org.apache.lucene.analysis.compound

Class DictionaryCompoundWordTokenFilter

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

org.apache.lucene.analysis.compound.CompoundWordTokenFilterBase

org.apache.lucene.analysis.compound.DictionaryCompoundWordTokenFilter

All Implemented Interfaces:

Closeable

public class DictionaryCompoundWordTokenFilter
extends CompoundWordTokenFilterBase

A TokenFilter that decomposes compound words found in many Germanic languages.

"Donaudampfschiff" becomes Donau, dampf, schiff so that you can find "Donaudampfschiff" even when you only enter "schiff". It uses a brute-force algorithm to achieve this.

You must specify the required Version compatibility when creating CompoundWordTokenFilterBase:

• As of 3.1, CompoundWordTokenFilterBase correctly handles Unicode 4.0 supplementary characters in strings and char arrays provided as compound word dictionaries.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.analysis.compound.CompoundWordTokenFilterBase

CompoundWordTokenFilterBase.CompoundToken

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

AttributeSource.AttributeFactory, AttributeSource.State

Field Summary

Fields inherited from class org.apache.lucene.analysis.compound.CompoundWordTokenFilterBase

DEFAULT_MAX_SUBWORD_SIZE, DEFAULT_MIN_SUBWORD_SIZE, DEFAULT_MIN_WORD_SIZE, dictionary, matchVersion, maxSubwordSize, minSubwordSize, minWordSize, offsetAtt, onlyLongestMatch, termAtt, tokens

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

input

Constructor Summary

Constructors

Constructor and Description
DictionaryCompoundWordTokenFilter(Version matchVersion, TokenStream input, CharArraySet dictionary) Creates a new DictionaryCompoundWordTokenFilter
DictionaryCompoundWordTokenFilter(Version matchVersion, TokenStream input, CharArraySet dictionary, int minWordSize, int minSubwordSize, int maxSubwordSize, boolean onlyLongestMatch) Creates a new DictionaryCompoundWordTokenFilter

Method Summary

Methods

Modifier and Type	Method and Description
protected void	decompose() Decomposes the current CompoundWordTokenFilterBase.termAtt and places CompoundWordTokenFilterBase.CompoundToken instances in the CompoundWordTokenFilterBase.tokens list.

Methods inherited from class org.apache.lucene.analysis.compound.CompoundWordTokenFilterBase

incrementToken, reset

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

close, end

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DictionaryCompoundWordTokenFilter

public DictionaryCompoundWordTokenFilter(Version matchVersion,
                                 TokenStream input,
                                 CharArraySet dictionary)

Creates a new DictionaryCompoundWordTokenFilter

Parameters:

matchVersion - Lucene version to enable correct Unicode 4.0 behavior in the dictionaries if Version > 3.0. See CompoundWordTokenFilterBase for details.

input - the TokenStream to process

dictionary - the word dictionary to match against.

DictionaryCompoundWordTokenFilter

public DictionaryCompoundWordTokenFilter(Version matchVersion,
                                 TokenStream input,
                                 CharArraySet dictionary,
                                 int minWordSize,
                                 int minSubwordSize,
                                 int maxSubwordSize,
                                 boolean onlyLongestMatch)

Creates a new DictionaryCompoundWordTokenFilter

Parameters:

matchVersion - Lucene version to enable correct Unicode 4.0 behavior in the dictionaries if Version > 3.0. See CompoundWordTokenFilterBase for details.

input - the TokenStream to process

dictionary - the word dictionary to match against.

minWordSize - only words longer than this get processed

minSubwordSize - only subwords longer than this get to the output stream

maxSubwordSize - only subwords shorter than this get to the output stream

onlyLongestMatch - Add only the longest matching subword to the stream

Method Detail

decompose

protected void decompose()

Description copied from class: CompoundWordTokenFilterBase

Decomposes the current CompoundWordTokenFilterBase.termAtt and places CompoundWordTokenFilterBase.CompoundToken instances in the CompoundWordTokenFilterBase.tokens list. The original token may not be placed in the list, as it is automatically passed through this filter.

Specified by:

decompose in class CompoundWordTokenFilterBase