/*
 *  Copyright (c) 2005-2012, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 *  WSO2 Inc. licenses this file to you under the Apache License,
 *  Version 2.0 (the "License"); you may not use this file except
 *  in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 *
 */
package org.wso2.carbon.dataservices.sql.driver.query.delete;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import org.wso2.carbon.dataservices.sql.driver.TCustomConnection;
import org.wso2.carbon.dataservices.sql.driver.processor.reader.DataTable;

/**
 * This class represents a delete query for custom data sources.
 */
public class CustomDeleteQuery extends DeleteQuery {

	public CustomDeleteQuery(Statement stmt) throws SQLException {
		super(stmt);
	}

	@Override
	public ResultSet executeQuery() throws SQLException {
		this.executeUpdate();
		return null;
	}

	@Override
	public int executeUpdate() throws SQLException {
		if (!(this.getConnection() instanceof TCustomConnection)) {
            throw new SQLException("Connection does not refer to a Custom connection");
        }
		DataTable table = ((TCustomConnection) this.getConnection()).getDataSource().getDataTable(
				this.getTargetTableName());
		if (table == null) {
			throw new SQLException("The custom data table '" + 
					this.getTargetTableName() + "' does not exist");
		}
		Integer[] ids = this.getResultantRows().keySet().toArray(new Integer[0]);
		int[] intIds = new int[ids.length];
		for (int i = 0; i < ids.length; i++) {
			intIds[i] = ids[i];
		}
		table.deleteRows(intIds);
		return intIds.length;
	}

	@Override
	public boolean execute() throws SQLException {
		this.executeUpdate();
		return true;
	}

}
