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.sql.SqlNode;
  
  import com.google.common.collect.ImmutableList;
  
  import java.util.List;
  
  /**
   * Implementation of {@link SqlValidatorScope} that can see all schemas in the
   * current catalog.
   *
   * <p>Occurs near the root of the scope stack; its parent is typically
   * {@link EmptyScope}.
   *
   * <p>Helps resolve {@code schema.table.column} column references, such as
   *
   * <blockquote><pre>select sales.emp.empno from sales.emp</pre></blockquote>
   */
  class CatalogScope extends DelegatingScope {
    /** Fully-qualified name of the catalog. Typically empty or ["CATALOG"]. */
    final ImmutableList<String> names;
  
    //~ Constructors -----------------------------------------------------------
  
    CatalogScope(SqlValidatorScope parent, List<String> names) {
      super(parent);
      this.names = ImmutableList.copyOf(names);
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public SqlNode getNode() {
      throw new UnsupportedOperationException();
    }
  
  }
  