public final class GermanStemFilter extends TokenFilter
TokenFilter that stems German words.
It supports a table of words that should
not be stemmed at all. The stemmer used can be changed at runtime after the
filter object is created (as long as it is a GermanStemmer).
To prevent terms from being stemmed use an instance of
KeywordMarkerFilter or a custom TokenFilter that sets
the KeywordAttribute before this TokenStream.
KeywordMarkerFilterAttributeSource.AttributeFactory, AttributeSource.Stateinput| Constructor and Description |
|---|
GermanStemFilter(TokenStream in)
Creates a
GermanStemFilter instance |
GermanStemFilter(TokenStream in,
Set<?> exclusionSet)
Deprecated.
use
KeywordAttribute with KeywordMarkerFilter instead. |
| Modifier and Type | Method and Description |
|---|---|
boolean |
incrementToken()
Consumers (i.e.,
IndexWriter) use this method to advance the stream to
the next token. |
void |
setExclusionSet(Set<?> exclusionSet)
Deprecated.
use
KeywordAttribute with KeywordMarkerFilter instead. |
void |
setStemmer(GermanStemmer stemmer)
Set a alternative/custom
GermanStemmer for this filter. |
close, end, resetaddAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState, toStringpublic GermanStemFilter(TokenStream in)
GermanStemFilter instancein - the source TokenStream@Deprecated public GermanStemFilter(TokenStream in, Set<?> exclusionSet)
public boolean incrementToken()
throws IOException
TokenStreamIndexWriter) use this method to advance the stream to
the next token. Implementing classes must implement this method and update
the appropriate AttributeImpls with the attributes of the next
token.
The producer must make no assumptions about the attributes after the method
has been returned: the caller may arbitrarily change it. If the producer
needs to preserve the state for subsequent calls, it can use
AttributeSource.captureState() to create a copy of the current attribute state.
This method is called for every token of a document, so an efficient
implementation is crucial for good performance. To avoid calls to
AttributeSource.addAttribute(Class) and AttributeSource.getAttribute(Class),
references to all AttributeImpls that this stream uses should be
retrieved during instantiation.
To ensure that filters and consumers know which attributes are available,
the attributes must be added during instantiation. Filters and consumers
are not required to check for availability of attributes in
TokenStream.incrementToken().
incrementToken in class TokenStreamIOExceptionpublic void setStemmer(GermanStemmer stemmer)
GermanStemmer for this filter.@Deprecated public void setExclusionSet(Set<?> exclusionSet)