org.apache.lucene.analysis
Class CharFilter

java.lang.Object
  java.io.Reader
      org.apache.lucene.analysis.CharStream
          org.apache.lucene.analysis.CharFilter

All Implemented Interfaces:

Closeable, Readable

Direct Known Subclasses:

BaseCharFilter, PersianCharFilter

public abstract class CharFilter
extends CharStream

Subclasses of CharFilter can be chained to filter CharStream. They can be used as Reader with additional offset correction. Tokenizers will automatically use correctOffset(int) if a CharFilter/CharStream subclass is used.

Field Summary

protected CharStream

input

Fields inherited from class java.io.Reader

lock

Constructor Summary

protected

CharFilter(CharStream in)

Method Summary

void	close()
protected int	correct(int currentOff) Subclass may want to override to correct the current offset.
int	correctOffset(int currentOff) Chains the corrected offset through the input CharFilter.
void	mark(int readAheadLimit)
boolean	markSupported()
int	read(char[] cbuf, int off, int len)
void	reset()

Methods inherited from class java.io.Reader

read, read, read, ready, skip

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

input

protected CharStream input

Constructor Detail

CharFilter

protected CharFilter(CharStream in)

Method Detail

correct

protected int correct(int currentOff)

Subclass may want to override to correct the current offset.

Parameters:

currentOff - current offset

Returns:

corrected offset

correctOffset

public final int correctOffset(int currentOff)

Chains the corrected offset through the input CharFilter.

Specified by:

correctOffset in class CharStream

Parameters:

currentOff - offset as seen in the output

Returns:

corrected offset based on the input

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException

read

public int read(char[] cbuf,
                int off,
                int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class Reader

mark

public void mark(int readAheadLimit)
          throws IOException

Overrides:

mark in class Reader

Throws:

IOException

reset

public void reset()
           throws IOException

Overrides:

reset in class Reader

Throws:

IOException