/*
* 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.api.ErrorCode;
import org.h2.constraint.DomainColumnResolver;
import org.h2.engine.SessionLocal;
import org.h2.message.DbException;
import org.h2.table.ColumnResolver;
import org.h2.util.ParserUtil;
import org.h2.value.TypeInfo;
import org.h2.value.Value;
/**
* An expression representing a value for domain constraint.
*/
public final class DomainValueExpression extends Operation0 {
private DomainColumnResolver columnResolver;
public DomainValueExpression() {
}
@Override
public Value getValue(SessionLocal session) {
return columnResolver.getValue(null);
}
@Override
public TypeInfo getType() {
return columnResolver.getValueType();
}
@Override
public void mapColumns(ColumnResolver resolver, int level, int state) {
if (resolver instanceof DomainColumnResolver) {
columnResolver = (DomainColumnResolver) resolver;
}
}
@Override
public Expression optimize(SessionLocal session) {
if (columnResolver == null) {
throw DbException.get(ErrorCode.COLUMN_NOT_FOUND_1, "VALUE");
}
return this;
}
@Override
public boolean isValueSet() {
return columnResolver.getValue(null) != null;
}
@Override
public StringBuilder getUnenclosedSQL(StringBuilder builder, int sqlFlags) {
if (columnResolver != null) {
String name = columnResolver.getColumnName();
if (name != null) {
return ParserUtil.quoteIdentifier(builder, name, sqlFlags);
}
}
return builder.append("VALUE");
}
@Override
public boolean isEverything(ExpressionVisitor visitor) {
return true;
}
@Override
public int getCost() {
return 1;
}
}