Package org.apfloat.internal

Class AbstractDataStorageBuilder

java.lang.Object

org.apfloat.internal.AbstractDataStorageBuilder

All Implemented Interfaces:

DataStorageBuilder

Direct Known Subclasses:

DoubleDataStorageBuilder, FloatDataStorageBuilder, IntDataStorageBuilder, LongDataStorageBuilder

public abstract class AbstractDataStorageBuilder
extends Object
implements DataStorageBuilder

Abstract base class for a data storage creation strategy. Depending on the implementation-specific element size, the requested data length and threshold values configured in the current ApfloatContext, different types of data storages are created.

Since:

1.7.0

Version:

1.8.2

Author:

Mikko Tommila

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractDataStorageBuilder()	Subclass constructor.

Method Summary

Modifier and Type	Method	Description
protected abstract DataStorage	createCachedDataStorage()	Create a cached data storage.
DataStorage	createCachedDataStorage(long size)	Get a data storage that is cached in memory, if possible, for the requested size of data.
DataStorage	createDataStorage(long size)	Get an appropriate type of data storage for the requested size of data.
DataStorage	createDataStorage(DataStorage dataStorage)	Convert cached data storage to the appropriate normal data storage type.
protected abstract DataStorage	createNonCachedDataStorage()	Create a non-cached data storage.
protected abstract long	getMaxCachedSize()	Get the maximum cached data storage size.
protected abstract boolean	isCached(DataStorage dataStorage)	Test if the data storage is of cached type.

Methods inherited from class java.lang.Object

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

Constructor Details

AbstractDataStorageBuilder

protected AbstractDataStorageBuilder()

Subclass constructor.

Method Details

createDataStorage

public DataStorage createDataStorage(long size)
                              throws ApfloatRuntimeException

Description copied from interface: DataStorageBuilder

Get an appropriate type of data storage for the requested size of data.

Note that the returned data storage object is not set to have the requested size, so the client should call the object's DataStorage.setSize(long) method before storing data to it.

Specified by:

createDataStorage in interface DataStorageBuilder

Parameters:

size - The size of data to be stored in the storage, in bytes.

Returns:

An empty DataStorage object of an appropriate type for storing size bytes of data.

Throws:

ApfloatRuntimeException

createCachedDataStorage

public DataStorage createCachedDataStorage(long size)
                                    throws ApfloatRuntimeException

Description copied from interface: DataStorageBuilder

Get a data storage that is cached in memory, if possible, for the requested size of data.

Note that the returned data storage object is not set to have the requested size, so the client should call the object's DataStorage.setSize(long) method before storing data to it.

Specified by:

createCachedDataStorage in interface DataStorageBuilder

Parameters:

size - The size of data to be stored in the storage, in bytes.

Returns:

An empty DataStorage object of an appropriate type for storing size bytes of data, cached if possible.

Throws:

ApfloatRuntimeException

createDataStorage

public DataStorage createDataStorage(DataStorage dataStorage)
                              throws ApfloatRuntimeException

Description copied from interface: DataStorageBuilder

Convert cached data storage to the appropriate normal data storage type.

If the data storage already has the appropriate type for its size, the data storage may be returned unchanged. The argument data storage does not necessarily have to be created with the DataStorageBuilder.createCachedDataStorage(long) method, it can be created as well with the DataStorageBuilder.createDataStorage(long) method.

If the given data storage does not have the appropriate type for its size, then a new data storage of the appropriate type is created and the data is copied to it.

Specified by:

createDataStorage in interface DataStorageBuilder

Parameters:

dataStorage - The data storage to be converted, if necessary.

Returns:

A DataStorage that can be the original data storage or a copy of it, with the appropriate type.

Throws:

ApfloatRuntimeException

getMaxCachedSize

protected abstract long getMaxCachedSize()

Get the maximum cached data storage size.

Returns:

The maximum cached data storage size.

createCachedDataStorage

protected abstract DataStorage createCachedDataStorage()
                                                throws ApfloatRuntimeException

Create a cached data storage.

Returns:

A new cached data storage.

Throws:

ApfloatRuntimeException

createNonCachedDataStorage

protected abstract DataStorage createNonCachedDataStorage()
                                                   throws ApfloatRuntimeException

Create a non-cached data storage.

Returns:

A new non-cached data storage.

Throws:

ApfloatRuntimeException

isCached

protected abstract boolean isCached(DataStorage dataStorage)
                             throws ApfloatRuntimeException

Test if the data storage is of cached type.

Parameters:

dataStorage - The data storage.

Returns:

If the data storage is cached.

Throws:

ApfloatRuntimeException