark.extractor.runtime.IDProvider;
29 import org.xquark.extractor.sql.SqlExpression;
30
31 public final class UnOpAggregate extends UnOpProject
32 {
33
34 private static final String RCSRevision = "$Revision: 1.7 $";
35 private static final String RCSName = "$Name: $";
36
37
38 public UnOpAggregate(IDProvider attIdProvider) {
39 super(attIdProvider);
40 }
41
42 public UnOpAggregate(Expression operand, Expression item, IDProvider attIdProvider) {
43 super(operand, item, attIdProvider);
44 }
45
46 public UnOpAggregate(Expression operand, List itemList, boolean distinct, IDProvider attIdProvider) {
47 super(operand, itemList, distinct, attIdProvider);
48 }
49
50 public SqlExpression accept (GenSqlVisitor visitor) throws SqlWrapperException
51 {
52 return visitor.visit(this);
53 }
54
55 public boolean equals(Object obj) {
56 if (null == obj)
57 return false;
58
59 if (obj instanceof UnOpAggregate)
60 return true;
61 else
62 return false;
63 }
64
65 public void accept (AlgebraVisitor visitor) throws SqlWrapperException
66 {
67 visitor.visit(this);
68 }
69
70 void distinctAggregation() {
71 List itemList = getItemList();
72 Expression item = null;
73 for (int i = 0; i < itemList.size(); i++) {
74 item = (Expression)itemList.get(i);
75 item.accept( new DefaultSimpleVisitor() {
76 public void visit(FunAggregate arg)
77 { arg.setDistinct(true); }
78 }
79 );
80 }
81 }
82 }
83 |
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