/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The ASF licenses this file to you 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.apache.storm.jdbc.mapper;

import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang3.Validate;
import org.apache.storm.jdbc.common.Column;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.ITuple;
import org.apache.storm.tuple.Values;

public class SimpleJdbcLookupMapper extends SimpleJdbcMapper implements JdbcLookupMapper {

    private Fields outputFields;

    public SimpleJdbcLookupMapper(Fields outputFields, List<Column> queryColumns) {
        super(queryColumns);

        Validate.notEmpty(outputFields.toList());
        this.outputFields = outputFields;
    }

    @Override
    public List<Values> toTuple(ITuple input, List<Column> columns) {
        Values values = new Values();

        for (String field : outputFields) {
            if (input.contains(field)) {
                values.add(input.getValueByField(field));
            } else {
                for (Column column : columns) {
                    if (column.getColumnName().equalsIgnoreCase(field)) {
                        values.add(column.getVal());
                    }
                }
            }
        }
        List<Values> result = new ArrayList<Values>();
        result.add(values);
        return result;
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(outputFields);
    }
}
