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    • io.airlift.http.server.GsonMessageBodyHandler Maven / Gradle / Ivy

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    package io.airlift.http.server;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.inject.Singleton;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

@Singleton
@Provider
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class GsonMessageBodyHandler implements MessageBodyWriter, MessageBodyReader {

  private static final String UTF_8 = "UTF-8";
  private Gson gson;

  private Gson getGson() {
    if (gson == null) {
      final GsonBuilder gsonBuilder = new GsonBuilder();
      gson = gsonBuilder.setPrettyPrinting().create();
    }
    return gson;
  }

  @Override
  public boolean isReadable(Class type, Type genericType, java.lang.annotation.Annotation[] annotations, MediaType mediaType) {
    return true;
  }

  @Override
  public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
    return true;
  }

  @Override
  public long getSize(Object object, Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
    return -1;
  }

  @Override
  public void writeTo(Object object, Class type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap httpHeaders, OutputStream entityStream)
      throws IOException, WebApplicationException {
    try (OutputStreamWriter writer = new OutputStreamWriter(entityStream, UTF_8)) {
      Type jsonType;
      if (type.equals(genericType)) {
        jsonType = type;
      } else {
        jsonType = genericType;
      }
      getGson().toJson(object, jsonType, writer);
    }
  }

  @Override
  public Object readFrom(Class type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap httpHeaders, InputStream entityStream) throws IOException,
      WebApplicationException {
    try (InputStreamReader streamReader = new InputStreamReader(entityStream, UTF_8)) {
      Type jsonType;
      if (type.equals(genericType)) {
        jsonType = type;
      } else {
        jsonType = genericType;
      }
      return getGson().fromJson(streamReader, jsonType);
    }
  }
}    
    
    
    

    




    
    
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