com.helger.web.fileupload.io

Class AbstractLimitedInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

com.helger.web.fileupload.io.AbstractLimitedInputStream

All Implemented Interfaces:

com.helger.commons.state.ICloseable, Closeable, AutoCloseable

public abstract class AbstractLimitedInputStream
extends FilterInputStream
implements com.helger.commons.state.ICloseable

An input stream, which limits its data size. This stream is used, if the content length is unknown.

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor and Description
AbstractLimitedInputStream(InputStream aIS, long nSizeMax) Creates a new instance.

Method Summary

Modifier and Type	Method and Description
void	close() Closes this input stream and releases any system resources associated with the stream.
boolean	isClosed() Returns, whether this stream is already closed.
protected abstract void	onLimitExceeded(long nSizeMax, long nCount) Called to indicate, that the input streams limit has been exceeded.
int	read() Reads the next byte of data from this input stream.
int	read(byte[] b, int nOfs, int nLen) Reads up to len bytes of data from this input stream into an array of bytes.

Methods inherited from class java.io.FilterInputStream

available, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractLimitedInputStream

public AbstractLimitedInputStream(@Nonnull
                                  InputStream aIS,
                                  @Nonnegative
                                  long nSizeMax)

Creates a new instance.

Parameters:

aIS - The input stream, which shall be limited.

nSizeMax - The limit; no more than this number of bytes shall be returned by the source stream.

Method Detail

onLimitExceeded

protected abstract void onLimitExceeded(@Nonnegative
                                        long nSizeMax,
                                        @Nonnegative
                                        long nCount)
                                 throws IOException

Called to indicate, that the input streams limit has been exceeded.

Parameters:

nSizeMax - The input streams limit, in bytes.

nCount - The actual number of bytes.

Throws:

IOException - The called method is expected to raise an IOException.

read

public int read()
         throws IOException

Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

This method simply performs in.read() and returns the result.

Overrides:

read in class FilterInputStream

Returns:

the next byte of data, or -1 if the end of the stream is reached.

Throws:

IOException - if an I/O error occurs.

See Also:

FilterInputStream

read

public int read(@Nonnull
                byte[] b,
                @Nonnegative
                int nOfs,
                @Nonnegative
                int nLen)
         throws IOException

Reads up to len bytes of data from this input stream into an array of bytes. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned.

This method simply performs in.read(b, off, len) and returns the result.

Overrides:

read in class FilterInputStream

Parameters:

b - the buffer into which the data is read.

nOfs - The start offset in the destination array b.

nLen - the maximum number of bytes read.

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off

IOException - if an I/O error occurs.

See Also:

FilterInputStream

isClosed

public boolean isClosed()
                 throws IOException

Returns, whether this stream is already closed.

Specified by:

isClosed in interface com.helger.commons.state.ICloseable

Returns:

True, if the stream is closed, otherwise false.

Throws:

IOException - An I/O error occurred.

close

public void close()
           throws IOException

Closes this input stream and releases any system resources associated with the stream. This method simply performs in.close().

Specified by:

close in interface com.helger.commons.state.ICloseable

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class FilterInputStream

Throws:

IOException - if an I/O error occurs.

See Also:

FilterInputStream