com.atlassian.jira.issue.index.analyzer

Class WildcardFilter

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

com.atlassian.jira.issue.index.analyzer.WildcardFilter

All Implemented Interfaces:

Closeable, AutoCloseable

public class WildcardFilter
extends org.apache.lucene.analysis.TokenFilter

This Filter adds wildcards to the tokens returned by standard filters.

It can be difficult to do wild card search over a stemmed index - for example 'feature' will be stemmed to feature and if you search for 'feature*' you will not match 'feature'. To search for 'feature*' then stem first and then wildcard.

The need for this was highlighted by (JRA-19918)

This filter stems and then appends the wildcard to each existing token, so it makes no sense for it not to be the final filter in the chain. note that the query returned will actually not work (it will look for the litral * as it is a term query - use the query to get the text and then search)

Since:

v4.3

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource

org.apache.lucene.util.AttributeSource.AttributeFactory, org.apache.lucene.util.AttributeSource.State

Field Summary

Fields

Modifier and Type	Field and Description
static char	WILDCARD_OPERATOR Wildcrad character: U+002A (ASTERISK)

Fields inherited from class org.apache.lucene.analysis.TokenFilter

input

Constructor Summary

Constructors

Constructor and Description
WildcardFilter(org.apache.lucene.analysis.TokenStream in)

Method Summary

Modifier and Type	Method and Description
boolean	incrementToken()

Methods inherited from class org.apache.lucene.analysis.TokenFilter

close, end, reset

Methods inherited from class org.apache.lucene.util.AttributeSource

addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState, toString

Methods inherited from class java.lang.Object

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

Field Detail

WILDCARD_OPERATOR

public static final char WILDCARD_OPERATOR

Wildcrad character: U+002A (ASTERISK)

See Also:

Constant Field Values

Constructor Detail

WildcardFilter

public WildcardFilter(org.apache.lucene.analysis.TokenStream in)

Method Detail

incrementToken

public final boolean incrementToken()
                             throws IOException

Specified by:

incrementToken in class org.apache.lucene.analysis.TokenStream

Throws:

IOException