org.apache.jackrabbit.oak.plugins.index.lucene.util

Class CompoundWordTokenFilterBase

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

org.apache.jackrabbit.oak.plugins.index.lucene.util.CompoundWordTokenFilterBase

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

OakWordTokenFilter

public abstract class CompoundWordTokenFilterBase
extends org.apache.lucene.analysis.TokenFilter

Base class for decomposition token filters.

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

Modifier and Type	Class and Description
protected class	CompoundWordTokenFilterBase.CompoundToken Helper class to hold decompounded token information

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 int	DEFAULT_MAX_SUBWORD_SIZE The default for maximal length of subwords that get propagated to the output of this filter
static int	DEFAULT_MIN_SUBWORD_SIZE The default for minimal length of subwords that get propagated to the output of this filter
static int	DEFAULT_MIN_WORD_SIZE The default for minimal word length that gets decomposed
protected org.apache.lucene.analysis.util.CharArraySet	dictionary
protected int	maxSubwordSize
protected int	minSubwordSize
protected int	minWordSize
protected org.apache.lucene.analysis.tokenattributes.OffsetAttribute	offsetAtt
protected boolean	onlyLongestMatch
protected org.apache.lucene.analysis.tokenattributes.CharTermAttribute	termAtt
protected LinkedList<CompoundWordTokenFilterBase.CompoundToken>	tokens

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

input

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CompoundWordTokenFilterBase(org.apache.lucene.util.Version matchVersion, org.apache.lucene.analysis.TokenStream input, org.apache.lucene.analysis.util.CharArraySet dictionary)
protected	CompoundWordTokenFilterBase(org.apache.lucene.util.Version matchVersion, org.apache.lucene.analysis.TokenStream input, org.apache.lucene.analysis.util.CharArraySet dictionary, boolean onlyLongestMatch)
protected	CompoundWordTokenFilterBase(org.apache.lucene.util.Version matchVersion, org.apache.lucene.analysis.TokenStream input, org.apache.lucene.analysis.util.CharArraySet dictionary, int minWordSize, int minSubwordSize, int maxSubwordSize, boolean onlyLongestMatch)

Method Summary

Methods

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

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_MIN_WORD_SIZE

public static final int DEFAULT_MIN_WORD_SIZE

The default for minimal word length that gets decomposed

See Also:

Constant Field Values

DEFAULT_MIN_SUBWORD_SIZE

public static final int DEFAULT_MIN_SUBWORD_SIZE

The default for minimal length of subwords that get propagated to the output of this filter

See Also:

Constant Field Values

DEFAULT_MAX_SUBWORD_SIZE

public static final int DEFAULT_MAX_SUBWORD_SIZE

The default for maximal length of subwords that get propagated to the output of this filter

See Also:

Constant Field Values

dictionary

protected final org.apache.lucene.analysis.util.CharArraySet dictionary

tokens

protected final LinkedList<CompoundWordTokenFilterBase.CompoundToken> tokens

minWordSize

protected final int minWordSize

minSubwordSize

protected final int minSubwordSize

maxSubwordSize

protected final int maxSubwordSize

onlyLongestMatch

protected final boolean onlyLongestMatch

termAtt

protected final org.apache.lucene.analysis.tokenattributes.CharTermAttribute termAtt

offsetAtt

protected final org.apache.lucene.analysis.tokenattributes.OffsetAttribute offsetAtt

Constructor Detail

CompoundWordTokenFilterBase

protected CompoundWordTokenFilterBase(org.apache.lucene.util.Version matchVersion,
                           org.apache.lucene.analysis.TokenStream input,
                           org.apache.lucene.analysis.util.CharArraySet dictionary,
                           boolean onlyLongestMatch)

CompoundWordTokenFilterBase

protected CompoundWordTokenFilterBase(org.apache.lucene.util.Version matchVersion,
                           org.apache.lucene.analysis.TokenStream input,
                           org.apache.lucene.analysis.util.CharArraySet dictionary)

CompoundWordTokenFilterBase

protected CompoundWordTokenFilterBase(org.apache.lucene.util.Version matchVersion,
                           org.apache.lucene.analysis.TokenStream input,
                           org.apache.lucene.analysis.util.CharArraySet dictionary,
                           int minWordSize,
                           int minSubwordSize,
                           int maxSubwordSize,
                           boolean onlyLongestMatch)

Method Detail

incrementToken

public final boolean incrementToken()
                             throws IOException

Specified by:

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

Throws:

IOException

decompose

protected abstract void decompose()

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

reset

public void reset()
           throws IOException

Overrides:

reset in class org.apache.lucene.analysis.TokenFilter

Throws:

IOException