uk.ac.starlink.ttools.plot2.data
Class CachedDataStoreFactory

java.lang.Object
  extended by uk.ac.starlink.ttools.plot2.data.CachedDataStoreFactory
All Implemented Interfaces:
DataStoreFactory

public class CachedDataStoreFactory
extends Object
implements DataStoreFactory

DataStoreFactory implementation that reads columns and caches them for later use. The actual storage mechanism is provided by an externally supplied CachedColumnFactory.

Since:
11 Feb 2013
Author:
Mark Taylor

Constructor Summary
CachedDataStoreFactory(CachedColumnFactory colFact)
          Constructor.
 
Method Summary
 DataStore readDataStore(DataSpec[] dataSpecs, DataStore prevStore)
          Generates a DataStore capable of supplying the data for a given list of DataSpec objects.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

CachedDataStoreFactory

public CachedDataStoreFactory(CachedColumnFactory colFact)
Constructor.

Parameters:
colFact - object which provides the storage for caching arrays of typed data
Method Detail

readDataStore

public DataStore readDataStore(DataSpec[] dataSpecs,
                               DataStore prevStore)
                        throws IOException,
                               InterruptedException
Description copied from interface: DataStoreFactory
Generates a DataStore capable of supplying the data for a given list of DataSpec objects. The prevStore argument may optionally supply the result of a previous invocation of this method. The implementation may choose to make use of the internal state of such an instance for efficiency, for instance by re-using data that has already been read.

Since the bulk data is managed by the DataStore object, care should be taken about what happens to the DataStore objects supplied to and returned from this method. In particular, code both invoking and implementing this method should usually make sure not to keep a reference to the prevStore argument.

This method may perform the actual reading, and therefore take time. It is not intended to be invoked on the event dispatch thread.

Specified by:
readDataStore in interface DataStoreFactory
Parameters:
dataSpecs - data specifications; some elements may be null
prevStore - previously obtained DataStore, or null
Returns:
new data store
Throws:
IOException
InterruptedException


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