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Small library for Excel generation based on XLS templates
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package org.jxls.command;

import org.jxls.area.Area;
import org.jxls.common.CellData;
import org.jxls.common.CellRef;
import org.jxls.common.Context;
import org.jxls.common.Size;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * Allows to update a cell data dynamically for any cell
 */
public class UpdateCellCommand extends AbstractCommand {
    public static final String COMMAND_NAME = "updateCell";
    private static Logger logger = LogManager.getLogger(UpdateCellCommand.class);

    private Area area;
    private String updater;
    private CellDataUpdater cellDataUpdater;

    @Override
    public String getName() {
        return COMMAND_NAME;
    }

    public String getUpdater() {
        return updater;
    }

    public void setUpdater(String updater) {
        this.updater = updater;
    }

    public CellDataUpdater getCellDataUpdater() {
        return cellDataUpdater;
    }

    public void setCellDataUpdater(CellDataUpdater cellDataUpdater) {
        this.cellDataUpdater = cellDataUpdater;
    }

    @Override
    public Command addArea(Area area) {
        String message = "You can only add a single cell area to '" + COMMAND_NAME + "' command!";
        if (areaList.size() >= 1) {
            throw new IllegalArgumentException(message);
        }
        if (area != null && area.getSize().getHeight() != 1 && area.getSize().getWidth() != 1) {
            throw new IllegalArgumentException(message);
        }
        this.area = area;
        return super.addArea(area);
    }

    @Override
    public Size applyAt(CellRef cellRef, Context context) {
        CellDataUpdater cellDataUpdater = createCellDataUpdater(context);
        if (cellDataUpdater != null) {
            CellRef srcCell = area.getStartCellRef();
            CellData cellData = area.getTransformer().getCellData(srcCell);
            cellDataUpdater.updateCellData(cellData, cellRef, context);
        }
        return area.applyAt(cellRef, context);
    }

    private CellDataUpdater createCellDataUpdater(Context context) {
        if (updater == null) {
            logger.warn("Attribute 'updater' is not set!");
            return null;
        }
        Object updaterInstance = context.getVar(updater);
        if (updaterInstance instanceof CellDataUpdater) {
            return (CellDataUpdater) updaterInstance;
        } else {
            logger.warn("CellDataUpdater is null or does not implement CellDataUpdater! Attribute 'updater': {}", updater);
            return null;
        }
    }
}