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.calcite.server;
  
  import org.apache.calcite.materialize.MaterializationKey;
  import org.apache.calcite.rel.type.RelProtoDataType;
  import org.apache.calcite.schema.Schema;
  import org.apache.calcite.sql2rel.NullInitializerExpressionFactory;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** A table that implements a materialized view. */
  class MaterializedViewTable
      extends MutableArrayTable {
    /** The key with which this was stored in the materialization service,
     * or null if not (yet) materialized. */
    @Nullable MaterializationKey key;
  
    MaterializedViewTable(String name, RelProtoDataType protoRowType) {
      super(name, protoRowType, protoRowType,
          NullInitializerExpressionFactory.INSTANCE);
    }
  
    @Override public Schema.TableType getJdbcTableType() {
      return Schema.TableType.MATERIALIZED_VIEW;
    }
  
    @Override public <C extends Object> @Nullable C unwrap(Class<C> aClass) {
      if (MaterializationKey.class.isAssignableFrom(aClass)
          && aClass.isInstance(key)) {
        return aClass.cast(key);
      }
      return super.unwrap(aClass);
    }
  }
  