001/*
002 *  Copyright 2018 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.plugins.contentio.synchronize.impl.typehandler;
017
018import java.io.IOException;
019import java.sql.CallableStatement;
020import java.sql.Clob;
021import java.sql.PreparedStatement;
022import java.sql.ResultSet;
023import java.sql.SQLException;
024
025import org.apache.commons.io.IOUtils;
026import org.apache.ibatis.type.BaseTypeHandler;
027import org.apache.ibatis.type.JdbcType;
028import org.slf4j.Logger;
029import org.slf4j.LoggerFactory;
030
031import com.google.common.base.CharMatcher;
032
033/**
034 * Handle Clob SQL type to return string value
035 */
036public class SQLClobTypeHandler extends BaseTypeHandler<Object>
037{
038    private static Logger __logger = LoggerFactory.getLogger(SQLClobTypeHandler.class);
039    
040    @Override
041    public void setNonNullParameter(PreparedStatement ps, int i, Object parameter, JdbcType jdbcType) throws SQLException
042    {
043        ps.setObject(i, parameter);
044    }
045
046    @Override
047    public Object getNullableResult(ResultSet rs, String columnName) throws SQLException
048    {
049        Clob clob = rs.getClob(columnName);
050        return _transformClobToString(clob);
051    }
052
053    @Override
054    public Object getNullableResult(ResultSet rs, int columnIndex) throws SQLException
055    {
056        Clob clob = rs.getClob(columnIndex);
057        return _transformClobToString(clob);
058        
059    }
060
061    @Override
062    public Object getNullableResult(CallableStatement cs, int columnIndex) throws SQLException
063    {
064        Clob clob = cs.getClob(columnIndex);
065        return _transformClobToString(clob);
066    }
067    
068    /**
069     * Transform CLOB value to String value.
070     * @param clob the clob
071     * @return the CLOB transformed to String.
072     * @throws SQLException if an error occurred
073     */
074    protected String _transformClobToString(Clob clob) throws SQLException
075    {
076        try
077        {
078            String strValue = IOUtils.toString(clob.getCharacterStream());
079            return CharMatcher.javaIsoControl().and(CharMatcher.anyOf("\r\n\t").negate()).removeFrom(strValue);
080        }
081        catch (IOException e)
082        {
083            __logger.warn("Can't transform clob to string", e);
084            return null;
085        }
086        finally
087        {
088            clob.free();
089        }
090    }
091}