Package uk.ac.starlink.topcat.activate
Class Downloader<T>
- java.lang.Object
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- uk.ac.starlink.topcat.activate.Downloader<T>
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public class Downloader<T> extends java.lang.Object
Manages download of data that may be required in multiple places.- Since:
- 24 Oct 2019
- Author:
- Mark Taylor
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Constructor Summary
Constructors Constructor Description Downloader(java.lang.String dataDescription, java.util.concurrent.Callable<T> supplier)
Constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
addActionListener(java.awt.event.ActionListener l)
Adds a listener that will be notified when the data has become available.T
getData()
Immediately returns the downloaded data, or null if it has not been downloaded, or if a download has failed.void
removeActionListener(java.awt.event.ActionListener l)
Removes a listener previously added.void
start()
Ensures that this downloader has started to downloading the data.
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Constructor Detail
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Downloader
public Downloader(java.lang.String dataDescription, java.util.concurrent.Callable<T> supplier)
Constructor.- Parameters:
dataDescription
- short description of downloaded data, may be used in logging messagessupplier
- supplier of downloaded data
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Method Detail
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start
public void start()
Ensures that this downloader has started to downloading the data. If it has already started (and possibly finished), this has no effect.
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getData
public T getData()
Immediately returns the downloaded data, or null if it has not been downloaded, or if a download has failed.- Returns:
- downloaded result, or null
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addActionListener
public void addActionListener(java.awt.event.ActionListener l)
Adds a listener that will be notified when the data has become available.- Parameters:
l
- listener
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removeActionListener
public void removeActionListener(java.awt.event.ActionListener l)
Removes a listener previously added.- Parameters:
l
- listener
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