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⏎ java/nio/ShortBuffer.java
/*
* Copyright (c) 2000, 2021, 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 java.lang.ref.Reference;
import java.util.Objects;
import jdk.internal.access.foreign.MemorySegmentProxy;
import jdk.internal.util.ArraysSupport;
/**
* A short buffer.
*
* <p> This class defines four categories of operations upon
* short buffers:
*
* <ul>
*
* <li><p> Absolute and relative {@link #get() <i>get</i>} and
* {@link #put(short) <i>put</i>} methods that read and write
* single shorts; </p></li>
*
* <li><p> Absolute and relative {@link #get(short[]) <i>bulk get</i>}
* methods that transfer contiguous sequences of shorts from this buffer
* into an array; and</p></li>
*
* <li><p> Absolute and relative {@link #put(short[]) <i>bulk put</i>}
* methods that transfer contiguous sequences of shorts from a
* short array{#if[char]?, a string,} or some other short
* buffer into this buffer;{#if[!byte]? and} </p></li>
*
*
* <li><p> A method for {@link #compact compacting}
* a short buffer. </p></li>
*
* </ul>
*
* <p> Short buffers can be created either by {@link #allocate
* <i>allocation</i>}, which allocates space for the buffer's
*
*
* content, by {@link #wrap(short[]) <i>wrapping</i>} an existing
* short array {#if[char]?or string} 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 short buffer is either <a
* href="ByteBuffer.html#direct"><i>direct</i> or <i>non-direct</i></a>. A
* short buffer created via the {@code wrap} methods of this class will
* be non-direct. A short 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 short 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 ShortBuffer
extends Buffer
implements Comparable<ShortBuffer>
{
// Cached array base offset
private static final long ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset(short[].class);
// 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 short[] 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
//
ShortBuffer(int mark, int pos, int lim, int cap, // package-private
short[] hb, int offset, MemorySegmentProxy segment)
{
super(mark, pos, lim, cap, segment);
this.hb = hb;
this.offset = offset;
}
// Creates a new buffer with the given mark, position, limit, and capacity
//
ShortBuffer(int mark, int pos, int lim, int cap, MemorySegmentProxy segment) { // package-private
this(mark, pos, lim, cap, null, 0, segment);
}
// Creates a new buffer with given base, address and capacity
//
ShortBuffer(short[] hb, long addr, int cap, MemorySegmentProxy segment) { // package-private
super(addr, cap, segment);
this.hb = hb;
this.offset = 0;
}
@Override
Object base() {
return hb;
}
/**
* Allocates a new short 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 shorts
*
* @return The new short buffer
*
* @throws IllegalArgumentException
* If the {@code capacity} is a negative integer
*/
public static ShortBuffer allocate(int capacity) {
if (capacity < 0)
throw createCapacityException(capacity);
return new HeapShortBuffer(capacity, capacity, null);
}
/**
* Wraps a short array into a buffer.
*
* <p> The new buffer will be backed by the given short 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 short buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code offset} and {@code length}
* parameters do not hold
*/
public static ShortBuffer wrap(short[] array,
int offset, int length)
{
try {
return new HeapShortBuffer(array, offset, length, null);
} catch (IllegalArgumentException x) {
throw new IndexOutOfBoundsException();
}
}
/**
* Wraps a short array into a buffer.
*
* <p> The new buffer will be backed by the given short 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 short buffer
*/
public static ShortBuffer wrap(short[] array) {
return wrap(array, 0, array.length);
}
/**
* Creates a new short 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 shorts 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 short buffer
*/
@Override
public abstract ShortBuffer slice();
/**
* Creates a new short buffer whose content is a shared subsequence of
* this buffer's content.
*
* <p> The content of the new buffer will start at position {@code index}
* in this buffer, and will contain {@code length} elements. 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 {@code length}, 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>
*
* @param index
* The position in this buffer at which the content of the new
* buffer will start; must be non-negative and no larger than
* {@link #limit() limit()}
*
* @param length
* The number of elements the new buffer will contain; must be
* non-negative and no larger than {@code limit() - index}
*
* @return The new buffer
*
* @throws IndexOutOfBoundsException
* If {@code index} is negative or greater than {@code limit()},
* {@code length} is negative, or {@code length > limit() - index}
*
* @since 13
*/
@Override
public abstract ShortBuffer slice(int index, int length);
/**
* Creates a new short 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 short buffer
*/
@Override
public abstract ShortBuffer duplicate();
/**
* Creates a new, read-only short 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 short buffer
*/
public abstract ShortBuffer asReadOnlyBuffer();
// -- Singleton get/put methods --
/**
* Relative <i>get</i> method. Reads the short at this buffer's
* current position, and then increments the position.
*
* @return The short at the buffer's current position
*
* @throws BufferUnderflowException
* If the buffer's current position is not smaller than its limit
*/
public abstract short get();
/**
* Relative <i>put</i> method <i>(optional operation)</i>.
*
* <p> Writes the given short into this buffer at the current
* position, and then increments the position. </p>
*
* @param s
* The short 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 ShortBuffer put(short s);
/**
* Absolute <i>get</i> method. Reads the short at the given
* index.
*
* @param index
* The index from which the short will be read
*
* @return The short at the given index
*
* @throws IndexOutOfBoundsException
* If {@code index} is negative
* or not smaller than the buffer's limit
*/
public abstract short get(int index);
/**
* Absolute <i>put</i> method <i>(optional operation)</i>.
*
* <p> Writes the given short into this buffer at the given
* index. </p>
*
* @param index
* The index at which the short will be written
*
* @param s
* The short 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 ShortBuffer put(int index, short s);
// -- Bulk get operations --
/**
* Relative bulk <i>get</i> method.
*
* <p> This method transfers shorts from this buffer into the given
* destination array. If there are fewer shorts remaining in the
* buffer than are required to satisfy the request, that is, if
* {@code length} {@code >} {@code remaining()}, then no
* shorts are transferred and a {@link BufferUnderflowException} is
* thrown.
*
* <p> Otherwise, this method copies {@code length} shorts 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 shorts in
* this buffer and it is potentially much more efficient.
*
* @param dst
* The array into which shorts are to be written
*
* @param offset
* The offset within the array of the first short to be
* written; must be non-negative and no larger than
* {@code dst.length}
*
* @param length
* The maximum number of shorts 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} shorts
* remaining in this buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code offset} and {@code length}
* parameters do not hold
*/
public ShortBuffer get(short[] dst, int offset, int length) {
Objects.checkFromIndexSize(offset, length, dst.length);
int pos = position();
if (length > limit() - pos)
throw new BufferUnderflowException();
getArray(pos, dst, offset, length);
position(pos + length);
return this;
}
/**
* Relative bulk <i>get</i> method.
*
* <p> This method transfers shorts 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} shorts
* remaining in this buffer
*/
public ShortBuffer get(short[] dst) {
return get(dst, 0, dst.length);
}
/**
* Absolute bulk <i>get</i> method.
*
* <p> This method transfers {@code length} shorts from this
* buffer into the given array, starting at the given index in this
* buffer and at the given offset in the array. The position of this
* buffer is unchanged.
*
* <p> An invocation of this method of the form
* <code>src.get(index, dst, offset, length)</code>
* has exactly the same effect as the following loop except that it first
* checks the consistency of the supplied parameters and it is potentially
* much more efficient:
*
* <pre>{@code
* for (int i = offset, j = index; i < offset + length; i++, j++)
* dst[i] = src.get(j);
* }</pre>
*
* @param index
* The index in this buffer from which the first short will be
* read; must be non-negative and less than {@code limit()}
*
* @param dst
* The destination array
*
* @param offset
* The offset within the array of the first short to be
* written; must be non-negative and less than
* {@code dst.length}
*
* @param length
* The number of shorts to be written to the given array;
* must be non-negative and no larger than the smaller of
* {@code limit() - index} and {@code dst.length - offset}
*
* @return This buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code index}, {@code offset}, and
* {@code length} parameters do not hold
*
* @since 13
*/
public ShortBuffer get(int index, short[] dst, int offset, int length) {
Objects.checkFromIndexSize(index, length, limit());
Objects.checkFromIndexSize(offset, length, dst.length);
getArray(index, dst, offset, length);
return this;
}
/**
* Absolute bulk <i>get</i> method.
*
* <p> This method transfers shorts from this buffer into the given
* destination array. The position of this buffer is unchanged. An
* invocation of this method of the form
* <code>src.get(index, dst)</code> behaves in exactly the same
* way as the invocation:
*
* <pre>
* src.get(index, dst, 0, dst.length) </pre>
*
* @param index
* The index in this buffer from which the first short will be
* read; must be non-negative and less than {@code limit()}
*
* @param dst
* The destination array
*
* @return This buffer
*
* @throws IndexOutOfBoundsException
* If {@code index} is negative, not smaller than {@code limit()},
* or {@code limit() - index < dst.length}
*
* @since 13
*/
public ShortBuffer get(int index, short[] dst) {
return get(index, dst, 0, dst.length);
}
private ShortBuffer getArray(int index, short[] dst, int offset, int length) {
if (
((long)length << 1) > Bits.JNI_COPY_TO_ARRAY_THRESHOLD) {
long bufAddr = address + ((long)index << 1);
long dstOffset =
ARRAY_BASE_OFFSET + ((long)offset << 1);
long len = (long)length << 1;
try {
if (order() != ByteOrder.nativeOrder())
SCOPED_MEMORY_ACCESS.copySwapMemory(
scope(), null, base(), bufAddr,
dst, dstOffset, len, Short.BYTES);
else
SCOPED_MEMORY_ACCESS.copyMemory(
scope(), null, base(), bufAddr,
dst, dstOffset, len);
} finally {
Reference.reachabilityFence(this);
}
} else {
int end = offset + length;
for (int i = offset, j = index; i < end; i++, j++) {
dst[i] = get(j);
}
}
return this;
}
// -- Bulk put operations --
/**
* Relative bulk <i>put</i> method <i>(optional operation)</i>.
*
* <p> This method transfers the shorts remaining in the given source
* buffer into this buffer. If there are more shorts remaining in the
* source buffer than in this buffer, that is, if
* {@code src.remaining()} {@code >} {@code remaining()},
* then no shorts are transferred and a {@link
* BufferOverflowException} is thrown.
*
* <p> Otherwise, this method copies
* <i>n</i> = {@code src.remaining()} shorts 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. If this buffer and
* the source buffer share the same backing array or memory, then the
* result will be as if the source elements were first copied to an
* intermediate location before being written into this buffer.
*
* @param src
* The source buffer from which shorts 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 shorts in the source buffer
*
* @throws IllegalArgumentException
* If the source buffer is this buffer
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public ShortBuffer put(ShortBuffer src) {
if (src == this)
throw createSameBufferException();
if (isReadOnly())
throw new ReadOnlyBufferException();
int srcPos = src.position();
int srcLim = src.limit();
int srcRem = (srcPos <= srcLim ? srcLim - srcPos : 0);
int pos = position();
int lim = limit();
int rem = (pos <= lim ? lim - pos : 0);
if (srcRem > rem)
throw new BufferOverflowException();
putBuffer(pos, src, srcPos, srcRem);
position(pos + srcRem);
src.position(srcPos + srcRem);
return this;
}
/**
* Absolute bulk <i>put</i> method <i>(optional operation)</i>.
*
* <p> This method transfers {@code length} shorts into this buffer from
* the given source buffer, starting at the given {@code offset} in the
* source buffer and the given {@code index} in this buffer. The positions
* of both buffers are unchanged.
*
* <p> In other words, an invocation of this method of the form
* <code>dst.put(index, src, offset, length)</code>
* has exactly the same effect as the loop
*
* <pre>{@code
* for (int i = offset, j = index; i < offset + length; i++, j++)
* dst.put(j, src.get(i));
* }</pre>
*
* except that it first checks the consistency of the supplied parameters
* and it is potentially much more efficient. If this buffer and
* the source buffer share the same backing array or memory, then the
* result will be as if the source elements were first copied to an
* intermediate location before being written into this buffer.
*
* @param index
* The index in this buffer at which the first short will be
* written; must be non-negative and less than {@code limit()}
*
* @param src
* The buffer from which shorts are to be read
*
* @param offset
* The index within the source buffer of the first short to be
* read; must be non-negative and less than {@code src.limit()}
*
* @param length
* The number of shorts to be read from the given buffer;
* must be non-negative and no larger than the smaller of
* {@code limit() - index} and {@code src.limit() - offset}
*
* @return This buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code index}, {@code offset}, and
* {@code length} parameters do not hold
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*
* @since 16
*/
public ShortBuffer put(int index, ShortBuffer src, int offset, int length) {
Objects.checkFromIndexSize(index, length, limit());
Objects.checkFromIndexSize(offset, length, src.limit());
if (isReadOnly())
throw new ReadOnlyBufferException();
putBuffer(index, src, offset, length);
return this;
}
void putBuffer(int pos, ShortBuffer src, int srcPos, int n) {
Object srcBase = src.base();
assert srcBase != null || src.isDirect();
Object base = base();
assert base != null || isDirect();
long srcAddr = src.address + ((long)srcPos << 1);
long addr = address + ((long)pos << 1);
long len = (long)n << 1;
try {
if (this.order() != src.order())
SCOPED_MEMORY_ACCESS.copySwapMemory(
src.scope(), scope(), srcBase, srcAddr,
base, addr, len, Short.BYTES);
else
SCOPED_MEMORY_ACCESS.copyMemory(
src.scope(), scope(), srcBase, srcAddr,
base, addr, len);
} finally {
Reference.reachabilityFence(src);
Reference.reachabilityFence(this);
}
}
/**
* Relative bulk <i>put</i> method <i>(optional operation)</i>.
*
* <p> This method transfers shorts into this buffer from the given
* source array. If there are more shorts to be copied from the array
* than remain in this buffer, that is, if
* {@code length} {@code >} {@code remaining()}, then no
* shorts are transferred and a {@link BufferOverflowException} is
* thrown.
*
* <p> Otherwise, this method copies {@code length} shorts 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(src[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 shorts are to be read
*
* @param offset
* The offset within the array of the first short to be read;
* must be non-negative and no larger than {@code src.length}
*
* @param length
* The number of shorts to be read from the given array;
* must be non-negative and no larger than
* {@code src.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 ShortBuffer put(short[] src, int offset, int length) {
if (isReadOnly())
throw new ReadOnlyBufferException();
Objects.checkFromIndexSize(offset, length, src.length);
int pos = position();
if (length > limit() - pos)
throw new BufferOverflowException();
putArray(pos, src, offset, length);
position(pos + length);
return this;
}
/**
* Relative bulk <i>put</i> method <i>(optional operation)</i>.
*
* <p> This method transfers the entire content of the given source
* short 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 ShortBuffer put(short[] src) {
return put(src, 0, src.length);
}
/**
* Absolute bulk <i>put</i> method <i>(optional operation)</i>.
*
* <p> This method transfers {@code length} shorts from the given
* array, starting at the given offset in the array and at the given index
* in this buffer. The position of this buffer is unchanged.
*
* <p> An invocation of this method of the form
* <code>dst.put(index, src, offset, length)</code>
* has exactly the same effect as the following loop except that it first
* checks the consistency of the supplied parameters and it is potentially
* much more efficient:
*
* <pre>{@code
* for (int i = offset, j = index; i < offset + length; i++, j++)
* dst.put(j, src[i]);
* }</pre>
*
* @param index
* The index in this buffer at which the first short will be
* written; must be non-negative and less than {@code limit()}
*
* @param src
* The array from which shorts are to be read
*
* @param offset
* The offset within the array of the first short to be read;
* must be non-negative and less than {@code src.length}
*
* @param length
* The number of shorts to be read from the given array;
* must be non-negative and no larger than the smaller of
* {@code limit() - index} and {@code src.length - offset}
*
* @return This buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code index}, {@code offset}, and
* {@code length} parameters do not hold
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*
* @since 13
*/
public ShortBuffer put(int index, short[] src, int offset, int length) {
if (isReadOnly())
throw new ReadOnlyBufferException();
Objects.checkFromIndexSize(index, length, limit());
Objects.checkFromIndexSize(offset, length, src.length);
putArray(index, src, offset, length);
return this;
}
/**
* Absolute bulk <i>put</i> method <i>(optional operation)</i>.
*
* <p> This method copies shorts into this buffer from the given source
* array. The position of this buffer is unchanged. An invocation of this
* method of the form <code>dst.put(index, src)</code>
* behaves in exactly the same way as the invocation:
*
* <pre>
* dst.put(index, src, 0, src.length); </pre>
*
* @param index
* The index in this buffer at which the first short will be
* written; must be non-negative and less than {@code limit()}
*
* @param src
* The array from which shorts are to be read
*
* @return This buffer
*
* @throws IndexOutOfBoundsException
* If {@code index} is negative, not smaller than {@code limit()},
* or {@code limit() - index < src.length}
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*
* @since 13
*/
public ShortBuffer put(int index, short[] src) {
return put(index, src, 0, src.length);
}
private ShortBuffer putArray(int index, short[] src, int offset, int length) {
if (
((long)length << 1) > Bits.JNI_COPY_FROM_ARRAY_THRESHOLD) {
long bufAddr = address + ((long)index << 1);
long srcOffset =
ARRAY_BASE_OFFSET + ((long)offset << 1);
long len = (long)length << 1;
try {
if (order() != ByteOrder.nativeOrder())
SCOPED_MEMORY_ACCESS.copySwapMemory(
null, scope(), src, srcOffset,
base(), bufAddr, len, Short.BYTES);
else
SCOPED_MEMORY_ACCESS.copyMemory(
null, scope(), src, srcOffset,
base(), bufAddr, len);
} finally {
Reference.reachabilityFence(this);
}
} else {
int end = offset + length;
for (int i = offset, j = index; i < end; i++, j++)
this.put(j, src[i]);
}
return this;
}
// -- Other stuff --
/**
* Tells whether or not this buffer is backed by an accessible short
* 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 short 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 short[] 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
ShortBuffer position(int newPosition) {
super.position(newPosition);
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
ShortBuffer limit(int newLimit) {
super.limit(newLimit);
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
ShortBuffer mark() {
super.mark();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
ShortBuffer reset() {
super.reset();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
ShortBuffer clear() {
super.clear();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
ShortBuffer flip() {
super.flip();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
final
ShortBuffer rewind() {
super.rewind();
return this;
}
/**
* Compacts this buffer <i>(optional operation)</i>.
*
* <p> The shorts between the buffer's current position and its limit,
* if any, are copied to the beginning of the buffer. That is, the
* short at index <i>p</i> = {@code position()} is copied
* to index zero, the short at index <i>p</i> + 1 is copied
* to index one, and so forth until the short 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 shorts 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 ShortBuffer compact();
/**
* Tells whether or not this short 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() {
return getClass().getName()
+ "[pos=" + position()
+ " lim=" + limit()
+ " cap=" + capacity()
+ "]";
}
/**
* Returns the current hash code of this buffer.
*
* <p> The hash code of a short 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 short 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.
* </p></li>
*
* </ol>
*
* <p> A short 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 ShortBuffer))
return false;
ShortBuffer that = (ShortBuffer)ob;
int thisPos = this.position();
int thisRem = this.limit() - thisPos;
int thatPos = that.position();
int thatRem = that.limit() - thatPos;
if (thisRem < 0 || thisRem != thatRem)
return false;
return BufferMismatch.mismatch(this, thisPos,
that, thatPos,
thisRem) < 0;
}
/**
* Compares this buffer to another.
*
* <p> Two short 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 short} elements are compared as if by invoking
* {@link Short#compare(short,short)}.
*
* <p> A short 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(ShortBuffer that) {
int thisPos = this.position();
int thisRem = this.limit() - thisPos;
int thatPos = that.position();
int thatRem = that.limit() - thatPos;
int length = Math.min(thisRem, thatRem);
if (length < 0)
return -1;
int i = BufferMismatch.mismatch(this, thisPos,
that, thatPos,
length);
if (i >= 0) {
return compare(this.get(thisPos + i), that.get(thatPos + i));
}
return thisRem - thatRem;
}
private static int compare(short x, short y) {
return Short.compare(x, y);
}
/**
* 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(ShortBuffer that) {
int thisPos = this.position();
int thisRem = this.limit() - thisPos;
int thatPos = that.position();
int thatRem = that.limit() - thatPos;
int length = Math.min(thisRem, thatRem);
if (length < 0)
return -1;
int r = BufferMismatch.mismatch(this, thisPos,
that, thatPos,
length);
return (r == -1 && thisRem != thatRem) ? length : r;
}
// -- Other char stuff --
// -- Other byte stuff: Access to binary data --
/**
* Retrieves this buffer's byte order.
*
* <p> The byte order of a short buffer created by allocation or by
* wrapping an existing {@code short} array is the {@link
* ByteOrder#nativeOrder native order} of the underlying
* hardware. The byte order of a short 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/ShortBuffer.java
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