easyexcel/src/main/java/com/alibaba/excel/write/executor/ExcelWriteAddExecutor.java

package com.alibaba.excel.write.executor;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

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

import com.alibaba.excel.context.WriteContext;
import com.alibaba.excel.enums.HeadKindEnum;
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.property.ExcelContentProperty;
import com.alibaba.excel.util.ClassUtils;
import com.alibaba.excel.util.CollectionUtils;
import com.alibaba.excel.util.WorkBookUtil;
import com.alibaba.excel.util.WriteHandlerUtils;
import com.alibaba.excel.write.metadata.holder.WriteHolder;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;

import net.sf.cglib.beans.BeanMap;

/**
 * Add the data into excel
 *
 * @author Jiaju Zhuang
 */
public class ExcelWriteAddExecutor extends AbstractExcelWriteExecutor {

    public ExcelWriteAddExecutor(WriteContext writeContext) {
        super(writeContext);
    }

    public void add(List data) {
        if (CollectionUtils.isEmpty(data)) {
            data = new ArrayList();
        }
        WriteSheetHolder writeSheetHolder = writeContext.writeSheetHolder();
        int newRowIndex = writeSheetHolder.getNewRowIndexAndStartDoWrite();
        if (writeSheetHolder.isNew() && !writeSheetHolder.getExcelWriteHeadProperty().hasHead()) {
            newRowIndex += writeContext.currentWriteHolder().relativeHeadRowIndex();
        }
        // BeanMap is out of order,so use fieldList
        List<Field> fieldList = new ArrayList<Field>();
        int relativeRowIndex=0;
        for(Object oneRowData : data){
            int n = relativeRowIndex + newRowIndex;
            addOneRowOfDataToExcel(oneRowData, n, relativeRowIndex, fieldList);
            relativeRowIndex++;
        }
    }

    private void addOneRowOfDataToExcel(Object oneRowData, int n, int relativeRowIndex, List<Field> fieldList) {
        if (oneRowData == null) {
            return;
        }
        WriteHandlerUtils.beforeRowCreate(writeContext, n, relativeRowIndex, Boolean.FALSE);
        Row row = WorkBookUtil.createRow(writeContext.writeSheetHolder().getSheet(), n);
        WriteHandlerUtils.afterRowCreate(writeContext, row, relativeRowIndex, Boolean.FALSE);
        if (oneRowData instanceof List) {
            addBasicTypeToExcel((List)oneRowData, row, relativeRowIndex);
        } else {
            addJavaObjectToExcel(oneRowData, row, relativeRowIndex, fieldList);
        }
        WriteHandlerUtils.afterRowDispose(writeContext, row, relativeRowIndex, Boolean.FALSE);
    }

    private void addBasicTypeToExcel(List<Object> oneRowData, Row row, int relativeRowIndex) {
        if (CollectionUtils.isEmpty(oneRowData)) {
            return;
        }
        Map<Integer, Head> headMap = writeContext.currentWriteHolder().excelWriteHeadProperty().getHeadMap();
        int dataIndex = 0;
        int cellIndex = 0;
        for (Map.Entry<Integer, Head> entry : headMap.entrySet()) {
            if (dataIndex >= oneRowData.size()) {
                return;
            }
            cellIndex = entry.getKey();
            Head head = entry.getValue();
            doAddBasicTypeToExcel(oneRowData, head, row, relativeRowIndex, dataIndex++, cellIndex);
        }
        // Finish
        if (dataIndex >= oneRowData.size()) {
            return;
        }
        if (cellIndex != 0) {
            cellIndex++;
        }
        int size = oneRowData.size() - dataIndex;
        for (int i = 0; i < size; i++) {
            doAddBasicTypeToExcel(oneRowData, null, row, relativeRowIndex, dataIndex++, cellIndex++);
        }
    }

    private void doAddBasicTypeToExcel(List<Object> oneRowData, Head head, Row row, int relativeRowIndex, int dataIndex,
        int cellIndex) {
        if (writeContext.currentWriteHolder().ignore(null, cellIndex)) {
            return;
        }
        WriteHandlerUtils.beforeCellCreate(writeContext, row, head, cellIndex, relativeRowIndex, Boolean.FALSE);
        Cell cell = WorkBookUtil.createCell(row, cellIndex);
        WriteHandlerUtils.afterCellCreate(writeContext, cell, head, relativeRowIndex, Boolean.FALSE);
        Object value = oneRowData.get(dataIndex);
        CellData cellData = converterAndSet(writeContext.currentWriteHolder(), value == null ? null : value.getClass(),
            cell, value, null, head, relativeRowIndex);
        WriteHandlerUtils.afterCellDispose(writeContext, cellData, cell, head, relativeRowIndex, Boolean.FALSE);
    }

    private void addJavaObjectToExcel(Object oneRowData, Row row, int relativeRowIndex, List<Field> fieldList) {
        WriteHolder currentWriteHolder = writeContext.currentWriteHolder();
        BeanMap beanMap = BeanMap.create(oneRowData);
        Set<String> beanMapHandledSet = new HashSet<String>();
        int cellIndex = 0;
        // If it's a class it needs to be cast by type
        if (HeadKindEnum.CLASS.equals(writeContext.currentWriteHolder().excelWriteHeadProperty().getHeadKind())) {
            Map<Integer, Head> headMap = writeContext.currentWriteHolder().excelWriteHeadProperty().getHeadMap();
            Map<Integer, ExcelContentProperty> contentPropertyMap =
                writeContext.currentWriteHolder().excelWriteHeadProperty().getContentPropertyMap();
            for (Map.Entry<Integer, ExcelContentProperty> entry : contentPropertyMap.entrySet()) {
                cellIndex = entry.getKey();
                ExcelContentProperty excelContentProperty = entry.getValue();
                String name = excelContentProperty.getField().getName();
                if (writeContext.currentWriteHolder().ignore(name, cellIndex)) {
                    continue;
                }
                if (!beanMap.containsKey(name)) {
                    continue;
                }
                Head head = headMap.get(cellIndex);
                WriteHandlerUtils.beforeCellCreate(writeContext, row, head, cellIndex, relativeRowIndex, Boolean.FALSE);
                Cell cell = WorkBookUtil.createCell(row, cellIndex);
                WriteHandlerUtils.afterCellCreate(writeContext, cell, head, relativeRowIndex, Boolean.FALSE);
                Object value = beanMap.get(name);
                CellData cellData = converterAndSet(currentWriteHolder, excelContentProperty.getField().getType(), cell,
                    value, excelContentProperty, head, relativeRowIndex);
                WriteHandlerUtils.afterCellDispose(writeContext, cellData, cell, head, relativeRowIndex, Boolean.FALSE);
                beanMapHandledSet.add(name);
            }
        }
        // Finish
        if (beanMapHandledSet.size() == beanMap.size()) {
            return;
        }
        if (cellIndex != 0) {
            cellIndex++;
        }
        Map<String, Field> ignoreMap = writeContext.currentWriteHolder().excelWriteHeadProperty().getIgnoreMap();
        initFieldList(oneRowData.getClass(), fieldList);
        for (Field field : fieldList) {
            String filedName = field.getName();
            boolean uselessData = !beanMap.containsKey(filedName) || beanMapHandledSet.contains(filedName)
                || ignoreMap.containsKey(filedName) || writeContext.currentWriteHolder().ignore(filedName, cellIndex);
            if (uselessData) {
                cellIndex++;
                continue;
            }
            Object value = beanMap.get(filedName);
            WriteHandlerUtils.beforeCellCreate(writeContext, row, null, cellIndex, relativeRowIndex, Boolean.FALSE);
            Cell cell = WorkBookUtil.createCell(row, cellIndex++);
            WriteHandlerUtils.afterCellCreate(writeContext, cell, null, relativeRowIndex, Boolean.FALSE);
            CellData cellData = converterAndSet(currentWriteHolder, value == null ? null : value.getClass(), cell,
                value, null, null, relativeRowIndex);
            WriteHandlerUtils.afterCellDispose(writeContext, cellData, cell, null, relativeRowIndex, Boolean.FALSE);
        }
    }

    private void initFieldList(Class clazz, List<Field> fieldList) {
        if (!fieldList.isEmpty()) {
            return;
        }
        ClassUtils.declaredFields(clazz, fieldList,
            writeContext.writeWorkbookHolder().getWriteWorkbook().getConvertAllFiled());
    }

}