com.netflix.servo.util.Reflection Maven / Gradle / Ivy
/**
* Copyright 2018 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.netflix.servo.util;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
/**
* Utility methods for dealing with reflection.
*/
public final class Reflection {
private Reflection() {
}
/**
* Gets all fields from class and its super classes.
*
* @param classs class to get fields from
* @return set of fields
*/
public static Set getAllFields(Class classs) {
Set set = new HashSet<>();
Class c = classs;
while (c != null) {
set.addAll(Arrays.asList(c.getDeclaredFields()));
c = c.getSuperclass();
}
return set;
}
/**
* Gets all methods from class and its super classes.
*
* @param classs class to get methods from
* @return set of methods
*/
public static Set getAllMethods(Class classs) {
Set set = new HashSet<>();
Class c = classs;
while (c != null) {
set.addAll(Arrays.asList(c.getDeclaredMethods()));
c = c.getSuperclass();
}
return set;
}
/**
* Gets all fields annotated by annotation.
*
* @param classs class to get fields from
* @param ann annotation that must be present on the field
* @return set of fields
*/
public static Set getFieldsAnnotatedBy(Class classs, Class ann) {
Set set = new HashSet<>();
for (Field field : getAllFields(classs)) {
if (field.isAnnotationPresent(ann)) {
set.add(field);
}
}
return set;
}
/**
* Gets all methods annotated by annotation.
*
* @param classs class to get fields from
* @param ann annotation that must be present on the method
* @return set of methods
*/
public static Set getMethodsAnnotatedBy(
Class classs, Class ann) {
Set set = new HashSet<>();
for (Method method : getAllMethods(classs)) {
if (method.isAnnotationPresent(ann)) {
set.add(method);
}
}
return set;
}
}