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.nio.ByteBuffer;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.cassandra.cql3.Operator;
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.schema.ColumnMetadata;
  
  import static java.lang.String.format;
  
  public class NotNullConstraint extends UnaryConstraintFunction
  {
      public static final String FUNCTION_NAME = "NOT_NULL"; // as enum item
      public static final String CQL_FUNCTION_NAME = "NOT NULL";
  
      private static final List<String> emptyArguments = Collections.emptyList();
  
      public NotNullConstraint()
      {
          super(FUNCTION_NAME, emptyArguments);
      }
  
      public NotNullConstraint(List<String> args)
      {
          super(FUNCTION_NAME, args);
      }
  
      @Override
      public void internalEvaluate(AbstractType<?> valueType, Operator relationType, String term, ByteBuffer columnValue)
      {
          // on purpose empty as evaluate method already covered nullity
      }
  
      @Override
      public void validate(ColumnMetadata columnMetadata, String term) throws InvalidConstraintDefinitionException
      {
          super.validate(columnMetadata, term);
          if (columnMetadata.isPrimaryKeyColumn())
              throw new InvalidConstraintDefinitionException(format("%s constraint can not be specified on a %s key column '%s'",
                                                                    name,
                                                                    columnMetadata.isPartitionKey() ? "partition" : "clustering",
                                                                    columnMetadata.name));
      }
  
      @Override
      public List<AbstractType<?>> getSupportedTypes()
      {
          return null;
      }
  
      @Override
      public String toString()
      {
          return CQL_FUNCTION_NAME;
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o)
              return true;
  
          if (!(o instanceof NotNullConstraint))
              return false;
  
          NotNullConstraint other = (NotNullConstraint) o;
  
          return columnName.equals(other.columnName) && name.equals(other.name);
      }
  }
  