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

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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.lang.reflect.Type;
import java.util.Arrays;

import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;
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;

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

    private final ObjectMapper objectMapper;

    public JacksonMessageConverter() {
        this(new ObjectMapper());
    }

    public JacksonMessageConverter(ObjectMapper objectMapper) {
        this.objectMapper = objectMapper;
    }

    @Override
    public boolean canRead(Type type) {
        TypeFactory typeFactory = objectMapper.getTypeFactory();
        return objectMapper.canDeserialize(typeFactory.constructType(type));
    }

    @Override
    public T read(HttpResponseMessage httpResponseMessage, Type expectedType)
            throws RestifyHttpMessageReadException {
        try {
            TypeFactory typeFactory = objectMapper.getTypeFactory();

            return objectMapper.readValue(httpResponseMessage.body(), typeFactory.constructType(expectedType));

        } catch (IOException e) {
            throw new RestifyHttpMessageReadException(e);
        }
    }

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

    @Override
    public void write(T body, HttpRequestMessage httpRequestMessage) throws RestifyHttpMessageWriteException {
        try {
            JsonEncoding encoding = Arrays.stream(JsonEncoding.values())
                    .filter(e -> e.getJavaName().equals(httpRequestMessage.charset())).findFirst()
                    .orElse(JsonEncoding.UTF8);

            JsonGenerator generator = objectMapper.getFactory().createGenerator(httpRequestMessage.output(),
                    encoding);

            objectMapper.writeValue(generator, body);
            generator.flush();

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

    }
}