package com.tesora.dve.sql.statement.session;

/*
 * #%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.db.DBResultConsumer;
import com.tesora.dve.exceptions.PEException;
import com.tesora.dve.queryplan.ExecutionState;
import com.tesora.dve.queryplan.QueryStepGeneralOperation.AdhocOperation;
import com.tesora.dve.server.connectionmanager.SSConnection;
import com.tesora.dve.sql.schema.PEDatabase;
import com.tesora.dve.sql.schema.SchemaContext;
import com.tesora.dve.sql.schema.mt.PETenant;
import com.tesora.dve.sql.transform.behaviors.BehaviorConfiguration;
import com.tesora.dve.sql.transform.execution.ExecutionSequence;
import com.tesora.dve.sql.transform.execution.TransientSessionExecutionStep;
import com.tesora.dve.worker.WorkerGroup;

public class UseTenantStatement extends UseStatement {

	PEDatabase db;
	
	public UseTenantStatement(PETenant pet, PEDatabase ped) {
		super(pet);
		db = ped;
	}

	public PETenant getTenant() {
		return (PETenant) getTarget();
	}
	
	@Override
	public PEDatabase getDatabase(SchemaContext pc) {
		return db;
	}

	@Override
	public void plan(SchemaContext pc, ExecutionSequence es, BehaviorConfiguration config) throws PEException {
		pc.beginSaveContext();
		try {
			final PETenant ten = getTenant();
			es.append(new TransientSessionExecutionStep(getSQL(pc), new AdhocOperation() {
				@Override
				public void execute(ExecutionState estate, WorkerGroup wg, DBResultConsumer resultConsumer) throws Throwable {
					SSConnection ssCon = estate.getConnection();
					ssCon.setCurrentDatabase(db);
					ssCon.setCurrentTenant(ten);
				}
			}));
		} finally {
			pc.endSaveContext();
		}
	}
}