easyexcel/src/main/java/com/alibaba/excel/write/handler/CellWriteHandler.java

package com.alibaba.excel.write.handler;

import java.util.List;

import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;

/**
 * intercepts handle cell creation
 *
 * @author Jiaju Zhuang
 */
public interface CellWriteHandler extends WriteHandler {

    /**
     * Called before create the cell
     *
     * @param writeSheetHolder
     * @param writeTableHolder Nullable.It is null without using table writes.
     * @param row
     * @param head             Nullable.It is null in the case of fill data and without head.
     * @param columnIndex
     * @param relativeRowIndex Nullable.It is null in the case of fill data.
     * @param isHead           It will always be false when fill data.
     */
    default void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row,
        Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {}

    /**
     * Called after the cell is created
     *
     * @param writeSheetHolder
     * @param writeTableHolder Nullable.It is null without using table writes.
     * @param cell
     * @param head             Nullable.It is null in the case of fill data and without head.
     * @param relativeRowIndex Nullable.It is null in the case of fill data.
     * @param isHead           It will always be false when fill data.
     */
    default void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell,
        Head head, Integer relativeRowIndex, Boolean isHead) {}

    /**
     * Called after the cell data is converted
     *
     * @param writeSheetHolder
     * @param writeTableHolder Nullable.It is null without using table writes.
     * @param cell
     * @param head             Nullable.It is null in the case of fill data and without head.
     * @param cellData         Nullable.It is null in the case of add header.
     * @param relativeRowIndex Nullable.It is null in the case of fill data.
     * @param isHead           It will always be false when fill data.
     */
    default void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder,
        CellData cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {}

    /**
     * Called after all operations on the cell have been completed
     *
     * @param writeSheetHolder
     * @param writeTableHolder Nullable.It is null without using table writes.
     * @param cell
     * @param head             Nullable.It is null in the case of fill data and without head.
     * @param cellDataList     Nullable.It is null in the case of add header.There may be several when fill the data.
     * @param relativeRowIndex Nullable.It is null in the case of fill data.
     * @param isHead           It will always be false when fill data.
     */
    default void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder,
        List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {}
}