/*
 * Copyright (C) 2015 SoftIndex LLC.
 *
 * 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 io.datakernel.datagraph.server;

import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import io.datakernel.datagraph.graph.StreamId;

import java.io.IOException;

public final class GsonStreamIdAdapter extends TypeAdapter<StreamId> {
	@Override
	public StreamId read(JsonReader reader) throws IOException {
		if (reader.peek() == JsonToken.NULL) {
			reader.nextNull();
			return null;
		}
		return new StreamId(reader.nextLong());
	}

	@Override
	public void write(JsonWriter writer, StreamId value) throws IOException {
		if (value == null) {
			writer.nullValue();
			return;
		}
		writer.value(value.id);
	}
}