easyexcel/src/main/java/com/alibaba/excel/util/ConverterUtils.java

package com.alibaba.excel.util;

import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;

import com.alibaba.excel.converters.Converter;
import com.alibaba.excel.converters.ConverterKeyBuild;
import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.exception.ExcelDataConvertException;
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.GlobalConfiguration;
import com.alibaba.excel.metadata.property.ExcelContentProperty;
import com.alibaba.excel.read.metadata.holder.ReadHolder;

/**
 * Converting objects
 *
 * @author Jiaju Zhuang
 **/
public class ConverterUtils {

    private ConverterUtils() {}

    /**
     * Convert it into a String map
     *
     * @param cellDataMap
     * @param readHolder
     * @return
     */
    public static Map<Integer, String> convertToStringMap(Map<Integer, CellData> cellDataMap, ReadHolder readHolder) {
        Map<Integer, String> stringMap = new HashMap<Integer, String>(cellDataMap.size() * 4 / 3 + 1);
        for (Map.Entry<Integer, CellData> entry : cellDataMap.entrySet()) {
            CellData cellData = entry.getValue();
            if (cellData.getType() == CellDataTypeEnum.EMPTY) {
                stringMap.put(entry.getKey(), null);
                continue;
            }
            Converter converter =
                readHolder.converterMap().get(ConverterKeyBuild.buildKey(String.class, cellData.getType()));
            if (converter == null) {
                throw new ExcelDataConvertException(
                    "Converter not found, convert " + cellData.getType() + " to String");
            }
            try {
                stringMap.put(entry.getKey(),
                    (String)(converter.convertToJavaData(cellData, null, readHolder.globalConfiguration())));
            } catch (Exception e) {
                throw new ExcelDataConvertException("Convert data " + cellData + " to String error ", e);
            }
        }
        return stringMap;
    }

    /**
     * Convert it into a Java object
     *
     * @param cellData
     * @param field
     * @param contentProperty
     * @param converterMap
     * @param globalConfiguration
     * @return
     */
    public static Object convertToJavaObject(CellData cellData, Field field, ExcelContentProperty contentProperty,
        Map<String, Converter> converterMap, GlobalConfiguration globalConfiguration) {
        Class clazz;
        if (field == null) {
            clazz = String.class;
        } else {
            clazz = field.getType();
        }
        if (clazz == CellData.class) {
            Type type = field.getGenericType();
            Class classGeneric;
            if (type instanceof ParameterizedType) {
                ParameterizedType parameterizedType = (ParameterizedType)type;
                classGeneric = (Class)parameterizedType.getActualTypeArguments()[0];
            } else {
                classGeneric = String.class;
            }
            CellData cellDataReturn = new CellData(cellData);
            cellDataReturn.setData(
                doConvertToJavaObject(cellData, classGeneric, contentProperty, converterMap, globalConfiguration));
            return cellDataReturn;
        }
        return doConvertToJavaObject(cellData, clazz, contentProperty, converterMap, globalConfiguration);
    }

    /**
     *
     * @param cellData
     * @param clazz
     * @param contentProperty
     * @param converterMap
     * @param globalConfiguration
     * @return
     */
    private static Object doConvertToJavaObject(CellData cellData, Class clazz, ExcelContentProperty contentProperty,
        Map<String, Converter> converterMap, GlobalConfiguration globalConfiguration) {
        Converter converter = null;
        if (contentProperty != null) {
            converter = contentProperty.getConverter();
        }
        if (converter == null) {
            converter = converterMap.get(ConverterKeyBuild.buildKey(clazz, cellData.getType()));
        }
        if (converter == null) {
            throw new ExcelDataConvertException(
                "Converter not found, convert " + cellData.getType() + " to " + clazz.getName());
        }
        try {
            return converter.convertToJavaData(cellData, contentProperty, globalConfiguration);
        } catch (Exception e) {
            throw new ExcelDataConvertException("Convert data " + cellData + " to " + clazz + " error ", e);
        }
    }
}