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Java Source Code / Java Documentation » GIS » udig 1.1 » net.refractions.udig.project.command

Source Cross Reference

Class Diagram

Java Document (Java Doc)

net.refractions.udig.project.command .Command

All known Subclasses:   net.refractions.udig.tools.edit.commands .SetGeomCommand,  net.refractions.udig.tools.edit.commands .RemoveSelectedVerticesCommand,
Command
public interface Command (Code)
A MapCommand in uDig describes an action that modifies the system's model.
Commands are single fire objects. They cannot be used more than once. This is to allow undoable commands to be a normal command, not a special case command.

Commands normally have factories associated with them, but they are also prototypes. The copy method returns a new MapCommand without the undo data. The new MapCommand can safely be executed with no negative side-effects.

See Also:   net.refractions.udig.project.command.factory.NavigationCommandFactory
See Also:    A set of possible command
See Also:   categories are: zoom, pan, cut, paste, addVertex, etc.. Most commands are associated with
See Also:   tool whose job is to construct the commands. A MapCommand object describes an concrete
See Also:   change, for example: setBBox(0,0,1,1); setBBox(2,2,3,3) would be a seperate object.
author:
   jeichar

Method Summary
public Command copy()
     Instantiates a new copy of the command that will operate in the same manner as the original command.
public String getName()

public void run(IProgressMonitor monitor)
     The method that performs the work of the command.
Run is called by UDIG when the command is received.

Method Detail
copy
public Command copy()(Code)
Instantiates a new copy of the command that will operate in the same manner as the original command. API isn't this cloneable? A copy of the current command. The new command must run the same way as the currentobject.
If the current command has already executed it cannot be used again, but a copy maybecause a copy should contain none of the state side-effect that execution has on acommand

getName
public String getName()(Code)
Returns the name of the MapCommand The name of the command.

run
public void run(IProgressMonitor monitor) throws Exception(Code)
The method that performs the work of the command.
Run is called by UDIG when the command is received. Commands are run in a seperate thread.

Parameters:
  monitor - A progress monitor used by the command to report on its internal state. APIhow is this associated with a Thread? is it a Thread?
throws:
  Exception -

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