Package jebl.util
Class CompositeProgressListener
java.lang.Object
jebl.util.ProgressListener
jebl.util.CompositeProgressListener
- All Implemented Interfaces:
Cancelable
A
ProgressListener
that is suitable for a task that consists of several subtasks.
You specify the relative duration of each subtask, and then the subtasks' setProgress()
calls with values between 0 and 1 are translated to reflect the overall progress on the whole
(combined) task. In other words, each subtask reports progress as if it were the whole task,
and the CompositeProgressListener translates this into overall progress. This also implies
that calling setComplete()
or setProgress(1.0)
marks the current subtask rather than the entire task completed.
As the combined progress listener cannot know which subtask it is currently being called from,
you have to explicitely let it know when a new subtask (not the first) starts, by calling
beginNextSubtask()
. Thus when the constructor is passed an array of N doubles as its second
argument, beginNextSubtask()
should be called precisely N-1 times.
Alternatively, instead of calling beginNextSubtask()
after each subtask (except the last),
you can instead call beginSubtask()
before each subtask (including the first).
- Version:
- $Id: CompositeProgressListener.java 1068 2010-09-08 23:59:59Z matt_kearse $
- Author:
- Tobias Thierer
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Nested Class Summary
Nested classes/interfaces inherited from class jebl.util.ProgressListener
ProgressListener.Wrapper
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Field Summary
Fields inherited from class jebl.util.ProgressListener
EMPTY
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Constructor Summary
ConstructorsConstructorDescriptionCompositeProgressListener
(ProgressListener listener, double... operationDuration) construct a new composite ProgressListener.CompositeProgressListener
(ProgressListener listener, int numberOfEvenlyWeightedSubTasks) Construct a CompositeProgressListener with a number of evenly weighted subtasks. -
Method Summary
Modifier and TypeMethodDescriptionvoid
addFeedbackAction
(String label, String description, SimpleListener listener) Adds an action that can choose to provide feedback.void
addFeedbackAction
(String label, SimpleListener listener) Equivalent toaddFeedbackAction(label,"",listener)
boolean
addProgress
(double fractionCompletedDiff) Increments the progress of the current sub task by this much.void
begins the next subtask.void
beginNextSubtask
(String message) Convenience method to start the next operation AND set a new message.void
Used as an alternative tobeginNextSubtask()
.void
beginSubtask
(String message) Used as an alternative tobeginNextSubtask()
.void
Clear all progress, including that of previous subtasks.static CompositeProgressListener
forFiles
(ProgressListener listener, List<File> files) boolean
boolean
This method must be implemented by all subclasses.void
removeFeedbackAction
(String label) Removes a feedback action previously added usingProgressListener.addFeedbackAction(String, jebl.util.SimpleListener)
.final boolean
void
Sets a title associated with whatever is being done.Methods inherited from class jebl.util.ProgressListener
setImage, setIndeterminateProgress, setMessage, setProgress, setProgress, setProgress
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Constructor Details
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CompositeProgressListener
construct a new composite ProgressListener.- Parameters:
listener
- the ProgressListener that all progress reports are forwarded to after adjusting them for the currently active sub-taskoperationDuration
- a list of relative weightings to give each sub task.
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CompositeProgressListener
Construct a CompositeProgressListener with a number of evenly weighted subtasks.- Parameters:
listener
- the ProgressListener that all progress reports are forwarded to after adjusting them for the currently active sub-tasknumberOfEvenlyWeightedSubTasks
- the number of evenly weighted sub-tasks.
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Method Details
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forFiles
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beginSubtask
public void beginSubtask()Used as an alternative tobeginNextSubtask()
. Instead of callingbeginNextSubtask()
once after each subtask (except the last), you can instead call beginSubTask at the beginning of every subtask including the first. -
beginSubtask
Used as an alternative tobeginNextSubtask()
. Instead of callingbeginNextSubtask()
once after each subtask (except the last), you can instead call beginSubTask at the beginning of every subtask including the first.- Parameters:
message
- a message to be displayed to the user as a prefix in the progress message
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isCanceled
public boolean isCanceled()Description copied from class:ProgressListener
This method must be implemented by all subclasses. It is called fromProgressListener.setProgress(double)
,ProgressListener.setIndeterminateProgress()
andProgressListener.setMessage(java.lang.String)
to determine the return value of these methods.- Specified by:
isCanceled
in interfaceCancelable
- Specified by:
isCanceled
in classProgressListener
- Returns:
- true if the user has requested that this operation be canceled.
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addProgress
public boolean addProgress(double fractionCompletedDiff) Increments the progress of the current sub task by this much. Using this method is generally a bad idea. UseProgressListener.setProgress(double)
instead.- Parameters:
fractionCompletedDiff
- the amount ot increase the current progress by between 0 and 1.- Returns:
- true if canceled.
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hasNextSubtask
public boolean hasNextSubtask()- Returns:
- true if there is another subtask available after the current one
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clearAllProgress
public void clearAllProgress()Clear all progress, including that of previous subtasks. Note: if the task has already been canceled, this does not reset its status to non-canceled. -
beginNextSubtask
Convenience method to start the next operation AND set a new message.- Parameters:
message
- message to set (will be passed to setMessage()
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beginNextSubtask
public void beginNextSubtask()begins the next subtask. Should not be called on the first subtask, but should only be called to start tasks after the first one. If you wish to call a begin subtask method for each task including the first, usebeginSubtask()
instead. -
setComplete
public final boolean setComplete() -
getRootProgressListener
- Returns:
- The root
ProgressListener
that this forwards adjusted progress reports to.
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addFeedbackAction
Description copied from class:ProgressListener
Equivalent toaddFeedbackAction(label,"",listener)
- Overrides:
addFeedbackAction
in classProgressListener
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addFeedbackAction
Description copied from class:ProgressListener
Adds an action that can choose to provide feedback. For example, an operation may choose to provide a "Skip to next step" button alongside the cancel button. There is no requirement that a ProgressListener actually present this to the user - it may choose to ignore this method, in which caselistener
will never be fired.- Overrides:
addFeedbackAction
in classProgressListener
- Parameters:
label
- a label describing this feedback action. For example, "Skip to next step"listener
- a listener to be notified when the user chooses to invoke this action
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removeFeedbackAction
Description copied from class:ProgressListener
Removes a feedback action previously added usingProgressListener.addFeedbackAction(String, jebl.util.SimpleListener)
.- Overrides:
removeFeedbackAction
in classProgressListener
- Parameters:
label
- The label used as a parameter toProgressListener.addFeedbackAction(String, jebl.util.SimpleListener)
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setTitle
Description copied from class:ProgressListener
Sets a title associated with whatever is being done. This will not necessarily even be presented to the user, but typically will be presented as the title of a progress window.- Overrides:
setTitle
in classProgressListener
- Parameters:
title
- the title of a progress window (if any). Must not be null.
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