org.easybatch.extensions.msexcel.MsExcelRecordMapper.java Source code

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Here is the source code for org.easybatch.extensions.msexcel.MsExcelRecordMapper.java

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/**
 * The MIT License
 *
 *   Copyright (c) 2017, Mahmoud Ben Hassine (mahmoud.benhassine@icloud.com)
 *
 *   Permission is hereby granted, free of charge, to any person obtaining a copy
 *   of this software and associated documentation files (the "Software"), to deal
 *   in the Software without restriction, including without limitation the rights
 *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *   copies of the Software, and to permit persons to whom the Software is
 *   furnished to do so, subject to the following conditions:
 *
 *   The above copyright notice and this permission notice shall be included in
 *   all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *   THE SOFTWARE.
 */
package org.easybatch.extensions.msexcel;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.easybatch.core.mapper.ObjectMapper;
import org.easybatch.core.mapper.RecordMapper;
import org.easybatch.core.record.GenericRecord;
import org.easybatch.core.record.Record;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * Mapper that unmarshal MS Excel records to Java objects.
 *
 * @author Mahmoud Ben Hassine (mahmoud.benhassine@icloud.com)
 */
public class MsExcelRecordMapper<P> implements RecordMapper<MsExcelRecord, Record<P>> {

    private String[] fields;

    private ObjectMapper<P> objectMapper;

    /**
     * Create a new {@link MsExcelRecordMapper}.
     *
     * @param type the target object type
     * @param fields the fields to unmarshal
     */
    public MsExcelRecordMapper(final Class<P> type, final String... fields) {
        this.fields = fields;
        objectMapper = new ObjectMapper<>(type);
    }

    public Record<P> processRecord(MsExcelRecord msExcelRecord) throws Exception {
        P unmarshalledObject = objectMapper.mapObject(toMap(msExcelRecord.getPayload()));
        return new GenericRecord<>(msExcelRecord.getHeader(), unmarshalledObject);
    }

    private Map<String, String> toMap(final Row row) {
        Map<String, String> map = new HashMap<>();
        Iterator<Cell> cellIterator = row.cellIterator();
        int i = 0;
        while (cellIterator.hasNext()) {
            Cell cell = cellIterator.next();
            map.put(fields[i++], getCellValue(cell));
        }
        return map;
    }

    private String getCellValue(Cell cell) {
        switch (cell.getCellType()) {
        case Cell.CELL_TYPE_BOOLEAN:
            return String.valueOf(cell.getBooleanCellValue());
        case Cell.CELL_TYPE_NUMERIC:
            return String.valueOf(cell.getNumericCellValue());
        case Cell.CELL_TYPE_STRING:
            return cell.getStringCellValue();
        }
        return "";
    }
}