Examples of org.hibernate.ogm.util.parser.impl.LikeExpressionToRegExpConverter

Package org.hibernate.ogm.util.parser.impl

Examples of org.hibernate.ogm.util.parser.impl.LikeExpressionToRegExpConverter

org.hibernate.ogm.util.parser.impl.LikeExpressionToRegExpConverter
Creates {@link Pattern} objects equivalent to given HQL/JPQL {@code LIKE} expressions.
Used by {@link org.hibernate.ogm.datastore.mongodb.query.parsing.predicate.impl.MongoDBLikePredicate} to run {@code LIKE}queries against MongoDB, using the {@code $regex} operator.
The following rules apply for creating regular expressions:
- the {@code _} wildcard is replaced by {@code .} (unless it is escaped)
- the {@code %} wildcard is replaced by {@code .*} (unless it is escaped)
- non-wildcard character sequences are quoted (wrapped by {@code \\Q...\\E}) to match them as is
- escape characters are omitted from the resulting pattern
- the pattern is wrapped by {@code ^...$} to make sure the entire string is matched
- the reg exp wildcard {@code .} matches line breaks
@author Gunnar Morling

 */
public class LikeExpressionToRegExpConverterTest {


  @Test
  public void shouldCreateExpressions() {
    LikeExpressionToRegExpConverter converter = new LikeExpressionToRegExpConverter();


    assertThat( converter.getRegExpFromLikeExpression( "foo" ).pattern() ).isEqualTo( "^\\Qfoo\\E$" );
    assertThat( converter.getRegExpFromLikeExpression( "fo_o%bar" ).pattern() ).isEqualTo( "^\\Qfo\\E.\\Qo\\E.*\\Qbar\\E$" );
    assertThat( converter.getRegExpFromLikeExpression( "%foo%" ).pattern() ).isEqualTo( "^.*\\Qfoo\\E.*$" );
    assertThat( converter.getRegExpFromLikeExpression( "%foo[]%bar" ).pattern() ).isEqualTo( "^.*\\Qfoo[]\\E.*\\Qbar\\E$" );
  }

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    assertThat( converter.getRegExpFromLikeExpression( "%foo[]%bar" ).pattern() ).isEqualTo( "^.*\\Qfoo[]\\E.*\\Qbar\\E$" );
  }


  @Test
  public void shouldCreateExpressionsWithEscapeCharacter() {
    LikeExpressionToRegExpConverter converter = new LikeExpressionToRegExpConverter( '$' );


    assertThat( converter.getRegExpFromLikeExpression( "10$%" ).pattern() ).isEqualTo( "^\\Q10%\\E$" );
    assertThat( converter.getRegExpFromLikeExpression( "10$%, 20$%" ).pattern() ).isEqualTo( "^\\Q10%, 20%\\E$" );
    assertThat( converter.getRegExpFromLikeExpression( "10$%%20$%" ).pattern() ).isEqualTo( "^\\Q10%\\E.*\\Q20%\\E$" );
    assertThat( converter.getRegExpFromLikeExpression( "10$% (in $$)" ).pattern() ).isEqualTo( "^\\Q10% (in $)\\E$" );
  }

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  private final Pattern pattern;


  public MongoDBLikePredicate(String propertyName, String patternValue, Character escapeCharacter) {
    super( propertyName, patternValue, escapeCharacter );


    LikeExpressionToRegExpConverter converter = new LikeExpressionToRegExpConverter( escapeCharacter );
    pattern = converter.getRegExpFromLikeExpression( patternValue );
  }

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  public Neo4jLikePredicate(StringBuilder builder, String alias, String propertyName, String patternValue, Character escapeCharacter) {
    super( propertyName, patternValue, escapeCharacter );
    this.builder = builder;
    this.alias = alias;


    LikeExpressionToRegExpConverter converter = new LikeExpressionToRegExpConverter( escapeCharacter );
    regexp = converter.getRegExpFromLikeExpression( patternValue ).pattern();
  }

View Full Code Here

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Related Classes of org.hibernate.ogm.util.parser.impl.LikeExpressionToRegExpConverter

org.hibernate.ogm.datastore.mongodb.query.parsing.predicate.impl.MongoDBLikePredicate

org.hibernate.ogm.datastore.neo4j.query.parsing.impl.predicate.impl.Neo4jLikePredicate

org.hibernate.ogm.test.util.parser.impl.LikeExpressionToRegExpConverterTest

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