/**
* Copyright (C) 2012 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.web.analytics.json;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
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.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import org.json.JSONException;
import org.json.JSONObject;
import com.google.common.collect.ImmutableMap;
import com.opengamma.OpenGammaRuntimeException;
import com.opengamma.util.ArgumentChecker;
import com.opengamma.web.analytics.AnalyticsNodeJsonWriter;
import com.opengamma.web.analytics.DependencyGraphGridStructure;
import com.opengamma.web.analytics.GridColumnsJsonWriter;
import com.opengamma.web.analytics.PortfolioGridStructure;
import com.opengamma.web.json.ValueRequirementJSONBuilder;
/**
* Writes an instance of {@link PortfolioGridStructure} to JSON.
*/
@Provider
@Produces(MediaType.APPLICATION_JSON)
public class DependencyGraphGridStructureMessageBodyWriter implements MessageBodyWriter<DependencyGraphGridStructure> {
/** Field name for the JSON. */
private static final String COLUMN_SETS = "columnSets";
/** Field name for the JSON. */
private static final String ROOT_NODE = "rootNode";
/** Field name for the JSON. */
private static final String CALC_CONFIG_NAME = "calcConfigName";
/** Field name for the JSON. */
private static final String VALUE_REQUIREMENT = "valueRequirement";
private final GridColumnsJsonWriter _writer;
public DependencyGraphGridStructureMessageBodyWriter(GridColumnsJsonWriter writer) {
ArgumentChecker.notNull(writer, "writer");
_writer = writer;
}
@Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return type.equals(DependencyGraphGridStructure.class);
}
@Override
public long getSize(DependencyGraphGridStructure gridStructure,
Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
// TODO this means unknown size. is it worth encoding it twice to find out the size?
return -1;
}
@Override
public void writeTo(DependencyGraphGridStructure gridStructure,
Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders,
OutputStream entityStream) throws IOException, WebApplicationException {
Object[] rootNode = AnalyticsNodeJsonWriter.getJsonStructure(gridStructure.getRootNode());
List<Map<String, Object>> columns = _writer.getJsonStructure(gridStructure.getColumnStructure().getGroups());
ValueRequirementJSONBuilder jsonBuilder = new ValueRequirementJSONBuilder();
String valueReqStr = jsonBuilder.toJSON(gridStructure.getRootRequirement());
JSONObject valueReqJson;
try {
// need to convert it to a JSON object instead of a string otherwise it will be inserted into the outer object
// as an escaped string instead of a child object
valueReqJson = new JSONObject(valueReqStr);
} catch (JSONException e) {
throw new OpenGammaRuntimeException("Failed to convert ValueRequirement to JSON", e);
}
String calcConfigName = gridStructure.getCalculationConfigurationName();
ImmutableMap<String, Object> jsonMap = ImmutableMap.of(COLUMN_SETS, columns,
ROOT_NODE, rootNode,
CALC_CONFIG_NAME, calcConfigName,
VALUE_REQUIREMENT, valueReqJson);
entityStream.write(new JSONObject(jsonMap).toString().getBytes());
}
}