content: /*
   * 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.beam.examples.complete.cdap.hubspot.utils;
  
  import static org.apache.beam.sdk.util.Preconditions.checkArgumentNotNull;
  
  import com.google.gson.Gson;
  import io.cdap.plugin.hubspot.source.streaming.HubspotStreamingSource;
  import java.util.HashMap;
  import org.apache.beam.sdk.io.cdap.Plugin;
  import org.apache.beam.sdk.transforms.SerializableFunction;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.reflect.TypeToken;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Class for getting a {@link SerializableFunction} that defines how to get record offset for
   * different CDAP {@link Plugin} classes.
   */
  public class GetOffsetUtils {
  
    private static final Logger LOG = LoggerFactory.getLogger(GetOffsetUtils.class);
    private static final Gson GSON = new Gson();
  
    private static final String HUBSPOT_ID_FIELD = "vid";
  
    /**
     * Function for getting offset for given streaming Cdap {@link
     * io.cdap.cdap.api.annotation.Plugin}.
     */
    public static SerializableFunction<String, Long> getOffsetFnForCdapPlugin(Class<?> pluginClass) {
      if (HubspotStreamingSource.class.equals(pluginClass)) {
        return getOffsetFnForHubspot();
      }
      throw new UnsupportedOperationException(
          String.format("Given plugin class '%s' is not supported!", pluginClass.getName()));
    }
  
    /**
     * Function for getting offset for Hubspot record that has {@link #HUBSPOT_ID_FIELD} number field.
     */
    private static SerializableFunction<String, Long> getOffsetFnForHubspot() {
      return input -> {
        if (input != null) {
          try {
            HashMap<String, Object> json =
                GSON.fromJson(input, new TypeToken<HashMap<String, Object>>() {}.getType());
            checkArgumentNotNull(json, "Can not get JSON from Hubspot input string");
            Object id = json.get(HUBSPOT_ID_FIELD);
            checkArgumentNotNull(id, "Can not get ID from Hubspot input string");
            return ((Double) id).longValue();
          } catch (Exception e) {
            LOG.error("Can not get offset from json", e);
          }
        }
        return 0L;
      };
    }
  }
  