package com.tesora.dve.sql.transform.execution;

/*
 * #%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 java.util.List;

import com.tesora.dve.db.Emitter.EmitOptions;
import com.tesora.dve.exceptions.PEException;
import com.tesora.dve.queryplan.QueryStepOperation;
import com.tesora.dve.resultset.ProjectionInfo;
import com.tesora.dve.sql.schema.ConnectionValues;
import com.tesora.dve.sql.schema.SchemaContext;

public class EmptyExecutionStep extends ExecutionStep {

	private long updateCount;
	private String sql;
	
	public EmptyExecutionStep(long updateCount, String command) {
		super(null, null, null);
		this.updateCount = updateCount;
		this.sql = command;
	}


	@Override
	public void getSQL(SchemaContext sc, ConnectionValuesMap cvm, ExecutionPlan containing, List<String> buf, EmitOptions opts) {
		buf.add(sql);
	}

	@Override
	public Long getUpdateCount(SchemaContext sc, ConnectionValues cv) {
		return updateCount;
	}


	@Override
	public void schedule(ExecutionPlanOptions opts, List<QueryStepOperation> qsteps, ProjectionInfo projection, SchemaContext sc,
			ConnectionValuesMap cv, ExecutionPlan ep)
			throws PEException {
	}	
	
	@Override
	public void display(SchemaContext sc, ConnectionValuesMap cvm, ExecutionPlan containing, List<String> buf, String indent, EmitOptions opts) {
		buf.add(indent + sql);
	}

}