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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019 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.policy.common.gson;
import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.JsonElement;
import java.lang.reflect.GenericArrayType;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* Excludes all fields from serialization/deserialization, if the class is managed.
*/
public class JacksonExclusionStrategy implements ExclusionStrategy {
/**
* Classes that are explicitly not managed by the GSON jackson adapters.
*/
// @formatter:off
private static final Set<Class<?>> unmanaged = new HashSet<>(Arrays.asList(
boolean.class,
byte.class,
short.class,
int.class,
long.class,
float.class,
double.class,
char.class,
Boolean.class,
Byte.class,
Short.class,
Integer.class,
Long.class,
Float.class,
Double.class,
Character.class,
String.class));
// @formatter:on
/**
* Classes whose subclasses are explicitly not managed by the GSON jackson adapters.
*/
// @formatter:off
private static final Set<Class<?>> unmanagedSuper = new HashSet<>(Arrays.asList(
GenericArrayType.class,
Map.class,
Collection.class,
JsonElement.class));
// @formatter:on
@Override
public boolean shouldSkipField(FieldAttributes attrs) {
return isManaged(attrs.getDeclaringClass());
}
@Override
public boolean shouldSkipClass(Class<?> clazz) {
return false;
}
/**
* Determines if a class is managed by this adapter, which typically means that it is
* <i>not</i> a generic class such as {@link JsonElement} or some type of collection.
*
* @param clazz the class to be examined
* @return {@code true} if the class is managed by this adapter, {@code false}
* otherwise
*/
public static boolean isManaged(Class<?> clazz) {
if (clazz.isArray() || clazz.isEnum() || clazz.isPrimitive() || unmanaged.contains(clazz)) {
return false;
}
for (Class<?> sup : unmanagedSuper) {
if (sup.isAssignableFrom(clazz)) {
return false;
}
}
return true;
}
}
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