/
JsonSerializer.java
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/
JsonSerializer.java
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/*
* Copyright 2018 The Exonum Team
*
* 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.exonum.binding.common.serialization.json;
import com.exonum.binding.common.crypto.PublicKey;
import com.exonum.binding.common.hash.HashCode;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.LongSerializationPolicy;
/**
* Provides {@link Gson} serializer for converting Java objects to Json and vice versa.
* It is configured to serialize Exonum objects in a format, compatible with the core framework
* and light clients (e.g., {@link HashCode} as a hex string).
*/
public final class JsonSerializer {
private static final Gson INSTANCE = builder().create();
/**
* Returns preconfigured {@link Gson} builder instance. Can be useful in cases when
* some customization is required. For example, type adapters should be extended or replaced.
*/
public static GsonBuilder builder() {
return new GsonBuilder()
.registerTypeHierarchyAdapter(HashCode.class, new HashCodeJsonSerializer())
.registerTypeAdapter(PublicKey.class, new PublicKeyJsonSerializer())
.registerTypeAdapterFactory(StoredConfigurationAdapterFactory.create())
.setLongSerializationPolicy(LongSerializationPolicy.STRING);
}
/**
* Returns preconfigured {@link Gson} instance. Helpful in cases when no additional configuration
* of the Json serializer is required.
*/
public static Gson json() {
return INSTANCE;
}
private JsonSerializer() {
}
}