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.constraints;
  
  import java.util.List;
  import java.util.Optional;
  
  import org.apache.cassandra.cql3.constraints.ColumnConstraint;
  import org.apache.cassandra.cql3.constraints.ConstraintFunction;
  import org.apache.cassandra.cql3.constraints.ConstraintProvider;
  import org.apache.cassandra.cql3.constraints.ConstraintResolver;
  import org.apache.cassandra.cql3.constraints.InvalidConstraintDefinitionException;
  import org.apache.cassandra.cql3.constraints.JsonConstraint;
  import org.apache.cassandra.cql3.constraints.LengthConstraint;
  import org.apache.cassandra.cql3.constraints.SatisfiabilityChecker;
  import org.apache.cassandra.cql3.constraints.SatisfiabilityChecker.UnaryFunctionSatisfiabilityChecker;
  import org.apache.cassandra.cql3.constraints.UnaryConstraintFunction;
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.schema.ColumnMetadata;
  
  import static org.apache.cassandra.cql3.constraints.AbstractFunctionSatisfiabilityChecker.FUNCTION_SATISFIABILITY_CHECKER;
  import static org.apache.cassandra.cql3.constraints.ConstraintResolver.getConstraintFunction;
  import static org.apache.cassandra.cql3.constraints.ConstraintResolver.getUnaryConstraintFunction;
  
  public class CustomConstraintsProvider implements ConstraintProvider
  {
      @Override
      public Optional<UnaryConstraintFunction> getUnaryConstraint(String functionName, List<String> arguments)
      {
          if (!functionName.equalsIgnoreCase(MyCustomUnaryConstraint.NAME))
              return Optional.empty();
  
          return Optional.of(new MyCustomUnaryConstraint(arguments));
      }
  
      @Override
      public Optional<ConstraintFunction> getConstraintFunction(String functionName, List<String> arguments)
      {
          if (!functionName.equalsIgnoreCase(MyCustomConstraint.NAME))
              return Optional.empty();
  
          return Optional.of(new MyCustomConstraint(arguments));
      }
  
      @Override
      public List<? extends SatisfiabilityChecker> getUnaryConstraintSatisfiabilityCheckers()
      {
          return List.of(new MyCustomUnaryConstraint(List.of()));
      }
  
      @Override
      public List<? extends SatisfiabilityChecker> getConstraintFunctionSatisfiabilityCheckers()
      {
          return List.of((constraints, columnMetadata) ->
                         FUNCTION_SATISFIABILITY_CHECKER.check(MyCustomConstraint.NAME,
                                                               constraints,
                                                               columnMetadata));
      }
  
      /**
       * Same as length constraint, just under different name to prove the point
       */
      public static class MyCustomConstraint extends LengthConstraint
      {
          public static final String NAME = "MY_CUSTOM_CONSTRAINT";
  
          public MyCustomConstraint(List<String> arguments)
          {
              super(NAME, arguments);
          }
      }
  
      /**
       * Same as JSON constraint, just under different name to prove the point
       */
      public static class MyCustomUnaryConstraint extends JsonConstraint
      {
          public static final String NAME = "MY_CUSTOM_UNARY_CONSTRAINT";
  
          public MyCustomUnaryConstraint(List<String> arguments)
          {
              super(NAME, arguments);
          }
      }
  }