Examples of com.google.gson.stream.JsonWriter

com.google.gson.stream.JsonWriter

etf.org/rfc/rfc4627.txt">RFC 4627) encoded value to a stream, one token at a time. The stream includes both literal values (strings, numbers, booleans and nulls) as well as the begin and end delimiters of objects and arrays.

Encoding JSON

To encode your data as JSON, create a new {@code JsonWriter}. Each JSON document must contain one top-level array or object. Call methods on the writer as you walk the structure's contents, nesting arrays and objects as necessary:

To write arrays, first call {@link #beginArray()}. Write each of the array's elements with the appropriate {@link #value}methods or by nesting other arrays and objects. Finally close the array using {@link #endArray()}.
To write objects, first call {@link #beginObject()}. Write each of the object's properties by alternating calls to {@link #name} with the property's value. Write property values with theappropriate {@link #value} method or by nesting other objects or arrays.Finally close the object using {@link #endObject()}.

Example

Suppose we'd like to encode a stream of messages such as the following:

  {@code [}{ "id": 912345678901, "text": "How do I stream JSON in Java?", "geo": null, "user": { "name": "json_newb", "followers_count": 41 } }, { "id": 912345678902, "text": "@json_newb just use JsonWriter!", "geo": [50.454722, -104.606667], "user": { "name": "jesse", "followers_count": 2 } } ]}

This code encodes the above structure:

    {@code}public void writeJsonStream(OutputStream out, List messages) throws IOException  JsonWriter writer = new JsonWriter(new OutputStreamWriter(out, "UTF-8")); writer.setIndentSpaces(4); writeMessagesArray(writer, messages); writer.close(); } public void writeMessagesArray(JsonWriter writer, List messages) throws IOException { writer.beginArray(); for (Message message : messages) { writeMessage(writer, message); } writer.endArray(); } public void writeMessage(JsonWriter writer, Message message) throws IOException { writer.beginObject(); writer.name("id").value(message.getId()); writer.name("text").value(message.getText()); if (message.getGeo() != null) { writer.name("geo"); writeDoublesArray(writer, message.getGeo()); } else { writer.name("geo").nullValue(); } writer.name("user"); writeUser(writer, message.getUser()); writer.endObject(); } public void writeUser(JsonWriter writer, User user) throws IOException { writer.beginObject(); writer.name("name").value(user.getName()); writer.name("followers_count").value(user.getFollowersCount()); writer.endObject(); } public void writeDoublesArray(JsonWriter writer, List doubles) throws IOException { writer.beginArray(); for (Double value : doubles) { writer.value(value); } writer.endArray(); }}

Each {@code JsonWriter} may be used to write a single JSON stream.Instances of this class are not thread safe. Calls that would result in a malformed JSON string will fail with an {@link IllegalStateException}. @author Jesse Wilson @since 1.6

      if (!Strings.isNullOrEmpty(jsonpMethod)) {
        writer.write(jsonpMethod);
        writer.write("(");
      }


      jsonWriter = new JsonWriter(writer);
      jsonWriter.setHtmlSafe(false);
      jsonWriter.setIndent("  ");


      jsonWriter.beginObject(); // Main holder.

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      do {
        event = events.peekFirst();


        try {
          JsonWriter jsonWriter = new JsonWriter(writer);
          jsonWriter.setIndent("  ");
          jsonWriter.beginArray();
          jsonWriter.value(event.getType().name());
          gson.toJson(event, event.getClass(), jsonWriter);
          jsonWriter.endArray();
        } catch (Throwable t) {
          Closeables.close(writer, false);
          writer = null;


          SlaveMain.warn("Unhandled exception in event serialization.", t);

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      if (!Strings.isNullOrEmpty(jsonpMethod)) {
        writer.write(jsonpMethod);
        writer.write("(");
      }


      jsonWriter = new JsonWriter(writer);
      jsonWriter.setHtmlSafe(false);
      jsonWriter.setIndent("  ");


      jsonWriter.beginObject(); // Main holder.

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      if (!Strings.isNullOrEmpty(jsonpMethod)) {
        writer.write(jsonpMethod);
        writer.write("(");
      }


      jsonWriter = new JsonWriter(writer);
      jsonWriter.setHtmlSafe(false);
      jsonWriter.setIndent("  ");


      jsonWriter.beginObject(); // Main holder.

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        handleFailure(httpResponse);
        return;
      }


      ChannelBuffer channelBuffer = ChannelBuffers.dynamicBuffer();
      JsonWriter jsonWriter = new JsonWriter(new OutputStreamWriter(new ChannelBufferOutputStream(channelBuffer),
                                                                    Charsets.UTF_8));
      new Gson().toJson(object, object.getClass(), jsonWriter);
      jsonWriter.close();


      httpResponse.setContent(channelBuffer);
      httpResponse.setHeader(HttpHeaders.Names.CONTENT_TYPE, "application/json");
      httpResponse.setHeader(HttpHeaders.Names.CONTENT_LENGTH, channelBuffer.readableBytes());
      ChannelFuture result = channel.write(httpResponse);

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  private String buildString() {
    if (type.isSimpleType()) {
      return '"' + type.name().toLowerCase() + '"';
    }
    StringBuilder builder = new StringBuilder();
    JsonWriter writer = new JsonWriter(CharStreams.asWriter(builder));
    try {
      new SchemaTypeAdapter().write(writer, this);
      writer.close();
      return builder.toString();
    } catch (IOException e) {
      // It should never throw IOException on the StringBuilder Writer, if it does, something very wrong.
      throw Throwables.propagate(e);
    }

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   */
  @Override
  public void sendJson(HttpResponseStatus status, Object object, Type type, Gson gson) {
    try {
      ChannelBuffer channelBuffer = ChannelBuffers.dynamicBuffer();
      JsonWriter jsonWriter = new JsonWriter(new OutputStreamWriter(new ChannelBufferOutputStream(channelBuffer),
                                                                    Charsets.UTF_8));
      try {
        gson.toJson(object, type, jsonWriter);
      } finally {
        jsonWriter.close();
      }


      sendContent(status, channelBuffer, "application/json", ImmutableMultimap.<String, String>of());
    } catch (IOException e) {
      throw Throwables.propagate(e);

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      do {
        event = events.peekFirst();


        try {
          JsonWriter jsonWriter = new JsonWriter(writer);
          jsonWriter.setIndent("  ");
          jsonWriter.beginArray();
          jsonWriter.value(event.getType().name());
          gson.toJson(event, event.getClass(), jsonWriter);
          jsonWriter.endArray();
          jsonWriter.flush();
        } catch (Throwable t) {
          SlaveMain.warn("Unhandled exception in event serialization.", t);


          Closeables.closeQuietly(writer);
          writer = null;

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   */
  @Override
  public String toString() {
    try {
      StringWriter stringWriter = new StringWriter();
      JsonWriter jsonWriter = new JsonWriter(stringWriter);
      jsonWriter.setLenient(true);
      Streams.write(this, jsonWriter);
      return stringWriter.toString();
    } catch (IOException e) {
      throw new AssertionError(e);
    }

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        Multimap<String, Variable> variables = HashMultimap.create();
        for (Variable variable : _snitch.getVariables()) {
            variables.put(variable.getName(), variable);
        }


        JsonWriter writer = new JsonWriter(new BufferedWriter(response.getWriter()));
        writer.setIndent("  ");  // Pretty print by default


        try {
            writer.beginObject();
            for (String name : variables.keySet()) {
                Collection<Variable> vars = variables.get(name);


                writer.name(name);
                if (vars.size() > 1) {
                    // Only render as an array if we have a name collision
                    writer.beginArray();
                }
                for (Variable variable : vars) {
                    Formatter formatter = _snitch.getFormatter(variable);
                    formatter.format(variable.getValue(), writer);
                }
                if (vars.size() > 1) {
                    writer.endArray();
                }
            }
            writer.endObject();
        } finally {
            Closeables.closeQuietly(writer);
        }
    }

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