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A driver for DataStax Enterprise (DSE) and Apache Cassandra 1.2+ clusters that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol, supporting DSE-specific features such as geospatial types, DSE Graph and DSE authentication.

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/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.dse.graph;

import static com.fasterxml.jackson.core.JsonToken.END_ARRAY;
import static com.fasterxml.jackson.core.JsonToken.END_OBJECT;
import static com.fasterxml.jackson.core.JsonToken.FIELD_NAME;
import static com.fasterxml.jackson.core.JsonToken.START_ARRAY;
import static com.fasterxml.jackson.core.JsonToken.START_OBJECT;
import static com.fasterxml.jackson.core.JsonToken.VALUE_STRING;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.Set;

class DefaultPathDeserializer extends StdDeserializer {

  DefaultPathDeserializer() {
    super(DefaultPath.class);
  }

  @Override
  public DefaultPath deserialize(JsonParser parser, DeserializationContext ctx) throws IOException {
    assert parser.getCurrentToken() == START_OBJECT;
    DefaultPath path = new DefaultPath();
    while (parser.nextToken() != END_OBJECT) {
      assert parser.getCurrentToken() == FIELD_NAME;
      String name = parser.getCurrentName();
      parser.nextToken();
      if ("labels".equals(name)) {
        while (parser.nextToken() != END_ARRAY) {
          assert parser.getCurrentToken() == START_ARRAY;
          Set group = new LinkedHashSet();
          while (parser.nextToken() != END_ARRAY) {
            assert parser.getCurrentToken() == VALUE_STRING;
            String label = parser.readValueAs(String.class);
            group.add(label);
          }
          if (path.labels == null) path.labels = new ArrayList>();
          path.labels.add(group);
        }
      } else if ("objects".equals(name)) {
        assert parser.getCurrentToken() == START_ARRAY;
        while (parser.nextToken() != END_ARRAY) {
          assert parser.getCurrentToken() == START_OBJECT;
          JsonNode jacksonNode = parser.readValueAsTree();
          if (path.objects == null) path.objects = new ArrayList();
          path.objects.add(new DefaultGraphNode(jacksonNode, (ObjectMapper) parser.getCodec()));
        }
      } else {
        parser.skipChildren();
      }
    }
    return path;
  }
}