Package org.apache.lucene.analysis.compound

Class HyphenationCompoundWordTokenFilter

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.HyphenationCompoundWordTokenFilter

All Implemented Interfaces:

Closeable, AutoCloseable

public class HyphenationCompoundWordTokenFilter
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 hyphenation grammar and a word dictionary to achieve this.

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.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, maxSubwordSize, minSubwordSize, minWordSize, offsetAtt, onlyLongestMatch, termAtt, tokens

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

input

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

DEFAULT_TOKEN_ATTRIBUTE_FACTORY

Constructor Summary

Constructors

Constructor	Description
HyphenationCompoundWordTokenFilter(TokenStream input, HyphenationTree hyphenator)	Create a HyphenationCompoundWordTokenFilter with no dictionary.
HyphenationCompoundWordTokenFilter(TokenStream input, HyphenationTree hyphenator, int minWordSize, int minSubwordSize, int maxSubwordSize)	Create a HyphenationCompoundWordTokenFilter with no dictionary.
HyphenationCompoundWordTokenFilter(TokenStream input, HyphenationTree hyphenator, CharArraySet dictionary)	Creates a new HyphenationCompoundWordTokenFilter instance.
HyphenationCompoundWordTokenFilter(TokenStream input, HyphenationTree hyphenator, CharArraySet dictionary, int minWordSize, int minSubwordSize, int maxSubwordSize, boolean onlyLongestMatch)	Creates a new HyphenationCompoundWordTokenFilter instance.

Method Summary

Modifier and Type	Method	Description
protected void	decompose()	Decomposes the current CompoundWordTokenFilterBase.termAtt and places CompoundWordTokenFilterBase.CompoundToken instances in the CompoundWordTokenFilterBase.tokens list.
static HyphenationTree	getHyphenationTree(String hyphenationFilename)	Create a hyphenator tree
static HyphenationTree	getHyphenationTree(InputSource hyphenationSource)	Create a hyphenator tree

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, endAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, removeAllAttributes, restoreState, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

HyphenationCompoundWordTokenFilter

public HyphenationCompoundWordTokenFilter(TokenStream input,
                                          HyphenationTree hyphenator,
                                          CharArraySet dictionary)

Creates a new HyphenationCompoundWordTokenFilter instance.

Parameters:

input - the TokenStream to process

hyphenator - the hyphenation pattern tree to use for hyphenation

dictionary - the word dictionary to match against.

HyphenationCompoundWordTokenFilter

public HyphenationCompoundWordTokenFilter(TokenStream input,
                                          HyphenationTree hyphenator,
                                          CharArraySet dictionary,
                                          int minWordSize,
                                          int minSubwordSize,
                                          int maxSubwordSize,
                                          boolean onlyLongestMatch)

Creates a new HyphenationCompoundWordTokenFilter instance.

Parameters:

input - the TokenStream to process

hyphenator - the hyphenation pattern tree to use for hyphenation

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

HyphenationCompoundWordTokenFilter

public HyphenationCompoundWordTokenFilter(TokenStream input,
                                          HyphenationTree hyphenator,
                                          int minWordSize,
                                          int minSubwordSize,
                                          int maxSubwordSize)

Create a HyphenationCompoundWordTokenFilter with no dictionary.

Calls HyphenationCompoundWordTokenFilter(matchVersion, input, hyphenator, null, minWordSize, minSubwordSize, maxSubwordSize

HyphenationCompoundWordTokenFilter

public HyphenationCompoundWordTokenFilter(TokenStream input,
                                          HyphenationTree hyphenator)

Create a HyphenationCompoundWordTokenFilter with no dictionary.

Calls HyphenationCompoundWordTokenFilter(matchVersion, input, hyphenator, DEFAULT_MIN_WORD_SIZE, DEFAULT_MIN_SUBWORD_SIZE, DEFAULT_MAX_SUBWORD_SIZE

Method Detail

getHyphenationTree

public static HyphenationTree getHyphenationTree(String hyphenationFilename)
                                          throws IOException

Create a hyphenator tree

Parameters:

hyphenationFilename - the filename of the XML grammar to load

Returns:

An object representing the hyphenation patterns

Throws:

IOException - If there is a low-level I/O error.

getHyphenationTree

public static HyphenationTree getHyphenationTree(InputSource hyphenationSource)
                                          throws IOException

Create a hyphenator tree

Parameters:

hyphenationSource - the InputSource pointing to the XML grammar

Returns:

An object representing the hyphenation patterns

Throws:

IOException - If there is a low-level I/O error.

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