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.schema.impl;
  
  import org.apache.calcite.linq4j.tree.Expression;
  import org.apache.calcite.rel.type.RelProtoDataType;
  import org.apache.calcite.schema.Function;
  import org.apache.calcite.schema.Schema;
  import org.apache.calcite.schema.SchemaPlus;
  import org.apache.calcite.schema.SchemaVersion;
  import org.apache.calcite.schema.Table;
  import org.apache.calcite.schema.lookup.LikePattern;
  import org.apache.calcite.schema.lookup.Lookup;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.Collection;
  import java.util.Set;
  
  /**
   * Implementation of {@link org.apache.calcite.schema.Schema} that delegates to
   * an underlying schema.
   */
  public class DelegatingSchema implements Schema {
    protected final Schema schema;
  
    /**
     * Creates a DelegatingSchema.
     *
     * @param schema Underlying schema
     */
    public DelegatingSchema(Schema schema) {
      this.schema = schema;
    }
  
    @Override public String toString() {
      return "DelegatingSchema(delegate=" + schema + ")";
    }
  
    @Override public boolean isMutable() {
      return schema.isMutable();
    }
  
    @Override public Schema snapshot(SchemaVersion version) {
      return schema.snapshot(version);
    }
  
    @Override public Expression getExpression(@Nullable SchemaPlus parentSchema, String name) {
      return schema.getExpression(parentSchema, name);
    }
  
    @Override public Lookup<Table> tables() {
      return schema.tables();
    }
  
    @Deprecated @Override public @Nullable Table getTable(String name) {
      return schema.tables().get(name);
    }
  
    @Deprecated @Override public Set<String> getTableNames() {
      return schema.tables().getNames(LikePattern.any());
    }
  
    @Override public @Nullable RelProtoDataType getType(String name) {
      return schema.getType(name);
    }
  
    @Override public Set<String> getTypeNames() {
      return schema.getTypeNames();
    }
  
    @Override public Collection<Function> getFunctions(String name) {
      return schema.getFunctions(name);
    }
  
    @Override public Set<String> getFunctionNames() {
      return schema.getFunctionNames();
    }
  
    @Override public Lookup<? extends Schema> subSchemas() {
      return schema.subSchemas();
    }
  
    @Deprecated @Override public @Nullable Schema getSubSchema(String name) {
      return subSchemas().get(name);
    }
  
    @Deprecated @Override public Set<String> getSubSchemaNames() {
      return subSchemas().getNames(LikePattern.any());
    }
  }
  