public final class PatternReplaceFilter extends TokenFilter
Note: Depending on the input and the pattern used and the input TokenStream, this TokenFilter may produce Tokens whose text is the empty string.
|Constructor and Description|
Constructs an instance to replace either the first, or all occurances
|Modifier and Type||Method and Description|
addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, endAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, removeAllAttributes, restoreState, toString
public PatternReplaceFilter(TokenStream in, Pattern p, String replacement, boolean all)
in- the TokenStream to process
p- the patterm to apply to each Token
replacement- the "replacement string" to substitute, if null a blank string will be used. Note that this is not the literal string that will be used, '$' and '\' have special meaning.
all- if true, all matches will be replaced otherwise just the first match.
public boolean incrementToken() throws IOException
IndexWriter) 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
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