org.apache.lucene.sandbox.queries.regex
Class JakartaRegexpCapabilities

java.lang.Object
  org.apache.lucene.sandbox.queries.regex.JakartaRegexpCapabilities

All Implemented Interfaces:

RegexCapabilities

public class JakartaRegexpCapabilities
extends Object
implements RegexCapabilities

Implementation tying Jakarta Regexp to RegexQuery. Jakarta Regexp internally supports a RegexCapabilities.RegexMatcher.prefix() implementation which can offer performance gains under certain circumstances. Yet, the implementation appears to be rather shaky as it doesn't always provide a prefix even if one would exist.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.lucene.sandbox.queries.regex.RegexCapabilities

RegexCapabilities.RegexMatcher

Field Summary

static int	FLAG_MATCH_CASEINDEPENDENT Flag to specify that matching should be case-independent (folded)
static int	FLAG_MATCH_NORMAL Flag to specify normal, case-sensitive matching behaviour.

Constructor Summary

JakartaRegexpCapabilities()
Constructs a RegexCapabilities with the default MATCH_NORMAL match style.

JakartaRegexpCapabilities(int flags)
Constructs a RegexCapabilities with the provided match flags.

Method Summary

RegexCapabilities.RegexMatcher	compile(String regex) Called by the constructor of RegexTermsEnum allowing implementations to cache a compiled version of the regular expression pattern.
boolean	equals(Object obj)
int	hashCode()

Methods inherited from class java.lang.Object

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

Field Detail

FLAG_MATCH_NORMAL

public static final int FLAG_MATCH_NORMAL

Flag to specify normal, case-sensitive matching behaviour. This is the default.

See Also:

Constant Field Values

FLAG_MATCH_CASEINDEPENDENT

public static final int FLAG_MATCH_CASEINDEPENDENT

Flag to specify that matching should be case-independent (folded)

See Also:

Constant Field Values

Constructor Detail

JakartaRegexpCapabilities

public JakartaRegexpCapabilities()

Constructs a RegexCapabilities with the default MATCH_NORMAL match style.

JakartaRegexpCapabilities

public JakartaRegexpCapabilities(int flags)

Constructs a RegexCapabilities with the provided match flags. Multiple flags should be ORed together.

Parameters:

flags - The matching style

Method Detail

compile

public RegexCapabilities.RegexMatcher compile(String regex)

Description copied from interface: RegexCapabilities

Called by the constructor of RegexTermsEnum allowing implementations to cache a compiled version of the regular expression pattern.

Specified by:

compile in interface RegexCapabilities

Parameters:

regex - regular expression pattern

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object