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.cassandra.cql3.selection;
  
  import java.util.List;
  import java.util.function.Predicate;
  
  import org.apache.cassandra.cql3.ColumnIdentifier;
  import org.apache.cassandra.cql3.ColumnSpecification;
  import org.apache.cassandra.cql3.VariableSpecifications;
  import org.apache.cassandra.cql3.selection.Selector.Factory;
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.schema.ColumnMetadata;
  import org.apache.cassandra.schema.TableMetadata;
  
  /**
   * A {@code Selectable} with an alias.
   */
  final class AliasedSelectable implements Selectable
  {
      /**
       * The selectable
       */
      private final Selectable selectable;
  
      /**
       * The alias associated to the selectable.
       */
      private final ColumnIdentifier alias;
  
      public AliasedSelectable(Selectable selectable, ColumnIdentifier alias)
      {
          this.selectable = selectable;
          this.alias = alias;
      }
  
      @Override
      public TestResult testAssignment(String keyspace, ColumnSpecification receiver)
      {
          return selectable.testAssignment(keyspace, receiver);
      }
  
      @Override
      public Factory newSelectorFactory(TableMetadata table,
                                        AbstractType<?> expectedType,
                                        List<ColumnMetadata> defs,
                                        VariableSpecifications boundNames)
      {
          final Factory delegate = selectable.newSelectorFactory(table, expectedType, defs, boundNames);
          final ColumnSpecification columnSpec = delegate.getColumnSpecification(table).withAlias(alias);
  
          return new ForwardingFactory()
          {
              @Override
              protected Factory delegate()
              {
                  return delegate;
              }
  
              @Override
              public ColumnSpecification getColumnSpecification(TableMetadata table)
              {
                  return columnSpec;
              }
          };
      }
  
      @Override
      public AbstractType<?> getExactTypeIfKnown(String keyspace)
      {
          return selectable.getExactTypeIfKnown(keyspace);
      }
  
      @Override
      public boolean selectColumns(Predicate<ColumnMetadata> predicate)
      {
          return selectable.selectColumns(predicate);
      }
  }
  