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package top.javatool.canal.client.util;


import top.javatool.canal.client.handler.EntryHandler;

import javax.persistence.Table;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author yang peng
 * @date 2019/3/2910:45
 */

public class GenericUtil {


    private static Map, Class> cache = new ConcurrentHashMap<>();


    static String getTableGenericProperties(EntryHandler entryHandler) {
        Class tableClass = getTableClass(entryHandler);
        if (tableClass != null) {
            Table annotation = tableClass.getAnnotation(Table.class);
            if (annotation != null) {
                return annotation.name();
            }
        }
        return null;
    }


    @SuppressWarnings("unchecked")
    public static  Class getTableClass(EntryHandler object) {
        Class handlerClass = object.getClass();
        Class tableClass = cache.get(handlerClass);
        if (tableClass == null) {
            Type[] interfacesTypes = handlerClass.getGenericInterfaces();
            for (Type t : interfacesTypes) {
                Class c = (Class) ((ParameterizedType) t).getRawType();
                if (c.equals(EntryHandler.class)) {
                    tableClass = (Class) ((ParameterizedType) t).getActualTypeArguments()[0];
                    cache.putIfAbsent(handlerClass, tableClass);
                    return tableClass;
                }
            }
        }
        return tableClass;
    }


}