Package org.elasticsearch.xpack.esql.core.expression.predicate.regex

Class AbstractStringPattern

java.lang.Object

org.elasticsearch.xpack.esql.core.expression.predicate.regex.AbstractStringPattern

All Implemented Interfaces:

StringPattern

Direct Known Subclasses:

RLikePattern, RLikePatternList, WildcardPattern, WildcardPatternList

public abstract class AbstractStringPattern
extends Object
implements StringPattern

Constructor Summary

Constructors

Constructor	Description
AbstractStringPattern()

Method Summary

Modifier and Type	Method	Description
final org.apache.lucene.util.automaton.Automaton	createAutomaton(boolean ignoreCase)
protected abstract org.apache.lucene.util.automaton.Automaton	doCreateAutomaton(boolean ignoreCase)
String	exactMatch()	Returns the match if this pattern is exact, that is has no wildcard or other patterns inside.
String	extractPrefix()	Returns the longest string that prefixes every string accepted by this pattern, using Lucene's Operations.getCommonPrefix(org.apache.lucene.util.automaton.Automaton).
String	extractSuffix()	Returns the longest string that suffixes every string accepted by this pattern.
boolean	matchesAll()	Hint method on whether this pattern matches everything or not.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.elasticsearch.xpack.esql.core.expression.predicate.regex.StringPattern

asJavaRegex, pattern

Constructor Details

AbstractStringPattern

public AbstractStringPattern()

Method Details

createAutomaton

public final org.apache.lucene.util.automaton.Automaton createAutomaton(boolean ignoreCase)

doCreateAutomaton

protected abstract org.apache.lucene.util.automaton.Automaton doCreateAutomaton(boolean ignoreCase)

matchesAll

public boolean matchesAll()

Description copied from interface: StringPattern

Hint method on whether this pattern matches everything or not.

Specified by:

matchesAll in interface StringPattern

exactMatch

public String exactMatch()

Description copied from interface: StringPattern

Returns the match if this pattern is exact, that is has no wildcard or other patterns inside. If the pattern is not exact, null is returned.

Specified by:

exactMatch in interface StringPattern

extractPrefix

public String extractPrefix()

Returns the longest string that prefixes every string accepted by this pattern, using Lucene's Operations.getCommonPrefix(org.apache.lucene.util.automaton.Automaton). Returns null if the common prefix is empty (e.g. the pattern starts with a wildcard).

extractSuffix

public String extractSuffix()

Returns the longest string that suffixes every string accepted by this pattern. Computed by reversing the automaton and extracting the common prefix of the reversed language, then reversing the result. Returns null if the common suffix is empty or the reversed automaton is too complex to determinize.