/*
 * Copyright 2002-2014 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.core.simple;

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

import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.BatchUpdateUtils;
import org.springframework.jdbc.core.JdbcOperations;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.util.ObjectUtils;

/**
 * Java-5-based convenience wrapper for the classic Spring
 * {@link org.springframework.jdbc.core.JdbcTemplate},
 * taking advantage of varargs and autoboxing, and exposing only the most
 * commonly required operations in order to simplify JdbcTemplate usage.
 *
 * <p>Use the {@link #getJdbcOperations()} method (or a straight JdbcTemplate)
 * if you need to invoke less commonly used template methods. This includes
 * any methods specifying SQL types, methods using less commonly used callbacks
 * such as RowCallbackHandler, updates with PreparedStatementSetters rather than
 * argument arrays, and stored procedures as well as batch operations.
 *
 * <p><b>NOTE: An instance of this class is thread-safe once configured.</b>
 *
 * @author Rod Johnson
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @author Thomas Risberg
 * @since 2.0
 * @see ParameterizedRowMapper
 * @see SimpleJdbcDaoSupport
 * @see org.springframework.jdbc.core.JdbcTemplate
 * @deprecated since Spring 3.1 in favor of {@link org.springframework.jdbc.core.JdbcTemplate} and
 * {@link org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate}. The JdbcTemplate and
 * NamedParameterJdbcTemplate now provide all the functionality of the SimpleJdbcTemplate.
 */
@Deprecated
public class SimpleJdbcTemplate implements SimpleJdbcOperations {

	/** The NamedParameterJdbcTemplate that we are wrapping */
	private final NamedParameterJdbcOperations namedParameterJdbcOperations;


	/**
	 * Create a new SimpleJdbcTemplate for the given DataSource.
	 * <p>Creates a classic Spring JdbcTemplate and wraps it.
	 * @param dataSource the JDBC DataSource to access
	 */
	public SimpleJdbcTemplate(DataSource dataSource) {
		this.namedParameterJdbcOperations = new NamedParameterJdbcTemplate(dataSource);
	}

	/**
	 * Create a new SimpleJdbcTemplate for the given classic Spring JdbcTemplate.
	 * @param classicJdbcTemplate the classic Spring JdbcTemplate to wrap
	 */
	public SimpleJdbcTemplate(JdbcOperations classicJdbcTemplate) {
		this.namedParameterJdbcOperations = new NamedParameterJdbcTemplate(classicJdbcTemplate);
	}

	/**
	 * Create a new SimpleJdbcTemplate for the given Spring NamedParameterJdbcTemplate.
	 * @param namedParameterJdbcTemplate the Spring NamedParameterJdbcTemplate to wrap
	 */
	public SimpleJdbcTemplate(NamedParameterJdbcOperations namedParameterJdbcTemplate) {
		this.namedParameterJdbcOperations = namedParameterJdbcTemplate;
	}


	/**
	 * Expose the classic Spring JdbcTemplate to allow invocation of
	 * less commonly used methods.
	 */
	@Override
	public JdbcOperations getJdbcOperations() {
		return this.namedParameterJdbcOperations.getJdbcOperations();
	}

	/**
	 * Expose the Spring NamedParameterJdbcTemplate to allow invocation of
	 * less commonly used methods.
	 */
	@Override
	public NamedParameterJdbcOperations getNamedParameterJdbcOperations() {
		return this.namedParameterJdbcOperations;
	}


	@Override
	public int queryForInt(String sql, Map<String, ?> args) throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForInt(sql, args);
	}

	@Override
	public int queryForInt(String sql, SqlParameterSource args) throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForInt(sql, args);
	}

	@Override
	public int queryForInt(String sql, Object... args) throws DataAccessException {
		return (ObjectUtils.isEmpty(args) ?
					getJdbcOperations().queryForInt(sql) :
					getJdbcOperations().queryForInt(sql, getArguments(args)));
	}

	@Override
	public long queryForLong(String sql, Map<String, ?> args) throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForLong(sql, args);
	}

	@Override
	public long queryForLong(String sql, SqlParameterSource args) throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForLong(sql, args);
	}

	@Override
	public long queryForLong(String sql, Object... args) throws DataAccessException {
		return (ObjectUtils.isEmpty(args) ?
					getJdbcOperations().queryForLong(sql) :
					getJdbcOperations().queryForLong(sql, getArguments(args)));
	}

	@Override
	public <T> T queryForObject(String sql, Class<T> requiredType, Map<String, ?> args) throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForObject(sql, args, requiredType);
	}

	@Override
	public <T> T queryForObject(String sql, Class<T> requiredType, SqlParameterSource args)
			throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForObject(sql, args, requiredType);
	}

	@Override
	public <T> T queryForObject(String sql, Class<T> requiredType, Object... args) throws DataAccessException {
		return (ObjectUtils.isEmpty(args) ?
				getJdbcOperations().queryForObject(sql, requiredType) :
				getJdbcOperations().queryForObject(sql, getArguments(args), requiredType));
	}

	@Override
	public <T> T queryForObject(String sql, RowMapper<T> rm, Map<String, ?> args) throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForObject(sql, args, rm);
	}

	@Override
	@Deprecated
	public <T> T queryForObject(String sql, ParameterizedRowMapper<T> rm, Map<String, ?> args) throws DataAccessException {
		return queryForObject(sql, (RowMapper<T>) rm, args);
	}

	@Override
	public <T> T queryForObject(String sql, RowMapper<T> rm, SqlParameterSource args)
			throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForObject(sql, args, rm);
	}

	@Override
	@Deprecated
	public <T> T queryForObject(String sql, ParameterizedRowMapper<T> rm, SqlParameterSource args)
			throws DataAccessException {
		return queryForObject(sql, (RowMapper<T>) rm, args);
	}

	@Override
	public <T> T queryForObject(String sql, RowMapper<T> rm, Object... args) throws DataAccessException {
		return (ObjectUtils.isEmpty(args) ?
				getJdbcOperations().queryForObject(sql, rm):
				getJdbcOperations().queryForObject(sql, getArguments(args), rm));
	}

	@Override
	@Deprecated
	public <T> T queryForObject(String sql, ParameterizedRowMapper<T> rm, Object... args) throws DataAccessException {
		return queryForObject(sql, (RowMapper<T>) rm, args);
	}

	@Override
	public <T> List<T> query(String sql, RowMapper<T> rm, Map<String, ?> args) throws DataAccessException {
		return getNamedParameterJdbcOperations().query(sql, args, rm);
	}

	@Override
	@Deprecated
	public <T> List<T> query(String sql, ParameterizedRowMapper<T> rm, Map<String, ?> args) throws DataAccessException {
		return query(sql, (RowMapper<T>) rm, args);
	}

	@Override
	public <T> List<T> query(String sql, RowMapper<T> rm, SqlParameterSource args)
			throws DataAccessException {
		return getNamedParameterJdbcOperations().query(sql, args, rm);
	}

	@Override
	@Deprecated
	public <T> List<T> query(String sql, ParameterizedRowMapper<T> rm, SqlParameterSource args)
			throws DataAccessException {
		return query(sql, (RowMapper<T>) rm, args);
	}

	@Override
	public <T> List<T> query(String sql, RowMapper<T> rm, Object... args) throws DataAccessException {
		return (ObjectUtils.isEmpty(args) ?
				getJdbcOperations().query(sql, rm) :
				getJdbcOperations().query(sql, getArguments(args), rm));
	}

	@Override
	@Deprecated
	public <T> List<T> query(String sql, ParameterizedRowMapper<T> rm, Object... args) throws DataAccessException {
		return query(sql, (RowMapper<T>) rm, args);
	}

	@Override
	public Map<String, Object> queryForMap(String sql, Map<String, ?> args) throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForMap(sql, args);
	}

	@Override
	public Map<String, Object> queryForMap(String sql, SqlParameterSource args)
			throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForMap(sql, args);
	}

	@Override
	public Map<String, Object> queryForMap(String sql, Object... args) throws DataAccessException {
		return (ObjectUtils.isEmpty(args) ?
				getJdbcOperations().queryForMap(sql) :
				getJdbcOperations().queryForMap(sql, getArguments(args)));
	}

	@Override
	public List<Map<String, Object>> queryForList(String sql, Map<String, ?> args) throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForList(sql, args);
	}

	@Override
	public List<Map<String, Object>> queryForList(String sql, SqlParameterSource args)
			throws DataAccessException {
		return getNamedParameterJdbcOperations().queryForList(sql, args);
	}

	@Override
	public List<Map<String, Object>> queryForList(String sql, Object... args) throws DataAccessException {
		return (ObjectUtils.isEmpty(args) ?
				getJdbcOperations().queryForList(sql) :
				getJdbcOperations().queryForList(sql, getArguments(args)));
	}

	@Override
	public int update(String sql, Map<String, ?> args) throws DataAccessException {
		return getNamedParameterJdbcOperations().update(sql, args);
	}

	@Override
	public int update(String sql, SqlParameterSource args) throws DataAccessException {
		return getNamedParameterJdbcOperations().update(sql, args);
	}

	@Override
	public int update(String sql, Object ... args) throws DataAccessException {
		return (ObjectUtils.isEmpty(args) ?
				getJdbcOperations().update(sql) :
				getJdbcOperations().update(sql, getArguments(args)));
	}

	@Override
	public int[] batchUpdate(String sql, List<Object[]> batchArgs) {
		return batchUpdate(sql, batchArgs, new int[0]);
	}

	@Override
	public int[] batchUpdate(String sql, List<Object[]> batchArgs, int[] argTypes) {
		return BatchUpdateUtils.executeBatchUpdate(sql, batchArgs, argTypes, getJdbcOperations());
	}

	@Override
	public int[] batchUpdate(String sql, Map<String, ?>[] batchValues) {
		return getNamedParameterJdbcOperations().batchUpdate(sql, batchValues);
	}

	@Override
	public int[] batchUpdate(String sql, SqlParameterSource[] batchArgs) {
		return getNamedParameterJdbcOperations().batchUpdate(sql, batchArgs);
	}


	/*
	 * Considers an Object array passed into a varargs parameter as
	 * collection of arguments rather than as single argument.
	 */
	private Object[] getArguments(Object[] varArgs) {
		if (varArgs.length == 1 && varArgs[0] instanceof Object[]) {
			return (Object[]) varArgs[0];
		}
		else {
			return varArgs;
		}
	}

}