//
// 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
// 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.cloud.utils;
import static java.beans.Introspector.getBeanInfo;
import static java.util.Collections.emptyList;
import static java.util.Collections.unmodifiableList;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.log4j.Logger;
import org.reflections.Reflections;
import org.reflections.util.ConfigurationBuilder;
import org.reflections.util.ClasspathHelper;
import org.reflections.scanners.SubTypesScanner;
import org.reflections.scanners.TypeAnnotationsScanner;
import com.google.common.collect.ImmutableSet;
import com.cloud.utils.exception.CloudRuntimeException;
public class ReflectUtil {
private static final Logger s_logger = Logger.getLogger(ReflectUtil.class);
private static final Logger logger = Logger.getLogger(Reflections.class);
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;
}
}
// 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<?>>();
ConfigurationBuilder builder=new ConfigurationBuilder();
for (String packageName : packageNames) {
builder.addUrls(ClasspathHelper.forPackage(packageName));
}
builder.setScanners(new SubTypesScanner(),new TypeAnnotationsScanner());
reflections = new Reflections(builder);
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) && baseClass != 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
* @param cmdClass the class in which fields should be collected
* @param excludeClasses the classes whose fields must be ignored
* @return list of fields
*/
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;
}
public static List<String> flattenProperties(final Object target, final Class<?> clazz) {
return flattenPropeties(target, clazz, "class");
}
public static List<String> flattenPropeties(final Object target, final Class<?> clazz, final String... excludedProperties) {
return flattenProperties(target, clazz, ImmutableSet.copyOf(excludedProperties));
}
private static List<String> flattenProperties(final Object target, final Class<?> clazz, final ImmutableSet<String> excludedProperties) {
assert clazz != null;
if (target == null) {
return emptyList();
}
assert clazz.isAssignableFrom(target.getClass());
try {
final BeanInfo beanInfo = getBeanInfo(clazz);
final PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
final List<String> serializedProperties = new ArrayList<String>();
for (final PropertyDescriptor descriptor : descriptors) {
if (excludedProperties.contains(descriptor.getName())) {
continue;
}
serializedProperties.add(descriptor.getName());
final Object value = descriptor.getReadMethod().invoke(target);
serializedProperties.add(value != null ? value.toString() : "null");
}
return unmodifiableList(serializedProperties);
} catch (IntrospectionException e) {
s_logger.warn("Ignored IntrospectionException when serializing class " + target.getClass().getCanonicalName(), e);
} catch (IllegalArgumentException e) {
s_logger.warn("Ignored IllegalArgumentException when serializing class " + target.getClass().getCanonicalName(), e);
} catch (IllegalAccessException e) {
s_logger.warn("Ignored IllegalAccessException when serializing class " + target.getClass().getCanonicalName(), e);
} catch (InvocationTargetException e) {
s_logger.warn("Ignored InvocationTargetException when serializing class " + target.getClass().getCanonicalName(), e);
}
return emptyList();
}
public static String getEntityName(Class clz){
if(clz == null)
return null;
String entityName = clz.getName();
int index = entityName.lastIndexOf(".");
if (index != -1) {
return entityName.substring(index + 1);
}else{
return entityName;
}
}
}