/*
 * Copyright 2002-2018 the original author or authors.
 *
 * 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 org.springframework.jdbc.object;

import java.util.HashMap;
import java.util.Map;
import javax.sql.DataSource;

import org.springframework.dao.DataAccessException;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.ParameterMapper;
import org.springframework.jdbc.core.SqlParameter;

Superclass for object abstractions of RDBMS stored procedures. This class is abstract and it is intended that subclasses will provide a typed method for invocation that delegates to the supplied execute method. 
The inherited sql property is the name of the stored procedure in the RDBMS. 
Author:
Rod Johnson, Thomas Risberg/**
 * Superclass for object abstractions of RDBMS stored procedures.
 * This class is abstract and it is intended that subclasses will provide a typed
 * method for invocation that delegates to the supplied {@link #execute} method.
 *
 * <p>The inherited {@link #setSql sql} property is the name of the stored procedure
 * in the RDBMS.
 *
 * @author Rod Johnson
 * @author Thomas Risberg
 */
public abstract class StoredProcedure extends SqlCall {

	
Allow use as a bean.
/**
	 * Allow use as a bean.
	 */
	protected StoredProcedure() {
	}

	
Create a new object wrapper for a stored procedure.
Params:
ds – the DataSource to use throughout the lifetime
of this object to obtain connections
name – name of the stored procedure in the database/**
	 * Create a new object wrapper for a stored procedure.
	 * @param ds the DataSource to use throughout the lifetime
	 * of this object to obtain connections
	 * @param name name of the stored procedure in the database
	 */
	protected StoredProcedure(DataSource ds, String name) {
		setDataSource(ds);
		setSql(name);
	}

	
Create a new object wrapper for a stored procedure.
Params:
jdbcTemplate – the JdbcTemplate which wraps DataSource
name – name of the stored procedure in the database/**
	 * Create a new object wrapper for a stored procedure.
	 * @param jdbcTemplate the JdbcTemplate which wraps DataSource
	 * @param name name of the stored procedure in the database
	 */
	protected StoredProcedure(JdbcTemplate jdbcTemplate, String name) {
		setJdbcTemplate(jdbcTemplate);
		setSql(name);
	}


	
StoredProcedure parameter Maps are by default allowed to contain
additional entries that are not actually used as parameters.
/**
	 * StoredProcedure parameter Maps are by default allowed to contain
	 * additional entries that are not actually used as parameters.
	 */
	@Override
	protected boolean allowsUnusedParameters() {
		return true;
	}

	
Declare a parameter. Overridden method. Parameters declared as SqlParameter and SqlInOutParameter will always be used to provide input values. In addition to this any parameter declared as SqlOutParameter where an non-null input value is provided will also be used as an input paraneter. Note: Calls to declareParameter must be made in the same order as
they appear in the database's stored procedure parameter list.
Names are purely used to help mapping.
Params:
param – parameter object/**
	 * Declare a parameter. Overridden method.
	 * Parameters declared as {@code SqlParameter} and {@code SqlInOutParameter}
	 * will always be used to provide input values.  In addition to this any parameter declared
	 * as {@code SqlOutParameter} where an non-null input value is provided will also be used
	 * as an input paraneter.
	 * <b>Note: Calls to declareParameter must be made in the same order as
	 * they appear in the database's stored procedure parameter list.</b>
	 * Names are purely used to help mapping.
	 * @param param parameter object
	 */
	@Override
	public void declareParameter(SqlParameter param) throws InvalidDataAccessApiUsageException {
		if (param.getName() == null) {
			throw new InvalidDataAccessApiUsageException("Parameters to stored procedures must have names as well as types");
		}
		super.declareParameter(param);
	}

	
Execute the stored procedure with the provided parameter values. This is
a convenience method where the order of the passed in parameter values
must match the order that the parameters where declared in.
Params:
inParams – variable number of input parameters. Output parameters should not be included in this map. It is legal for values to be null, and this will produce the correct behavior using a NULL argument to the stored procedure.
Returns:
map of output params, keyed by name as in parameter declarations.
Output parameters will appear here, with their values after the stored procedure
has been called./**
	 * Execute the stored procedure with the provided parameter values. This is
	 * a convenience method where the order of the passed in parameter values
	 * must match the order that the parameters where declared in.
	 * @param inParams variable number of input parameters. Output parameters should
	 * not be included in this map. It is legal for values to be {@code null}, and this
	 * will produce the correct behavior using a NULL argument to the stored procedure.
	 * @return map of output params, keyed by name as in parameter declarations.
	 * Output parameters will appear here, with their values after the stored procedure
	 * has been called.
	 */
	public Map<String, Object> execute(Object... inParams) {
		Map<String, Object> paramsToUse = new HashMap<>();
		validateParameters(inParams);
		int i = 0;
		for (SqlParameter sqlParameter : getDeclaredParameters()) {
			if (sqlParameter.isInputValueProvided() && i < inParams.length) {
				paramsToUse.put(sqlParameter.getName(), inParams[i++]);
			}
		}
		return getJdbcTemplate().call(newCallableStatementCreator(paramsToUse), getDeclaredParameters());
	}

	
Execute the stored procedure. Subclasses should define a strongly typed
execute method (with a meaningful name) that invokes this method, populating
the input map and extracting typed values from the output map. Subclass
execute methods will often take domain objects as arguments and return values.
Alternatively, they can return void.
Params:
inParams – map of input parameters, keyed by name as in parameter declarations. Output parameters need not (but can) be included in this map. It is legal for map entries to be null, and this will produce the correct behavior using a NULL argument to the stored procedure.
Returns:
map of output params, keyed by name as in parameter declarations.
Output parameters will appear here, with their values after the
stored procedure has been called./**
	 * Execute the stored procedure. Subclasses should define a strongly typed
	 * execute method (with a meaningful name) that invokes this method, populating
	 * the input map and extracting typed values from the output map. Subclass
	 * execute methods will often take domain objects as arguments and return values.
	 * Alternatively, they can return void.
	 * @param inParams map of input parameters, keyed by name as in parameter
	 * declarations. Output parameters need not (but can) be included in this map.
	 * It is legal for map entries to be {@code null}, and this will produce the
	 * correct behavior using a NULL argument to the stored procedure.
	 * @return map of output params, keyed by name as in parameter declarations.
	 * Output parameters will appear here, with their values after the
	 * stored procedure has been called.
	 */
	public Map<String, Object> execute(Map<String, ?> inParams) throws DataAccessException {
		validateParameters(inParams.values().toArray());
		return getJdbcTemplate().call(newCallableStatementCreator(inParams), getDeclaredParameters());
	}

	
Execute the stored procedure. Subclasses should define a strongly typed
execute method (with a meaningful name) that invokes this method, passing in
a ParameterMapper that will populate the input map.  This allows mapping database
specific features since the ParameterMapper has access to the Connection object.
The execute method is also responsible for extracting typed values from the output map.
Subclass execute methods will often take domain objects as arguments and return values.
Alternatively, they can return void.
Params:
inParamMapper – map of input parameters, keyed by name as in parameter declarations. Output parameters need not (but can) be included in this map. It is legal for map entries to be null, and this will produce the correct behavior using a NULL argument to the stored procedure.
Returns:
map of output params, keyed by name as in parameter declarations.
Output parameters will appear here, with their values after the
stored procedure has been called./**
	 * Execute the stored procedure. Subclasses should define a strongly typed
	 * execute method (with a meaningful name) that invokes this method, passing in
	 * a ParameterMapper that will populate the input map.  This allows mapping database
	 * specific features since the ParameterMapper has access to the Connection object.
	 * The execute method is also responsible for extracting typed values from the output map.
	 * Subclass execute methods will often take domain objects as arguments and return values.
	 * Alternatively, they can return void.
	 * @param inParamMapper map of input parameters, keyed by name as in parameter
	 * declarations. Output parameters need not (but can) be included in this map.
	 * It is legal for map entries to be {@code null}, and this will produce the correct
	 * behavior using a NULL argument to the stored procedure.
	 * @return map of output params, keyed by name as in parameter declarations.
	 * Output parameters will appear here, with their values after the
	 * stored procedure has been called.
	 */
	public Map<String, Object> execute(ParameterMapper inParamMapper) throws DataAccessException {
		checkCompiled();
		return getJdbcTemplate().call(newCallableStatementCreator(inParamMapper), getDeclaredParameters());
	}

}