public final class ThaiWordFilter extends TokenFilter
TokenFilter that use BreakIterator to break each
Token that is Thai into separate Token(s) for each Thai word.
Please note: Since matchVersion 3.1 on, this filter no longer lowercases non-thai text.
ThaiAnalyzer will insert a LowerCaseFilter before this filter
so the behaviour of the Analyzer does not change. With version 3.1, the filter handles
position increments correctly.
WARNING: this filter may not be supported by all JREs. It is known to work with Sun/Oracle and Harmony JREs. If your application needs to be fully portable, consider using ICUTokenizer instead, which uses an ICU Thai BreakIterator that will always be available.
AttributeSource.AttributeFactory, AttributeSource.State| Modifier and Type | Field and Description |
|---|---|
static boolean |
DBBI_AVAILABLE
True if the JRE supports a working dictionary-based breakiterator for Thai.
|
input| Constructor and Description |
|---|
ThaiWordFilter(TokenStream input)
Deprecated.
Use the ctor with
matchVersion instead! |
ThaiWordFilter(Version matchVersion,
TokenStream input)
Creates a new ThaiWordFilter with the specified match version.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
incrementToken()
Consumers (i.e.,
IndexWriter) use this method to advance the stream to
the next token. |
void |
reset()
Reset the filter as well as the input TokenStream.
|
close, endaddAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState, toStringpublic static final boolean DBBI_AVAILABLE
@Deprecated public ThaiWordFilter(TokenStream input)
matchVersion instead!public ThaiWordFilter(Version matchVersion, TokenStream input)
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 reset()
throws IOException
TokenFilterreset in class TokenFilterIOException