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.RelDataTypeField;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.util.Pair;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  /**
   * An implementation of {@link SqlValidatorNamespace} that delegates all methods
   * to an underlying object.
   */
  public abstract class DelegatingNamespace implements SqlValidatorNamespace {
    //~ Instance fields --------------------------------------------------------
  
    protected final SqlValidatorNamespace namespace;
  
    //~ Constructors -----------------------------------------------------------
  
    /**
     * Creates a DelegatingNamespace.
     *
     * @param namespace Underlying namespace, to delegate to
     */
    protected DelegatingNamespace(SqlValidatorNamespace namespace) {
      this.namespace = namespace;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public SqlValidator getValidator() {
      return namespace.getValidator();
    }
  
    @Override public @Nullable SqlValidatorTable getTable() {
      return namespace.getTable();
    }
  
    @Override public RelDataType getRowType() {
      return namespace.getRowType();
    }
  
    @Override public void setType(RelDataType type) {
      namespace.setType(type);
    }
  
    @Override public RelDataType getRowTypeSansSystemColumns() {
      return namespace.getRowTypeSansSystemColumns();
    }
  
    @Override public RelDataType getType() {
      return namespace.getType();
    }
  
    @Override public void validate(RelDataType targetRowType) {
      namespace.validate(targetRowType);
    }
  
    @Override public @Nullable SqlNode getNode() {
      return namespace.getNode();
    }
  
    @Override public @Nullable SqlNode getEnclosingNode() {
      return namespace.getEnclosingNode();
    }
  
    @Override public @Nullable SqlValidatorNamespace lookupChild(
        String name) {
      return namespace.lookupChild(name);
    }
  
    @Override public @Nullable RelDataTypeField field(String name) {
      return namespace.field(name);
    }
  
    @Override public List<Pair<SqlNode, SqlMonotonicity>> getMonotonicExprs() {
      return namespace.getMonotonicExprs();
    }
  
    @Override public SqlMonotonicity getMonotonicity(String columnName) {
      return namespace.getMonotonicity(columnName);
    }
  
    @SuppressWarnings("deprecation")
    @Override public void makeNullable() {
    }
  
    @Override public <T> T unwrap(Class<T> clazz) {
      if (clazz.isInstance(this)) {
        return clazz.cast(this);
      } else {
        return namespace.unwrap(clazz);
      }
    }
  
    @Override public boolean isWrapperFor(Class<?> clazz) {
      return clazz.isInstance(this)
          || namespace.isWrapperFor(clazz);
    }
  }
  