/*
 * Copyright 2002-2005 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.orm.ibatis.support;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.jdbc.support.lob.LobCreator;
import org.springframework.jdbc.support.lob.LobHandler;

/**
 * iBATIS TypeHandler implementation for Strings that get mapped to CLOBs.
 * Retrieves the LobHandler to use from SqlMapClientFactoryBean at config time.
 *
 * <p>Particularly useful for storing Strings with more than 4000 characters in an
 * Oracle database (only possible via CLOBs), in combination with OracleLobHandler.
 *
 * <p>Can also be defined in generic iBATIS mappings, as DefaultLobCreator will
 * work with most JDBC-compliant database drivers. In this case, the field type
 * does not have to be BLOB: For databases like MySQL and MS SQL Server, any
 * large enough binary type will work.
 *
 * @author Juergen Hoeller
 * @since 1.1.5
 * @see org.springframework.orm.ibatis.SqlMapClientFactoryBean#setLobHandler
 */
public class ClobStringTypeHandler extends AbstractLobTypeHandler {

	/**
	 * Constructor used by iBATIS: fetches config-time LobHandler from
	 * SqlMapClientFactoryBean.
	 * @see org.springframework.orm.ibatis.SqlMapClientFactoryBean#getConfigTimeLobHandler
	 */
	public ClobStringTypeHandler() {
		super();
	}

	/**
	 * Constructor used for testing: takes an explicit LobHandler.
	 */
	protected ClobStringTypeHandler(LobHandler lobHandler) {
		super(lobHandler);
	}

	@Override
	protected void setParameterInternal(
			PreparedStatement ps, int index, Object value, String jdbcType, LobCreator lobCreator)
			throws SQLException {
		lobCreator.setClobAsString(ps, index, (String) value);
	}

	@Override
	protected Object getResultInternal(ResultSet rs, int index, LobHandler lobHandler)
			throws SQLException {
		return lobHandler.getClobAsString(rs, index);
	}

	public Object valueOf(String s) {
		return s;
	}

}
