Package 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:

Closeable, AutoCloseable

Direct Known Subclasses:

AutoCloseInputStream, BOMInputStream, CloseShieldInputStream, CountingInputStream, MarkShieldInputStream, ObservableInputStream, SwappedDataInputStream, TaggedInputStream, TeeInputStream

public abstract class ProxyInputStream
extends 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).

See the protected methods for ways in which a subclass can easily decorate a stream with custom pre-, post- or error processing functionality.

Constructor Summary

Constructors

Constructor	Description
ProxyInputStream(InputStream proxy)	Constructs a new ProxyInputStream.

Method Summary

Modifier and Type	Method	Description
int	available()	Invokes the delegate's available() method.
void	close()	Invokes the delegate's close() method.
void	mark(int readlimit)	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 off, int len)	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.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, transferTo

Methods inherited from class java.lang.Object

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

Constructor Detail

ProxyInputStream

public ProxyInputStream(InputStream proxy)

Constructs a new ProxyInputStream.

Parameters:

proxy - the InputStream to delegate to

Method Detail

read

public int read()
         throws IOException

Invokes the delegate's read() method.

Overrides:

read in class FilterInputStream

Returns:

the byte read or -1 if the end of stream

Throws:

IOException - if an I/O error occurs

read

public int read(byte[] bts)
         throws IOException

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

Overrides:

read in class FilterInputStream

Parameters:

bts - the buffer to read the bytes into

Returns:

the number of bytes read or EOF if the end of stream

Throws:

IOException - if an I/O error occurs

read

public int read(byte[] bts,
                int off,
                int len)
         throws IOException

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

Overrides:

read in class FilterInputStream

Parameters:

bts - the buffer to read the bytes into

off - The start offset

len - The number of bytes to read

Returns:

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

Throws:

IOException - if an I/O error occurs

skip

public long skip(long ln)
          throws IOException

Invokes the delegate's skip(long) method.

Overrides:

skip in class FilterInputStream

Parameters:

ln - the number of bytes to skip

Returns:

the actual number of bytes skipped

Throws:

IOException - if an I/O error occurs

available

public int available()
              throws IOException

Invokes the delegate's available() method.

Overrides:

available in class FilterInputStream

Returns:

the number of available bytes

Throws:

IOException - if an I/O error occurs

close

public void close()
           throws IOException

Invokes the delegate's close() method.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class FilterInputStream

Throws:

IOException - if an I/O error occurs

mark

public void mark(int readlimit)

Invokes the delegate's mark(int) method.

Overrides:

mark in class FilterInputStream

Parameters:

readlimit - read ahead limit

reset

public void reset()
           throws IOException

Invokes the delegate's reset() method.

Overrides:

reset in class FilterInputStream

Throws:

IOException - if an I/O error occurs

markSupported

public boolean markSupported()

Invokes the delegate's markSupported() method.

Overrides:

markSupported in class FilterInputStream

Returns:

true if mark is supported, otherwise false