uk.ac.starlink.topcat.plot2
Class GuiDataStore

java.lang.Object
  extended by uk.ac.starlink.topcat.plot2.GuiDataStore
All Implemented Interfaces:
uk.ac.starlink.ttools.plot2.data.DataStore

public class GuiDataStore
extends Object
implements uk.ac.starlink.ttools.plot2.data.DataStore

DataStore wrapper implementation suitable for use from a GUI application. This wrapper does two things.

First, it checks for thread interruptions regularly, and stops dispensing tuples from the data store if in case of interruption. The thread interruption status is undisturbed, and clients should in general check the interuption status of the thread following use of an instance of this class.

Second, it optionally updates a progress bar as tuples are read. For this to work, it needs to know up front (at least a guess for) how many tuples will be read in total over the lifetime of the store.

Since:
15 Nov 2013
Author:
Mark Taylor

Constructor Summary
GuiDataStore(uk.ac.starlink.ttools.plot2.data.DataStore base)
          Constructs a data store that checks for interruptions.
GuiDataStore(uk.ac.starlink.ttools.plot2.data.DataStore base, BoundedRangeModel progModel, long tupleCount)
          Constructs a data store that checks for interruptions and optionally reports progress.
 
Method Summary
 uk.ac.starlink.ttools.plot2.data.TupleSequence getTupleSequence(uk.ac.starlink.ttools.plot2.data.DataSpec dataSpec)
           
 boolean hasData(uk.ac.starlink.ttools.plot2.data.DataSpec dataSpec)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

GuiDataStore

public GuiDataStore(uk.ac.starlink.ttools.plot2.data.DataStore base)
Constructs a data store that checks for interruptions.

Parameters:
base - data store to which most behaviour will be delegated

GuiDataStore

public GuiDataStore(uk.ac.starlink.ttools.plot2.data.DataStore base,
                    BoundedRangeModel progModel,
                    long tupleCount)
Constructs a data store that checks for interruptions and optionally reports progress. If progBar is null or tupleCount is negative, there will be no progress updating, but the interruption handling will still take place.

Parameters:
base - base data store to which most behaviour is delegated
progModel - progress bar model, or null
tupleCount - total number of tuples expected to be read during the life of this data store; -1 may be supplied if not known
Method Detail

hasData

public boolean hasData(uk.ac.starlink.ttools.plot2.data.DataSpec dataSpec)
Specified by:
hasData in interface uk.ac.starlink.ttools.plot2.data.DataStore

getTupleSequence

public uk.ac.starlink.ttools.plot2.data.TupleSequence getTupleSequence(uk.ac.starlink.ttools.plot2.data.DataSpec dataSpec)
Specified by:
getTupleSequence in interface uk.ac.starlink.ttools.plot2.data.DataStore


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