com.ticket.validation.terminal.restful.JsonObjectConverter.java Source code

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Here is the source code for com.ticket.validation.terminal.restful.JsonObjectConverter.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 com.ticket.validation.terminal.restful;

import com.google.gson.Gson;
import com.google.gson.JsonParseException;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Type;

import retrofit.converter.ConversionException;
import retrofit.converter.Converter;
import retrofit.mime.MimeUtil;
import retrofit.mime.TypedInput;
import retrofit.mime.TypedOutput;

public class JsonObjectConverter implements Converter {

    private String encoding;

    public JsonObjectConverter() {
        this("UTF-8");
    }

    public JsonObjectConverter(String encoding) {
        this.encoding = encoding;
    }

    @Override
    public Object fromBody(TypedInput body, Type type) throws ConversionException {
        String charset = "UTF-8";
        if (body.mimeType() != null) {
            charset = MimeUtil.parseCharset(body.mimeType());
        }
        try {
            String json = inputSteamToString(body.in(), charset);

            return new JSONObject(json);
        } catch (IOException e) {
            throw new ConversionException(e);
        } catch (JsonParseException e) {
            throw new ConversionException(e);
        } catch (JSONException e) {
            throw new ConversionException(e);
        } finally {
            try {
                body.in().close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public TypedOutput toBody(Object object) {
        try {
            return new JsonTypedOutput(new Gson().toJson(object).getBytes(encoding), encoding);
        } catch (UnsupportedEncodingException e) {
            throw new AssertionError(e);
        }
    }

    private static class JsonTypedOutput implements TypedOutput {
        private final byte[] jsonBytes;
        private final String mimeType;

        JsonTypedOutput(byte[] jsonBytes, String encode) {
            this.jsonBytes = jsonBytes;
            this.mimeType = "application/json; charset=" + encode;
        }

        @Override
        public String fileName() {
            return null;
        }

        @Override
        public String mimeType() {
            return mimeType;
        }

        @Override
        public long length() {
            return jsonBytes.length;
        }

        @Override
        public void writeTo(OutputStream out) throws IOException {
            out.write(jsonBytes);
        }
    }

    public static String inputSteamToString(InputStream is, String charset) throws IOException {
        final int BUFFER_SIZE = 1024;

        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] data = new byte[BUFFER_SIZE];
        int count = -1;

        while ((count = is.read(data, 0, BUFFER_SIZE)) != -1)
            outStream.write(data, 0, count);

        data = null;
        return new String(outStream.toByteArray(), charset);
    }
}