com.hileone.restretrofit.request.BuiltInConverters.java Source code

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Here is the source code for com.hileone.restretrofit.request.BuiltInConverters.java

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/*
 * Copyright (C) 2015 Square, Inc.
 *
 * 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.hileone.restretrofit.request;

import com.google.gson.TypeAdapter;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonWriter;
import com.hileone.restretrofit.utils.GsonUtils;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.RequestBody;

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

import okio.Buffer;

public final class BuiltInConverters extends Converter.Factory {

    @Override
    public Converter<?, RequestBody> requestBodyConverter(Type type, Annotation[] annotations) {
        TypeAdapter<?> adapter = GsonUtils.getGson().getAdapter(TypeToken.get(type));
        return new GsonRequestBodyConverter<>(adapter);
    }

    @Override
    public Converter<?, String> stringConverter(Type type, Annotation[] annotations) {
        if (type == String.class) {
            return StringConverter.INSTANCE;
        }
        return null;
    }

    static final class StringConverter implements Converter<String, String> {
        static final StringConverter INSTANCE = new StringConverter();

        @Override
        public String convert(String value) throws IOException {
            return value;
        }
    }

    static final class ToStringConverter implements Converter<Object, String> {
        static final ToStringConverter INSTANCE = new ToStringConverter();

        @Override
        public String convert(Object value) {
            return value.toString();
        }
    }

    static 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 TypeAdapter<T> adapter;

        /**
         * GsonRequestBodyConverter
         * @param adapter adapter
         */
        GsonRequestBodyConverter(TypeAdapter<T> adapter) {
            this.adapter = adapter;
        }

        @Override
        public RequestBody convert(T value) throws IOException {
            Buffer buffer = new Buffer();
            Writer writer = new OutputStreamWriter(buffer.outputStream(), UTF_8);
            JsonWriter jsonWriter = GsonUtils.getGson().newJsonWriter(writer);
            try {
                adapter.write(jsonWriter, value);
                jsonWriter.flush();
            } catch (IOException e) {
                // Writing to Buffer does no I/O.
                throw new AssertionError(e);
            }
            return RequestBody.create(MEDIA_TYPE, buffer.readByteString());
        }
    }

}