retrofit.converter.GsonConverter.java Source code

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Here is the source code for retrofit.converter.GsonConverter.java

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/*
 * Copyright (C) 2012 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 retrofit.converter;

import com.google.gson.Gson;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.ResponseBody;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Type;
import java.nio.charset.Charset;

/**
 * A {@link Converter} which uses GSON for serialization and deserialization of entities.
 */
public class GsonConverter implements Converter {
    private final Gson gson;
    private final Charset charset;
    private final MediaType mediaType;

    /**
     * Create an instance using a default {@link Gson} instance for conversion. Encoding to JSON and
     * decoding from JSON (when no charset is specified by a header) will use UTF-8.
     */
    public GsonConverter() {
        this(new Gson());
    }

    /**
     * Create an instance using the supplied {@link Gson} object for conversion. Encoding to JSON and
     * decoding from JSON (when no charset is specified by a header) will use UTF-8.
     */
    public GsonConverter(Gson gson) {
        this(gson, Charset.forName("UTF-8"));
    }

    /**
     * Create an instance using the supplied {@link Gson} object for conversion. Encoding to JSON and
     * decoding from JSON (when no charset is specified by a header) will use the specified charset.
     */
    public GsonConverter(Gson gson, Charset charset) {
        if (gson == null)
            throw new NullPointerException("gson == null");
        if (charset == null)
            throw new NullPointerException("charset == null");
        this.gson = gson;
        this.charset = charset;
        this.mediaType = MediaType.parse("application/json; charset=" + charset.name());
    }

    @Override
    public Object fromBody(ResponseBody body, Type type) throws IOException {
        Charset charset = this.charset;
        if (body.contentType() != null) {
            charset = body.contentType().charset(charset);
        }

        InputStream is = body.byteStream();
        try {
            return gson.fromJson(new InputStreamReader(is, charset), type);
        } finally {
            try {
                is.close();
            } catch (IOException ignored) {
            }
        }
    }

    @Override
    public RequestBody toBody(Object object, Type type) {
        String json = gson.toJson(object, type);
        return RequestBody.create(mediaType, json);
    }
}