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.SqlIdentifier;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  /**
   * Implementation of
   * {@link org.apache.calcite.sql.validate.SqlValidatorCatalogReader} that passes
   * all calls to a parent catalog reader.
   */
  public abstract class DelegatingSqlValidatorCatalogReader
      implements SqlValidatorCatalogReader {
    protected final SqlValidatorCatalogReader catalogReader;
  
    /**
     * Creates a DelegatingSqlValidatorCatalogReader.
     *
     * @param catalogReader Parent catalog reader
     */
    protected DelegatingSqlValidatorCatalogReader(
        SqlValidatorCatalogReader catalogReader) {
      this.catalogReader = catalogReader;
    }
  
    @Override public @Nullable SqlValidatorTable getTable(List<String> names) {
      return catalogReader.getTable(names);
    }
  
    @Override public @Nullable RelDataType getNamedType(SqlIdentifier typeName) {
      return catalogReader.getNamedType(typeName);
    }
  
    @Override public List<SqlMoniker> getAllSchemaObjectNames(List<String> names) {
      return catalogReader.getAllSchemaObjectNames(names);
    }
  
    @Override public List<List<String>> getSchemaPaths() {
      return catalogReader.getSchemaPaths();
    }
  
    @Override public <C extends Object> @Nullable C unwrap(Class<C> aClass) {
      return catalogReader.unwrap(aClass);
    }
  }
  