s2core/src/main/scala/org/apache/s2graph/core/storage/serde/vertex/wide/VertexDeserializable.scala

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 * distributed with this work for additional information
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 * 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
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package org.apache.s2graph.core.storage.serde.vertex.wide

import org.apache.s2graph.core.schema.ColumnMeta
import org.apache.s2graph.core.storage.CanSKeyValue
import org.apache.s2graph.core.storage.serde.Deserializable
import org.apache.s2graph.core.storage.serde.StorageDeserializable._
import org.apache.s2graph.core.types.{HBaseType, InnerVal, InnerValLike, VertexId}
import org.apache.s2graph.core.{S2Graph, S2GraphLike, S2Vertex, S2VertexLike}

import scala.collection.mutable.ListBuffer

class VertexDeserializable(graph: S2GraphLike,
                           bytesToInt: (Array[Byte], Int) => Int = bytesToInt) extends Deserializable[S2VertexLike] {
  val builder = graph.elementBuilder
  def fromKeyValues[T: CanSKeyValue](_kvs: Seq[T],
                                          cacheElementOpt: Option[S2VertexLike]): Option[S2VertexLike] = {
    try {
      val kvs = _kvs.map { kv => implicitly[CanSKeyValue[T]].toSKeyValue(kv) }
      val kv = kvs.head
      val version = HBaseType.DEFAULT_VERSION
      val (vertexId, _) = VertexId.fromBytes(kv.row, 0, kv.row.length, version)

      var maxTs = Long.MinValue
      val propsMap = new collection.mutable.HashMap[ColumnMeta, InnerValLike]
      val belongLabelIds = new ListBuffer[Int]

      for {
        kv <- kvs
      } {
        val propKey =
          if (kv.qualifier.length == 1) kv.qualifier.head.toInt
          else bytesToInt(kv.qualifier, 0)

        val ts = kv.timestamp
        if (ts > maxTs) maxTs = ts

        if (S2Vertex.isLabelId(propKey)) {
          belongLabelIds += S2Vertex.toLabelId(propKey)
        } else {
          val v = kv.value
          val (value, _) = InnerVal.fromBytes(v, 0, v.length, version)
          val columnMeta = vertexId.column.metasMap(propKey)
          propsMap += (columnMeta -> value)
        }
      }
      assert(maxTs != Long.MinValue)
      val vertex = builder.newVertex(vertexId, maxTs, S2Vertex.EmptyProps, belongLabelIds = belongLabelIds)
      S2Vertex.fillPropsWithTs(vertex, propsMap.toMap)

      Option(vertex)
    } catch {
      case e: Exception => None
    }
  }
}