Package uk.ac.starlink.ttools.plot2.data
Interface DataStore
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- All Known Implementing Classes:
SimpleDataStoreFactory
,StepDataStore
public interface DataStore
Contains all the actual data required for a plot. To extract usable data for a plot, a suitableDataSpec
object is also required.Because instances of this class manage the data, by keeping track of the
DataStore
s in an application you can control where the memory is used. All the other objects connected with a plot, for instance thePlotLayer
s andDataSpec
s, are cheap to produce and have small memory footprints, so can be created and destroyed as required. As a rule therefore, DataStore objects should be managed by a single class, and references not kept to them by any other potentially long-lived objects.Obtain an instance of this class from a
DataStoreFactory
.- Since:
- 6 Feb 2013
- Author:
- Mark Taylor
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description TupleSequence
getTupleSequence(DataSpec spec)
Returns the data described by a given DataSpec as a sequence of tuples.boolean
hasData(DataSpec spec)
Indicates whether this store has the data described by a given DataSpec.
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Method Detail
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hasData
boolean hasData(DataSpec spec)
Indicates whether this store has the data described by a given DataSpec.- Parameters:
spec
- plot data specification object
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getTupleSequence
TupleSequence getTupleSequence(DataSpec spec)
Returns the data described by a given DataSpec as a sequence of tuples. Must only be called ifhasData(uk.ac.starlink.ttools.plot2.data.DataSpec)
returns true for the given DataSpec; if not, behaviour is undefined.- Parameters:
spec
- plot data specification object- Returns:
- sequence of values which can be used to perform a plot
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