org.apache.lucene.analysis.miscellaneous

Class CapitalizationFilter

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

org.apache.lucene.analysis.miscellaneous.CapitalizationFilter

All Implemented Interfaces:

Closeable, AutoCloseable

public final class CapitalizationFilter
extends TokenFilter

A filter to apply normal capitalization rules to Tokens. It will make the first letter capital and the rest lower case.

This filter is particularly useful to build nice looking facet parameters. This filter is not appropriate if you intend to use a prefix query.

Nested Class Summary

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

AttributeSource.State

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_MAX_TOKEN_LENGTH
static int	DEFAULT_MAX_WORD_COUNT

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 and Description
CapitalizationFilter(TokenStream in) Creates a CapitalizationFilter with the default parameters.
CapitalizationFilter(TokenStream in, boolean onlyFirstWord, CharArraySet keep, boolean forceFirstLetter, Collection<char[]> okPrefix, int minWordLength, int maxWordCount, int maxTokenLength) Creates a CapitalizationFilter with the specified parameters.

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, 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

Field Detail

DEFAULT_MAX_WORD_COUNT

public static final int DEFAULT_MAX_WORD_COUNT

See Also:

Constant Field Values

DEFAULT_MAX_TOKEN_LENGTH

public static final int DEFAULT_MAX_TOKEN_LENGTH

See Also:

Constant Field Values

Constructor Detail

CapitalizationFilter

public CapitalizationFilter(TokenStream in)

Creates a CapitalizationFilter with the default parameters.

Calls CapitalizationFilter(in, true, null, true, null, 0, DEFAULT_MAX_WORD_COUNT, DEFAULT_MAX_TOKEN_LENGTH)

CapitalizationFilter

public CapitalizationFilter(TokenStream in,
                            boolean onlyFirstWord,
                            CharArraySet keep,
                            boolean forceFirstLetter,
                            Collection<char[]> okPrefix,
                            int minWordLength,
                            int maxWordCount,
                            int maxTokenLength)

Creates a CapitalizationFilter with the specified parameters.

Parameters:

in - input tokenstream

onlyFirstWord - should each word be capitalized or all of the words?

keep - a keep word list. Each word that should be kept separated by whitespace.

forceFirstLetter - Force the first letter to be capitalized even if it is in the keep list.

okPrefix - do not change word capitalization if a word begins with something in this list.

minWordLength - how long the word needs to be to get capitalization applied. If the minWordLength is 3, "and" > "And" but "or" stays "or".

maxWordCount - if the token contains more then maxWordCount words, the capitalization is assumed to be correct.

maxTokenLength - ???

Method Detail

incrementToken

public boolean incrementToken()
                       throws IOException

Specified by:

incrementToken in class TokenStream

Throws:

IOException