package com.vci.common.annotaion;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class CustomAnnotaionHelper{
	/**
	 * 返回对象 toString() 方法的输出内容
	 * @param obj 对象
	 * @param sb 包含内容的StringBuffer对象，该对象将作为引用参数传入
	 */
	public void getToString(Object obj, StringBuffer sb){
		if(obj == null) {
			return;
		}
		Class<?> objClazz = obj.getClass();
		Field[] fields = objClazz.getDeclaredFields();
		CustomAnnotaion caClazz = objClazz.getAnnotation(CustomAnnotaion.class);
		String objName = obj.getClass().getSimpleName();
		if(caClazz != null){
			objName = caClazz.CustomDescription();
		}
		StringBuffer sbFields = new StringBuffer();
		for(Field f : fields){
			if(f.getName().equals("serialVersionUID")){
				continue;
			}
			String fieldName = getCustomeDescription(objClazz, f.getName());
			Object fieldValue = getFieldValue(objClazz, obj, f.getName());
			if(f.isAnnotationPresent(CustomAnnotaion.class)){
				CustomAnnotaion caField = f.getAnnotation(CustomAnnotaion.class);
				if(caField.InToString()){
					sbFields.append(String.format("%s=%s,", fieldName, fieldValue));
				}
			}
		}
		if(sbFields.length() != 0){
			sbFields.replace(sbFields.length() - 1, sbFields.length(), "");
		}
		sb.append(String.format("%s [%s]", objName, sbFields.toString()));
	}
	public String getCustomeDescription(Class<?> objClazz, String fieldName){
		String res = fieldName;
		Field f;
		try {
			f = objClazz.getDeclaredField(fieldName);
			if(f != null){
				CustomAnnotaion an = f.getAnnotation(CustomAnnotaion.class);
				if(an != null){
					res = an.CustomDescription();
				}
			}
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (NoSuchFieldException e) {
			e.printStackTrace();
		}
		return res;
	}
	private Object getFieldValue(Class<?> objClazz, Object obj, String fieldName){
		Object res = "";
		String method = getMethodName(fieldName);
		try {
			Method m = objClazz.getMethod(method);
			if(m != null){
				res = m.invoke(obj);
			}
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		}
		return res;
	}
	private String getMethodName(String fieldName){
		return "get" + String.valueOf(fieldName.charAt(0)).toUpperCase() + fieldName.substring(1);
	}
}