com.unboundid.util
Class AggregateInputStream

java.lang.Object
  java.io.InputStream
      com.unboundid.util.AggregateInputStream

All Implemented Interfaces:

java.io.Closeable

@ThreadSafety(level=NOT_THREADSAFE)
public final class AggregateInputStream
extends java.io.InputStream

This class provides an input stream implementation that can aggregate multiple input streams. When reading data from this input stream, it will read from the first input stream until the end of it is reached, at point it will close it and start reading from the next one, and so on until all input streams have been exhausted. Closing the aggregate input stream will cause all remaining input streams to be closed.

Constructor Summary

AggregateInputStream(java.util.Collection<? extends java.io.InputStream> inputStreams)
Creates a new aggregate input stream that will use the provided set of input streams.

AggregateInputStream(java.io.File... files)
Creates a new aggregate input stream that will read data from the specified files.

AggregateInputStream(java.io.InputStream... inputStreams)
Creates a new aggregate input stream that will use the provided set of input streams.

Method Summary

int	available() Retrieves an estimate of the number of bytes that can be read without blocking.
void	close() Closes this input stream.
void	mark(int readLimit) Marks the current position in the input stream.
boolean	markSupported() Indicates whether this input stream supports the use of the mark and reset methods.
int	read() Reads the next byte of data from the current active input stream, switching to the next input stream in the set if appropriate.
int	read(byte[] b) Reads data from the current active input stream into the provided array, switching to the next input stream in the set if appropriate.
int	read(byte[] b, int off, int len) Reads data from the current active input stream into the provided array, switching to the next input stream in the set if appropriate.
void	reset() Attempts to reset the position of this input stream to the mark location.
long	skip(long n) Attempts to skip and discard up to the specified number of bytes from the input stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregateInputStream

public AggregateInputStream(java.io.InputStream... inputStreams)

Creates a new aggregate input stream that will use the provided set of input streams.

Parameters:

inputStreams - The input streams to be used by this aggregate input stream. It must not be null.

AggregateInputStream

public AggregateInputStream(java.util.Collection<? extends java.io.InputStream> inputStreams)

Creates a new aggregate input stream that will use the provided set of input streams.

Parameters:

inputStreams - The input streams to be used by this aggregate input stream. It must not be null.

AggregateInputStream

public AggregateInputStream(java.io.File... files)
                     throws java.io.IOException

Creates a new aggregate input stream that will read data from the specified files.

Parameters:

files - The set of files to be read by this aggregate input stream. It must not be null.

Throws:

java.io.IOException - If a problem is encountered while attempting to create input streams for the provided files.

Method Detail

read

public int read()
         throws java.io.IOException

Reads the next byte of data from the current active input stream, switching to the next input stream in the set if appropriate.

Specified by:

read in class java.io.InputStream

Returns:

The next byte of data that was read, or -1 if all streams have been exhausted.

Throws:

java.io.IOException - If a problem is encountered while attempting to read data from an input stream.

read

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

Reads data from the current active input stream into the provided array, switching to the next input stream in the set if appropriate.

Overrides:

read in class java.io.InputStream

Parameters:

b - The array into which the data read should be placed, starting with an index of zero. It must not be null.

Returns:

The number of bytes read into the array, or -1 if all streams have been exhausted.

Throws:

java.io.IOException - If a problem is encountered while attempting to read data from an input stream.

read

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

Reads data from the current active input stream into the provided array, switching to the next input stream in the set if appropriate.

Overrides:

read in class java.io.InputStream

Parameters:

b - The array into which the data read should be placed. It must not be null.

off - The position in the array at which to start writing data.

len - The maximum number of bytes that may be read.

Returns:

The number of bytes read into the array, or -1 if all streams have been exhausted.

Throws:

java.io.IOException - If a problem is encountered while attempting to read data from an input stream.

skip

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

Attempts to skip and discard up to the specified number of bytes from the input stream.

Overrides:

skip in class java.io.InputStream

Parameters:

n - The number of bytes to attempt to skip.

Returns:

The number of bytes actually skipped.

Throws:

java.io.IOException - If a problem is encountered while attempting to skip data from the input stream.

available

public int available()
              throws java.io.IOException

Retrieves an estimate of the number of bytes that can be read without blocking.

Overrides:

available in class java.io.InputStream

Returns:

An estimate of the number of bytes that can be read without blocking.

Throws:

java.io.IOException - If a problem is encountered while attempting to make the determination.

markSupported

public boolean markSupported()

Indicates whether this input stream supports the use of the mark and reset methods. This implementation does not support that capability.

Overrides:

markSupported in class java.io.InputStream

Returns:

false to indicate that this input stream implementation does not support the use of mark and reset.

mark

public void mark(int readLimit)

Marks the current position in the input stream. This input stream does not support this functionality, so no action will be taken.

Overrides:

mark in class java.io.InputStream

Parameters:

readLimit - The maximum number of bytes that the caller may wish to read before being able to reset the stream.

reset

public void reset()
           throws java.io.IOException

Attempts to reset the position of this input stream to the mark location. This implementation does not support mark and reset functionality, so this method will always throw an exception.

Overrides:

reset in class java.io.InputStream

Throws:

java.io.IOException - To indicate that reset is not supported.

close

public void close()
           throws java.io.IOException

Closes this input stream. All associated input streams will be closed.

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException - If an exception was encountered while attempting to close any of the associated streams. Note that even if an exception is encountered, an attempt will be made to close all streams.