Package com.thebuzzmedia.exiftool.process.executor

Class DefaultCommandProcess

java.lang.Object

com.thebuzzmedia.exiftool.process.executor.DefaultCommandProcess

All Implemented Interfaces:

CommandProcess, AutoCloseable

public class DefaultCommandProcess
extends Object
implements CommandProcess

Default implementation for CommandProcess interface.
This implementation used instance of InputStream to handle read operation and instance of OutputStream to handle write operation. These streams may come from instance of Process for instance.
Note: This implementation is not thread safe.

Constructor Summary

Constructors

Constructor	Description
DefaultCommandProcess(InputStream is, OutputStream os, InputStream err)	Create process.

Method Summary

Modifier and Type	Method	Description
void	close()
void	flush()	Flush pending write operations.
boolean	isClosed()	Check if current process has been closed.
boolean	isRunning()	Check if current process is still opened.
String	read()	Read output until a null line is read.
String	read(OutputHandler handler)	Read output until: A null line is read. Handler returns false when line is read. Since command process will not be closed, a simple string is returned (an exit status cannot be computed).
void	write(Iterable<String> inputs)	Write set of inputs to the current process.
void	write(String input, String... others)	Write input string to the current process.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultCommandProcess

public DefaultCommandProcess(InputStream is,
                             OutputStream os,
                             InputStream err)

Create process.

Parameters:

is - Input stream.

os - Output stream.

err - Error stream.

Method Detail

read

public String read()
            throws IOException

Description copied from interface: CommandProcess

Read output until a null line is read.
Since command process will not be closed, a simple string is returned (an exit status cannot be computed).

Specified by:

read in interface CommandProcess

Returns:

Command result.

Throws:

IOException - If an error occurred during operation.

read

public String read(OutputHandler handler)
            throws IOException

Description copied from interface: CommandProcess

Read output until:

• A null line is read.
• Handler returns false when line is read.

Since command process will not be closed, a simple string is returned (an exit status cannot be computed).

Specified by:

read in interface CommandProcess

Parameters:

handler - Output handler.

Returns:

Full output.

Throws:

IOException - If an error occurred during operation.

write

public void write(String input,
                  String... others)
           throws IOException

Description copied from interface: CommandProcess

Write input string to the current process.

Specified by:

write in interface CommandProcess

Parameters:

input - Input.

others - Other inputs.

Throws:

IOException - If an error occurred during operation.

write

public void write(Iterable<String> inputs)
           throws IOException

Description copied from interface: CommandProcess

Write set of inputs to the current process.

Specified by:

write in interface CommandProcess

Parameters:

inputs - Collection of inputs.

Throws:

IOException - If an error occurred during operation.

flush

public void flush()
           throws IOException

Description copied from interface: CommandProcess

Flush pending write operations.

Specified by:

flush in interface CommandProcess

Throws:

IOException - If an error occurred during operation.

isRunning

public boolean isRunning()

Description copied from interface: CommandProcess

Check if current process is still opened. If this method returns true, then CommandProcess.isClosed() should return false.

Specified by:

isRunning in interface CommandProcess

Returns:

true if process is open, false otherwise.

isClosed

public boolean isClosed()

Description copied from interface: CommandProcess

Check if current process has been closed. If this method returns true, then CommandProcess.isRunning() should return false.

Specified by:

isClosed in interface CommandProcess

Returns:

true if process is closed, false otherwise.

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception