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.sql.validate;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.sql.SqlNode;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * Namespace representing the type of a dynamic parameter.
   *
   * @see ParameterScope
   */
  class ParameterNamespace extends AbstractNamespace {
    //~ Instance fields --------------------------------------------------------
  
    @SuppressWarnings("HidingField")
    private final RelDataType type;
  
    //~ Constructors -----------------------------------------------------------
  
    ParameterNamespace(SqlValidatorImpl validator, RelDataType type) {
      super(validator, null);
      this.type = type;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public @Nullable SqlNode getNode() {
      return null;
    }
  
    @Override public RelDataType validateImpl(RelDataType targetRowType) {
      return type;
    }
  
    @Override public RelDataType getRowType() {
      return type;
    }
  }
  