org.apache.commons.io.input
Class ProxyInputStream

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          org.apache.commons.io.input.ProxyInputStream

All Implemented Interfaces:

java.io.Closeable

Direct Known Subclasses:

AutoCloseInputStream, CloseShieldInputStream, CountingInputStream, SwappedDataInputStream, TeeInputStream

public abstract class ProxyInputStream
extends java.io.FilterInputStream

A Proxy stream which acts as expected, that is it passes the method calls on to the proxied stream and doesn't change which methods are being called.

It is an alternative base class to FilterInputStream to increase reusability, because FilterInputStream changes the methods being called, such as read(byte[]) to read(byte[], int, int).

Version:

$Id: ProxyInputStream.java 610010 2008-01-08 14:50:59Z niallp $

Author:

Stephen Colebourne

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

ProxyInputStream(java.io.InputStream proxy)
Constructs a new ProxyInputStream.

Method Summary

int	available() Invokes the delegate's available() method.
void	close() Invokes the delegate's close() method.
void	mark(int idx) Invokes the delegate's mark(int) method.
boolean	markSupported() Invokes the delegate's markSupported() method.
int	read() Invokes the delegate's read() method.
int	read(byte[] bts) Invokes the delegate's read(byte[]) method.
int	read(byte[] bts, int st, int end) Invokes the delegate's read(byte[], int, int) method.
void	reset() Invokes the delegate's reset() method.
long	skip(long ln) Invokes the delegate's skip(long) method.

Methods inherited from class java.lang.Object

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

Constructor Detail

ProxyInputStream

public ProxyInputStream(java.io.InputStream proxy)

Constructs a new ProxyInputStream.

Parameters:

proxy - the InputStream to delegate to

Method Detail

read

public int read()
         throws java.io.IOException

Invokes the delegate's read() method.

Overrides:

read in class java.io.FilterInputStream

Returns:

the byte read or -1 if the end of stream

Throws:

java.io.IOException - if an I/O error occurs

read

public int read(byte[] bts)
         throws java.io.IOException

Invokes the delegate's read(byte[]) method.

Overrides:

read in class java.io.FilterInputStream

Parameters:

bts - the buffer to read the bytes into

Returns:

the number of bytes read or -1 if the end of stream

Throws:

java.io.IOException - if an I/O error occurs

read

public int read(byte[] bts,
                int st,
                int end)
         throws java.io.IOException

Invokes the delegate's read(byte[], int, int) method.

Overrides:

read in class java.io.FilterInputStream

Parameters:

bts - the buffer to read the bytes into

st - The start offset

end - The number of bytes to read

Returns:

the number of bytes read or -1 if the end of stream

Throws:

java.io.IOException - if an I/O error occurs

skip

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

Invokes the delegate's skip(long) method.

Overrides:

skip in class java.io.FilterInputStream

Parameters:

ln - the number of bytes to skip

Returns:

the number of bytes to skipped or -1 if the end of stream

Throws:

java.io.IOException - if an I/O error occurs

available

public int available()
              throws java.io.IOException

Invokes the delegate's available() method.

Overrides:

available in class java.io.FilterInputStream

Returns:

the number of available bytes

Throws:

java.io.IOException - if an I/O error occurs

close

public void close()
           throws java.io.IOException

Invokes the delegate's close() method.

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.FilterInputStream

Throws:

java.io.IOException - if an I/O error occurs

mark

public void mark(int idx)

Invokes the delegate's mark(int) method.

Overrides:

mark in class java.io.FilterInputStream

Parameters:

idx - read ahead limit

reset

public void reset()
           throws java.io.IOException

Invokes the delegate's reset() method.

Overrides:

reset in class java.io.FilterInputStream

Throws:

java.io.IOException - if an I/O error occurs

markSupported

public boolean markSupported()

Invokes the delegate's markSupported() method.

Overrides:

markSupported in class java.io.FilterInputStream

Returns:

true if mark is supported, otherwise false