/*
 * 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 java.io.IOException;

public final class GsonClassTypeAdapter extends TypeAdapter<Class<?>> {
	@Override
	public Class<?> read(JsonReader in) throws IOException {
		if (in.peek() == JsonToken.NULL) {
			in.nextNull();
			return null;
		}
		try {
			String className = in.nextString();
			return Class.forName(className);
		} catch (ClassNotFoundException e) {
			throw new IOException(e);
		}
	}

	@Override
	public void write(JsonWriter out, Class<?> type) throws IOException {
		if (type == null) {
			out.nullValue();
			return;
		}
		String className = type.getName();
		out.value(className);
	}
}