java.nio

Class DoubleBuffer

public abstract class DoubleBuffer extends Buffer implements Comparable<DoubleBuffer>

Since: 1.4

Method Summary
static DoubleBuffer	allocate(int capacity) Allocates a new `DoubleBuffer` object with a given capacity.
double[]	array() Returns the `double` array that backs this buffer.
int	arrayOffset() Returns the offset within this buffer's backing array of the first element.
abstract DoubleBuffer	asReadOnlyBuffer() Creates a new read-only `DoubleBuffer` that shares this buffer's content.
abstract DoubleBuffer	compact() Compacts this buffer.
int	compareTo(DoubleBuffer other) Compares two `DoubleBuffer` objects.
abstract DoubleBuffer	duplicate() Creates a new `DoubleBuffer` that shares this buffer's content.
boolean	equals(Object obj) Checks if this buffer is equal to obj.
DoubleBuffer	get(double[] dst, int offset, int length) This method transfers `double`s from this buffer into the given destination array.
DoubleBuffer	get(double[] dst) This method transfers `double`s from this buffer into the given destination array.
abstract double	get() Reads the `double` at this buffer's current position, and then increments the position.
abstract double	get(int index) Absolute get method.
boolean	hasArray() Tells whether ot not this buffer is backed by an accessible `double` array.
int	hashCode() Calculates a hash code for this buffer.
abstract boolean	isDirect() Tells wether or not this buffer is direct.
abstract ByteOrder	order() Returns the byte order of this buffer.
DoubleBuffer	put(DoubleBuffer src) Writes the content of the the `DoubleBUFFER` src into the buffer.
DoubleBuffer	put(double[] src, int offset, int length) Writes the content of the the `double array` src into the buffer.
DoubleBuffer	put(double[] src) Writes the content of the the `double array` src into the buffer.
abstract DoubleBuffer	put(double b) Writes the `double` at this buffer's current position, and then increments the position.
abstract DoubleBuffer	put(int index, double b) Absolute put method.
abstract DoubleBuffer	slice() Creates a new `DoubleBuffer` whose content is a shared subsequence of this buffer's content.
static DoubleBuffer	wrap(double[] array, int offset, int length) Wraps a `double` array into a `DoubleBuffer` object.
static DoubleBuffer	wrap(double[] array) Wraps a `double` array into a `DoubleBuffer` object.

Method Detail

allocate

public static DoubleBuffer allocate(int capacity)

Allocates a new DoubleBuffer object with a given capacity.

array

public final double[] array()

Returns the double array that backs this buffer.

Throws: ReadOnlyBufferException If this buffer is read-only. UnsupportedOperationException If this buffer is not backed by an accessible array.

arrayOffset

public final int arrayOffset()

Returns the offset within this buffer's backing array of the first element.

Throws: ReadOnlyBufferException If this buffer is read-only. UnsupportedOperationException If this buffer is not backed by an accessible array.

asReadOnlyBuffer

public abstract DoubleBuffer asReadOnlyBuffer()

Creates a new read-only DoubleBuffer that shares this buffer's content.

compact

public abstract DoubleBuffer compact()

Compacts this buffer.

Throws: ReadOnlyBufferException If this buffer is read-only.

compareTo

public int compareTo(DoubleBuffer other)

Compares two DoubleBuffer objects.

Throws: ClassCastException If obj is not an object derived from DoubleBuffer.

duplicate

public abstract DoubleBuffer duplicate()

Creates a new DoubleBuffer that shares this buffer's content.

equals

public boolean equals(Object obj)

Checks if this buffer is equal to obj.

get

public DoubleBuffer get(double[] dst, int offset, int length)

This method transfers doubles from this buffer into the given destination array. Before the transfer, it checks if there are fewer than length doubles remaining in this buffer.

Parameters: dst The destination array offset The offset within the array of the first double to be written; must be non-negative and no larger than dst.length. length The maximum number of bytes to be written to the given array; must be non-negative and no larger than dst.length - offset.

Throws: BufferUnderflowException If there are fewer than length doubles remaining in this buffer. IndexOutOfBoundsException If the preconditions on the offset and length parameters do not hold.

get

public DoubleBuffer get(double[] dst)

This method transfers doubles from this buffer into the given destination array.

Parameters: dst The byte array to write into.

Throws: BufferUnderflowException If there are fewer than dst.length doubles remaining in this buffer.

get

public abstract double get()

Reads the double at this buffer's current position, and then increments the position.

Throws: BufferUnderflowException If there are no remaining doubles in this buffer.

get

public abstract double get(int index)

Absolute get method.

Throws: IndexOutOfBoundsException If index is negative or not smaller than the buffer's limit.

hasArray

public final boolean hasArray()

Tells whether ot not this buffer is backed by an accessible double array.

hashCode

public int hashCode()

Calculates a hash code for this buffer. This is done with long arithmetic, where ** represents exponentiation, by this formula:

s[position()] + 31 + (s[position()+1] + 30)*31**1 + ... +
 (s[limit()-1]+30)*31**(limit()-1)

. Where s is the buffer data, in Double.doubleToLongBits() form Note that the hashcode is dependent on buffer content, and therefore is not useful if the buffer content may change.

Returns: the hash code (casted to int)

isDirect

public abstract boolean isDirect()

Tells wether or not this buffer is direct.

order

public abstract ByteOrder order()

Returns the byte order of this buffer.

put

public DoubleBuffer put(DoubleBuffer src)

Writes the content of the the DoubleBUFFER src into the buffer. Before the transfer, it checks if there is fewer than src.remaining() space remaining in this buffer.

Parameters: src The source data.

Throws: BufferOverflowException If there is insufficient space in this buffer for the remaining doubles in the source buffer. IllegalArgumentException If the source buffer is this buffer. ReadOnlyBufferException If this buffer is read-only.

put

public DoubleBuffer put(double[] src, int offset, int length)

Writes the content of the the double array src into the buffer. Before the transfer, it checks if there is fewer than length space remaining in this buffer.

Parameters: src The array to copy into the buffer. offset The offset within the array of the first byte to be read; must be non-negative and no larger than src.length. length The number of bytes to be read from the given array; must be non-negative and no larger than src.length - offset.

Throws: BufferOverflowException If there is insufficient space in this buffer for the remaining doubles in the source array. IndexOutOfBoundsException If the preconditions on the offset and length parameters do not hold ReadOnlyBufferException If this buffer is read-only.

put

public final DoubleBuffer put(double[] src)

Writes the content of the the double array src into the buffer.

Parameters: src The array to copy into the buffer.

Throws: BufferOverflowException If there is insufficient space in this buffer for the remaining doubles in the source array. ReadOnlyBufferException If this buffer is read-only.

put

public abstract DoubleBuffer put(double b)

Writes the double at this buffer's current position, and then increments the position.

Throws: BufferOverflowException If there no remaining doubles in this buffer. ReadOnlyBufferException If this buffer is read-only.

put

public abstract DoubleBuffer put(int index, double b)

Absolute put method.

Throws: IndexOutOfBoundsException If index is negative or not smaller than the buffer's limit. ReadOnlyBufferException If this buffer is read-only.

slice

public abstract DoubleBuffer slice()

Creates a new DoubleBuffer whose content is a shared subsequence of this buffer's content.

wrap

public static final DoubleBuffer wrap(double[] array, int offset, int length)

Wraps a double array into a DoubleBuffer object.

Throws: IndexOutOfBoundsException If the preconditions on the offset and length parameters do not hold

wrap

public static final DoubleBuffer wrap(double[] array)

Wraps a double array into a DoubleBuffer object.