/*
* Copyright 2004-2023 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.expression;
import org.h2.engine.SessionLocal;
import org.h2.util.ParserUtil;
import org.h2.value.TypeInfo;
import org.h2.value.Value;
/**
* A user-defined variable, for example: @ID.
*/
public final class Variable extends Operation0 {
private final String name;
private Value lastValue;
public Variable(SessionLocal session, String name) {
this.name = name;
lastValue = session.getVariable(name);
}
@Override
public int getCost() {
return 0;
}
@Override
public StringBuilder getUnenclosedSQL(StringBuilder builder, int sqlFlags) {
return ParserUtil.quoteIdentifier(builder.append('@'), name, sqlFlags);
}
@Override
public TypeInfo getType() {
return lastValue.getType();
}
@Override
public Value getValue(SessionLocal session) {
lastValue = session.getVariable(name);
return lastValue;
}
@Override
public boolean isEverything(ExpressionVisitor visitor) {
switch (visitor.getType()) {
case ExpressionVisitor.DETERMINISTIC:
return false;
default:
return true;
}
}
public String getName() {
return name;
}
}