org.at4j.comp.prog
Class AbstractStreamCompressionProgram<T extends StreamCompressionProgramArguments>

java.lang.Object
  org.at4j.support.prog.AbstractProgram
      org.at4j.comp.prog.AbstractStreamCompressionProgram<T>

Type Parameters:

T - The class containing the parsed command line arguments for the command.

Direct Known Subclasses:

BUnzip2, BZip2

public abstract class AbstractStreamCompressionProgram<T extends StreamCompressionProgramArguments>
extends AbstractProgram

An abstract base class for compression programs that use streams to compress and decompress data.

Since:

1.0

Author:

Karl Gustafsson

Constructor Summary

AbstractStreamCompressionProgram()

Method Summary

protected abstract InputStream	createInputStream(int sourceNo, T settings) Create an input stream on the source entity for the given command line arguments.
protected abstract OutputStream	createOutputStream(int targetNo, T settings) Create an output stream on the target entity for the given command line arguments.
protected abstract T	parseCommandLine(String[] args) Subclasses implement this to parse their command line.
protected void	postProcess(int sourceNo, T settings) Subclasses may override this for postprocessing the source and/or target entity.
protected void	run(String[] args)

Methods inherited from class org.at4j.support.prog.AbstractProgram

getArg, getParentLocation, isFlagArgument

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractStreamCompressionProgram

public AbstractStreamCompressionProgram()

Method Detail

parseCommandLine

protected abstract T parseCommandLine(String[] args)
                                                                         throws CommandErrorException

Subclasses implement this to parse their command line.

Parameters:

args - The command line arguments, unparsed.

Returns:

The command line arguments, parsed.

Throws:

CommandErrorException - If the commands were invalid.

createInputStream

protected abstract InputStream createInputStream(int sourceNo,
                                                 T settings)
                                          throws IOException,
                                                 IgnoreFileException

Create an input stream on the source entity for the given command line arguments.

Parameters:

sourceNo - The index number for the source entity. The first source has index == 0.

settings - The command line arguments.

Returns:

An input stream on the source.

Throws:

IOException - On I/O errors.

IgnoreFileException - If the file should be ignored for some reason.

createOutputStream

protected abstract OutputStream createOutputStream(int targetNo,
                                                   T settings)
                                            throws IOException,
                                                   IgnoreFileException

Create an output stream on the target entity for the given command line arguments.

Parameters:

targetNo - The index number for the target entity. The first target has index == 0.

settings - The command line arguments.

Returns:

An output stream on the target.

Throws:

IOException - On I/O errors.

IgnoreFileException - If the file should be ignored for some reason.

postProcess

protected void postProcess(int sourceNo,
                           T settings)
                    throws IOException

Subclasses may override this for postprocessing the source and/or target entity. This implementation does not do anything.

Parameters:

sourceNo - The index number for the source and target entities.

settings - The command line arguments.

Throws:

IOException - On I/O errors.

run

protected void run(String[] args)
            throws CommandErrorException,
                   IOException

Throws:

CommandErrorException

IOException