org.springframework.util.ReflectionUtils.MethodFilter Java Examples

/**
 * Find the original method for the supplied {@link Method bridge Method}.
 * <p>It is safe to call this method passing in a non-bridge {@link Method} instance.
 * In such a case, the supplied {@link Method} instance is returned directly to the caller.
 * Callers are <strong>not</strong> required to check for bridging before calling this method.
 * @param bridgeMethod the method to introspect
 * @return the original method (either the bridged method or the passed-in method
 * if no more specific one could be found)
 */
public static Method findBridgedMethod(Method bridgeMethod) {
	if (!bridgeMethod.isBridge()) {
		return bridgeMethod;
	}
	Method bridgedMethod = cache.get(bridgeMethod);
	if (bridgedMethod == null) {
		// Gather all methods with matching name and parameter size.
		List<Method> candidateMethods = new ArrayList<>();
		MethodFilter filter = candidateMethod ->
				isBridgedCandidateFor(candidateMethod, bridgeMethod);
		ReflectionUtils.doWithMethods(bridgeMethod.getDeclaringClass(), candidateMethods::add, filter);
		if (!candidateMethods.isEmpty()) {
			bridgedMethod = candidateMethods.size() == 1 ?
					candidateMethods.get(0) :
					searchCandidates(candidateMethods, bridgeMethod);
		}
		if (bridgedMethod == null) {
			// A bridge method was passed in but we couldn't find the bridged method.
			// Let's proceed with the passed-in method and hope for the best...
			bridgedMethod = bridgeMethod;
		}
		cache.put(bridgeMethod, bridgedMethod);
	}
	return bridgedMethod;
}
 

private static Method getMethod(Class<?> controllerType, final String methodName, final Object... args) {
	MethodFilter selector = method -> {
		String name = method.getName();
		int argLength = method.getParameterCount();
		return (name.equals(methodName) && argLength == args.length);
	};
	Set<Method> methods = MethodIntrospector.selectMethods(controllerType, selector);
	if (methods.size() == 1) {
		return methods.iterator().next();
	}
	else if (methods.size() > 1) {
		throw new IllegalArgumentException(String.format(
				"Found two methods named '%s' accepting arguments %s in controller %s: [%s]",
				methodName, Arrays.asList(args), controllerType.getName(), methods));
	}
	else {
		throw new IllegalArgumentException("No method named '" + methodName + "' with " + args.length +
				" arguments found in controller " + controllerType.getName());
	}
}
 

private static Method getMethod(Class<?> controllerType, final String methodName, final Object... args) {
	MethodFilter selector = method -> {
		String name = method.getName();
		int argLength = method.getParameterCount();
		return (name.equals(methodName) && argLength == args.length);
	};
	Set<Method> methods = MethodIntrospector.selectMethods(controllerType, selector);
	if (methods.size() == 1) {
		return methods.iterator().next();
	}
	else if (methods.size() > 1) {
		throw new IllegalArgumentException(String.format(
				"Found two methods named '%s' accepting arguments %s in controller %s: [%s]",
				methodName, Arrays.asList(args), controllerType.getName(), methods));
	}
	else {
		throw new IllegalArgumentException("No method named '" + methodName + "' with " + args.length +
				" arguments found in controller " + controllerType.getName());
	}
}
 

/***不获取到Object中的method*/
public static void doWithMethods(Class<?> clazz, MethodCallback mc, MethodFilter mf) {
    // Keep backing up the inheritance hierarchy.
    Method[] methods = clazz.getDeclaredMethods();
    for (Method method : methods) {
        if (mf != null && !mf.matches(method)) {
            continue;
        }
        try {
            mc.doWith(method);
        }
        catch (IllegalAccessException ex) {
            throw new IllegalStateException("Not allowed to access method '" + method.getName() + "': " + ex);
        }
    }
    Class<?> superclass = clazz.getSuperclass();
    
    if (superclass != null && superclass!=Object.class) {
        doWithMethods(clazz.getSuperclass(), mc, mf);
    }
    else if (clazz.isInterface()) {
        for (Class<?> superIfc : clazz.getInterfaces()) {
            doWithMethods(superIfc, mc, mf);
        }
    }
}
 

private static Method getMethod(Class<?> controllerType, final String methodName, final Object... args) {
	MethodFilter selector = new MethodFilter() {
		@Override
		public boolean matches(Method method) {
			String name = method.getName();
			int argLength = method.getParameterTypes().length;
			return (name.equals(methodName) && argLength == args.length);
		}
	};
	Set<Method> methods = MethodIntrospector.selectMethods(controllerType, selector);
	if (methods.size() == 1) {
		return methods.iterator().next();
	}
	else if (methods.size() > 1) {
		throw new IllegalArgumentException(String.format(
				"Found two methods named '%s' accepting arguments %s in controller %s: [%s]",
				methodName, Arrays.asList(args), controllerType.getName(), methods));
	}
	else {
		throw new IllegalArgumentException("No method named '" + methodName + "' with " + args.length +
				" arguments found in controller " + controllerType.getName());
	}
}
 

private static Method getMethod(Class<?> controllerType, final String methodName, final Object... args) {
	MethodFilter selector = new MethodFilter() {
		@Override
		public boolean matches(Method method) {
			String name = method.getName();
			int argLength = method.getParameterTypes().length;
			return (name.equals(methodName) && argLength == args.length);
		}
	};
	Set<Method> methods = MethodIntrospector.selectMethods(controllerType, selector);
	if (methods.size() == 1) {
		return methods.iterator().next();
	}
	else if (methods.size() > 1) {
		throw new IllegalArgumentException(String.format(
				"Found two methods named '%s' accepting arguments %s in controller %s: [%s]",
				methodName, Arrays.asList(args), controllerType.getName(), methods));
	}
	else {
		throw new IllegalArgumentException("No method named '" + methodName + "' with " + args.length +
				" arguments found in controller " + controllerType.getName());
	}
}
 

/**
 * Perform the given callback operation on all matching methods of the
 * given class and superclasses.
 * <p>The same named method occurring on subclass and superclass will
 * appear twice, unless excluded by the specified {@link MethodFilter}.
 * @param targetClass class to start looking at
 * @param mc the callback to invoke for each method
 * @param mf the filter that determines the methods to apply the callback to
 */
public static void doWithMethods(Class targetClass, MethodCallback mc, MethodFilter mf)
		throws IllegalArgumentException {

	// Keep backing up the inheritance hierarchy.
	do {
		Method[] methods = targetClass.getDeclaredMethods();
		for (int i = 0; i < methods.length; i++) {
			if (mf != null && !mf.matches(methods[i])) {
				continue;
			}
			try {
				mc.doWith(methods[i]);
			}
			catch (IllegalAccessException ex) {
				throw new IllegalStateException(
						"Shouldn't be illegal to access method '" + methods[i].getName() + "': " + ex);
			}
		}
		targetClass = targetClass.getSuperclass();
	}
	while (targetClass != null);
}
 

public static Set<Method> selectMethodsByParameterTypes(Class<?> targetClass, String targetMethod, Method sourceMethod) {
	Set<Method> methods = MethodIntrospector.selectMethods(targetClass, (MethodFilter)method -> {
		return method.getName().equals(targetMethod) && 
				method.getParameterCount()==sourceMethod.getParameterCount() &&
				Objects.deepEquals(method.getParameterTypes(), sourceMethod.getParameterTypes());
	});
	return methods;
}
 

/**
 * Select handler methods for the given handler type.
 * <p>Callers define handler methods of interest through the {@link MethodFilter} parameter.
 * @param handlerType the handler type to search handler methods on
 * @param handlerMethodFilter a {@link MethodFilter} to help recognize handler methods of interest
 * @return the selected methods, or an empty set
 * @see MethodIntrospector#selectMethods
 */
public static Set<Method> selectMethods(Class<?> handlerType, MethodFilter handlerMethodFilter) {
	return MethodIntrospector.selectMethods(handlerType, handlerMethodFilter);
}
 

/**
 * Select handler methods for the given handler type.
 * <p>Callers define handler methods of interest through the {@link MethodFilter} parameter.
 * @param handlerType the handler type to search handler methods on
 * @param handlerMethodFilter a {@link MethodFilter} to help recognize handler methods of interest
 * @return the selected methods, or an empty set
 * @see MethodIntrospector#selectMethods(Class, MethodFilter)
 */
public static Set<Method> selectMethods(Class<?> handlerType, MethodFilter handlerMethodFilter) {
	return MethodIntrospector.selectMethods(handlerType, handlerMethodFilter);
}
 

/**
 * Select handler methods for the given handler type.
 * <p>Callers define handler methods of interest through the {@link MethodFilter} parameter.
 * @param handlerType the handler type to search handler methods on
 * @param handlerMethodFilter a {@link MethodFilter} to help recognize handler methods of interest
 * @return the selected methods, or an empty set
 * @see MethodIntrospector#selectMethods(Class, MethodFilter)
 */
public static Set<Method> selectMethods(Class<?> handlerType, MethodFilter handlerMethodFilter) {
	return MethodIntrospector.selectMethods(handlerType, handlerMethodFilter);
}