com.wavefront.agent.JsonNodeWriter Maven / Gradle / Ivy
package com.wavefront.agent;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
/**
* Writer that serializes JsonNodes.
*
* @author Clement Pang ([email protected])
*/
public class JsonNodeWriter implements MessageBodyWriter {
private final ObjectMapper mapper = new ObjectMapper();
private final JsonFactory factory = new JsonFactory();
@Override
public boolean isWriteable(
Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return JsonNode.class.isAssignableFrom(type);
}
@Override
public long getSize(
JsonNode jsonNode,
Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return -1;
}
@Override
public void writeTo(
JsonNode jsonNode,
Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap httpHeaders,
OutputStream entityStream)
throws IOException, WebApplicationException {
JsonGenerator generator = factory.createGenerator(entityStream);
mapper.writeTree(generator, jsonNode);
}
}