Java JsonGenerator.writeFieldName方法代碼示例

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
@Override
public String next()
{
    CSVRecord record = inner.next();
    StringWriter json = new StringWriter();
    try {
        JsonGenerator gen = jsonFactory.createJsonGenerator(json);
        gen.writeStartObject();
        for (CSVHeaderMap.Entry entry : headerMap.entries()) {
            String name = entry.getName();
            String value = record.get(entry.getIndex());

            gen.writeFieldName(name);
            entry.getWriter().write(gen, value);
        }
        gen.writeEndObject();
        gen.close();
    }
    catch (IOException e) {
        throw new RuntimeException(e);
    }
    return json.toString();
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
private static void writeAttribute(JsonGenerator jg, String attName, final String descriptionStr,
    Object value)
throws IOException {
  boolean description = false;
  if (descriptionStr != null && descriptionStr.length() > 0 && !attName.equals(descriptionStr)) {
    description = true;
    jg.writeFieldName(attName);
    jg.writeStartObject();
    jg.writeFieldName("description");
    jg.writeString(descriptionStr);
    jg.writeFieldName("value");
    writeObject(jg, description, value);
    jg.writeEndObject();
  } else {
    jg.writeFieldName(attName);
    writeObject(jg, description, value);
  }
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
/**
 * Populate transaction meta data into the record if requested.
 *
 * @param jg the handle to the JsonGenerator
 * @param op the database operation we are processing.
 * @throws IOException if a JSON encoding error occurs
 */
private void setBeforeInfo(JsonGenerator jg, DownstreamOperation op) throws IOException {
    LOG.debug("setBeforeInfo()");

    jg.writeFieldName("priorValues");
    jg.writeStartObject();
    // loop through operatons with calls to appropriate jg.write() methods
    for (DownstreamColumnData col : op.getBefores()) {
        if (textOnly == true) {
            jg.writeStringField(col.getBDName(), col.asString());
        } else {
            // Encode the data appropriately: handle numbers as numbers, etc.
            int jdbcType;
            jdbcType = op.getTableMeta().getColumn(col.getOrigName()).getJdbcType();
            encodeColumn(col, jdbcType, jg);
        }
    }
    jg.writeEndObject();
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
/**
 * Render this as <a href="http://json.org/">JSON</a>.
 *
 * @param pretty if true, pretty-print JSON.
 */
public String toString(boolean pretty) {
    try {
        StringWriter writer = new StringWriter();
        JsonGenerator gen = FACTORY.createJsonGenerator(writer);
        if (pretty) gen.useDefaultPrettyPrinter();

        if (this instanceof PrimitiveSchema || this instanceof UnionSchema) {
            gen.writeStartObject();
            gen.writeFieldName("type");
        }

        writeJson(gen, new SchemaNames(), null);

        if (this instanceof PrimitiveSchema || this instanceof UnionSchema) {
            gen.writeEndObject();
        }

        gen.flush();
        return writer.toString();
    } catch (IOException e) {
        throw new BaijiRuntimeException(e);
    }
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
@Override
protected void writeJsonFields(JsonGenerator gen, SchemaNames names) throws IOException {
    schemaName.writeJSON(gen);

    if (StringUtils.hasLength(doc)) {
        gen.writeFieldName("doc");
        gen.writeString(doc);
    }

    if (aliases != null) {
        gen.writeFieldName("aliases");
        gen.writeStartArray();
        for (String a : aliases) {
            gen.writeString(a);
        }
        gen.writeEndArray();
    }
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
/**
 *  Writes out all the parameters and their properties (final and resource) to
 *  the given {@link Writer}
 *  The format of the output would be 
 *  { "properties" : [ {key1,value1,key1.isFinal,key1.resource}, {key2,value2,
 *  key2.isFinal,key2.resource}... ] } 
 *  It does not output the parameters of the configuration object which is 
 *  loaded from an input stream.
 * @param out the Writer to write to
 * @throws IOException
 */
public static void dumpConfiguration(Configuration config,
    Writer out) throws IOException {
  JsonFactory dumpFactory = new JsonFactory();
  JsonGenerator dumpGenerator = dumpFactory.createJsonGenerator(out);
  dumpGenerator.writeStartObject();
  dumpGenerator.writeFieldName("properties");
  dumpGenerator.writeStartArray();
  dumpGenerator.flush();
  synchronized (config) {
    for (Map.Entry<Object,Object> item: config.getProps().entrySet()) {
      dumpGenerator.writeStartObject();
      dumpGenerator.writeStringField("key", (String) item.getKey());
      dumpGenerator.writeStringField("value", 
                                     config.get((String) item.getKey()));
      dumpGenerator.writeBooleanField("isFinal",
                                      config.finalParameters.contains(item.getKey()));
      String[] resources = config.updatingResource.get(item.getKey());
      String resource = UNKNOWN_RESOURCE;
      if(resources != null && resources.length > 0) {
        resource = resources[0];
      }
      dumpGenerator.writeStringField("resource", resource);
      dumpGenerator.writeEndObject();
    }
  }
  dumpGenerator.writeEndArray();
  dumpGenerator.writeEndObject();
  dumpGenerator.flush();
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
/***
 * Dumps the configuration of hierarchy of queues with 
 * the xml file path given. It is to be used directly ONLY FOR TESTING.
 * @param out the writer object to which dump is written to.
 * @param configFile the filename of xml file
 * @throws IOException
 */
static void dumpConfiguration(Writer out, String configFile,
    Configuration conf) throws IOException {
  if (conf != null && conf.get(DeprecatedQueueConfigurationParser.
      MAPRED_QUEUE_NAMES_KEY) != null) {
    return;
  }
  
  JsonFactory dumpFactory = new JsonFactory();
  JsonGenerator dumpGenerator = dumpFactory.createJsonGenerator(out);
  QueueConfigurationParser parser;
  boolean aclsEnabled = false;
  if (conf != null) {
    aclsEnabled = conf.getBoolean(MRConfig.MR_ACLS_ENABLED, false);
  }
  if (configFile != null && !"".equals(configFile)) {
    parser = new QueueConfigurationParser(configFile, aclsEnabled);
  }
  else {
    parser = getQueueConfigurationParser(null, false, aclsEnabled);
  }
  dumpGenerator.writeStartObject();
  dumpGenerator.writeFieldName("queues");
  dumpGenerator.writeStartArray();
  dumpConfiguration(dumpGenerator,parser.getRoot().getChildren());
  dumpGenerator.writeEndArray();
  dumpGenerator.writeEndObject();
  dumpGenerator.flush();
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
@Override
public void serialize(final MediaType mediaType, final JsonGenerator generator, final SerializerProvider provider)
        throws IOException {
    generator.writeStartObject();
    generator.writeFieldName("name");
    generator.writeString(mediaType.name());
    generator.writeFieldName("displayName");
    generator.writeString(mediaType.getDisplayName());
    generator.writeEndObject();
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
@Override
public void serialize(
        final Object nullKey,
        final JsonGenerator jsonGenerator,
        final SerializerProvider unused) throws IOException, JsonProcessingException {
    jsonGenerator.writeFieldName("");
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
/**
 * Used to write the state of the ClusterNode instance to disk, when we are
 * persisting the state of the NodeManager
 * @param jsonGenerator The JsonGenerator instance being used to write JSON
 *                      to disk
 * @throws IOException
 */
public void write(JsonGenerator jsonGenerator) throws IOException {
  jsonGenerator.writeStartObject();

  // clusterNodeInfo begins
  jsonGenerator.writeFieldName("clusterNodeInfo");
  jsonGenerator.writeStartObject();
  jsonGenerator.writeStringField("name", clusterNodeInfo.name);
  jsonGenerator.writeObjectField("address", clusterNodeInfo.address);
  jsonGenerator.writeObjectField("total", clusterNodeInfo.total);
  jsonGenerator.writeObjectField("free", clusterNodeInfo.free);
  jsonGenerator.writeObjectField("resourceInfos",
    clusterNodeInfo.resourceInfos);
  jsonGenerator.writeEndObject();
  // clusterNodeInfo ends

  // grants begins
  jsonGenerator.writeFieldName("grants");
  jsonGenerator.writeStartObject();
  for (Map.Entry<GrantId, ResourceRequestInfo> entry : grants.entrySet()) {
    jsonGenerator.writeFieldName(entry.getKey().unique);
    jsonGenerator.writeStartObject();
    jsonGenerator.writeFieldName("grantId");
    entry.getKey().write(jsonGenerator);
    jsonGenerator.writeFieldName("grant");
    entry.getValue().write(jsonGenerator);
    jsonGenerator.writeEndObject();
  }
  jsonGenerator.writeEndObject();
  // grants ends

  jsonGenerator.writeEndObject();
  // We skip the hostNode and lastHeartbeatTime as they need not be persisted.
  // resourceTypeToMaxCpu and resourceTypeToStatsMap can be rebuilt using the
  // conf and the grants respectively.
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
/**
 * Used to write the state of the SessionNotificationCtx instance to disk,
 * when we are persisting the state of the ClusterManager
 * @param jsonGenerator The JsonGenerator instance being used to write JSON
 *                      to disk
 * @throws IOException
 */
public void write(JsonGenerator jsonGenerator) throws IOException {
  jsonGenerator.writeStartObject();

  jsonGenerator.writeStringField("handle", handle);

  jsonGenerator.writeStringField("host", host);

  jsonGenerator.writeNumberField("port", port);

  jsonGenerator.writeNumberField("numPendingCalls", pendingCalls.size());

  jsonGenerator.writeFieldName("pendingCalls");
  jsonGenerator.writeStartArray();
  for (TBase call : pendingCalls) {
    jsonGenerator.writeStartObject();

    // TBase is an abstract class. While reading back, we want to know
    // what kind of object we actually wrote. Jackson does provide two methods
    // to do it automatically, but one of them adds types at a lot of places
    // where we don't need it, and hence our parsing would be required to be
    // changed. The other required adding an annotation to the TBase class,
    // which we can't do, since it is auto-generated by Thrift.
    String callType = call.getClass().getName();
    jsonGenerator.writeStringField("callType", callType);

    jsonGenerator.writeObjectField("call", call);

    jsonGenerator.writeEndObject();
  }
  jsonGenerator.writeEndArray();

  jsonGenerator.writeEndObject();
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
/**
 * Used to write the state of the SessionNotifier instance to disk, when we
 * are persisting the state of the ClusterManager
 *
 * @param jsonGenerator The JsonGenerator instance being used to write JSON
 *                      to disk
 * @throws IOException
 */
public void write(JsonGenerator jsonGenerator) throws IOException {
  jsonGenerator.writeStartObject();

  int totalSessionsToCtx = 0, totalDeletedSessions = 0;
  for (int i = 0; i < numNotifierThreads; i++) {
    totalSessionsToCtx += notifierThreads[i].sessionsToCtx.size();
    totalDeletedSessions += notifierThreads[i].deletedSessions.size();
  }

  jsonGenerator.writeNumberField("totalSessionsToCtx",
                                  totalSessionsToCtx);

  jsonGenerator.writeFieldName("sessionsToCtx");
  jsonGenerator.writeStartObject();
  for (int i = 0; i < numNotifierThreads; i++) {
    for (ConcurrentMap.Entry<String, SessionNotificationCtx> entry :
      notifierThreads[i].sessionsToCtx.entrySet()) {
      jsonGenerator.writeFieldName(entry.getKey());
      entry.getValue().write(jsonGenerator);
    }
  }
  jsonGenerator.writeEndObject();

  jsonGenerator.writeNumberField("totalDeletedSessions",
                                  totalDeletedSessions);

  jsonGenerator.writeFieldName("deletedSessions");
  jsonGenerator.writeStartArray();
  for (int i = 0; i < numNotifierThreads; i++) {
    for (String deletedSessionHandle :
          notifierThreads[i].deletedSessions.keySet()) {
      jsonGenerator.writeString(deletedSessionHandle);
    }
  }
  jsonGenerator.writeEndArray();

  jsonGenerator.writeEndObject();
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
/**
 * This function saves the state of the ClusterManager to disk.
 * @return A boolean. True if saving the state succeeded, false otherwise.
 */
@Override
public boolean persistState() {
  if (!safeMode) {
    LOG.info(
      "Cannot persist state because ClusterManager is not in Safe Mode");
    return false;
  }

  try {
    JsonGenerator jsonGenerator = CoronaSerializer.createJsonGenerator(conf);
    jsonGenerator.writeStartObject();

    jsonGenerator.writeFieldName("startTime");
    jsonGenerator.writeNumber(startTime);

    jsonGenerator.writeFieldName("nodeManager");
    nodeManager.write(jsonGenerator);

    jsonGenerator.writeFieldName("sessionManager");
    sessionManager.write(jsonGenerator);

    jsonGenerator.writeFieldName("sessionNotifier");
    sessionNotifier.write(jsonGenerator);

    jsonGenerator.writeEndObject();
    jsonGenerator.close();
  } catch (IOException e) {
    LOG.info("Could not persist the state: ", e);
    return false;
  }
  return true;
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
@Override
protected void writeJsonFields(JsonGenerator gen, SchemaNames names) throws IOException {
    super.writeJsonFields(gen, names);

    gen.writeFieldName("fields");
    gen.writeStartArray();

    if (fields != null && fields.size() > 0) {
        for (Field field : fields) {
            field.writeJSON(gen, names);
        }
    }
    gen.writeEndArray();
}
 

import org.codehaus.jackson.JsonGenerator; //導入方法依賴的package包/類
/** Called to write map.*/
private void writeMap(MapSchema mapSchema, Map map, JsonGenerator generator) throws IOException {
    Schema valueSchema = mapSchema.getValueSchema();
    generator.writeStartObject();
    for (Map.Entry<Object, Object> entry : getMapEntries(map)) {
        generator.writeFieldName(entry.getKey().toString());
        writeValue(valueSchema, entry.getValue(), generator);
    }
    generator.writeEndObject();
}