package com.tesora.dve.sql.node.test;
/*
* #%L
* Tesora Inc.
* Database Virtualization Engine
* %%
* Copyright (C) 2011 - 2014 Tesora Inc.
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* #L%
*/
import com.tesora.dve.sql.expression.TableKey;
import com.tesora.dve.sql.node.DerivedAttribute;
import com.tesora.dve.sql.node.LanguageNode;
import com.tesora.dve.sql.schema.Database;
import com.tesora.dve.sql.schema.SchemaContext;
import com.tesora.dve.sql.statement.dml.DMLStatement;
import com.tesora.dve.sql.util.ListSet;
public class Databases extends DerivedAttribute<ListSet<Database<?>>> {
@Override
public boolean isApplicableSubject(LanguageNode ln) {
return (ln instanceof DMLStatement);
}
@Override
public ListSet<Database<?>> computeValue(SchemaContext sc, LanguageNode ln) {
ListSet<TableKey> tabs = EngineConstant.TABLES_INC_NESTED.getValue(ln,sc);
ListSet<Database<?>> dbs = new ListSet<Database<?>>();
for(TableKey tk : tabs) {
dbs.add(tk.getTable().getDatabase(sc));
}
return dbs;
}
}