Package uk.ac.starlink.ttools.plot2.data
Class SimpleDataStoreFactory
- java.lang.Object
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- uk.ac.starlink.ttools.plot2.data.SimpleDataStoreFactory
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- All Implemented Interfaces:
DataStore
,DataStoreFactory
public class SimpleDataStoreFactory extends java.lang.Object implements DataStoreFactory, DataStore
DataStoreFactory implementation that does no caching. It reads the data as required every time. This has low memory requirements. It may also be faster to use for one-pass plots, but probably not if the same column is used for multiple purposes.- Since:
- 11 Feb 2013
- Author:
- Mark Taylor
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Constructor Summary
Constructors Constructor Description SimpleDataStoreFactory()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description TupleSequence
getTupleSequence(DataSpec spec)
Returns the data described by a given DataSpec as a sequence of tuples.static uk.ac.starlink.table.DomainMapper[]
getUserCoordMappers(DataSpec dataSpec, int icoord)
Utility method to work out the domain mappers for a given coordinate of a DataSpec.boolean
hasData(DataSpec spec)
Indicates whether this store has the data described by a given DataSpec.DataStore
readDataStore(DataSpec[] specs, DataStore prevStore)
Executes instantly and returns this object.
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Method Detail
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hasData
public boolean hasData(DataSpec spec)
Description copied from interface:DataStore
Indicates whether this store has the data described by a given DataSpec.
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readDataStore
public DataStore readDataStore(DataSpec[] specs, DataStore prevStore)
Executes instantly and returns this object.- Specified by:
readDataStore
in interfaceDataStoreFactory
- Parameters:
specs
- data specifications; some elements may be nullprevStore
- previously obtained DataStore, or null- Returns:
- new data store
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getTupleSequence
public TupleSequence getTupleSequence(DataSpec spec)
Description copied from interface:DataStore
Returns the data described by a given DataSpec as a sequence of tuples. Must only be called ifDataStore.hasData(uk.ac.starlink.ttools.plot2.data.DataSpec)
returns true for the given DataSpec; if not, behaviour is undefined.- Specified by:
getTupleSequence
in interfaceDataStore
- Parameters:
spec
- plot data specification object- Returns:
- sequence of values which can be used to perform a plot
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getUserCoordMappers
public static uk.ac.starlink.table.DomainMapper[] getUserCoordMappers(DataSpec dataSpec, int icoord)
Utility method to work out the domain mappers for a given coordinate of a DataSpec. For the requested coord, it returns a mapper array with elements filled, in with any mapper known for the given input coordinates that has the sub-type appropriate for that coordinate.- Parameters:
dataSpec
- data specification objecticoord
- index of coordinate indataSpec
- Returns:
- mapper array for decoding values of one coordinate of a data spec
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