java.nio

Class DoubleBuffer

Implemented Interfaces:
Comparable<T>

public abstract class DoubleBuffer
extends Buffer
implements Comparable<T>

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.
abstract double
get()
Reads the double at this buffer's current position, and then increments the position.
DoubleBuffer
get(double[] dst)
This method transfers doubles from this buffer into the given destination array.
DoubleBuffer
get(double[] dst, int offset, int length)
This method transfers doubles from this buffer into the given destination array.
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.
abstract DoubleBuffer
put(double b)
Writes the double at this buffer's current position, and then increments the position.
DoubleBuffer
put(double[] src)
Writes the content of the the double array src into the buffer.
DoubleBuffer
put(double[] src, int offset, int length)
Writes the content of the the double array src into the buffer.
abstract DoubleBuffer
put(int index, double b)
Absolute put method.
DoubleBuffer
put(DoubleBuffer src)
Writes the content of the the DoubleBUFFER src into the buffer.
abstract DoubleBuffer
slice()
Creates a new DoubleBuffer whose content is a shared subsequence of this buffer's content.
static DoubleBuffer
wrap(double[] array)
Wraps a double array into a DoubleBuffer object.
static DoubleBuffer
wrap(double[] array, int offset, int length)
Wraps a double array into a DoubleBuffer object.

Methods inherited from class java.nio.Buffer

array, arrayOffset, capacity, clear, flip, hasArray, hasRemaining, isDirect, isReadOnly, limit, limit, mark, position, position, remaining, reset, rewind

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

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.
Overrides:
array in interface 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.
Overrides:
arrayOffset in interface Buffer
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.
Overrides:
equals in interface Object

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 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 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 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.
Overrides:
hasArray in interface Buffer

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.
Overrides:
hashCode in interface Object
Returns:
the hash code (casted to int)

isDirect

public abstract boolean isDirect()
Tells wether or not this buffer is direct.
Overrides:
isDirect in interface Buffer

order

public abstract ByteOrder order()
Returns the byte order of this buffer.

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 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 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 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.

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.

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)
Wraps a double array into a DoubleBuffer object.

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

DoubleBuffer.java -- Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.