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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.repository.graphdb.janus.migration;
  
  import org.apache.atlas.repository.Constants;
  import org.apache.tinkerpop.gremlin.structure.Element;
  import org.apache.tinkerpop.gremlin.structure.Graph;
  import org.apache.tinkerpop.shaded.jackson.databind.JsonNode;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Map;
  import java.util.NoSuchElementException;
  
  import static org.apache.atlas.repository.Constants.EDGE_ID_IN_IMPORT_KEY;
  import static org.apache.atlas.repository.Constants.VERTEX_ID_IN_IMPORT_KEY;
  
  public class JsonNodeParsers {
      private static final Logger LOG = LoggerFactory.getLogger(JsonNodeParsers.class);
  
      abstract static class ParseElement {
          protected GraphSONUtility utility;
  
          public void setContext(GraphSONUtility utility) {
              this.utility = utility;
          }
  
          public void commit(Graph graph) {
              graph.tx().commit();
          }
  
          public Element getByOriginalId(Graph gr, JsonNode node) {
              return getByOriginalId(gr, getId(node));
          }
  
          public Element update(Graph gr, Object id, Map<String, Object> schema) {
              Element el = get(gr, id);
  
              for (Map.Entry<String, Object> entry : schema.entrySet()) {
                  el.property(entry.getKey(), entry.getValue());
              }
  
              return el;
          }
  
          abstract String getMessage();
  
          abstract Object getId(JsonNode node);
  
          abstract boolean isTypeNode(JsonNode node);
  
          abstract String getType(JsonNode node);
  
          abstract Map<String, Object> parse(Graph gr, MappedElementCache cache, JsonNode node);
  
          abstract Element get(Graph gr, Object id);
  
          abstract Element getByOriginalId(Graph gr, Object id);
      }
  
      static class ParseEdge extends ParseElement {
          private static final String MESSAGE_EDGE = "edge";
  
          @Override
          public String getMessage() {
              return MESSAGE_EDGE;
          }
  
          @Override
          Object getId(JsonNode node) {
              return GraphSONUtility.getTypedValueFromJsonNode(node.get(GraphSONTokensTP2._ID));
          }
  
          @Override
          public boolean isTypeNode(JsonNode node) {
              return node.get(GraphSONTokensTP2._LABEL).textValue().startsWith(Constants.TYPENAME_PROPERTY_KEY);
          }
  
          @Override
          public String getType(JsonNode node) {
              return node.get(GraphSONTokensTP2._LABEL).textValue();
          }
  
          @Override
          public Map<String, Object> parse(Graph gr, MappedElementCache cache, JsonNode node) {
              return utility.edgeFromJson(gr, cache, node);
          }
  
          @Override
          Element get(Graph gr, Object id) {
              return gr.edges(id).next();
          }
  
          @Override
          Element getByOriginalId(Graph gr, Object id) {
              try {
                  return gr.traversal().E().has(EDGE_ID_IN_IMPORT_KEY, id).next();
              } catch (NoSuchElementException ex) {
                  if (LOG.isDebugEnabled()) {
                      LOG.debug("getByOriginalId: {}: failed: {}", getMessage(), id, ex);
                  }
              } catch (Exception ex) {
                  LOG.error("getByOriginalId: {}: failed: {}", getMessage(), id, ex);
              }
  
              return null;
          }
      }
  
      static class ParseVertex extends ParseElement {
          private static final String NODE_VALUE_KEY = "value";
          private static final String MESSAGE_VERTEX = "vertex";
  
          @Override
          public String getMessage() {
              return MESSAGE_VERTEX;
          }
  
          @Override
          Object getId(JsonNode node) {
              return GraphSONUtility.getTypedValueFromJsonNode(node.get(GraphSONTokensTP2._ID));
          }
  
          @Override
          public boolean isTypeNode(JsonNode node) {
              return node.has(Constants.TYPENAME_PROPERTY_KEY);
          }
  
          @Override
          public String getType(JsonNode node) {
              return node.has(Constants.ENTITY_TYPE_PROPERTY_KEY) ? node.get(Constants.ENTITY_TYPE_PROPERTY_KEY).get(NODE_VALUE_KEY).toString() : "";
          }
  
          @Override
          public Map<String, Object> parse(Graph graph, MappedElementCache cache, JsonNode node) {
              return utility.vertexFromJson(graph, node);
          }
  
          @Override
          Element get(Graph gr, Object id) {
              return gr.vertices(id).next();
          }
  
          @Override
          Element getByOriginalId(Graph gr, Object id) {
              try {
                  return gr.traversal().V().has(VERTEX_ID_IN_IMPORT_KEY, id).next();
              } catch (NoSuchElementException ex) {
                  if (LOG.isDebugEnabled()) {
                      LOG.debug("getByOriginalId: {}: failed: {}", getMessage(), id, ex);
                  }
              } catch (Exception ex) {
                  LOG.error("getByOriginalId: {}: failed: {}", getMessage(), id, ex);
              }
  
              return null;
          }
      }
  }
  