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/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 - 2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.so;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public final class SerializableChecker {
public static class SerializationFailure {
private final String mContainingClass;
private final String mMemberName;
public SerializationFailure(String inNonSerializableClass, String inMemberName) {
mContainingClass = inNonSerializableClass;
mMemberName = inMemberName;
}
public String getContainingClass() {
return mContainingClass;
}
public String getMemberName() {
return mMemberName;
}
public String getBadMemberString() {
if (mMemberName == null)
return mContainingClass;
return mContainingClass + "." + mMemberName;
}
@Override
public String toString() {
return "SerializationFailure [mNonSerializableClass=" + mContainingClass + ", mMemberName=" + mMemberName
+ "]";
}
}
private static class SerializationCheckerData {
private Set<Class<?>> mSerializableClasses;
SerializationCheckerData() {
mSerializableClasses = new HashSet<Class<?>>();
}
boolean isAlreadyChecked(Class<?> inClass) {
return mSerializableClasses.contains(inClass);
}
void addSerializableClass(Class<?> inClass) {
mSerializableClasses.add(inClass);
}
}
private SerializableChecker() {}
public static SerializationFailure isFullySerializable(Class<?> inClass) {
if (!isSerializable(inClass))
return new SerializationFailure(inClass.getName(), null);
return isFullySerializable(inClass, new SerializationCheckerData());
}
private static SerializationFailure isFullySerializable(Class<?> inClass,
SerializationCheckerData inSerializationCheckerData) {
for (Field field : declaredFields(inClass)) {
Class<?> fieldDeclaringClass = field.getType();
if (field.getType() == Object.class)
continue;
if (Modifier.isStatic(field.getModifiers()))
continue;
if (field.isSynthetic())
continue;
if (fieldDeclaringClass.isInterface() || fieldDeclaringClass.isPrimitive())
continue;
if (Modifier.isAbstract(field.getType().getModifiers()))
continue;
if (inSerializationCheckerData.isAlreadyChecked(fieldDeclaringClass))
continue;
if (isSerializable(fieldDeclaringClass)) {
inSerializationCheckerData.addSerializableClass(inClass);
SerializationFailure failure = isFullySerializable(field.getType(), inSerializationCheckerData);
if (failure != null)
return failure;
else
continue;
}
if (Modifier.isTransient(field.getModifiers()))
continue;
return new SerializationFailure(field.getDeclaringClass().getName(), field.getName());
}
return null;
}
private static boolean isSerializable(Class<?> inClass) {
Set<Class<?>> interfaces = getInterfaces(inClass);
if (interfaces == null)
return false;
boolean isSerializable = interfaces.contains(Serializable.class);
if (isSerializable)
return true;
for (Class<?> classInterface : interfaces) {
if (isSerializable(classInterface))
return true;
}
if (inClass.getSuperclass() != null && isSerializable(inClass.getSuperclass()))
return true;
return false;
}
private static Set<Class<?>> getInterfaces(Class<?> inFieldDeclaringClass) {
return new HashSet<Class<?>>(Arrays.asList(inFieldDeclaringClass.getInterfaces()));
}
private static List<Field> declaredFields(Class<?> inClass) {
List<Field> fields = new ArrayList<Field>(Arrays.asList(inClass.getDeclaredFields()));
Class<?> parentClasses = inClass.getSuperclass();
if (parentClasses == null)
return fields;
fields.addAll(declaredFields(parentClasses));
return fields;
}
}
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