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.Collection;
  
  import com.google.common.collect.HashMultimap;
  import com.google.common.collect.Multimap;
  
  import org.apache.cassandra.cql3.functions.masking.MaskingFcts;
  
  /**
   * A container of native functions. It stores both pre-built function overloads ({@link NativeFunction}) and
   * dynamic generators of functions ({@link FunctionFactory}).
   */
  public class NativeFunctions
  {
      public static NativeFunctions instance = new NativeFunctions()
      {
          {
              TokenFct.addFunctionsTo(this);
              CastFcts.addFunctionsTo(this);
              UuidFcts.addFunctionsTo(this);
              TimeFcts.addFunctionsTo(this);
              ToJsonFct.addFunctionsTo(this);
              FromJsonFct.addFunctionsTo(this);
              OperationFcts.addFunctionsTo(this);
              AggregateFcts.addFunctionsTo(this);
              CollectionFcts.addFunctionsTo(this);
              BytesConversionFcts.addFunctionsTo(this);
              LengthFcts.addFunctionsTo(this);
              MathFcts.addFunctionsTo(this);
              MaskingFcts.addFunctionsTo(this);
              VectorFcts.addFunctionsTo(this);
              ClusterMetadataFcts.addFunctionsTo(this);
              FormatFcts.addFunctionsTo(this);
          }
      };
  
      /** Pre-built function overloads. */
      private final Multimap<FunctionName, NativeFunction> functions = HashMultimap.create();
  
      /** Dynamic function factories. */
      private final Multimap<FunctionName, FunctionFactory> factories = HashMultimap.create();
  
      public void add(NativeFunction function)
      {
          functions.put(function.name(), function);
          NativeFunction legacyFunction = function.withLegacyName();
          if (legacyFunction != null)
              functions.put(legacyFunction.name(), legacyFunction);
      }
  
      public void addAll(NativeFunction... functions)
      {
          for (NativeFunction function : functions)
              add(function);
      }
  
      public void add(FunctionFactory factory)
      {
          factories.put(factory.name(), factory);
      }
  
      /**
       * Returns all the registered pre-built functions overloads with the specified name.
       *
       * @param name a function name
       * @return the pre-built functions with the specified name
       */
      public Collection<NativeFunction> getFunctions(FunctionName name)
      {
          return functions.get(name);
      }
  
      /**
       * @return all the registered pre-built functions.
       */
      public Collection<NativeFunction> getFunctions()
      {
          return functions.values();
      }
  
      /**
       * Returns all the registered functions factories with the specified name.
       *
       * @param name a function name
       * @return the function factories with the specified name
       */
      public Collection<FunctionFactory> getFactories(FunctionName name)
      {
          return factories.get(name);
      }
  
      /**
       * @return all the registered functions factories.
       */
      public Collection<FunctionFactory> getFactories()
      {
          return factories.values();
      }
  
      /**
       * Returns whether there is a function factory with the specified name.
       *
       * @param name a function name
       * @return {@code true} if there is a factory with the specified name, {@code false} otherwise
       */
      public boolean hasFactory(FunctionName name)
      {
          return factories.containsKey(name);
      }
  }
  