code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  package org.apache.skywalking.oap.query.promql.entity.codec;
  
  import com.fasterxml.jackson.core.JsonGenerator;
  import com.fasterxml.jackson.core.io.SerializedString;
  import com.fasterxml.jackson.databind.JsonSerializer;
  import com.fasterxml.jackson.databind.SerializerProvider;
  import java.io.IOException;
  import org.apache.skywalking.oap.query.promql.entity.LabelValuePair;
  import org.apache.skywalking.oap.query.promql.entity.MetricInfo;
  
  public class MetricInfoSerializer extends JsonSerializer<MetricInfo> {
      @Override
      public void serialize(final MetricInfo value,
                            final JsonGenerator gen,
                            final SerializerProvider serializers) throws IOException {
          gen.setRootValueSeparator(new SerializedString("\n"));
          gen.writeStartObject();
          {
              gen.writeStringField("__name__", value.getName());
              for (LabelValuePair label: value.getLabels()) {
                  gen.writeStringField(label.getLabelName().getLabel(), label.getLabelValue());
              }
          }
          gen.writeEndObject();
      }
  }
  