/*
 * Copyright 2002-2013 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.support.lob;

import java.io.InputStream;
import java.io.Reader;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.lang.Nullable;

/**
 * Abstract base class for {@link LobHandler} implementations.
 *
 * <p>Implements all accessor methods for column names through a column lookup
 * and delegating to the corresponding accessor that takes a column index.
 *
 * @author Juergen Hoeller
 * @since 1.2
 * @see java.sql.ResultSet#findColumn
 */
public abstract class AbstractLobHandler implements LobHandler {

	@Override
	@Nullable
	public byte[] getBlobAsBytes(ResultSet rs, String columnName) throws SQLException {
		return getBlobAsBytes(rs, rs.findColumn(columnName));
	}

	@Override
	@Nullable
	public InputStream getBlobAsBinaryStream(ResultSet rs, String columnName) throws SQLException {
		return getBlobAsBinaryStream(rs, rs.findColumn(columnName));
	}

	@Override
	@Nullable
	public String getClobAsString(ResultSet rs, String columnName) throws SQLException {
		return getClobAsString(rs, rs.findColumn(columnName));
	}

	@Override
	@Nullable
	public InputStream getClobAsAsciiStream(ResultSet rs, String columnName) throws SQLException {
		return getClobAsAsciiStream(rs, rs.findColumn(columnName));
	}

	@Override
	public Reader getClobAsCharacterStream(ResultSet rs, String columnName) throws SQLException {
		return getClobAsCharacterStream(rs, rs.findColumn(columnName));
	}

}
