|
1
5 package org.h2.expression;
6
7 import java.sql.SQLException  ;
8
9 import org.h2.engine.Session;
10 import org.h2.table.ColumnResolver;
11 import org.h2.table.TableFilter;
12 import org.h2.value.Value;
13 import org.h2.value.ValueArray;
14
15 public class ExpressionList extends Expression {
16
17 private Expression[] list;
18
19 public ExpressionList(Expression[] list) {
20 this.list = list;
21 }
22
23 public Value getValue(Session session) throws SQLException {
24 Value[] v = new Value[list.length];
25 for(int i=0; i<list.length; i++) {
26 v[i] = list[i].getValue(session);
27 }
28 return ValueArray.get(v);
29 }
30
31 public int getType() {
32 return Value.ARRAY;
33 }
34
35 public void mapColumns(ColumnResolver resolver, int level) throws SQLException {
36 for(int i=0; i<list.length; i++) {
37 list[i].mapColumns(resolver, level);
38 }
39 }
40
41 public Expression optimize(Session session) throws SQLException {
42 boolean allConst = true;
43 for(int i=0; i<list.length; i++) {
44 Expression e = list[i].optimize(session);
45 if(!e.isConstant()) {
46 allConst = false;
47 }
48 list[i] = e;
49 }
50 if(allConst) {
51 return ValueExpression.get(getValue(session));
52 }
53 return this;
54 }
55
56 public void setEvaluatable(TableFilter tableFilter, boolean b) {
57 for(int i=0; i<list.length; i++) {
58 list[i].setEvaluatable(tableFilter, b);
59 }
60 }
61
62 public int getScale() {
63 return 0;
64 }
65
66 public long getPrecision() {
67 return 0;
68 }
69
70 public String getSQL() {
71 StringBuffer buff = new StringBuffer ();
72 buff.append('(');
73 for (int i = 0; i < list.length; i++) {
74 if (i > 0) {
75 buff.append(", ");
76 }
77 buff.append(list[i].getSQL());
78 }
79 buff.append(')');
80 return buff.toString();
81 }
82
83 public void updateAggregate(Session session) throws SQLException {
84 for (int i = 0; i < list.length; i++) {
85 list[i].updateAggregate(session);
86 }
87 }
88
89 public boolean isEverything(ExpressionVisitor visitor) {
90 for (int i = 0; i < list.length; i++) {
91 if(!list[i].isEverything(visitor)) {
92 return false;
93 }
94 }
95 return true;
96 }
97
98 public int getCost() {
99 int cost = 1;
100 for(int i=0; i<list.length; i++) {
101 cost += list[i].getCost();
102 }
103 return cost;
104 }
105
106 }
107 |
Popular Tags |
Java API By Example, From Geeks To Geeks.