/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.tuscany.das.rdb.impl;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.List;

import org.apache.tuscany.das.rdb.Command;

import commonj.sdo.DataObject;
import commonj.sdo.helper.XSDHelper;

public abstract class CommandImpl extends BaseCommandImpl implements Command {
    
    protected Statement statement;

    protected Parameters parameters = new Parameters();

   

    protected ResultSetShape resultSetShape;

    public CommandImpl(String sqlString) {
        statement = new Statement(sqlString);

        try {
            URL url = getClass().getResource("/xml/sdoJava.xsd");
            if (url == null) {
                throw new RuntimeException("Could not find resource: xml/sdoJava.xsd");
            }

            InputStream inputStream = url.openStream();
            XSDHelper.INSTANCE.define(inputStream, url.toString());
            inputStream.close();
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        }

    }

    public abstract void execute();

    public abstract DataObject executeQuery();

    public void setParameter(int index, Object value) {
        parameters.setParameter(index, value);
    }

    public void addParameter(ParameterImpl param) {
        parameters.add(param);
    }

    public List getParameters() {
        return parameters.parameterList();
    }

    public Object getParameter(int index) {
        return parameters.parameterWithIndex(index).getValue();
    }

    public void setConnection(ConnectionImpl connection) {
        statement.setConnection(connection);
    }

    protected ConnectionImpl getConnection() {
        return statement.getConnection();
    }

    /*
     * The default impl is to throw an exception. This is overridden by InsertCommandImpl
     */
    public int getGeneratedKey() {

        throw new RuntimeException("This method is only valid for insert commands");
    }

    public void close() {
        statement.close();
    }

}