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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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 javax.servlet.jsp.jstl.sql;

import java.util.SortedMap;

/**
 * This interface represents the result of a <sql:query>
 * action. It provides access to the following information in the
 * query result:
 *
 * 
 *  The result rows (getRows() and getRowsByIndex())
 * 
 The column names (getColumnNames())
 * 
 The number of rows in the result (getRowCount())
 * 
 An indication whether the rows returned represent the complete result 
 *      or just a subset that is limited by a maximum row setting
 *      (isLimitedByMaxRows())
 * 
 *
 * An implementation of the Result interface provides a
 * disconnected view into the result of a query.
 *
 * @author Justyna Horwat
 *
 */
public interface Result {

    /**
     * 
Returns the result of the query as an array of SortedMap objects. 
     * Each item of the array represents a specific row in the query result.
     *
     * A row is structured as a SortedMap object where the key is the column name, 
     * and where the value is the value associated with the column identified by 
     * the key. The column value is an Object of the Java type corresponding 
     * to the mapping between column types and Java types defined by the JDBC 
     * specification when the ResultSet.getObject() method is used.
     *
     * The SortedMap must use the Comparator 
     * java.util.String.CASE_INSENSITIVE_ORDER. 
     * This makes it possible to access the key as a case insensitive representation 
     * of a column name. This method will therefore work regardless of the case of 
     * the column name returned by the database.
     *
     * @return The result rows as an array of SortedMap objects
     */
    public SortedMap[] getRows();

    /**
     * Returns the result of the query as an array of arrays. 
     * The first array dimension represents a specific row in the query result. 
     * The array elements for each row are Object instances of the Java type 
     * corresponding to the mapping between column types and Java types defined 
     * by the JDBC specification when the ResultSet.getObject() method is used.
     *
     * @return the result rows as an array of Object[] objects
     */
    public Object[][] getRowsByIndex();

    /**
     * Returns the names of the columns in the result. The order of the names in the array 
     * matches the order in which columns are returned in method getRowsByIndex().
     *
     * @return the column names as an array of String objects
     */
    public String[] getColumnNames();

    /**
     * Returns the number of rows in the cached ResultSet
     *
     * @return the number of rows in the result
     */
    public int getRowCount();

    /**
     * Returns true if the query was limited by a maximum row setting
     *
     * @return true if the query was limited by a maximum
     * row setting
     */
    public boolean isLimitedByMaxRows();
}