C# Class Lucene.Net.Analysis.CharFilter

Subclasses of CharFilter can be chained to filter a Reader They can be used as java.io.Reader with additional offset correction. Tokenizers will automatically use #correctOffset if a CharFilter subclass is used.

this class is abstract: at a minimum you must implement #read(char[], int, int), transforming the input in some way from #input, and #correct(int) to adjust the offsets to match the originals.

You can optionally provide more efficient implementations of additional methods like #read(), #read(char[]), #read(java.nio.CharBuffer), but this is not required.

For examples and integration with Analyzer, see the Lucene.Net.Analysis Analysis package documentation.

Inheritance: System.IO.TextReader

显示文件 Open project: apache/lucenenet

Public Properties

Property	Type	Description
input	System.IO.TextReader

Public Methods

Method	Description
Close ( ) : void	Closes the underlying input stream. NOTE: The default implementation closes the input Reader, so be sure to call `super.close()` when overriding this method.
CorrectOffset ( int currentOff ) : int	Chains the corrected offset through the input CharFilter(s).
Mark ( int readAheadLimit ) : void	Marks the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point. Not all character-input streams support the mark() operation. LUCENENET specific. Moved here from the Java Reader class so it can be overridden to provide reader buffering.
Ready ( ) : bool	Tells whether this stream is ready to be read. True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block. LUCENENET specific. Moved here from the Java Reader class so it can be overridden to provide reader buffering.
Reset ( ) : void	LUCENENET specific. Moved here from the Java Reader class so it can be overridden to provide reader buffering.
Skip ( int n ) : long	Skips characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached. LUCENENET specific. Moved here from the Java Reader class so it can be overridden to provide reader buffering.

Protected Methods

Method	Description
CharFilter ( TextReader input ) : System	Create a new CharFilter wrapping the provided reader.
Correct ( int currentOff ) : int	Subclasses override to correct the current offset.

Method Details

CharFilter() protected method

Create a new CharFilter wrapping the provided reader.

protected CharFilter ( TextReader input ) : System
input	System.IO.TextReader	a Reader, can also be a CharFilter for chaining.
return	System

Close() public method

Closes the underlying input stream.

NOTE: The default implementation closes the input Reader, so be sure to call super.close() when overriding this method.

public Close ( ) : void
return	void

Correct() protected abstract method

Subclasses override to correct the current offset.

protected abstract Correct ( int currentOff ) : int
currentOff	int	current offset
return	int

CorrectOffset() public method

Chains the corrected offset through the input CharFilter(s).

public CorrectOffset ( int currentOff ) : int
currentOff	int
return	int

Mark() public method

Marks the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point. Not all character-input streams support the mark() operation. LUCENENET specific. Moved here from the Java Reader class so it can be overridden to provide reader buffering.

public Mark ( int readAheadLimit ) : void
readAheadLimit	int	Limit on the number of characters that may be read while still preserving the mark. After /// reading this many characters, attempting to reset the stream may fail.
return	void

Ready() public method

Tells whether this stream is ready to be read. True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block. LUCENENET specific. Moved here from the Java Reader class so it can be overridden to provide reader buffering.

public Ready ( ) : bool
return	bool

Reset() public method

LUCENENET specific. Moved here from the Java Reader class so it can be overridden to provide reader buffering.

public Reset ( ) : void
return	void

Skip() public method

Skips characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached. LUCENENET specific. Moved here from the Java Reader class so it can be overridden to provide reader buffering.

public Skip ( int n ) : long
n	int	The number of characters to skip
return	long

Property Details

input public_oe property

The underlying character-input stream.

public TextReader,System.IO input
return	System.IO.TextReader