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⏎ java/nio/DoubleBuffer.java
/*
* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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// -- This file was mechanically generated: Do not edit! -- //
package java.nio;
import jdk.internal.util.ArraysSupport;
/**
* A double buffer.
*
* <p> This class defines four categories of operations upon
* double buffers:
*
* <ul>
*
* <li><p> Absolute and relative {@link #get() <i>get</i>} and
* {@link #put(double) <i>put</i>} methods that read and write
* single doubles; </p></li>
*
* <li><p> Relative {@link #get(double[]) <i>bulk get</i>}
* methods that transfer contiguous sequences of doubles from this buffer
* into an array; and</p></li>
*
* <li><p> Relative {@link #put(double[]) <i>bulk put</i>}
* methods that transfer contiguous sequences of doubles from a
* double array or some other double
* buffer into this buffer; and </p></li>
*
*
* <li><p> A method for {@link #compact compacting}
* a double buffer. </p></li>
*
* </ul>
*
* <p> Double buffers can be created either by {@link #allocate
* <i>allocation</i>}, which allocates space for the buffer's
*
*
* content, by {@link #wrap(double[]) <i>wrapping</i>} an existing
* double array into a buffer, or by creating a
* <a href="ByteBuffer.html#views"><i>view</i></a> of an existing byte buffer.
*
*
*
*
* <p> Like a byte buffer, a double buffer is either <a
* href="ByteBuffer.html#direct"><i>direct</i> or <i>non-direct</i></a>. A
* double buffer created via the {@code wrap} methods of this class will
* be non-direct. A double buffer created as a view of a byte buffer will
* be direct if, and only if, the byte buffer itself is direct. Whether or not
* a double buffer is direct may be determined by invoking the {@link
* #isDirect isDirect} method. </p>
*
*
*
*
* <p> Methods in this class that do not otherwise have a value to return are
* specified to return the buffer upon which they are invoked. This allows
* method invocations to be chained.
*
*
*
* @author Mark Reinhold
* @author JSR-51 Expert Group
* @since 1.4
*/
public abstract class DoubleBuffer
extends Buffer
implements Comparable<DoubleBuffer>
{
// These fields are declared here rather than in Heap-X-Buffer in order to
// reduce the number of virtual method invocations needed to access these
// values, which is especially costly when coding small buffers.
//
final double[] hb; // Non-null only for heap buffers
final int offset;
boolean isReadOnly;
// Creates a new buffer with the given mark, position, limit, capacity,
// backing array, and array offset
//
DoubleBuffer(int mark, int pos, int lim, int cap, // package-private
double[] hb, int offset)
{
super(mark, pos, lim, cap);
this.hb = hb;
this.offset = offset;
}
// Creates a new buffer with the given mark, position, limit, and capacity
//
DoubleBuffer(int mark, int pos, int lim, int cap) { // package-private
this(mark, pos, lim, cap, null, 0);
}
@Override
Object base() {
return hb;
}
/**
* Allocates a new double buffer.
*
* <p> The new buffer's position will be zero, its limit will be its
* capacity, its mark will be undefined, each of its elements will be
* initialized to zero, and its byte order will be
* the {@link ByteOrder#nativeOrder native order} of the underlying
* hardware.
* It will have a {@link #array backing array}, and its
* {@link #arrayOffset array offset} will be zero.
*
* @param capacity
* The new buffer's capacity, in doubles
*
* @return The new double buffer
*
* @throws IllegalArgumentException
* If the {@code capacity} is a negative integer
*/
public static DoubleBuffer allocate(int capacity) {
if (capacity < 0)
throw createCapacityException(capacity);
return new HeapDoubleBuffer(capacity, capacity);
}
/**
* Wraps a double array into a buffer.
*
* <p> The new buffer will be backed by the given double array;
* that is, modifications to the buffer will cause the array to be modified
* and vice versa. The new buffer's capacity will be
* {@code array.length}, its position will be {@code offset}, its limit
* will be {@code offset + length}, its mark will be undefined, and its
* byte order will be
* the {@link ByteOrder#nativeOrder native order} of the underlying
* hardware.
* Its {@link #array backing array} will be the given array, and
* its {@link #arrayOffset array offset} will be zero. </p>
*
* @param array
* The array that will back the new buffer
*
* @param offset
* The offset of the subarray to be used; must be non-negative and
* no larger than {@code array.length}. The new buffer's position
* will be set to this value.
*
* @param length
* The length of the subarray to be used;
* must be non-negative and no larger than
* {@code array.length - offset}.
* The new buffer's limit will be set to {@code offset + length}.
*
* @return The new double buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code offset} and {@code length}
* parameters do not hold
*/
public static DoubleBuffer wrap(double[] array,
int offset, int length)
{
try {
return new HeapDoubleBuffer(array, offset, length);
} catch (IllegalArgumentException x) {
throw new IndexOutOfBoundsException();
}
}
/**
* Wraps a double array into a buffer.
*
* <p> The new buffer will be backed by the given double array;
* that is, modifications to the buffer will cause the array to be modified
* and vice versa. The new buffer's capacity and limit will be
* {@code array.length}, its position will be zero, its mark will be
* undefined, and its byte order will be
* the {@link ByteOrder#nativeOrder native order} of the underlying
* hardware.
* Its {@link #array backing array} will be the given array, and its
* {@link #arrayOffset array offset} will be zero. </p>
*
* @param array
* The array that will back this buffer
*
* @return The new double buffer
*/
public static DoubleBuffer wrap(double[] array) {
return wrap(array, 0, array.length);
}
/**
* Creates a new double buffer whose content is a shared subsequence of
* this buffer's content.
*
* <p> The content of the new buffer will start at this buffer's current
* position. Changes to this buffer's content will be visible in the new
* buffer, and vice versa; the two buffers' position, limit, and mark
* values will be independent.
*
* <p> The new buffer's position will be zero, its capacity and its limit
* will be the number of doubles remaining in this buffer, its mark will be
* undefined, and its byte order will be
* identical to that of this buffer.
* The new buffer will be direct if, and only if, this buffer is direct, and
* it will be read-only if, and only if, this buffer is read-only. </p>
*
* @return The new double buffer
*/
@Override
public abstract DoubleBuffer slice();
/**
* Creates a new double buffer that shares this buffer's content.
*
* <p> The content of the new buffer will be that of this buffer. Changes
* to this buffer's content will be visible in the new buffer, and vice
* versa; the two buffers' position, limit, and mark values will be
* independent.
*
* <p> The new buffer's capacity, limit, position,
* mark values, and byte order will be identical to those of this buffer.
* The new buffer will be direct if, and only if, this buffer is direct, and
* it will be read-only if, and only if, this buffer is read-only. </p>
*
* @return The new double buffer
*/
@Override
public abstract DoubleBuffer duplicate();
/**
* Creates a new, read-only double buffer that shares this buffer's
* content.
*
* <p> The content of the new buffer will be that of this buffer. Changes
* to this buffer's content will be visible in the new buffer; the new
* buffer itself, however, will be read-only and will not allow the shared
* content to be modified. The two buffers' position, limit, and mark
* values will be independent.
*
* <p> The new buffer's capacity, limit, position,
* mark values, and byte order will be identical to those of this buffer.
*
* <p> If this buffer is itself read-only then this method behaves in
* exactly the same way as the {@link #duplicate duplicate} method. </p>
*
* @return The new, read-only double buffer
*/
public abstract DoubleBuffer asReadOnlyBuffer();
// -- Singleton get/put methods --
/**
* Relative <i>get</i> method. Reads the double at this buffer's
* current position, and then increments the position.
*
* @return The double at the buffer's current position
*
* @throws BufferUnderflowException
* If the buffer's current position is not smaller than its limit
*/
public abstract double get();
/**
* Relative <i>put</i> method <i>(optional operation)</i>.
*
* <p> Writes the given double into this buffer at the current
* position, and then increments the position. </p>
*
* @param d
* The double to be written
*
* @return This buffer
*
* @throws BufferOverflowException
* If this buffer's current position is not smaller than its limit
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public abstract DoubleBuffer put(double d);
/**
* Absolute <i>get</i> method. Reads the double at the given
* index.
*
* @param index
* The index from which the double will be read
*
* @return The double at the given index
*
* @throws IndexOutOfBoundsException
* If {@code index} is negative
* or not smaller than the buffer's limit
*/
public abstract double get(int index);
/**
* Absolute <i>put</i> method <i>(optional operation)</i>.
*
* <p> Writes the given double into this buffer at the given
* index. </p>
*
* @param index
* The index at which the double will be written
*
* @param d
* The double value to be written
*
* @return This buffer
*
* @throws IndexOutOfBoundsException
* If {@code index} is negative
* or not smaller than the buffer's limit
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public abstract DoubleBuffer put(int index, double d);
// -- Bulk get operations --
/**
* Relative bulk <i>get</i> method.
*
* <p> This method transfers doubles from this buffer into the given
* destination array. If there are fewer doubles remaining in the
* buffer than are required to satisfy the request, that is, if
* {@code length} {@code >} {@code remaining()}, then no
* doubles are transferred and a {@link BufferUnderflowException} is
* thrown.
*
* <p> Otherwise, this method copies {@code length} doubles from this
* buffer into the given array, starting at the current position of this
* buffer and at the given offset in the array. The position of this
* buffer is then incremented by {@code length}.
*
* <p> In other words, an invocation of this method of the form
* <code>src.get(dst, off, len)</code> has exactly the same effect as
* the loop
*
* <pre>{@code
* for (int i = off; i < off + len; i++)
* dst[i] = src.get();
* }</pre>
*
* except that it first checks that there are sufficient doubles in
* this buffer and it is potentially much more efficient.
*
* @param dst
* The array into which doubles are to be written
*
* @param offset
* The offset within the array of the first double to be
* written; must be non-negative and no larger than
* {@code dst.length}
*
* @param length
* The maximum number of doubles to be written to the given
* array; must be non-negative and no larger than
* {@code dst.length - offset}
*
* @return This buffer
*
* @throws BufferUnderflowException
* If there are fewer than {@code length} doubles
* remaining in this buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code offset} and {@code length}
* parameters do not hold
*/
public DoubleBuffer get(double[] dst, int offset, int length) {
checkBounds(offset, length, dst.length);
if (length > remaining())
throw new BufferUnderflowException();
int end = offset + length;
for (int i = offset; i < end; i++)
dst[i] = get();
return this;
}
/**
* Relative bulk <i>get</i> method.
*
* <p> This method transfers doubles from this buffer into the given
* destination array. An invocation of this method of the form
* {@code src.get(a)} behaves in exactly the same way as the invocation
*
* <pre>
* src.get(a, 0, a.length) </pre>
*
* @param dst
* The destination array
*
* @return This buffer
*
* @throws BufferUnderflowException
* If there are fewer than {@code length} doubles
* remaining in this buffer
*/
public DoubleBuffer get(double[] dst) {
return get(dst, 0, dst.length);
}
// -- Bulk put operations --
/**
* Relative bulk <i>put</i> method <i>(optional operation)</i>.
*
* <p> This method transfers the doubles remaining in the given source
* buffer into this buffer. If there are more doubles remaining in the
* source buffer than in this buffer, that is, if
* {@code src.remaining()} {@code >} {@code remaining()},
* then no doubles are transferred and a {@link
* BufferOverflowException} is thrown.
*
* <p> Otherwise, this method copies
* <i>n</i> = {@code src.remaining()} doubles from the given
* buffer into this buffer, starting at each buffer's current position.
* The positions of both buffers are then incremented by <i>n</i>.
*
* <p> In other words, an invocation of this method of the form
* {@code dst.put(src)} has exactly the same effect as the loop
*
* <pre>
* while (src.hasRemaining())
* dst.put(src.get()); </pre>
*
* except that it first checks that there is sufficient space in this
* buffer and it is potentially much more efficient.
*
* @param src
* The source buffer from which doubles are to be read;
* must not be this buffer
*
* @return This buffer
*
* @throws BufferOverflowException
* If there is insufficient space in this buffer
* for the remaining doubles in the source buffer
*
* @throws IllegalArgumentException
* If the source buffer is this buffer
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public DoubleBuffer put(DoubleBuffer src) {
if (src == this)
throw createSameBufferException();
if (isReadOnly())
throw new ReadOnlyBufferException();
int n = src.remaining();
if (n > remaining())
throw new BufferOverflowException();
for (int i = 0; i < n; i++)
put(src.get());
return this;
}
/**
* Relative bulk <i>put</i> method <i>(optional operation)</i>.
*
* <p> This method transfers doubles into this buffer from the given
* source array. If there are more doubles to be copied from the array
* than remain in this buffer, that is, if
* {@code length} {@code >} {@code remaining()}, then no
* doubles are transferred and a {@link BufferOverflowException} is
* thrown.
*
* <p> Otherwise, this method copies {@code length} doubles from the
* given array into this buffer, starting at the given offset in the array
* and at the current position of this buffer. The position of this buffer
* is then incremented by {@code length}.
*
* <p> In other words, an invocation of this method of the form
* <code>dst.put(src, off, len)</code> has exactly the same effect as
* the loop
*
* <pre>{@code
* for (int i = off; i < off + len; i++)
* dst.put(a[i]);
* }</pre>
*
* except that it first checks that there is sufficient space in this
* buffer and it is potentially much more efficient.
*
* @param src
* The array from which doubles are to be read
*
* @param offset
* The offset within the array of the first double to be read;
* must be non-negative and no larger than {@code array.length}
*
* @param length
* The number of doubles to be read from the given array;
* must be non-negative and no larger than
* {@code array.length - offset}
*
* @return This buffer
*
* @throws BufferOverflowException
* If there is insufficient space in this buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code offset} and {@code length}
* parameters do not hold
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public DoubleBuffer put(double[] src, int offset, int length) {
checkBounds(offset, length, src.length);
if (length > remaining())
throw new BufferOverflowException();
int end = offset + length;
for (int i = offset; i < end; i++)
this.put(src[i]);
return this;
}
/**
* Relative bulk <i>put</i> method <i>(optional operation)</i>.
*
* <p> This method transfers the entire content of the given source
* double array into this buffer. An invocation of this method of the
* form {@code dst.put(a)} behaves in exactly the same way as the
* invocation
*
* <pre>
* dst.put(a, 0, a.length) </pre>
*
* @param src
* The source array
*
* @return This buffer
*
* @throws BufferOverflowException
* If there is insufficient space in this buffer
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public final DoubleBuffer put(double[] src) {
return put(src, 0, src.length);
}
// -- Other stuff --
/**
* Tells whether or not this buffer is backed by an accessible double
* array.
*
* <p> If this method returns {@code true} then the {@link #array() array}
* and {@link #arrayOffset() arrayOffset} methods may safely be invoked.
* </p>
*
* @return {@code true} if, and only if, this buffer
* is backed by an array and is not read-only
*/
public final boolean hasArray() {
return (hb != null) && !isReadOnly;
}
/**
* Returns the double array that backs this
* buffer <i>(optional operation)</i>.
*
* <p> Modifications to this buffer's content will cause the returned
* array's content to be modified, and vice versa.
*
* <p> Invoke the {@link #hasArray hasArray} method before invoking this
* method in order to ensure that this buffer has an accessible backing
* array. </p>
*
* @return The array that backs this buffer
*
* @throws ReadOnlyBufferException
* If this buffer is backed by an array but is read-only
*
* @throws UnsupportedOperationException
* If this buffer is not backed by an accessible array
*/
public final double[] array() {
if (hb == null)
throw new UnsupportedOperationException();
if (isReadOnly)
throw new ReadOnlyBufferException();
return hb;
}
/**
* Returns the offset within this buffer's backing array of the first
* element of the buffer <i>(optional operation)</i>.
*
* <p> If this buffer is backed by an array then buffer position <i>p</i>
* corresponds to array index <i>p</i> + {@code arrayOffset()}.
*
* <p> Invoke the {@link #hasArray hasArray} method before invoking this
* method in order to ensure that this buffer has an accessible backing
* array. </p>
*
* @return The offset within this buffer's array
* of the first element of the buffer
*
* @throws ReadOnlyBufferException
* If this buffer is backed by an array but is read-only
*
* @throws UnsupportedOperationException
* If this buffer is not backed by an accessible array
*/
public final int arrayOffset() {
if (hb == null)
throw new UnsupportedOperationException();
if (isReadOnly)
throw new ReadOnlyBufferException();
return offset;
}
// -- Covariant return type overrides
/**
* {@inheritDoc}
*/
@Override
public
final
DoubleBuffer position(int newPosition) {
super.position(newPosition);
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
DoubleBuffer limit(int newLimit) {
super.limit(newLimit);
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
DoubleBuffer mark() {
super.mark();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
DoubleBuffer reset() {
super.reset();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
DoubleBuffer clear() {
super.clear();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
DoubleBuffer flip() {
super.flip();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
DoubleBuffer rewind() {
super.rewind();
return this;
}
/**
* Compacts this buffer <i>(optional operation)</i>.
*
* <p> The doubles between the buffer's current position and its limit,
* if any, are copied to the beginning of the buffer. That is, the
* double at index <i>p</i> = {@code position()} is copied
* to index zero, the double at index <i>p</i> + 1 is copied
* to index one, and so forth until the double at index
* {@code limit()} - 1 is copied to index
* <i>n</i> = {@code limit()} - {@code 1} - <i>p</i>.
* The buffer's position is then set to <i>n+1</i> and its limit is set to
* its capacity. The mark, if defined, is discarded.
*
* <p> The buffer's position is set to the number of doubles copied,
* rather than to zero, so that an invocation of this method can be
* followed immediately by an invocation of another relative <i>put</i>
* method. </p>
*
*
* @return This buffer
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public abstract DoubleBuffer compact();
/**
* Tells whether or not this double buffer is direct.
*
* @return {@code true} if, and only if, this buffer is direct
*/
public abstract boolean isDirect();
/**
* Returns a string summarizing the state of this buffer.
*
* @return A summary string
*/
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append(getClass().getName());
sb.append("[pos=");
sb.append(position());
sb.append(" lim=");
sb.append(limit());
sb.append(" cap=");
sb.append(capacity());
sb.append("]");
return sb.toString();
}
/**
* Returns the current hash code of this buffer.
*
* <p> The hash code of a double buffer depends only upon its remaining
* elements; that is, upon the elements from {@code position()} up to, and
* including, the element at {@code limit()} - {@code 1}.
*
* <p> Because buffer hash codes are content-dependent, it is inadvisable
* to use buffers as keys in hash maps or similar data structures unless it
* is known that their contents will not change. </p>
*
* @return The current hash code of this buffer
*/
public int hashCode() {
int h = 1;
int p = position();
for (int i = limit() - 1; i >= p; i--)
h = 31 * h + (int)get(i);
return h;
}
/**
* Tells whether or not this buffer is equal to another object.
*
* <p> Two double buffers are equal if, and only if,
*
* <ol>
*
* <li><p> They have the same element type, </p></li>
*
* <li><p> They have the same number of remaining elements, and
* </p></li>
*
* <li><p> The two sequences of remaining elements, considered
* independently of their starting positions, are pointwise equal.
* This method considers two double elements {@code a} and {@code b}
* to be equal if
* {@code (a == b) || (Double.isNaN(a) && Double.isNaN(b))}.
* The values {@code -0.0} and {@code +0.0} are considered to be
* equal, unlike {@link Double#equals(Object)}.
* </p></li>
*
* </ol>
*
* <p> A double buffer is not equal to any other type of object. </p>
*
* @param ob The object to which this buffer is to be compared
*
* @return {@code true} if, and only if, this buffer is equal to the
* given object
*/
public boolean equals(Object ob) {
if (this == ob)
return true;
if (!(ob instanceof DoubleBuffer))
return false;
DoubleBuffer that = (DoubleBuffer)ob;
if (this.remaining() != that.remaining())
return false;
return BufferMismatch.mismatch(this, this.position(),
that, that.position(),
this.remaining()) < 0;
}
/**
* Compares this buffer to another.
*
* <p> Two double buffers are compared by comparing their sequences of
* remaining elements lexicographically, without regard to the starting
* position of each sequence within its corresponding buffer.
* Pairs of {@code double} elements are compared as if by invoking
* {@link Double#compare(double,double)}, except that
* {@code -0.0} and {@code 0.0} are considered to be equal.
* {@code Double.NaN} is considered by this method to be equal
* to itself and greater than all other {@code double} values
* (including {@code Double.POSITIVE_INFINITY}).
*
* <p> A double buffer is not comparable to any other type of object.
*
* @return A negative integer, zero, or a positive integer as this buffer
* is less than, equal to, or greater than the given buffer
*/
public int compareTo(DoubleBuffer that) {
int i = BufferMismatch.mismatch(this, this.position(),
that, that.position(),
Math.min(this.remaining(), that.remaining()));
if (i >= 0) {
return compare(this.get(this.position() + i), that.get(that.position() + i));
}
return this.remaining() - that.remaining();
}
private static int compare(double x, double y) {
return ((x < y) ? -1 :
(x > y) ? +1 :
(x == y) ? 0 :
Double.isNaN(x) ? (Double.isNaN(y) ? 0 : +1) : -1);
}
/**
* Finds and returns the relative index of the first mismatch between this
* buffer and a given buffer. The index is relative to the
* {@link #position() position} of each buffer and will be in the range of
* 0 (inclusive) up to the smaller of the {@link #remaining() remaining}
* elements in each buffer (exclusive).
*
* <p> If the two buffers share a common prefix then the returned index is
* the length of the common prefix and it follows that there is a mismatch
* between the two buffers at that index within the respective buffers.
* If one buffer is a proper prefix of the other then the returned index is
* the smaller of the remaining elements in each buffer, and it follows that
* the index is only valid for the buffer with the larger number of
* remaining elements.
* Otherwise, there is no mismatch.
*
* @param that
* The byte buffer to be tested for a mismatch with this buffer
*
* @return The relative index of the first mismatch between this and the
* given buffer, otherwise -1 if no mismatch.
*
* @since 11
*/
public int mismatch(DoubleBuffer that) {
int length = Math.min(this.remaining(), that.remaining());
int r = BufferMismatch.mismatch(this, this.position(),
that, that.position(),
length);
return (r == -1 && this.remaining() != that.remaining()) ? length : r;
}
// -- Other char stuff --
// -- Other byte stuff: Access to binary data --
/**
* Retrieves this buffer's byte order.
*
* <p> The byte order of a double buffer created by allocation or by
* wrapping an existing {@code double} array is the {@link
* ByteOrder#nativeOrder native order} of the underlying
* hardware. The byte order of a double buffer created as a <a
* href="ByteBuffer.html#views">view</a> of a byte buffer is that of the
* byte buffer at the moment that the view is created. </p>
*
* @return This buffer's byte order
*/
public abstract ByteOrder order();
}
⏎ java/nio/DoubleBuffer.java
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