com.flipkart.android.proteus.demo.converter.GsonRequestBodyConverter.java Source code

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Here is the source code for com.flipkart.android.proteus.demo.converter.GsonRequestBodyConverter.java

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/*
 * Apache License
 * Version 2.0, January 2004
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 *
 * Copyright (c) 2017 Flipkart Internet Pvt. Ltd.
 *
 * 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.flipkart.android.proteus.demo.converter;

import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonWriter;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.lang.reflect.Type;
import java.nio.charset.Charset;

import okhttp3.MediaType;
import okhttp3.RequestBody;
import okio.Buffer;
import retrofit2.Converter;

final class GsonRequestBodyConverter<T> implements Converter<T, RequestBody> {
    private static final MediaType MEDIA_TYPE = MediaType.parse("application/json; charset=UTF-8");
    private static final Charset UTF_8 = Charset.forName("UTF-8");

    private final Gson gson;
    private final Type type;
    private TypeAdapter<T> typeAdapter;

    GsonRequestBodyConverter(Gson gson, Type type) {
        this.gson = gson;
        this.type = type;
    }

    private TypeAdapter<T> getAdapter() {
        if (null == typeAdapter) {
            //noinspection unchecked
            typeAdapter = (TypeAdapter<T>) gson.getAdapter(TypeToken.get(type));
        }
        return typeAdapter;
    }

    @Override
    public RequestBody convert(T value) throws IOException {
        TypeAdapter<T> adapter = getAdapter();
        Buffer buffer = new Buffer();
        Writer writer = new OutputStreamWriter(buffer.outputStream(), UTF_8);
        JsonWriter jsonWriter = gson.newJsonWriter(writer);
        jsonWriter.setSerializeNulls(true);
        adapter.write(jsonWriter, value);
        jsonWriter.close();
        return RequestBody.create(MEDIA_TYPE, buffer.readByteString());
    }
}