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ReflectUtil.java
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executable file
·132 lines (120 loc) · 5.18 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// 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.cloud.utils;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import com.cloud.utils.exception.CloudRuntimeException;
import org.reflections.Reflections;
public class ReflectUtil {
public static Pair<Class<?>, Field> getAnyField(Class<?> clazz, String fieldName) {
try {
return new Pair<Class<?>, Field>(clazz, clazz.getDeclaredField(fieldName));
} catch (SecurityException e) {
throw new CloudRuntimeException("How the heck?", e);
} catch (NoSuchFieldException e) {
// Do I really want this? No I don't but what can I do? It only throws the NoSuchFieldException.
Class<?> parent = clazz.getSuperclass();
if (parent != null) {
return getAnyField(parent, fieldName);
}
return null;
}
}
public static Method findMethod(Class<?> clazz, String methodName) {
do {
Method[] methods = clazz.getDeclaredMethods();
for (Method method : methods) {
if (methodName.equals(method.getName())) {
return method;
}
}
clazz = clazz.getSuperclass();
} while (clazz != null);
return null;
}
// Gets all classes with some annotation from a package
public static Set<Class<?>> getClassesWithAnnotation(Class<? extends Annotation> annotation,
String[] packageNames) {
Reflections reflections;
Set<Class<?>> classes = new HashSet<Class<?>>();
for(String packageName: packageNames) {
reflections = new Reflections(packageName);
classes.addAll(reflections.getTypesAnnotatedWith(annotation));
}
return classes;
}
// Checks against posted search classes if cmd is async
public static boolean isCmdClassAsync(Class<?> cmdClass,
Class<?>[] searchClasses) {
boolean isAsync = false;
Class<?> superClass = cmdClass;
while (superClass != null && superClass != Object.class) {
String superName = superClass.getName();
for (Class<?> baseClass: searchClasses) {
if (superName.equals(baseClass.getName())) {
isAsync = true;
break;
}
}
if (isAsync)
break;
superClass = superClass.getSuperclass();
}
return isAsync;
}
// Returns all fields until a base class for a cmd class
public static List<Field> getAllFieldsForClass(Class<?> cmdClass,
Class<?> baseClass) {
List<Field> fields = new ArrayList<Field>();
Collections.addAll(fields, cmdClass.getDeclaredFields());
Class<?> superClass = cmdClass.getSuperclass();
while (baseClass.isAssignableFrom(superClass)) {
Field[] superClassFields = superClass.getDeclaredFields();
if (superClassFields != null)
Collections.addAll(fields, superClassFields);
superClass = superClass.getSuperclass();
}
return fields;
}
// Returns all unique fields except excludeClasses for a cmd class
public static Set<Field> getAllFieldsForClass(Class<?> cmdClass,
Class<?>[] excludeClasses) {
Set<Field> fields = new HashSet<Field>();
Collections.addAll(fields, cmdClass.getDeclaredFields());
Class<?> superClass = cmdClass.getSuperclass();
while (superClass != null && superClass != Object.class) {
String superName = superClass.getName();
boolean isNameEqualToSuperName = false;
for (Class<?> baseClass: excludeClasses)
if (superName.equals(baseClass.getName()))
isNameEqualToSuperName = true;
if (!isNameEqualToSuperName) {
Field[] superClassFields = superClass.getDeclaredFields();
if (superClassFields != null)
Collections.addAll(fields, superClassFields);
}
superClass = superClass.getSuperclass();
}
return fields;
}
}