Package org.apfloat.internal

Class DoubleMemoryDataStorage

java.lang.Object

org.apfloat.spi.DataStorage

org.apfloat.internal.DoubleMemoryDataStorage

All Implemented Interfaces:

Serializable

public class DoubleMemoryDataStorage
extends DataStorage

Memory based data storage implementation for the double element type.

Version:

1.9.0

Author:

Mikko Tommila

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apfloat.spi.DataStorage

DataStorage.AbstractIterator, DataStorage.Iterator

Field Summary

Fields inherited from class org.apfloat.spi.DataStorage

READ, READ_WRITE, WRITE

Constructor Summary

Constructors

Modifier	Constructor	Description
	DoubleMemoryDataStorage()	Default constructor.
protected	DoubleMemoryDataStorage(DoubleMemoryDataStorage doubleMemoryDataStorage, long offset, long length)	Subsequence constructor.

Method Summary

Modifier and Type	Method	Description
protected void	implCopyFrom(DataStorage dataStorage, long size)	Copies the specified number of elements from another data storage to this data storage.
protected ArrayAccess	implGetArray(int mode, int startColumn, int columns, int rows)	Maps a block of data to a memory array when the data is treated as a matrix.
protected ArrayAccess	implGetArray(int mode, long offset, int length)	Gets an array access to the data of this data storage when it is treated as a linear block.
protected long	implGetSize()	Return the size of the whole data storage, not including sub-sequence settings.
protected ArrayAccess	implGetTransposedArray(int mode, int startColumn, int columns, int rows)	Maps a transposed block of data to a memory array when the data is treated as a matrix.
protected void	implSetSize(long size)	Sets the size of the data storage.
protected DataStorage	implSubsequence(long offset, long length)	Implementation of getting a subsequence of this data storage.
boolean	isCached()	Is this object cached in memory.
DataStorage.Iterator	iterator(int mode, long startPosition, long endPosition)	Constructs a new iterator.

Methods inherited from class org.apfloat.spi.DataStorage

copyFrom, copyFrom, getArray, getArray, getOffset, getSize, getTransposedArray, isReadOnly, isSubsequenced, setReadOnly, setSize, subsequence

Methods inherited from class java.lang.Object

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

Constructor Details

DoubleMemoryDataStorage

public DoubleMemoryDataStorage()

Default constructor.

DoubleMemoryDataStorage

protected DoubleMemoryDataStorage(DoubleMemoryDataStorage doubleMemoryDataStorage,
 long offset,
 long length)

Subsequence constructor.

Parameters:

doubleMemoryDataStorage - The originating data storage.

offset - The subsequence starting position.

length - The subsequence length.

Method Details

isCached

public boolean isCached()

Description copied from class: DataStorage

Is this object cached in memory.

Specified by:

isCached in class DataStorage

Returns:

true if this object is cached in memory, false if not.

implSubsequence

protected DataStorage implSubsequence(long offset,
 long length)
                               throws ApfloatRuntimeException

Description copied from class: DataStorage

Implementation of getting a subsequence of this data storage. The validity of the arguments of this method do not need to be checked.

Specified by:

implSubsequence in class DataStorage

Parameters:

offset - The subsequence starting position.

length - The subsequence length.

Returns:

Data storage that represents the specified part of this data storage.

Throws:

ApfloatRuntimeException

implCopyFrom

protected void implCopyFrom(DataStorage dataStorage,
 long size)
                     throws ApfloatRuntimeException

Description copied from class: DataStorage

Copies the specified number of elements from another data storage to this data storage. The validity of the arguments of this method do not need to be checked.

Specified by:

implCopyFrom in class DataStorage

Parameters:

dataStorage - The data storage where the data should be copied from.

size - The number of elements to be copied.

Throws:

ApfloatRuntimeException

implGetSize

protected long implGetSize()

Description copied from class: DataStorage

Return the size of the whole data storage, not including sub-sequence settings.

Specified by:

implGetSize in class DataStorage

Returns:

The size of the whole data storage, not including sub-sequence settings.

implSetSize

protected void implSetSize(long size)
                    throws ApfloatRuntimeException

Description copied from class: DataStorage

Sets the size of the data storage. The validity of the arguments of this method do not need to be checked.

Specified by:

implSetSize in class DataStorage

Parameters:

size - The size of the data storage.

Throws:

ApfloatRuntimeException

implGetArray

protected ArrayAccess implGetArray(int mode,
 long offset,
 int length)
                            throws ApfloatRuntimeException

Description copied from class: DataStorage

Gets an array access to the data of this data storage when it is treated as a linear block. The validity of the arguments of this method do not need to be checked.

Specified by:

implGetArray in class DataStorage

Parameters:

mode - Access mode for the array access: DataStorage.READ, DataStorage.WRITE or both.

offset - Starting position of the array access in the data storage.

length - Number of accessible elements in the array access.

Returns:

The array access.

Throws:

ApfloatRuntimeException

implGetArray

protected ArrayAccess implGetArray(int mode,
 int startColumn,
 int columns,
 int rows)
                            throws ApfloatRuntimeException

Description copied from class: DataStorage

Maps a block of data to a memory array when the data is treated as a matrix. The validity of the arguments of this method do not need to be checked.

Specified by:

implGetArray in class DataStorage

Parameters:

mode - Whether the array is prepared for reading, writing or both. The value should be DataStorage.READ, DataStorage.WRITE or a combination of these.

startColumn - The starting column where data is read.

columns - The number of columns of data to read.

rows - The number of rows of data to read. This should be equivalent to n₁, number of rows in the matrix.

Returns:

Access to an array of size columns x rows containing the data.

Throws:

ApfloatRuntimeException

implGetTransposedArray

protected ArrayAccess implGetTransposedArray(int mode,
 int startColumn,
 int columns,
 int rows)
                                      throws ApfloatRuntimeException

Description copied from class: DataStorage

Maps a transposed block of data to a memory array when the data is treated as a matrix. The validity of the arguments of this method do not need to be checked.

Specified by:

implGetTransposedArray in class DataStorage

Parameters:

mode - Whether the array is prepared for reading, writing or both. The value should be DataStorage.READ, DataStorage.WRITE or a combination of these.

startColumn - The starting column where data is read.

columns - The number of columns of data to read.

rows - The number of rows of data to read. This should be equivalent to n₁, number of rows in the matrix.

Returns:

Access to an array of size columns x rows containing the transposed data.

Throws:

ApfloatRuntimeException

iterator

public DataStorage.Iterator iterator(int mode,
 long startPosition,
 long endPosition)
                              throws IllegalArgumentException,
IllegalStateException,
ApfloatRuntimeException

Description copied from class: DataStorage

Constructs a new iterator. Elements can be iterated either in forward or in reverse order, depending on if startPosition is less than or greater than endPosition, correspondingly.

Specified by:

iterator in class DataStorage

Parameters:

mode - Access mode for iterator: DataStorage.READ, DataStorage.WRITE or both.

startPosition - Starting position of iterator in the data set. For reverse access, the first element in the iterator is startPosition - 1.

endPosition - End position of iterator in the data set. For forward access, the last accessible element in the iterator is endPosition - 1.

Returns:

An iterator.

Throws:

IllegalArgumentException - If the requested area is out of bounds of the data storage.

IllegalStateException - If write access is requested for a read-only data storage.

ApfloatRuntimeException