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Java Source Code / Java Documentation » Parser » JTopas » de.susebox.java.lang

Source Cross Reference Class Diagram Java Document (Java Doc)

de.susebox.java.lang .Environment

All known Subclasses:   de.susebox.java.lang .DefaultEnvironment,
Environment
public interface Environment (Code)

A Environment object is a substitute for the usual environment as defined in the java.lang.System class, most important the stdin and stdout channels java.lang.System.in and java.lang.System.out .
Environments are especially useful in classes that can be used both standalone (having a main method) or in an application where the class is only one of many. Another scenario would be a simple class designed for use from the command line that should suddenly be invoked in GUI framework without redirecting the default channels java.lang.System.in and java.lang.System.out .
To obtain an Environment instance or to store such instances use the class EnvironmentProvider :
Environment env = EnvironmentProvider.getEnvironment(this);

author:
   Heiko Blau

Method Summary
public PrintStream err()
     This method returns the substitution for java.lang.System.err , the standard error channel.
public void exit()
     This method exits the instance of its Environment implementation. After calling exit the Environment instance is generally not any longer usable.
public int getExitStatus()
     Retrieving the currently set exit code.
public InputStream in()
     This method returns the substitution for java.lang.System.in , the standard input channel.
public PrintStream out()
     This method returns the substitution for java.lang.System.out , the standard output channel.
public void setExitStatus(int status)
     During different stages of program execution various exit codes can be set using this method.

Method Detail
err
public PrintStream err() throws UnsupportedOperationException(Code)
This method returns the substitution for java.lang.System.err , the standard error channel. Instead of a public member like in the System class, we prefer the method version since it is more flexible. the java.io.PrintStream that serves as standard error output
throws:
  UnsupportedOperationException - if there is no stderr channel available
See Also:   java.lang.System.err

exit
public void exit() throws UnsupportedOperationException(Code)
This method exits the instance of its Environment implementation. After calling exit the Environment instance is generally not any longer usable. In particular, an implementation can choose to call java.lang.System.exit .
throws:
  UnsupportedOperationException - if the method is not available
See Also:   Environment.setExitStatus
See Also:   java.lang.System.exit

getExitStatus
public int getExitStatus()(Code)
Retrieving the currently set exit code. the currently set exit code of an application

in
public InputStream in() throws UnsupportedOperationException(Code)
This method returns the substitution for java.lang.System.in , the standard input channel. Instead of a public member like in the System class, we prefer the method version since it is more flexible. the java.io.InputStream that serves as standard input
throws:
  UnsupportedOperationException - if there is no stdin channel available
See Also:   java.lang.System.in

out
public PrintStream out() throws UnsupportedOperationException(Code)
This method returns the substitution for java.lang.System.out , the standard output channel. Instead of a public member like in the System class, we prefer the method version since it is more flexible. the java.io.PrintStream that serves as standard output
throws:
  UnsupportedOperationException - if there is no stdout channel available
See Also:   java.lang.System.out

setExitStatus
public void setExitStatus(int status)(Code)
During different stages of program execution various exit codes can be set using this method. For instance, a program may set the exit code to a positive number indicating that it is still running. A negative exit code may stand for errors while 0 is the usual OK code.
Parameters:
  status - the exit code of an application
See Also:   java.lang.System.exit
See Also:   Environment.getExitStatus
See Also:   Environment.exit

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