com.vmware.xenon.common.serialization.GsonSerializers Maven / Gradle / Ivy
/*
* Copyright (c) 2017 VMware, Inc. 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.
*/
package com.vmware.xenon.common.serialization;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Comparator;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListMap;
import com.vmware.xenon.common.FNVHash;
/**
* Infrastructure use only.
* Entrypoint to Gson customization/internals.
*/
public final class GsonSerializers {
private static final JsonMapper JSON = new JsonMapper();
private static final ConcurrentMap, JsonMapper> CUSTOM_JSON = new ConcurrentSkipListMap<>(
Comparator.comparingInt((Class c) -> c.hashCode()).thenComparing(Class::getName));
private GsonSerializers() {
}
public static JsonMapper getJsonMapperFor(Object instance) {
if (instance == null) {
return JSON;
}
return getJsonMapperFor(instance.getClass());
}
public static JsonMapper getJsonMapperFor(Class type) {
if (type.isArray() && type != byte[].class) {
type = type.getComponentType();
}
return CUSTOM_JSON.getOrDefault(type, JSON);
}
public static JsonMapper getJsonMapperFor(Type type) {
if (type instanceof Class) {
return getJsonMapperFor((Class) type);
} else if (type instanceof ParameterizedType) {
Type rawType = ((ParameterizedType) type).getRawType();
return getJsonMapperFor(rawType);
} else {
return JSON;
}
}
public static void registerCustomJsonMapper(Class clazz,
JsonMapper mapper) {
CUSTOM_JSON.putIfAbsent(clazz, mapper);
}
public static long hashJson(Object body, long hash) {
if (body instanceof String) {
return FNVHash.compute((String) body, hash);
}
JsonMapper mapper = getJsonMapperFor(body);
return mapper.hashJson(body, hash);
}
}