com.github.ljtfreitas.restify.http.client.message.converter.json.GsonMessageConverter.java Source code

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Here is the source code for com.github.ljtfreitas.restify.http.client.message.converter.json.GsonMessageConverter.java

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/*******************************************************************************
 *
 * MIT License
 *
 * Copyright (c) 2016 Tiago de Freitas Lima
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *******************************************************************************/
package com.github.ljtfreitas.restify.http.client.message.converter.json;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.lang.reflect.Type;

import com.github.ljtfreitas.restify.http.client.request.HttpRequestMessage;
import com.github.ljtfreitas.restify.http.client.request.RestifyHttpMessageWriteException;
import com.github.ljtfreitas.restify.http.client.response.HttpResponseMessage;
import com.github.ljtfreitas.restify.http.client.response.RestifyHttpMessageReadException;
import com.google.gson.Gson;
import com.google.gson.JsonIOException;
import com.google.gson.JsonSyntaxException;
import com.google.gson.reflect.TypeToken;

public class GsonMessageConverter<T> extends JsonMessageConverter<T> {

    private final Gson gson;

    public GsonMessageConverter() {
        this(new Gson());
    }

    public GsonMessageConverter(Gson gson) {
        this.gson = new Gson();
    }

    @Override
    public boolean canRead(Type type) {
        return true;
    }

    @Override
    public T read(HttpResponseMessage httpResponseMessage, Type expectedType)
            throws RestifyHttpMessageReadException {
        try {
            TypeToken<?> token = TypeToken.get(expectedType);

            Reader json = new InputStreamReader(httpResponseMessage.body());

            return this.gson.fromJson(json, token.getType());
        } catch (JsonIOException | JsonSyntaxException e) {
            throw new RestifyHttpMessageReadException(e);
        }
    }

    @Override
    public boolean canWrite(Class<?> type) {
        return true;
    }

    @Override
    public void write(Object body, HttpRequestMessage httpRequestMessage) throws RestifyHttpMessageWriteException {
        OutputStreamWriter writer = new OutputStreamWriter(httpRequestMessage.output(),
                httpRequestMessage.charset());

        try {
            gson.toJson(body, writer);

            writer.close();

        } catch (JsonIOException | IOException e) {
            throw new RestifyHttpMessageWriteException(e);
        }
    }
}