org.apache.commons.io.input
Class BoundedInputStream

java.lang.Object
  extended by java.io.InputStream
      extended by org.apache.commons.io.input.BoundedInputStream
All Implemented Interfaces:
Closeable

public class BoundedInputStream
extends InputStream

This is a stream that will only supply bytes up to a certain length - if its position goes above that, it will stop.

This is useful to wrap ServletInputStreams. The ServletInputStream will block if you try to read content from it that isn't there, because it doesn't know whether the content hasn't arrived yet or whether the content has finished. So, one of these, initialized with the Content-length sent in the ServletInputStream's header, will stop it blocking, providing it's been sent with a correct content length.

Since:
2.0
Version:
$Id: BoundedInputStream.java 1307462 2012-03-30 15:13:11Z ggregory $

Constructor Summary
BoundedInputStream(InputStream in)
          Creates a new BoundedInputStream that wraps the given input stream and is unlimited.
BoundedInputStream(InputStream in, long size)
          Creates a new BoundedInputStream that wraps the given input stream and limits it to a certain size.
 
Method Summary
 int available()
          
 void close()
          Invokes the delegate's close() method if isPropagateClose() is true.
 boolean isPropagateClose()
          Indicates whether the close() method should propagate to the underling InputStream.
 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 if the current position is less than the limit.
 int read(byte[] b)
          Invokes the delegate's read(byte[]) method.
 int read(byte[] b, int off, int len)
          Invokes the delegate's read(byte[], int, int) method.
 void reset()
          Invokes the delegate's reset() method.
 void setPropagateClose(boolean propagateClose)
          Set whether the close() method should propagate to the underling InputStream.
 long skip(long n)
          Invokes the delegate's skip(long) method.
 String toString()
          Invokes the delegate's toString() method.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

BoundedInputStream

public BoundedInputStream(InputStream in,
                          long size)
Creates a new BoundedInputStream that wraps the given input stream and limits it to a certain size.

Parameters:
in - The wrapped input stream
size - The maximum number of bytes to return

BoundedInputStream

public BoundedInputStream(InputStream in)
Creates a new BoundedInputStream that wraps the given input stream and is unlimited.

Parameters:
in - The wrapped input stream
Method Detail

read

public int read()
         throws IOException
Invokes the delegate's read() method if the current position is less than the limit.

Specified by:
read in class InputStream
Returns:
the byte read or -1 if the end of stream or the limit has been reached.
Throws:
IOException - if an I/O error occurs

read

public int read(byte[] b)
         throws IOException
Invokes the delegate's read(byte[]) method.

Overrides:
read in class InputStream
Parameters:
b - the buffer to read the bytes into
Returns:
the number of bytes read or -1 if the end of stream or the limit has been reached.
Throws:
IOException - if an I/O error occurs

read

public int read(byte[] b,
                int off,
                int len)
         throws IOException
Invokes the delegate's read(byte[], int, int) method.

Overrides:
read in class InputStream
Parameters:
b - 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 or the limit has been reached.
Throws:
IOException - if an I/O error occurs

skip

public long skip(long n)
          throws IOException
Invokes the delegate's skip(long) method.

Overrides:
skip in class InputStream
Parameters:
n - 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

Overrides:
available in class InputStream
Throws:
IOException

toString

public String toString()
Invokes the delegate's toString() method.

Overrides:
toString in class Object
Returns:
the delegate's toString()

close

public void close()
           throws IOException
Invokes the delegate's close() method if isPropagateClose() is true.

Specified by:
close in interface Closeable
Overrides:
close in class InputStream
Throws:
IOException - if an I/O error occurs

reset

public void reset()
           throws IOException
Invokes the delegate's reset() method.

Overrides:
reset in class InputStream
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 InputStream
Parameters:
readlimit - read ahead limit

markSupported

public boolean markSupported()
Invokes the delegate's markSupported() method.

Overrides:
markSupported in class InputStream
Returns:
true if mark is supported, otherwise false

isPropagateClose

public boolean isPropagateClose()
Indicates whether the close() method should propagate to the underling InputStream.

Returns:
true if calling close() propagates to the close() method of the underlying stream or false if it does not.

setPropagateClose

public void setPropagateClose(boolean propagateClose)
Set whether the close() method should propagate to the underling InputStream.

Parameters:
propagateClose - true if calling close() propagates to the close() method of the underlying stream or false if it does not.


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