Java Parameter.isAnnotationPresent方法代碼示例

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
private void prepareQuery(JdbcQueryMethod method) {
    try {
        Method m = (Method) originalMethod.get(method);
        if (!m.isAnnotationPresent(Query.class)) {
            throw new IllegalStateException("Query annotation not present");
        }
        this.query = m.getAnnotation(Query.class).value();

        parameterKeys = new ArrayList<>(m.getParameterCount());
        for (Parameter parameter : m.getParameters()) {
            if (parameter.isAnnotationPresent(Param.class)) {
                parameterKeys.add(parameter.getAnnotation(Param.class).value());
            } else {
                parameterKeys.add(null);
            }
        }
    } catch (IllegalArgumentException | IllegalAccessException e) {
        throw new RuntimeException(e);
    }
}
 

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
@Override
public boolean support(Parameter param) {
	Class<?> vClazz = param.getType();
	if (vClazz.isPrimitive() || vClazz == String.class || vClazz == Date.class) {
		return param.isAnnotationPresent(Key.class);
	}
	return false;
}
 

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
/**
 * Find all handler mehtods of the resource.
 *
 * @param resourceInstance The instance.
 */
private void findResourceMethods(Object resourceInstance) {
	for (Method declaredMethod : resourceInstance.getClass().getDeclaredMethods()) {
		Path methodPath = declaredMethod.getAnnotation(Path.class);
		
		if (methodPath == null) {
			continue;
		}
		
		Consumes consumes = declaredMethod.getAnnotation(Consumes.class);
		Produces produces = declaredMethod.getAnnotation(Produces.class);
		
		HTTPMethod method = HTTPMethod.GET;
		
		if (declaredMethod.isAnnotationPresent(POST.class)) {
			method = HTTPMethod.POST;
		} else if (declaredMethod.isAnnotationPresent(DELETE.class)) {
			method = HTTPMethod.DELETE;
		} else if (declaredMethod.isAnnotationPresent(PUT.class)) {
			method = HTTPMethod.PUT;
		} else if (declaredMethod.isAnnotationPresent(PATCH.class)) {
			method = HTTPMethod.PATCH;
		}
		
		ResourceMethod resourceMethod = new ResourceMethod(methodPath.value(), method,
			consumes.value(), produces.value(), declaredMethod, resourceInstance);
		
		for (Parameter parameter : declaredMethod.getParameters()) {
			if (parameter.isAnnotationPresent(PostKey.class)) {
				resourceMethod.addPostParam(parameter.getAnnotation(PostKey.class).value());
			}
		}
		
		this.resourceMethods.put(methodPath.value(), resourceMethod);
	}
}
 

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
@Override
public boolean supports(Parameter parameter) {
  return parameter.isAnnotationPresent(Mock.class);
}
 

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
@Override
public boolean support(Parameter param) {
	return param.isAnnotationPresent(Mapper.class);
}
 

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
@Override
public Object[] injectParameters() throws Throwable {
	Object[] args = new Object[methodWrapper.getParamterLength()];

	for (int i = 1; i < args.length; i++) {
		// 當前方法參數的名稱
		String paramName = methodWrapper.getParameterName(i);
		// 在請求參數中尋找和當前方法形參名相同的對應的參數值
		String[] param = paramMap.get(paramName);
		// 當前方法的參數對象
		Parameter parameter = methodWrapper.getParameter(i);
		// 當前方法參數的類型
		Class<?> paramType = parameter.getType();
		
		if (paramType == Transfer.class) {
			// 操作request 和 session的類
			args[i] = new Transfer(wrapper);
		} 
		else if (paramType == Share.class) {
			// 文件下載類
			args[i] = new Share(wrapper);
		} 
		else if (paramType == Multipart.class) {
			// 文件上傳的類
			args[i] = multipartCheck(contextParameter.getMultipart());
		} 
		else if (parameter.isAnnotationPresent(UrlHolder.class)) {
			// 獲取到方法參數內的@UrlHolder注解對象
			UrlHolder urlVar = parameter.getAnnotation(UrlHolder.class);
			// 在map中獲取@UrlHolder value()方法中字符串對應的值
			String string = contextParameter.getPlaceHolder(paramName);
			if (string == null) {
				string = contextParameter.getPlaceHolder(urlVar.value());
			}
			args[i] = BasicUtil.convert(paramType, string);
		} 
		else if (BasicUtil.isCollection(paramType)) { // 當參數為集合時
			// 當集合的泛型是primitive時 如 int long 這裏也把String當做原生類型
			if (BasicUtil.isCommonCollection(parameter.getParameterizedType())) {
				args[i] = BasicUtil.convertList(paramType, param);
			}
			// 當集合的泛型為 除上麵之外的其他java對象時
			else {
				existDateFormatAnnotation(parameter);
				args[i] = resultList(parameter.getParameterizedType());
				cycleControl();
			}
		} 
		else if (BasicUtil.isCommonType(paramType)) { // 當參數為基本類型時
			// param數組為空時結束此次循環
			if (BasicUtil.notNullAndLenNotZero(param)) 
				continue;
			args[i] = BasicUtil.convert(paramType, param[0]);
		} 
		else if (paramType == Date.class) { // 當參數為時間類型時
			// param數組為空時結束此次循環
			if (BasicUtil.notNullAndLenNotZero(param)) 
				continue;
			existDateFormatAnnotation(parameter);
			dateFormatCheck(format);
			args[i] = DateUtil.resolve(param[0], format);
		} 
		else { // 這裏一般表示用戶自定義的java對象
			existDateFormatAnnotation(parameter);
			args[i] = resultSingle(paramType, 0);
			cycleControl();
		}
	}
	return args;
}
 

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
private static boolean isOptional(Parameter p) {
    return p.isAnnotationPresent(Optional.class);
}
 

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
private static boolean isSender(Parameter p) {
    return p.isAnnotationPresent(Sender.class) && subclassOf(CommandSender.class, p);
}
 

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
private static boolean isCommand(Parameter p) {
    return p.isAnnotationPresent(Command.class) && subclassOf(org.bukkit.command.Command.class, p);
}
 

import java.lang.reflect.Parameter; //導入方法依賴的package包/類
private ModelMBeanOperationInfo[] generateOperationsInfos(Class sClass)
{
    ArrayList<ModelMBeanOperationInfo> operations = new ArrayList<>();
    for (Method method : sClass.getMethods())
    {
        if (!method.isAnnotationPresent(RemoteMethod.class))
        {
            continue;
        }

        RemoteMethod remoteMethod = method.getAnnotation(RemoteMethod.class);

        MBeanParameterInfo[] parameterInfos = null;
        if (method.getParameters().length > 0)
        {
            parameterInfos = new MBeanParameterInfo[method.getParameters().length];
            int i = 0;
            for (Parameter parameter : method.getParameters())
            {
                String name = parameter.getName();
                String description = parameter.getName();
                if (parameter.isAnnotationPresent(RemoteParameter.class))
                {
                    RemoteParameter remoteParameter = parameter.getAnnotation(RemoteParameter.class);
                    name = remoteParameter.name();
                    description = remoteParameter.description();
                }

                parameterInfos[i++] = new MBeanParameterInfo(name, parameter.getType().getName(), description);
            }
        }
        ModelMBeanOperationInfo operation = new ModelMBeanOperationInfo(
                method.getName(),
                remoteMethod.description(),
                parameterInfos,
                method.getReturnType().getSimpleName(),
                remoteMethod.impact());

        operations.add(operation);
    }

    if (operations.size() > 0)
    {
        return operations.toArray(new ModelMBeanOperationInfo[operations.size()]);
    }else {
        //No attribute so return null is better
        return null;
    }
}