org.apache.xerces.impl

Class XMLEntityManager.RewindableInputStream

java.lang.Object

java.io.InputStream

org.apache.xerces.impl.XMLEntityManager.RewindableInputStream

All Implemented Interfaces:

java.io.Closeable

Enclosing class:

XMLEntityManager

protected final class XMLEntityManager.RewindableInputStream
extends java.io.InputStream

This class wraps the byte inputstreams we're presented with. We need it because java.io.InputStreams don't provide functionality to reread processed bytes, and they have a habit of reading more than one character when you call their read() methods. This means that, once we discover the true (declared) encoding of a document, we can neither backtrack to read the whole doc again nor start reading where we are with a new reader. This class allows rewinding an inputStream by allowing a mark to be set, and the stream reset to that position. The class assumes that it needs to read one character per invocation when it's read() method is inovked, but uses the underlying InputStream's read(char[], offset length) method--it won't buffer data read this way!

Author:

Neil Graham, IBM, Glenn Marcy, IBM

Constructor Summary

Constructors

Constructor and Description
XMLEntityManager.RewindableInputStream(java.io.InputStream is)

Method Summary

Methods

Modifier and Type	Method and Description
int	available()
void	close()
void	mark(int howMuch)
boolean	markSupported()
int	read()
int	read(byte[] b, int off, int len)
void	reset()
void	rewind()
void	setStartOffset(int offset)
long	skip(long n)

Methods inherited from class java.io.InputStream

read

Methods inherited from class java.lang.Object

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

Constructor Detail

XMLEntityManager.RewindableInputStream

public XMLEntityManager.RewindableInputStream(java.io.InputStream is)

Method Detail

setStartOffset

public void setStartOffset(int offset)

rewind

public void rewind()

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

read

public int read(byte[] b,
       int off,
       int len)
         throws java.io.IOException

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

skip

public long skip(long n)
          throws java.io.IOException

Overrides:

skip in class java.io.InputStream

Throws:

java.io.IOException

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException

mark

public void mark(int howMuch)

Overrides:

mark in class java.io.InputStream

reset

public void reset()

Overrides:

reset in class java.io.InputStream

markSupported

public boolean markSupported()

Overrides:

markSupported in class java.io.InputStream

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException