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   * 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.
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  package org.apache.cassandra.constraints;
  
  import java.util.List;
  
  import org.junit.Test;
  
  import org.apache.cassandra.cql3.ColumnIdentifier;
  import org.apache.cassandra.cql3.Operator;
  import org.apache.cassandra.cql3.constraints.ColumnConstraints;
  import org.apache.cassandra.cql3.constraints.FunctionColumnConstraint.Raw;
  import org.apache.cassandra.cql3.constraints.InvalidConstraintDefinitionException;
  import org.apache.cassandra.cql3.constraints.RegexpConstraint;
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.db.marshal.AsciiType;
  import org.apache.cassandra.db.marshal.IntegerType;
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.schema.ColumnMetadata;
  import org.assertj.core.api.ThrowableAssert;
  
  import static java.util.List.of;
  import static org.apache.cassandra.schema.ColumnMetadata.Kind.REGULAR;
  import static org.assertj.core.api.Assertions.assertThatThrownBy;
  
  public class RegexpConstraintTest
  {
      private static final ColumnIdentifier columnIdentifier = new ColumnIdentifier("a_column", false);
      private static final ColumnIdentifier regexpFunctionIdentifier = new ColumnIdentifier(RegexpConstraint.FUNCTION_NAME, false);
      private static final ColumnMetadata regularStringColumn = getColumnOfType(UTF8Type.instance);
      private static final ColumnMetadata regularAsciiColumn = getColumnOfType(AsciiType.instance);
  
      private static final ColumnConstraints regexp = new ColumnConstraints(of(new Raw(regexpFunctionIdentifier, List.of(), Operator.EQ, "'a..b'").prepare()));
      private static final ColumnConstraints negatedRegexp = new ColumnConstraints(of(new Raw(regexpFunctionIdentifier, List.of(), Operator.NEQ, "'a..b'").prepare()));
  
      @Test
      public void testRegexpConstraint() throws Throwable
      {
          run(regexp, "acdb");
          run(regexp, "aaaaaaa", "Value does not match regular expression 'a..b'");
          run(negatedRegexp, "acdb", "Value does match regular expression 'a..b'");
          run(negatedRegexp, "aaaaa");
      }
  
      @Test
      public void testInvalidPattern()
      {
          ColumnConstraints invalid = new ColumnConstraints(of(new Raw(regexpFunctionIdentifier, List.of(), Operator.EQ, "'*abc'").prepare()));
          assertThatThrownBy(() -> invalid.validate(regularStringColumn))
          .hasMessage("String '*abc' is not a valid regular expression")
          .isInstanceOf(InvalidConstraintDefinitionException.class);
      }
  
      @Test
      public void testInvalidTypes()
      {
          assertThatThrownBy(() -> regexp.validate(getColumnOfType(IntegerType.instance)))
          .hasMessage("Constraint 'REGEXP' can be used only for columns of type " +
                      "[org.apache.cassandra.db.marshal.UTF8Type, org.apache.cassandra.db.marshal.AsciiType] " +
                      "but it was class org.apache.cassandra.db.marshal.IntegerType");
      }
  
      private void run(ColumnConstraints regexp, String input) throws Throwable
      {
          run(regexp, input, null);
      }
  
      private void run(ColumnConstraints regexp, String input, String exceptionMessage) throws Throwable
      {
          ThrowableAssert.ThrowingCallable callable = () ->
          {
              regexp.validate(regularStringColumn);
              regexp.evaluate(regularStringColumn.type, regularStringColumn.type.fromString(input));
  
              regexp.validate(regularAsciiColumn);
              regexp.evaluate(regularAsciiColumn.type, regularAsciiColumn.type.fromString(input));
          };
  
          if (exceptionMessage == null)
              callable.call();
          else
              assertThatThrownBy(callable).hasMessageContaining(exceptionMessage);
      }
  
      private static ColumnMetadata getColumnOfType(AbstractType<?> type)
      {
          return new ColumnMetadata("a", "b", columnIdentifier, type, ColumnMetadata.NO_UNIQUE_ID, -1, REGULAR, null);
      }
  }
  