uk.ac.starlink.table.storage

Class ByteStoreStoragePolicy

java.lang.Object

uk.ac.starlink.table.StoragePolicy

uk.ac.starlink.table.storage.ByteStoreStoragePolicy

public abstract class ByteStoreStoragePolicy
extends StoragePolicy

Abstract StoragePolicy implementation based on a ByteStore. The attemptMakeByteStore() method must be implemented, and the other methods are implemented in terms of that.

Since:

5 Nov 2009

Author:

Mark Taylor

Field Summary

Fields inherited from class uk.ac.starlink.table.StoragePolicy

ADAPTIVE, DISCARD, PREF_PROPERTY, PREFER_DISK, PREFER_MEMORY, SIDEWAYS

Constructor Summary

Constructors

Constructor and Description
ByteStoreStoragePolicy()

Method Summary

Modifier and Type	Method and Description
protected abstract ByteStore	attemptMakeByteStore() Returns a ByteStore object to hold data.
ByteStore	makeByteStore() Returns a new ByteStore object which can be used to provide a destination for general purpose data storage.
RowStore	makeConfiguredRowStore(StarTable meta) Creates a new RowStore and primes it by calling TableSink.acceptMetadata(uk.ac.starlink.table.StarTable) on it.
RowStore	makeRowStore() Returns a new RowStore object which can be used to provide a destination for random-access table storage.

Methods inherited from class uk.ac.starlink.table.StoragePolicy

copyTable, getDefaultPolicy, randomTable, setDefaultPolicy

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ByteStoreStoragePolicy

public ByteStoreStoragePolicy()

Method Detail

attemptMakeByteStore

protected abstract ByteStore attemptMakeByteStore()
                                           throws IOException

Returns a ByteStore object to hold data. If an exception is thrown, this implementation will fall back to memory-based techniques.

Returns:

new byte store

Throws:

IOException

makeByteStore

public ByteStore makeByteStore()

Description copied from class: StoragePolicy

Returns a new ByteStore object which can be used to provide a destination for general purpose data storage.

Specified by:

makeByteStore in class StoragePolicy

Returns:

new byte store

makeRowStore

public RowStore makeRowStore()

Description copied from class: StoragePolicy

Returns a new RowStore object which can be used to provide a destination for random-access table storage.

Specified by:

makeRowStore in class StoragePolicy

Returns:

a RowStore object

makeConfiguredRowStore

public RowStore makeConfiguredRowStore(StarTable meta)

Description copied from class: StoragePolicy

Creates a new RowStore and primes it by calling TableSink.acceptMetadata(uk.ac.starlink.table.StarTable) on it.

Specified by:

makeConfiguredRowStore in class StoragePolicy

Parameters:

meta - template giving the metadata which describes the rows that will have to be stored

Returns:

a RowStore on which acceptMetadata(meta) has been called