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.rel.type.RelDataTypeFactory;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.util.Util;
  
  import com.google.common.collect.ImmutableList;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  import static java.util.Objects.requireNonNull;
  
  /** Namespace based on a schema.
   *
   * <p>The visible names are tables and sub-schemas.
   */
  class SchemaNamespace extends AbstractNamespace {
    /** The path of this schema. */
    private final ImmutableList<String> names;
  
    /** Creates a SchemaNamespace. */
    SchemaNamespace(SqlValidatorImpl validator, List<String> names) {
      super(validator, null);
      this.names = ImmutableList.copyOf(names);
    }
  
    @Override protected RelDataType validateImpl(RelDataType targetRowType) {
      final RelDataTypeFactory.Builder builder =
          validator.getTypeFactory().builder();
      for (SqlMoniker moniker
          : validator.catalogReader.getAllSchemaObjectNames(names)) {
        final List<String> names1 = moniker.getFullyQualifiedNames();
        final SqlValidatorTable table =
            requireNonNull(validator.catalogReader.getTable(names1),
                () -> "table " + names1 + " is not found in scope " + names);
        builder.add(Util.last(names1), table.getRowType());
      }
      return builder.build();
    }
  
    @Override public @Nullable SqlNode getNode() {
      return null;
    }
  }
  