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.functions;
  
  import java.util.Arrays;
  
  import javax.annotation.Nullable;
  
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.transport.ProtocolVersion;
  
  /**
   * Base class for our native/hardcoded functions.
   */
  public abstract class NativeFunction extends AbstractFunction
  {
      protected NativeFunction(String name, AbstractType<?> returnType, AbstractType<?>... argTypes)
      {
          super(FunctionName.nativeFunction(name), Arrays.asList(argTypes), returnType);
      }
  
      @Override
      public final boolean isNative()
      {
          return true;
      }
  
      @Override
      public boolean isPure()
      {
          // Most of our functions are pure, the other ones should override this
          return true;
      }
  
      /**
       * Returns a copy of this function using its old pre-5.0 name before the adoption of snake-cased function names.
       * Those naming conventions were adopted in 5.0, but we still need to support the old names for
       * compatibility. See CASSANDRA-18037 for further details.
       *
       * @return a copy of this function using its old pre-5.0 deprecated name, or {@code null} if the pre-5.0 function
       * name already satisfied the naming conventions.
       */
      @Nullable
      public NativeFunction withLegacyName()
      {
          return null;
      }
  
      @Override
      public Arguments newArguments(ProtocolVersion version)
      {
          return FunctionArguments.newInstanceForNativeFunction(version, argTypes);
      }
  
  }
  