package com.tesora.dve.variables;

/*
 * #%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.sql.Types;
import java.util.Arrays;

import com.tesora.dve.exceptions.PEException;
import com.tesora.dve.resultset.ColumnSet;
import com.tesora.dve.resultset.ResultChunk;
import com.tesora.dve.resultset.ResultColumn;
import com.tesora.dve.resultset.ResultRow;
import com.tesora.dve.variables.ResultCollector.ResultCollectorFactory;


public abstract class ScopedVariableHandler  {

	private static final String RESULT_VALUE_COLUMN_NAME = "Value";

	private final String name;
	
	public ScopedVariableHandler(String name) {
		this.name = name;
	}
	
	public String getName() {
		return name;
	}
	
	public abstract void setValue(String value) throws PEException;
	
	public abstract String getValue() throws PEException;

	public ResultCollector getValueAsResult() throws PEException {
		ColumnSet cs = new ColumnSet();
		cs.addColumn(RESULT_VALUE_COLUMN_NAME, 255, "varchar", Types.VARCHAR);
		ResultColumn rcol = new ResultColumn(getValue());
		ResultRow row = new ResultRow(Arrays.asList(rcol));
		ResultChunk rc = new ResultChunk(Arrays.asList(row));
		return ResultCollectorFactory.getInstance(cs, rc);
	}
}