flink-libraries/flink-table/src/main/scala/org/apache/flink/table/dataview/MapViewTypeInfoFactory.scala

/*
 * 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.flink.table.dataview

import java.lang.reflect.Type
import java.util

import org.apache.flink.api.common.typeinfo.{TypeInfoFactory, TypeInformation}
import org.apache.flink.api.java.typeutils.GenericTypeInfo
import org.apache.flink.table.api.dataview.MapView

class MapViewTypeInfoFactory[K, V] extends TypeInfoFactory[MapView[K, V]] {

  override def createTypeInfo(
      t: Type,
      genericParameters: util.Map[String, TypeInformation[_]]): TypeInformation[MapView[K, V]] = {

    var keyType = genericParameters.get("K")
    var valueType = genericParameters.get("V")

    if (keyType == null) {
      // we might can get the keyType later from the MapView constructor
      keyType = new GenericTypeInfo(classOf[Any])
    }

    if (valueType == null) {
      // we might can get the valueType later from the MapView constructor
      valueType = new GenericTypeInfo(classOf[Any])
    }

    new MapViewTypeInfo[K, V](
      keyType.asInstanceOf[TypeInformation[K]],
      valueType.asInstanceOf[TypeInformation[V]])
  }
}