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Lucene example source code file (data.txt)

This example Lucene source code file (data.txt) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

ausma, ausma, drama, drama, dramen, german, h, h, haus, hauses, this, tisch, tische, tische

The Lucene data.txt source code

# German special characters are replaced:
häufig	haufig

# here the stemmer works okay, it maps related words to the same stem:
abschließen	abschliess
abschließender	abschliess
abschließendes	abschliess
abschließenden	abschliess

Tisch	tisch
Tische	tisch
Tischen	tisch

Haus	hau
Hauses	hau
Häuser	hau
Häusern	hau
# here's a case where overstemming occurs, i.e. a word is 
# mapped to the same stem as unrelated words:
hauen	hau

# here's a case where understemming occurs, i.e. two related words
# are not mapped to the same stem. This is the case with basically
# all irregular forms:
Drama	drama
Dramen	dram

# replace "ß" with 'ss':
Ausmaß	ausmass

# fake words to test if suffixes are cut off:
xxxxxe	xxxxx
xxxxxs	xxxxx
xxxxxn	xxxxx
xxxxxt	xxxxx
xxxxxem	xxxxx
xxxxxer	xxxxx
xxxxxnd	xxxxx
# the suffixes are also removed when combined:
xxxxxetende	xxxxx

# words that are shorter than four charcters are not changed:
xxe	xxe
# -em and -er are not removed from words shorter than five characters:
xxem	xxem
xxer	xxer
# -nd is not removed from words shorter than six characters:
xxxnd	xxxnd

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene data.txt source code file:

my book on functional programming


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