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/*
 * 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.commons.dbutils;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;

/**
 * RowProcessor implementations convert
 * ResultSet rows into various other objects.  Implementations
 * can extend BasicRowProcessor to protect themselves
 * from changes to this interface.
 *
 * @see BasicRowProcessor
 */
public interface RowProcessor {

    /**
     * Create an Object[] from the column values in one
     * ResultSet row.  The ResultSet should be
     * positioned on a valid row before passing it to this method.
     * Implementations of this method must not alter the row position of
     * the ResultSet.
     *
     * @param rs ResultSet that supplies the array data
     * @throws SQLException if a database access error occurs
     * @return the newly created array
     */
    Object[] toArray(ResultSet rs) throws SQLException;

    /**
     * Create a JavaBean from the column values in one ResultSet
     * row.  The ResultSet should be positioned on a valid row before
     * passing it to this method.  Implementations of this method must not
     * alter the row position of the ResultSet.
     * @param  The type of bean to create
     * @param rs ResultSet that supplies the bean data
     * @param type Class from which to create the bean instance
     * @throws SQLException if a database access error occurs
     * @return the newly created bean
     */
     T toBean(ResultSet rs, Class type) throws SQLException;

    /**
     * Create a List of JavaBeans from the column values in all
     * ResultSet rows.  ResultSet.next() should
     * not be called before passing it to this method.
     * @param  The type of bean to create
     * @param rs ResultSet that supplies the bean data
     * @param type Class from which to create the bean instance
     * @throws SQLException if a database access error occurs
     * @return A List of beans with the given type in the order
     * they were returned by the ResultSet.
     */
     List toBeanList(ResultSet rs, Class type) throws SQLException;

    /**
     * Create a Map from the column values in one
     * ResultSet row.  The ResultSet should be
     * positioned on a valid row before
     * passing it to this method.  Implementations of this method must not
     * alter the row position of the ResultSet.
     *
     * @param rs ResultSet that supplies the map data
     * @throws SQLException if a database access error occurs
     * @return the newly created Map
     */
    Map toMap(ResultSet rs) throws SQLException;

}