org.apache.lucene.benchmark.byTask.utils
Class StringBuilderReader

java.lang.Object
  java.io.Reader
      org.apache.lucene.benchmark.byTask.utils.StringBuilderReader

All Implemented Interfaces:

Closeable, Readable

public class StringBuilderReader
extends Reader

Implements a Reader over a StringBuilder instance. Although one can use StringReader by passing it StringBuilder.toString(), it is better to use this class, as it doesn't mark the passed-in StringBuilder as shared (which will cause inner char[] allocations at the next append() attempt).
Notes:

• This implementation assumes the underlying StringBuilder is not changed during the use of this Reader implementation.
• This implementation is thread-safe.
• The implementation looks very much like StringReader (for the right reasons).
• If one wants to reuse that instance, then the following needs to be done:

   StringBuilder sb = new StringBuilder("some text");
   Reader reader = new StringBuilderReader(sb);
   ... read from reader - don't close it ! ...
   sb.setLength(0);
   sb.append("some new text");
   reader.reset();
   ... read the new string from the reader ...
   

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

StringBuilderReader(StringBuilder sb)

Method Summary

void	close()
void	mark(int readAheadLimit) Mark the present position in the stream.
boolean	markSupported()
int	read()
int	read(char[] cbuf, int off, int len)
boolean	ready()
void	reset()
void	set(StringBuilder sb)
long	skip(long ns)

Methods inherited from class java.io.Reader

read, read

Methods inherited from class java.lang.Object

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

Constructor Detail

StringBuilderReader

public StringBuilderReader(StringBuilder sb)

Method Detail

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in class Reader

mark

public void mark(int readAheadLimit)
          throws IOException

Mark the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.

Overrides:

mark in class Reader

Parameters:

readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. Because the stream's input comes from a StringBuilder, there is no actual limit, so this argument must not be negative, but is otherwise ignored.

Throws:

IllegalArgumentException - If readAheadLimit is < 0

IOException - If an I/O error occurs

markSupported

public boolean markSupported()

Overrides:

markSupported in class Reader

read

public int read()
         throws IOException

Overrides:

read 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

ready

public boolean ready()
              throws IOException

Overrides:

ready in class Reader

Throws:

IOException

reset

public void reset()
           throws IOException

Overrides:

reset in class Reader

Throws:

IOException

set

public void set(StringBuilder sb)

skip

public long skip(long ns)
          throws IOException

Overrides:

skip in class Reader

Throws:

IOException