Package org.camunda.spin.impl.util

Class RewindableReader

java.lang.Object

java.io.Reader

org.camunda.spin.impl.util.RewindableReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class RewindableReader
extends Reader

Caches the initial characters that are read from the supplied Reader and allows to rewind these. As soon as more than size characters have been read, rewinding fails.

Author:

Thorben Lindhauer

Field Summary

Fields

Modifier and Type	Field	Description
protected char[]	buffer
protected int	pos
protected boolean	rewindable
protected PushbackReader	wrappedReader

Fields inherited from class java.io.Reader

lock

Constructor Summary

Constructors

Constructor	Description
RewindableReader(Reader input, int size)

Method Summary

Modifier and Type	Method	Description
void	close()
int	getCurrentRewindableCapacity()
int	getRewindBufferSize()
void	mark(int readlimit)
boolean	markSupported()
int	read()
int	read(char[] cbuf, int off, int len)
void	reset()
void	rewind()	Rewinds the reader such that the initial characters are returned when invoking read().
long	skip(long n)

Methods inherited from class java.io.Reader

nullReader, read, read, ready, transferTo

Methods inherited from class java.lang.Object

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

Field Details

wrappedReader

protected PushbackReader wrappedReader

buffer

protected char[] buffer

pos

protected int pos

rewindable

protected boolean rewindable

Constructor Details

RewindableReader

public RewindableReader(Reader input,
 int size)

Method Details

read

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

Specified by:

read in class Reader

Throws:

IOException

read

public int read()
         throws IOException

Overrides:

read in class Reader

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException

mark

public void mark(int readlimit)
          throws IOException

Overrides:

mark in class Reader

Throws:

IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class Reader

reset

public void reset()
           throws IOException

Overrides:

reset in class Reader

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class Reader

Throws:

IOException

rewind

public void rewind()
            throws IOException

Rewinds the reader such that the initial characters are returned when invoking read(). Throws an exception if more than the buffering limit has already been read.

Throws:

IOException

getRewindBufferSize

public int getRewindBufferSize()

getCurrentRewindableCapacity

public int getCurrentRewindableCapacity()

Returns:

the number of characters that can still be read and rewound.