?? expressionlist.java
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/*
* Copyright 2004-2008 H2 Group. Licensed under the H2 License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.expression;
import java.sql.SQLException;
import org.h2.engine.Session;
import org.h2.table.ColumnResolver;
import org.h2.table.TableFilter;
import org.h2.value.Value;
import org.h2.value.ValueArray;
/**
* A list of expressions, as in (ID, NAME).
* The result of this expression is an array.
*/
public class ExpressionList extends Expression {
private Expression[] list;
public ExpressionList(Expression[] list) {
this.list = list;
}
public Value getValue(Session session) throws SQLException {
Value[] v = new Value[list.length];
for (int i = 0; i < list.length; i++) {
v[i] = list[i].getValue(session);
}
return ValueArray.get(v);
}
public int getType() {
return Value.ARRAY;
}
public void mapColumns(ColumnResolver resolver, int level) throws SQLException {
for (int i = 0; i < list.length; i++) {
list[i].mapColumns(resolver, level);
}
}
public Expression optimize(Session session) throws SQLException {
boolean allConst = true;
for (int i = 0; i < list.length; i++) {
Expression e = list[i].optimize(session);
if (!e.isConstant()) {
allConst = false;
}
list[i] = e;
}
if (allConst) {
return ValueExpression.get(getValue(session));
}
return this;
}
public void setEvaluatable(TableFilter tableFilter, boolean b) {
for (int i = 0; i < list.length; i++) {
list[i].setEvaluatable(tableFilter, b);
}
}
public int getScale() {
return 0;
}
public long getPrecision() {
return Integer.MAX_VALUE;
}
public int getDisplaySize() {
return Integer.MAX_VALUE;
}
public String getSQL() {
StringBuffer buff = new StringBuffer();
buff.append('(');
for (int i = 0; i < list.length; i++) {
if (i > 0) {
buff.append(", ");
}
buff.append(list[i].getSQL());
}
buff.append(')');
return buff.toString();
}
public void updateAggregate(Session session) throws SQLException {
for (int i = 0; i < list.length; i++) {
list[i].updateAggregate(session);
}
}
public boolean isEverything(ExpressionVisitor visitor) {
for (int i = 0; i < list.length; i++) {
if (!list[i].isEverything(visitor)) {
return false;
}
}
return true;
}
public int getCost() {
int cost = 1;
for (int i = 0; i < list.length; i++) {
cost += list[i].getCost();
}
return cost;
}
}
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