contrib/storage-hbase/src/test/java/org/apache/drill/hbase/TestHBaseRegexParser.java

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 * distributed with this work for additional information
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 * 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
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package org.apache.drill.hbase;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.util.regex.Pattern;

import org.apache.drill.categories.HbaseStorageTest;
import org.apache.drill.categories.SlowTest;
import org.apache.drill.exec.store.hbase.HBaseRegexParser;
import org.apache.drill.test.DrillTest;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category({SlowTest.class, HbaseStorageTest.class})
public class TestHBaseRegexParser extends DrillTest {

  @Test
  public void testLikeExprToRegex() throws Exception {
    HBaseRegexParser parser = new HBaseRegexParser("ABC%[0-7][0-9A-Fa-f]").parse();
    assertEquals("^\\QABC\\E.*[0-7][0-9A-Fa-f]$", parser.getRegexString());
    assertEquals("ABC", parser.getPrefixString());
    Pattern pattern = Pattern.compile(parser.getRegexString(), Pattern.DOTALL);
    assertTrue(pattern.matcher("ABC79").matches());
    assertTrue(pattern.matcher("ABCxxxxxxx79").matches());

    parser = new HBaseRegexParser("ABC%[0-8]%_").parse();
    assertEquals("^\\QABC\\E.*[0-8].*.$", parser.getRegexString());
    assertEquals("ABC", parser.getPrefixString());
    pattern = Pattern.compile(parser.getRegexString(), Pattern.DOTALL);
    assertTrue(pattern.matcher("ABC79").matches());
    assertTrue(pattern.matcher("ABCxxxx79").matches());
    assertTrue(pattern.matcher("ABCxxxx7xxxxx9").matches());
    assertTrue(pattern.matcher("ABC[0-8]_").matches());

    parser = new HBaseRegexParser("ABC%[0-8]%_", '%').parse();
    assertEquals("^\\QABC\\E\\Q[\\E\\Q0-8]\\E\\Q_\\E$", parser.getRegexString());
    assertEquals("ABC[0-8]_", parser.getPrefixString());
    pattern = Pattern.compile(parser.getRegexString(), Pattern.DOTALL);
    assertFalse(pattern.matcher("ABC79").matches());
    assertTrue(pattern.matcher("ABC[0-8]_").matches());

    try {
      parser = new HBaseRegexParser("ABC%[0-8][^a-f]%", '%').parse();
      fail("Parsed an illegal LIKE expression.");
    } catch (IllegalArgumentException e) {
    }
  }

}