/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.language;
import org.teiid.language.visitor.LanguageObjectVisitor;
/**
* Represents a scalar subquery. That is, a query that is evaluated as a scalar
* expression and returns a single value. The inner subquery must return exactly
* 1 column as well.
*/
public class ScalarSubquery extends BaseLanguageObject implements Expression, SubqueryContainer {
private QueryExpression query;
public ScalarSubquery(QueryExpression query) {
this.query = query;
}
@Override
public QueryExpression getSubquery() {
return this.query;
}
@Override
public void setSubquery(QueryExpression query) {
this.query = query;
}
public void acceptVisitor(LanguageObjectVisitor visitor) {
visitor.visit(this);
}
@Override
public Class<?> getType() {
return query.getProjectedQuery().getDerivedColumns().get(0).getExpression().getType();
}
}