org.apfloat.internal
Class FloatDiskDataStorage

java.lang.Object
  org.apfloat.spi.DataStorage
      org.apfloat.internal.DiskDataStorage
          org.apfloat.internal.FloatDiskDataStorage

All Implemented Interfaces:

Serializable

public final class FloatDiskDataStorage
extends DiskDataStorage

Disk-based data storage for the float element type.

Version:

1.4.2

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

	FloatDiskDataStorage() Default constructor.
protected	FloatDiskDataStorage(FloatDiskDataStorage floatDiskDataStorage, long offset, long length) Subsequence constructor.

Method Summary

protected int	getUnitSize() Size of the element type, in bytes.
protected ArrayAccess	implGetArray(int mode, long offset, int length) Gets an array access to the data of this data storage.
protected ArrayAccess	implGetTransposedArray(int mode, int startColumn, int columns, int rows) Maps a transposed block of data to a memory array.
protected DataStorage	implSubsequence(long offset, long length) Implementation of getting a subsequence of this data storage.
DataStorage.Iterator	iterator(int mode, long startPosition, long endPosition) Constructs a new iterator.

Methods inherited from class org.apfloat.internal.DiskDataStorage

getBlockSize, getFileChannel, getFilename, implCopyFrom, implGetSize, implSetSize, transferFrom, transferTo

Methods inherited from class org.apfloat.spi.DataStorage

copyFrom, copyFrom, 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 Detail

FloatDiskDataStorage

public FloatDiskDataStorage()
                     throws ApfloatRuntimeException

Default constructor.

Throws:

ApfloatRuntimeException

FloatDiskDataStorage

protected FloatDiskDataStorage(FloatDiskDataStorage floatDiskDataStorage,
                               long offset,
                               long length)

Subsequence constructor.

Parameters:

floatDiskDataStorage - The originating data storage.

offset - The subsequence starting position.

length - The subsequence length.

Method Detail

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

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. 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

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. 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

getUnitSize

protected int getUnitSize()

Description copied from class: DiskDataStorage

Size of the element type, in bytes.

Specified by:

getUnitSize in class DiskDataStorage

Returns:

Size of the element type, in bytes.