SimpleDataStoreFactory (Starjava TTOOLS API)

java.lang.Object
- uk.ac.starlink.ttools.plot2.data.SimpleDataStoreFactory

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

Constructor Summary

Constructors
Constructor and Description

SimpleDataStoreFactory()

Constructors
Constructor and Description
`SimpleDataStoreFactory()`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and 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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SimpleDataStoreFactory
```
public SimpleDataStoreFactory()
```
- Method Detail
  - hasData
```
public boolean hasData(DataSpec spec)
```
    Description copied from interface: DataStore
    
    Indicates whether this store has the data described by a given DataSpec.
    
    Specified by:
    
    hasData in interface DataStore
    
    Parameters:
    
    spec - plot data specification object
  - readDataStore
```
public DataStore readDataStore(DataSpec[] specs,
                               DataStore prevStore)
```
    Executes instantly and returns this object.
    
    Specified by:
    
    readDataStore in interface DataStoreFactory
    
    Parameters:
    
    specs - data specifications; some elements may be null
    
    prevStore - previously obtained DataStore, or null
    
    Returns:
    
    new data store
  - 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 if DataStore.hasData(uk.ac.starlink.ttools.plot2.data.DataSpec) returns true for the given DataSpec; if not, behaviour is undefined.
    
    Specified by:
    
    getTupleSequence in interface DataStore
    
    Parameters:
    
    spec - plot data specification object
    
    Returns:
    
    sequence of values which can be used to perform a plot
  - 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 object
    
    icoord - index of coordinate in dataSpec
    
    Returns:
    
    mapper array for decoding values of one coordinate of a data spec

Class SimpleDataStoreFactory

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

SimpleDataStoreFactory

Method Detail

hasData

readDataStore

getTupleSequence

getUserCoordMappers