/*

   Derby - Class org.apache.derby.client.am.stmtcache.StatementKeyFactory

   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.derby.client.am.stmtcache;

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


/**
 * A factory for creating JDBC statement keys for use with the JDBC statement
 * cache.
 *
 * @see JDBCStatementCache
 */
//@ThreadSafe
public final class StatementKeyFactory {

    private static final boolean CALLABLE = true;
    private static final boolean PREPARED = false;

    /** Instantiation not allowed. */
    private StatementKeyFactory() {};

    /**
     * Creates a key for a query with default settings.
     * 

     * Defaults are according to the JDBC standard; result set type will be
     * ResultSet.TYPE_FORWARD_ONLY, concurrency will be
     * ResultSet.CONCUR_READ_ONLY and the statement will not
     * return auto-generated keys.
     *
     * @param sql SQL query string
     * @param schema current compilation schema
     * @param holdability result set holdability
     * @return A statement key.
     */
    public static StatementKey newPrepared(
            String sql, String schema, int holdability) {
        return new StatementKey(PREPARED, sql, schema,
                ResultSet.TYPE_FORWARD_ONLY,
                ResultSet.CONCUR_READ_ONLY,
                holdability, Statement.NO_GENERATED_KEYS);
    }

    /**
     * Creates a key for a query specifying whether auto-generated keys
     * shall be returned.
     * 

     * Unspecified settings will be according to the JDBC standard; result set
     * type will be ResultSet.TYPE_FORWARD_ONLY, concurrency will
     * be ResultSet.CONCUR_READ_ONLY.
     *
     * @param sql SQL query string
     * @param schema current compilation schema
     * @param holdability result set holdability
     * @param autogeneratedKeys tells whether or not to reutrn auto-generated
     *      keys
     * @return A statement key.
     */
    public static StatementKey newPrepared(
            String sql, String schema, int holdability, int autogeneratedKeys) {
        return new StatementKey(PREPARED, sql, schema,
                                ResultSet.TYPE_FORWARD_ONLY,
                                ResultSet.CONCUR_READ_ONLY,
                                holdability, autogeneratedKeys);
    }

    /**
     * Creates a key for a query specifying result set type and concurrency.
     * 

     * The returned key is for a statement not returning auto-generated keys.
     *
     * @param sql SQL query string
     * @param schema current compilation schema
     * @param rst result set type
     * @param rsc result set concurrency level
     * @param rsh result set holdability
     * @return A statement key.
     */
    public static StatementKey newPrepared(
            String sql, String schema, int rst, int rsc, int rsh) {
        return new StatementKey(PREPARED, sql, schema, rst, rsc, rsh,
                                Statement.NO_GENERATED_KEYS);
    }

    /**
     * Creates a key for a callable statement.
     * 

     * Unspecified settings will be according to the JDBC standard; result set
     * type will be ResultSet.TYPE_FORWARD_ONLY, concurrency will
     * be ResultSet.CONCUR_READ_ONLY.
     *
     * @param sql SQL query string
     * @param schema current compilation schema
     * @param holdability result set holdability
     * @return A statement key.
     */
    public static StatementKey newCallable(
            String sql, String schema, int holdability) {
        return newCallable(sql, schema, ResultSet.TYPE_FORWARD_ONLY,
                ResultSet.CONCUR_READ_ONLY, holdability);
    }

    /**
     * Creates a key for a callable statement specifying result set type and
     * concurrency.
     * 

     * The returned key is for a statement not returning auto-generated keys.
     *
     * @param sql SQL query string
     * @param schema current compilation schema
     * @param rst result set type
     * @param rsc result set concurrency level
     * @param rsh result set holdability
     * @return A statement key.
     */
    public static StatementKey newCallable(
            String sql, String schema, int rst, int rsc, int rsh) {
        return new StatementKey(CALLABLE, sql, schema, rst, rsc, rsh,
                                Statement.NO_GENERATED_KEYS);
    }
}