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/*
* Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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#warn This file is preprocessed before being compiled
package java.nio;
#if[char]
import java.io.IOException;
#end[char]
import java.lang.ref.Reference;
#if[streamableType]
import java.util.Spliterator;
import java.util.stream.StreamSupport;
import java.util.stream.$Streamtype$Stream;
#end[streamableType]
import java.util.Objects;
import jdk.internal.access.foreign.MemorySegmentProxy;
import jdk.internal.util.ArraysSupport;
/**
* $A$ $type$ buffer.
*
* This class defines {#if[byte]?six:four} categories of operations upon
* $type$ buffers:
*
*
*
* Absolute and relative {@link #get() get} and
* {@link #put($type$) put} methods that read and write
* single $type$s;
Absolute and relative {@link #get($type$[]) bulk get}
* methods that transfer contiguous sequences of $type$s from this buffer
* into an array; {#if[!byte]?and}
Absolute and relative {@link #put($type$[]) bulk put}
* methods that transfer contiguous sequences of $type$s from $a$
* $type$ array{#if[char]?, a string,} or some other $type$
* buffer into this buffer;{#if[!byte]? and}
Absolute and relative {@link #getChar() get}
* and {@link #putChar(char) put} methods that read and
* write values of other primitive types, translating them to and from
* sequences of bytes in a particular byte order;
Methods for creating view buffers,
* which allow a byte buffer to be viewed as a buffer containing values of
* some other primitive type; and
A method for {@link #compact compacting}
* $a$ $type$ buffer.
*
* $Type$ buffers can be created either by {@link #allocate
* allocation}, which allocates space for the buffer's
*
#if[byte]
*
* content, or by {@link #wrap($type$[]) wrapping} an
* existing $type$ array {#if[char]?or string} into a buffer.
*
#else[byte]
*
* content, by {@link #wrap($type$[]) wrapping} an existing
* $type$ array {#if[char]?or string} into a buffer, or by creating a
* view of an existing byte buffer.
*
#end[byte]
*
#if[byte]
*
*
*
Direct vs. non-direct buffers
*
* A byte buffer is either direct or non-direct. Given a
* direct byte buffer, the Java virtual machine will make a best effort to
* perform native I/O operations directly upon it. That is, it will attempt to
* avoid copying the buffer's content to (or from) an intermediate buffer
* before (or after) each invocation of one of the underlying operating
* system's native I/O operations.
*
*
A direct byte buffer may be created by invoking the {@link
* #allocateDirect(int) allocateDirect} factory method of this class. The
* buffers returned by this method typically have somewhat higher allocation
* and deallocation costs than non-direct buffers. The contents of direct
* buffers may reside outside of the normal garbage-collected heap, and so
* their impact upon the memory footprint of an application might not be
* obvious. It is therefore recommended that direct buffers be allocated
* primarily for large, long-lived buffers that are subject to the underlying
* system's native I/O operations. In general it is best to allocate direct
* buffers only when they yield a measurable gain in program performance.
*
*
A direct byte buffer may also be created by {@link
* java.nio.channels.FileChannel#map mapping} a region of a file
* directly into memory. An implementation of the Java platform may optionally
* support the creation of direct byte buffers from native code via JNI. If an
* instance of one of these kinds of buffers refers to an inaccessible region
* of memory then an attempt to access that region will not change the buffer's
* content and will cause an unspecified exception to be thrown either at the
* time of the access or at some later time.
*
*
Whether a byte buffer is direct or non-direct may be determined by
* invoking its {@link #isDirect isDirect} method. This method is provided so
* that explicit buffer management can be done in performance-critical code.
*
*
*
*
Access to binary data
*
* This class defines methods for reading and writing values of all other
* primitive types, except {@code boolean}. Primitive values are translated
* to (or from) sequences of bytes according to the buffer's current byte
* order, which may be retrieved and modified via the {@link #order order}
* methods. Specific byte orders are represented by instances of the {@link
* ByteOrder} class. The initial order of a byte buffer is always {@link
* ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
*
*
For access to heterogeneous binary data, that is, sequences of values of
* different types, this class defines a family of absolute and relative
* get and put methods for each type. For 32-bit floating-point
* values, for example, this class defines:
*
*
* float {@link #getFloat()}
* float {@link #getFloat(int) getFloat(int index)}
* void {@link #putFloat(float) putFloat(float f)}
* void {@link #putFloat(int,float) putFloat(int index, float f)}
*
* Corresponding methods are defined for the types {@code char,
* short, int, long}, and {@code double}. The index
* parameters of the absolute get and put methods are in terms of
* bytes rather than of the type being read or written.
*
*
*
*
For access to homogeneous binary data, that is, sequences of values of
* the same type, this class defines methods that can create views of a
* given byte buffer. A view buffer is simply another buffer whose
* content is backed by the byte buffer. Changes to the byte buffer's content
* will be visible in the view buffer, and vice versa; the two buffers'
* position, limit, and mark values are independent. The {@link
* #asFloatBuffer() asFloatBuffer} method, for example, creates an instance of
* the {@link FloatBuffer} class that is backed by the byte buffer upon which
* the method is invoked. Corresponding view-creation methods are defined for
* the types {@code char, short, int, long}, and {@code double}.
*
*
View buffers have three important advantages over the families of
* type-specific get and put methods described above:
*
*
*
* A view buffer is indexed not in terms of bytes but rather in terms
* of the type-specific size of its values;
A view buffer provides relative bulk get and put
* methods that can transfer contiguous sequences of values between a buffer
* and an array or some other buffer of the same type; and
A view buffer is potentially much more efficient because it will
* be direct if, and only if, its backing byte buffer is direct.
*
* The byte order of a view buffer is fixed to be that of its byte buffer
* at the time that the view is created.
*
#end[byte]
*
#if[!byte]
*
* Like a byte buffer, $a$ $type$ buffer is either direct or non-direct. A
* $type$ buffer created via the {@code wrap} methods of this class will
* be non-direct. $A$ $type$ 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
* $a$ $type$ buffer is direct may be determined by invoking the {@link
* #isDirect isDirect} method.
*
#end[!byte]
*
#if[char]
*
* This class implements the {@link CharSequence} interface so that
* character buffers may be used wherever character sequences are accepted, for
* example in the regular-expression package {@link java.util.regex}.
* The methods defined by {@code CharSequence} operate relative to the current
* position of the buffer when they are invoked.
*
*
#end[char]
*
#if[byte]
* Invocation chaining
#end[byte]
*
* 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.
*
#if[byte]
*
* The sequence of statements
*
*
* bb.putInt(0xCAFEBABE);
* bb.putShort(3);
* bb.putShort(45);
*
* can, for example, be replaced by the single statement
*
*
* bb.putInt(0xCAFEBABE).putShort(3).putShort(45);
*
#end[byte]
#if[char]
*
* The sequence of statements
*
*
* cb.put("text/");
* cb.put(subtype);
* cb.put("; charset=");
* cb.put(enc);
*
* can, for example, be replaced by the single statement
*
*
* cb.put("text/").put(subtype).put("; charset=").put(enc);
*
#end[char]
*
*
* @author Mark Reinhold
* @author JSR-51 Expert Group
* @since 1.4
*/
public abstract class $Type$Buffer
extends Buffer
implements Comparable<$Type$Buffer>{#if[char]?, Appendable, CharSequence, Readable}
{
// Cached array base offset
private static final long ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset($type$[].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 $type$[] 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
//
$Type$Buffer(int mark, int pos, int lim, int cap, // package-private
$type$[] 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
//
$Type$Buffer(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
//
$Type$Buffer($type$[] hb, long addr, int cap, MemorySegmentProxy segment) { // package-private
super(addr, cap, segment);
this.hb = hb;
this.offset = 0;
}
@Override
Object base() {
return hb;
}
#if[byte]
/**
* Allocates a new direct $type$ buffer.
*
* 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
* {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}. Whether or not it has a
* {@link #hasArray backing array} is unspecified.
*
* @param capacity
* The new buffer's capacity, in $type$s
*
* @return The new $type$ buffer
*
* @throws IllegalArgumentException
* If the {@code capacity} is a negative integer
*/
public static $Type$Buffer allocateDirect(int capacity) {
return new Direct$Type$Buffer(capacity);
}
#end[byte]
/**
* Allocates a new $type$ buffer.
*
*
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
#if[byte]
* {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
#else[byte]
* the {@link ByteOrder#nativeOrder native order} of the underlying
* hardware.
#end[byte]
* 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 $type$s
*
* @return The new $type$ buffer
*
* @throws IllegalArgumentException
* If the {@code capacity} is a negative integer
*/
public static $Type$Buffer allocate(int capacity) {
if (capacity < 0)
throw createCapacityException(capacity);
return new Heap$Type$Buffer(capacity, capacity, null);
}
/**
* Wraps $a$ $type$ array into a buffer.
*
*
The new buffer will be backed by the given $type$ 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
#if[byte]
* {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
#else[byte]
* the {@link ByteOrder#nativeOrder native order} of the underlying
* hardware.
#end[byte]
* Its {@link #array backing array} will be the given array, and
* its {@link #arrayOffset array offset} will be zero.
*
* @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 $type$ buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code offset} and {@code length}
* parameters do not hold
*/
public static $Type$Buffer wrap($type$[] array,
int offset, int length)
{
try {
return new Heap$Type$Buffer(array, offset, length, null);
} catch (IllegalArgumentException x) {
throw new IndexOutOfBoundsException();
}
}
/**
* Wraps $a$ $type$ array into a buffer.
*
* The new buffer will be backed by the given $type$ 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
#if[byte]
* {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
#else[byte]
* the {@link ByteOrder#nativeOrder native order} of the underlying
* hardware.
#end[byte]
* Its {@link #array backing array} will be the given array, and its
* {@link #arrayOffset array offset} will be zero.
*
* @param array
* The array that will back this buffer
*
* @return The new $type$ buffer
*/
public static $Type$Buffer wrap($type$[] array) {
return wrap(array, 0, array.length);
}
#if[char]
/**
* Attempts to read characters into the specified character buffer.
* The buffer is used as a repository of characters as-is: the only
* changes made are the results of a put operation. No flipping or
* rewinding of the buffer is performed.
*
* @param target the buffer to read characters into
* @return The number of characters added to the buffer, or
* -1 if this source of characters is at its end
* @throws IOException if an I/O error occurs
* @throws ReadOnlyBufferException if target is a read only buffer
* @since 1.5
*/
public int read(CharBuffer target) throws IOException {
// Determine the number of bytes n that can be transferred
int limit = limit();
int pos = position();
int remaining = limit - pos;
assert remaining >= 0;
if (remaining <= 0) // include equality condition when remaining == 0
return -1;
int targetRemaining = target.remaining();
assert targetRemaining >= 0;
if (targetRemaining <= 0) // include condition targetRemaining == 0
return 0;
int n = Math.min(remaining, targetRemaining);
// Set source limit to prevent target overflow
if (targetRemaining < remaining)
limit(pos + n);
try {
if (n > 0)
target.put(this);
} finally {
limit(limit); // restore real limit
}
return n;
}
/**
* Wraps a character sequence into a buffer.
*
* The content of the new, read-only buffer will be the content of the
* given character sequence. The buffer's capacity will be
* {@code csq.length()}, its position will be {@code start}, its limit
* will be {@code end}, and its mark will be undefined.
*
* @param csq
* The character sequence from which the new character buffer is to
* be created
*
* @param start
* The index of the first character to be used;
* must be non-negative and no larger than {@code csq.length()}.
* The new buffer's position will be set to this value.
*
* @param end
* The index of the character following the last character to be
* used; must be no smaller than {@code start} and no larger
* than {@code csq.length()}.
* The new buffer's limit will be set to this value.
*
* @return The new character buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code start} and {@code end}
* parameters do not hold
*/
public static CharBuffer wrap(CharSequence csq, int start, int end) {
try {
return new StringCharBuffer(csq, start, end);
} catch (IllegalArgumentException x) {
throw new IndexOutOfBoundsException();
}
}
/**
* Wraps a character sequence into a buffer.
*
* The content of the new, read-only buffer will be the content of the
* given character sequence. The new buffer's capacity and limit will be
* {@code csq.length()}, its position will be zero, and its mark will be
* undefined.
*
* @param csq
* The character sequence from which the new character buffer is to
* be created
*
* @return The new character buffer
*/
public static CharBuffer wrap(CharSequence csq) {
return wrap(csq, 0, csq.length());
}
#end[char]
/**
* Creates a new $type$ buffer whose content is a shared subsequence of
* this buffer's content.
*
* 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.
*
*
The new buffer's position will be zero, its capacity and its limit
* will be the number of $type$s remaining in this buffer, its mark will be
* undefined, and its byte order will be
#if[byte]
* {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
#else[byte]
* identical to that of this buffer.
#end[byte]
* 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.
*
* @return The new $type$ buffer
#if[byte]
*
* @see #alignedSlice(int)
#end[byte]
*/
@Override
public abstract $Type$Buffer slice();
/**
* Creates a new $type$ buffer whose content is a shared subsequence of
* this buffer's content.
*
* 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.
*
*
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
#if[byte]
* {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
#else[byte]
* identical to that of this buffer.
#end[byte]
* 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.
*
* @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 $Type$Buffer slice(int index, int length);
/**
* Creates a new $type$ buffer that shares this buffer's content.
*
* 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.
*
*
The new buffer's capacity, limit, position,
#if[byte]
* and mark values will be identical to those of this buffer, and its byte
* order will be {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
#else[byte]
* mark values, and byte order will be identical to those of this buffer.
#end[byte]
* 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.
*
* @return The new $type$ buffer
*/
@Override
public abstract $Type$Buffer duplicate();
/**
* Creates a new, read-only $type$ buffer that shares this buffer's
* content.
*
* 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.
*
*
The new buffer's capacity, limit, position,
#if[byte]
* and mark values will be identical to those of this buffer, and its byte
* order will be {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
#else[byte]
* mark values, and byte order will be identical to those of this buffer.
#end[byte]
*
*
If this buffer is itself read-only then this method behaves in
* exactly the same way as the {@link #duplicate duplicate} method.
*
* @return The new, read-only $type$ buffer
*/
public abstract $Type$Buffer asReadOnlyBuffer();
// -- Singleton get/put methods --
/**
* Relative get method. Reads the $type$ at this buffer's
* current position, and then increments the position.
*
* @return The $type$ at the buffer's current position
*
* @throws BufferUnderflowException
* If the buffer's current position is not smaller than its limit
*/
public abstract $type$ get();
/**
* Relative put method (optional operation).
*
* Writes the given $type$ into this buffer at the current
* position, and then increments the position.
*
* @param $x$
* The $type$ 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 $Type$Buffer put($type$ $x$);
/**
* Absolute get method. Reads the $type$ at the given
* index.
*
* @param index
* The index from which the $type$ will be read
*
* @return The $type$ at the given index
*
* @throws IndexOutOfBoundsException
* If {@code index} is negative
* or not smaller than the buffer's limit
*/
public abstract $type$ get(int index);
#if[streamableType]
/**
* Absolute get method. Reads the $type$ at the given
* index without any validation of the index.
*
* @param index
* The index from which the $type$ will be read
*
* @return The $type$ at the given index
*/
abstract $type$ getUnchecked(int index); // package-private
#end[streamableType]
/**
* Absolute put method (optional operation).
*
* Writes the given $type$ into this buffer at the given
* index.
*
* @param index
* The index at which the $type$ will be written
*
* @param $x$
* The $type$ 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 $Type$Buffer put(int index, $type$ $x$);
// -- Bulk get operations --
/**
* Relative bulk get method.
*
* This method transfers $type$s from this buffer into the given
* destination array. If there are fewer $type$s remaining in the
* buffer than are required to satisfy the request, that is, if
* {@code length} {@code >} {@code remaining()}, then no
* $type$s are transferred and a {@link BufferUnderflowException} is
* thrown.
*
*
Otherwise, this method copies {@code length} $type$s 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}.
*
*
In other words, an invocation of this method of the form
* src.get(dst, off, len) has exactly the same effect as
* the loop
*
*
{@code
* for (int i = off; i < off + len; i++)
* dst[i] = src.get();
* }
*
* except that it first checks that there are sufficient $type$s in
* this buffer and it is potentially much more efficient.
*
* @param dst
* The array into which $type$s are to be written
*
* @param offset
* The offset within the array of the first $type$ to be
* written; must be non-negative and no larger than
* {@code dst.length}
*
* @param length
* The maximum number of $type$s 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} $type$s
* remaining in this buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code offset} and {@code length}
* parameters do not hold
*/
public $Type$Buffer get($type$[] 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 get method.
*
* This method transfers $type$s 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
*
*
* src.get(a, 0, a.length)
*
* @param dst
* The destination array
*
* @return This buffer
*
* @throws BufferUnderflowException
* If there are fewer than {@code length} $type$s
* remaining in this buffer
*/
public $Type$Buffer get($type$[] dst) {
return get(dst, 0, dst.length);
}
/**
* Absolute bulk get method.
*
* This method transfers {@code length} $type$s 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.
*
*
An invocation of this method of the form
* src.get(index, dst, offset, length)
* 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:
*
*
{@code
* for (int i = offset, j = index; i < offset + length; i++, j++)
* dst[i] = src.get(j);
* }
*
* @param index
* The index in this buffer from which the first $type$ 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 $type$ to be
* written; must be non-negative and less than
* {@code dst.length}
*
* @param length
* The number of $type$s 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 $Type$Buffer get(int index, $type$[] 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 get method.
*
* This method transfers $type$s from this buffer into the given
* destination array. The position of this buffer is unchanged. An
* invocation of this method of the form
* src.get(index, dst) behaves in exactly the same
* way as the invocation:
*
*
* src.get(index, dst, 0, dst.length)
*
* @param index
* The index in this buffer from which the first $type$ 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 $Type$Buffer get(int index, $type$[] dst) {
return get(index, dst, 0, dst.length);
}
private $Type$Buffer getArray(int index, $type$[] dst, int offset, int length) {
if (
#if[char]
isAddressable() &&
#end[char]
((long)length << $LG_BYTES_PER_VALUE$) > Bits.JNI_COPY_TO_ARRAY_THRESHOLD) {
long bufAddr = address + ((long)index << $LG_BYTES_PER_VALUE$);
long dstOffset =
ARRAY_BASE_OFFSET + ((long)offset << $LG_BYTES_PER_VALUE$);
long len = (long)length << $LG_BYTES_PER_VALUE$;
try {
#if[!byte]
if (order() != ByteOrder.nativeOrder())
SCOPED_MEMORY_ACCESS.copySwapMemory(
scope(), null, base(), bufAddr,
dst, dstOffset, len, $Fulltype$.BYTES);
else
#end[!byte]
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 put method (optional operation).
*
* This method transfers the $type$s remaining in the given source
* buffer into this buffer. If there are more $type$s remaining in the
* source buffer than in this buffer, that is, if
* {@code src.remaining()} {@code >} {@code remaining()},
* then no $type$s are transferred and a {@link
* BufferOverflowException} is thrown.
*
*
Otherwise, this method copies
* n = {@code src.remaining()} $type$s from the given
* buffer into this buffer, starting at each buffer's current position.
* The positions of both buffers are then incremented by n.
*
*
In other words, an invocation of this method of the form
* {@code dst.put(src)} has exactly the same effect as the loop
*
*
* while (src.hasRemaining())
* dst.put(src.get());
*
* 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 $type$s 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 $type$s in the source buffer
*
* @throws IllegalArgumentException
* If the source buffer is this buffer
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public $Type$Buffer put($Type$Buffer 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 put method (optional operation).
*
* This method transfers {@code length} $type$s 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.
*
*
In other words, an invocation of this method of the form
* dst.put(index, src, offset, length)
* has exactly the same effect as the loop
*
*
{@code
* for (int i = offset, j = index; i < offset + length; i++, j++)
* dst.put(j, src.get(i));
* }
*
* 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 $type$ will be
* written; must be non-negative and less than {@code limit()}
*
* @param src
* The buffer from which $type$s are to be read
*
* @param offset
* The index within the source buffer of the first $type$ to be
* read; must be non-negative and less than {@code src.limit()}
*
* @param length
* The number of $type$s 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 $Type$Buffer put(int index, $Type$Buffer 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, $Type$Buffer src, int srcPos, int n) {
#if[rw]
Object srcBase = src.base();
#if[char]
if (src.isAddressable()) {
#else[char]
assert srcBase != null || src.isDirect();
#end[char]
Object base = base();
assert base != null || isDirect();
long srcAddr = src.address + ((long)srcPos << $LG_BYTES_PER_VALUE$);
long addr = address + ((long)pos << $LG_BYTES_PER_VALUE$);
long len = (long)n << $LG_BYTES_PER_VALUE$;
try {
#if[!byte]
if (this.order() != src.order())
SCOPED_MEMORY_ACCESS.copySwapMemory(
src.scope(), scope(), srcBase, srcAddr,
base, addr, len, $Fulltype$.BYTES);
else
#end[!byte]
SCOPED_MEMORY_ACCESS.copyMemory(
src.scope(), scope(), srcBase, srcAddr,
base, addr, len);
} finally {
Reference.reachabilityFence(src);
Reference.reachabilityFence(this);
}
#if[char]
} else { // src.isAddressable() == false
assert StringCharBuffer.class.isInstance(src);
int posMax = pos + n;
for (int i = pos, j = srcPos; i < posMax; i++, j++)
put(i, src.get(j));
}
#end[char]
#else[rw]
throw new ReadOnlyBufferException();
#end[rw]
}
/**
* Relative bulk put method (optional operation).
*
* This method transfers $type$s into this buffer from the given
* source array. If there are more $type$s to be copied from the array
* than remain in this buffer, that is, if
* {@code length} {@code >} {@code remaining()}, then no
* $type$s are transferred and a {@link BufferOverflowException} is
* thrown.
*
*
Otherwise, this method copies {@code length} $type$s 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}.
*
*
In other words, an invocation of this method of the form
* dst.put(src, off, len) has exactly the same effect as
* the loop
*
*
{@code
* for (int i = off; i < off + len; i++)
* dst.put(src[i]);
* }
*
* 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 $type$s are to be read
*
* @param offset
* The offset within the array of the first $type$ to be read;
* must be non-negative and no larger than {@code src.length}
*
* @param length
* The number of $type$s 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 $Type$Buffer put($type$[] 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 put method (optional operation).
*
* This method transfers the entire content of the given source
* $type$ 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
*
*
* dst.put(a, 0, a.length)
*
* @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 $Type$Buffer put($type$[] src) {
return put(src, 0, src.length);
}
/**
* Absolute bulk put method (optional operation).
*
* This method transfers {@code length} $type$s 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.
*
*
An invocation of this method of the form
* dst.put(index, src, offset, length)
* 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:
*
*
{@code
* for (int i = offset, j = index; i < offset + length; i++, j++)
* dst.put(j, src[i]);
* }
*
* @param index
* The index in this buffer at which the first $type$ will be
* written; must be non-negative and less than {@code limit()}
*
* @param src
* The array from which $type$s are to be read
*
* @param offset
* The offset within the array of the first $type$ to be read;
* must be non-negative and less than {@code src.length}
*
* @param length
* The number of $type$s 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 $Type$Buffer put(int index, $type$[] 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 put method (optional operation).
*
* This method copies $type$s into this buffer from the given source
* array. The position of this buffer is unchanged. An invocation of this
* method of the form dst.put(index, src)
* behaves in exactly the same way as the invocation:
*
*
* dst.put(index, src, 0, src.length);
*
* @param index
* The index in this buffer at which the first $type$ will be
* written; must be non-negative and less than {@code limit()}
*
* @param src
* The array from which $type$s 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 $Type$Buffer put(int index, $type$[] src) {
return put(index, src, 0, src.length);
}
private $Type$Buffer putArray(int index, $type$[] src, int offset, int length) {
#if[rw]
if (
#if[char]
isAddressable() &&
#end[char]
((long)length << $LG_BYTES_PER_VALUE$) > Bits.JNI_COPY_FROM_ARRAY_THRESHOLD) {
long bufAddr = address + ((long)index << $LG_BYTES_PER_VALUE$);
long srcOffset =
ARRAY_BASE_OFFSET + ((long)offset << $LG_BYTES_PER_VALUE$);
long len = (long)length << $LG_BYTES_PER_VALUE$;
try {
#if[!byte]
if (order() != ByteOrder.nativeOrder())
SCOPED_MEMORY_ACCESS.copySwapMemory(
null, scope(), src, srcOffset,
base(), bufAddr, len, $Fulltype$.BYTES);
else
#end[!byte]
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;
#else[rw]
throw new ReadOnlyBufferException();
#end[rw]
}
#if[char]
/**
* Relative bulk put method (optional operation).
*
* This method transfers $type$s from the given string into this
* buffer. If there are more $type$s to be copied from the string than
* remain in this buffer, that is, if
* end - start {@code >} {@code remaining()},
* then no $type$s are transferred and a {@link
* BufferOverflowException} is thrown.
*
*
Otherwise, this method copies
* n = {@code end} - {@code start} $type$s
* from the given string into this buffer, starting at the given
* {@code start} index and at the current position of this buffer. The
* position of this buffer is then incremented by n.
*
*
In other words, an invocation of this method of the form
* dst.put(src, start, end) has exactly the same effect
* as the loop
*
*
{@code
* for (int i = start; i < end; i++)
* dst.put(src.charAt(i));
* }
*
* except that it first checks that there is sufficient space in this
* buffer and it is potentially much more efficient.
*
* @param src
* The string from which $type$s are to be read
*
* @param start
* The offset within the string of the first $type$ to be read;
* must be non-negative and no larger than
* {@code string.length()}
*
* @param end
* The offset within the string of the last $type$ to be read,
* plus one; must be non-negative and no larger than
* {@code string.length()}
*
* @return This buffer
*
* @throws BufferOverflowException
* If there is insufficient space in this buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on the {@code start} and {@code end}
* parameters do not hold
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public $Type$Buffer put(String src, int start, int end) {
Objects.checkFromIndexSize(start, end - start, src.length());
if (isReadOnly())
throw new ReadOnlyBufferException();
if (end - start > remaining())
throw new BufferOverflowException();
for (int i = start; i < end; i++)
this.put(src.charAt(i));
return this;
}
/**
* Relative bulk put method (optional operation).
*
* This method transfers the entire content of the given source string
* into this buffer. An invocation of this method of the form
* {@code dst.put(s)} behaves in exactly the same way as the invocation
*
*
* dst.put(s, 0, s.length())
*
* @param src
* The source string
*
* @return This buffer
*
* @throws BufferOverflowException
* If there is insufficient space in this buffer
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public final $Type$Buffer put(String src) {
return put(src, 0, src.length());
}
#end[char]
// -- Other stuff --
/**
* Tells whether or not this buffer is backed by an accessible $type$
* array.
*
* If this method returns {@code true} then the {@link #array() array}
* and {@link #arrayOffset() arrayOffset} methods may safely be invoked.
*
*
* @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 $type$ array that backs this
* buffer (optional operation).
*
* Modifications to this buffer's content will cause the returned
* array's content to be modified, and vice versa.
*
*
Invoke the {@link #hasArray hasArray} method before invoking this
* method in order to ensure that this buffer has an accessible backing
* array.
*
* @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 $type$[] 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 (optional operation).
*
* If this buffer is backed by an array then buffer position p
* corresponds to array index p + {@code arrayOffset()}.
*
*
Invoke the {@link #hasArray hasArray} method before invoking this
* method in order to ensure that this buffer has an accessible backing
* array.
*
* @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
#if[!byte]
final
#end[!byte]
$Type$Buffer position(int newPosition) {
super.position(newPosition);
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
#if[!byte]
final
#end[!byte]
$Type$Buffer limit(int newLimit) {
super.limit(newLimit);
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
#if[!byte]
final
#end[!byte]
$Type$Buffer mark() {
super.mark();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
#if[!byte]
final
#end[!byte]
$Type$Buffer reset() {
super.reset();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
#if[!byte]
final
#end[!byte]
$Type$Buffer clear() {
super.clear();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
#if[!byte]
final
#end[!byte]
$Type$Buffer flip() {
super.flip();
return this;
}
/**
* {@inheritDoc}
*/
@Override
public
#if[!byte]
final
#end[!byte]
$Type$Buffer rewind() {
super.rewind();
return this;
}
/**
* Compacts this buffer (optional operation).
*
* The $type$s between the buffer's current position and its limit,
* if any, are copied to the beginning of the buffer. That is, the
* $type$ at index p = {@code position()} is copied
* to index zero, the $type$ at index p + 1 is copied
* to index one, and so forth until the $type$ at index
* {@code limit()} - 1 is copied to index
* n = {@code limit()} - {@code 1} - p.
* The buffer's position is then set to n+1 and its limit is set to
* its capacity. The mark, if defined, is discarded.
*
*
The buffer's position is set to the number of $type$s copied,
* rather than to zero, so that an invocation of this method can be
* followed immediately by an invocation of another relative put
* method.
*
#if[byte]
*
* Invoke this method after writing data from a buffer in case the
* write was incomplete. The following loop, for example, copies bytes
* from one channel to another via the buffer {@code buf}:
*
*
{@code
* buf.clear(); // Prepare buffer for use
* while (in.read(buf) >= 0 || buf.position != 0) {
* buf.flip();
* out.write(buf);
* buf.compact(); // In case of partial write
* }
* }
*
#end[byte]
*
* @return This buffer
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*/
public abstract $Type$Buffer compact();
/**
* Tells whether or not this $type$ buffer is direct.
*
* @return {@code true} if, and only if, this buffer is direct
*/
public abstract boolean isDirect();
#if[char]
/**
* Tells whether this buffer has addressable memory, e.g., a Java array or
* a native address. This method returns {@code true}. Subclasses such as
* {@code StringCharBuffer}, which wraps a {@code CharSequence}, should
* override this method to return {@code false}.
*
* @return {@code true} if, and only, this buffer has addressable memory
*/
boolean isAddressable() {
return true;
}
#end[char]
#if[!char]
/**
* 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()
+ "]";
}
#end[!char]
// ## Should really use unchecked accessors here for speed
/**
* Returns the current hash code of this buffer.
*
* The hash code of a $type$ 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}.
*
*
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.
*
* @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--)
#if[int]
h = 31 * h + get(i);
#else[int]
h = 31 * h + (int)get(i);
#end[int]
return h;
}
/**
* Tells whether or not this buffer is equal to another object.
*
* Two $type$ buffers are equal if, and only if,
*
*
*
* They have the same element type,
They have the same number of remaining elements, and
*
The two sequences of remaining elements, considered
* independently of their starting positions, are pointwise equal.
#if[floatingPointType]
* This method considers two $type$ elements {@code a} and {@code b}
* to be equal if
* {@code (a == b) || ($Fulltype$.isNaN(a) && $Fulltype$.isNaN(b))}.
* The values {@code -0.0} and {@code +0.0} are considered to be
* equal, unlike {@link $Fulltype$#equals(Object)}.
#end[floatingPointType]
*
*
* A $type$ buffer is not equal to any other type of object.
*
* @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 $Type$Buffer))
return false;
$Type$Buffer that = ($Type$Buffer)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.
*
* Two $type$ buffers are compared by comparing their sequences of
* remaining elements lexicographically, without regard to the starting
* position of each sequence within its corresponding buffer.
#if[floatingPointType]
* Pairs of {@code $type$} elements are compared as if by invoking
* {@link $Fulltype$#compare($type$,$type$)}, except that
* {@code -0.0} and {@code 0.0} are considered to be equal.
* {@code $Fulltype$.NaN} is considered by this method to be equal
* to itself and greater than all other {@code $type$} values
* (including {@code $Fulltype$.POSITIVE_INFINITY}).
#else[floatingPointType]
* Pairs of {@code $type$} elements are compared as if by invoking
* {@link $Fulltype$#compare($type$,$type$)}.
#end[floatingPointType]
*
*
A $type$ 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($Type$Buffer 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($type$ x, $type$ y) {
#if[floatingPointType]
return ((x < y) ? -1 :
(x > y) ? +1 :
(x == y) ? 0 :
$Fulltype$.isNaN(x) ? ($Fulltype$.isNaN(y) ? 0 : +1) : -1);
#else[floatingPointType]
return $Fulltype$.compare(x, y);
#end[floatingPointType]
}
/**
* 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).
*
*
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($Type$Buffer 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 --
#if[char]
/**
* Returns a string containing the characters in this buffer.
*
*
The first character of the resulting string will be the character at
* this buffer's position, while the last character will be the character
* at index {@code limit()} - 1. Invoking this method does not
* change the buffer's position.
*
* @return The specified string
*/
public String toString() {
return toString(position(), limit());
}
abstract String toString(int start, int end); // package-private
// --- Methods to support CharSequence ---
/**
* Returns the length of this character buffer.
*
* When viewed as a character sequence, the length of a character
* buffer is simply the number of characters between the position
* (inclusive) and the limit (exclusive); that is, it is equivalent to
* {@code remaining()}.
*
* @return The length of this character buffer
*/
public final int length() {
return remaining();
}
/**
* Returns {@code true} if this character buffer is empty.
*
* @return {@code true} if there are {@code 0} remaining characters,
* otherwise {@code false}
*
* @since 15
*/
public final boolean isEmpty() {
return remaining() == 0;
}
/**
* Reads the character at the given index relative to the current
* position.
*
* @param index
* The index of the character to be read, relative to the position;
* must be non-negative and smaller than {@code remaining()}
*
* @return The character at index
* position() + index
*
* @throws IndexOutOfBoundsException
* If the preconditions on {@code index} do not hold
*/
public final char charAt(int index) {
return get(position() + checkIndex(index, 1));
}
/**
* Creates a new character buffer that represents the specified subsequence
* of this buffer, relative to the current position.
*
* The new buffer will share this buffer's content; that is, if the
* content of this buffer is mutable then modifications to one buffer will
* cause the other to be modified. The new buffer's capacity will be that
* of this buffer, its position will be
* {@code position()} + {@code start}, its limit will be
* {@code position()} + {@code end}, 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.
*
* @param start
* The index, relative to the current position, of the first
* character in the subsequence; must be non-negative and no larger
* than {@code remaining()}
*
* @param end
* The index, relative to the current position, of the character
* following the last character in the subsequence; must be no
* smaller than {@code start} and no larger than
* {@code remaining()}
*
* @return The new character buffer
*
* @throws IndexOutOfBoundsException
* If the preconditions on {@code start} and {@code end}
* do not hold
*/
public abstract CharBuffer subSequence(int start, int end);
// --- Methods to support Appendable ---
/**
* Appends the specified character sequence to this
* buffer (optional operation).
*
* An invocation of this method of the form {@code dst.append(csq)}
* behaves in exactly the same way as the invocation
*
*
* dst.put(csq.toString())
*
* Depending on the specification of {@code toString} for the
* character sequence {@code csq}, the entire sequence may not be
* appended. For instance, invoking the {@link $Type$Buffer#toString()
* toString} method of a character buffer will return a subsequence whose
* content depends upon the buffer's position and limit.
*
* @param csq
* The character sequence to append. If {@code csq} is
* {@code null}, then the four characters {@code "null"} are
* appended to this character buffer.
*
* @return This buffer
*
* @throws BufferOverflowException
* If there is insufficient space in this buffer
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*
* @since 1.5
*/
public $Type$Buffer append(CharSequence csq) {
if (csq == null)
return put("null");
else
return put(csq.toString());
}
/**
* Appends a subsequence of the specified character sequence to this
* buffer (optional operation).
*
*
An invocation of this method of the form {@code dst.append(csq, start,
* end)} when {@code csq} is not {@code null}, behaves in exactly the
* same way as the invocation
*
*
* dst.put(csq.subSequence(start, end).toString())
*
* @param csq
* The character sequence from which a subsequence will be
* appended. If {@code csq} is {@code null}, then characters
* will be appended as if {@code csq} contained the four
* characters {@code "null"}.
*
* @return This buffer
*
* @throws BufferOverflowException
* If there is insufficient space in this buffer
*
* @throws IndexOutOfBoundsException
* If {@code start} or {@code end} are negative, {@code start}
* is greater than {@code end}, or {@code end} is greater than
* {@code csq.length()}
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*
* @since 1.5
*/
public $Type$Buffer append(CharSequence csq, int start, int end) {
CharSequence cs = (csq == null ? "null" : csq);
return put(cs.subSequence(start, end).toString());
}
/**
* Appends the specified $type$ to this
* buffer (optional operation).
*
* An invocation of this method of the form {@code dst.append($x$)}
* behaves in exactly the same way as the invocation
*
*
* dst.put($x$)
*
* @param $x$
* The 16-bit $type$ to append
*
* @return This buffer
*
* @throws BufferOverflowException
* If there is insufficient space in this buffer
*
* @throws ReadOnlyBufferException
* If this buffer is read-only
*
* @since 1.5
*/
public $Type$Buffer append($type$ $x$) {
return put($x$);
}
#end[char]
// -- Other byte stuff: Access to binary data --
#if[!byte]
/**
* Retrieves this buffer's byte order.
*
* The byte order of $a$ $type$ buffer created by allocation or by
* wrapping an existing {@code $type$} array is the {@link
* ByteOrder#nativeOrder native order} of the underlying
* hardware. The byte order of $a$ $type$ buffer created as a view of a byte buffer is that of the
* byte buffer at the moment that the view is created.
*
* @return This buffer's byte order
*/
public abstract ByteOrder order();
#end[!byte]
#if[char]
// The order or null if the buffer does not cover a memory region,
// such as StringCharBuffer
abstract ByteOrder charRegionOrder();
#end[char]
#if[byte]
boolean bigEndian // package-private
= true;
boolean nativeByteOrder // package-private
= (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN);
/**
* Retrieves this buffer's byte order.
*
* The byte order is used when reading or writing multibyte values, and
* when creating buffers that are views of this byte buffer. The order of
* a newly-created byte buffer is always {@link ByteOrder#BIG_ENDIAN
* BIG_ENDIAN}.
*
* @return This buffer's byte order
*/
public final ByteOrder order() {
return bigEndian ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN;
}
/**
* Modifies this buffer's byte order.
*
* @param bo
* The new byte order,
* either {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}
* or {@link ByteOrder#LITTLE_ENDIAN LITTLE_ENDIAN}
*
* @return This buffer
*/
public final $Type$Buffer order(ByteOrder bo) {
bigEndian = (bo == ByteOrder.BIG_ENDIAN);
nativeByteOrder =
(bigEndian == (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN));
return this;
}
/**
* Returns the memory address, pointing to the byte at the given index,
* modulo the given unit size.
*
* The return value is non-negative in the range of {@code 0}
* (inclusive) up to {@code unitSize} (exclusive), with zero indicating
* that the address of the byte at the index is aligned for the unit size,
* and a positive value that the address is misaligned for the unit size.
* If the address of the byte at the index is misaligned, the return value
* represents how much the index should be adjusted to locate a byte at an
* aligned address. Specifically, the index should either be decremented by
* the return value if the latter is not greater than {@code index}, or be
* incremented by the unit size minus the return value. Therefore given
*
* int value = alignmentOffset(index, unitSize)
* then the identities
*
* alignmentOffset(index - value, unitSize) == 0, value ≤ index
* and
*
* alignmentOffset(index + (unitSize - value), unitSize) == 0
* must hold.
*
* @apiNote
* This method may be utilized to determine if unit size bytes from an
* index can be accessed atomically, if supported by the native platform.
*
* @implNote
* This implementation throws {@code UnsupportedOperationException} for
* non-direct buffers when the given unit size is greater then {@code 8}.
*
* @param index
* The index to query for alignment offset, must be non-negative, no
* upper bounds check is performed
*
* @param unitSize
* The unit size in bytes, must be a power of {@code 2}
*
* @return The indexed byte's memory address modulo the unit size
*
* @throws IllegalArgumentException
* If the index is negative or the unit size is not a power of
* {@code 2}
*
* @throws UnsupportedOperationException
* If the native platform does not guarantee stable alignment offset
* values for the given unit size when managing the memory regions
* of buffers of the same kind as this buffer (direct or
* non-direct). For example, if garbage collection would result
* in the moving of a memory region covered by a non-direct buffer
* from one location to another and both locations have different
* alignment characteristics.
*
* @see #alignedSlice(int)
* @since 9
*/
public final int alignmentOffset(int index, int unitSize) {
if (index < 0)
throw new IllegalArgumentException("Index less than zero: " + index);
if (unitSize < 1 || (unitSize & (unitSize - 1)) != 0)
throw new IllegalArgumentException("Unit size not a power of two: " + unitSize);
if (unitSize > 8 && !isDirect())
throw new UnsupportedOperationException("Unit size unsupported for non-direct buffers: " + unitSize);
return (int) ((address + index) & (unitSize - 1));
}
/**
* Creates a new byte buffer whose content is a shared and aligned
* subsequence of this buffer's content.
*
* The content of the new buffer will start at this buffer's current
* position rounded up to the index of the nearest aligned byte for the
* given unit size, and end at this buffer's limit rounded down to the index
* of the nearest aligned byte for the given unit size.
* If rounding results in out-of-bound values then the new buffer's capacity
* and limit will be zero. If rounding is within bounds the following
* expressions will be true for a new buffer {@code nb} and unit size
* {@code unitSize}:
*
{@code
* nb.alignmentOffset(0, unitSize) == 0
* nb.alignmentOffset(nb.limit(), unitSize) == 0
* }
*
* 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.
*
*
The new buffer's position will be zero, its capacity and its limit
* will be the number of bytes remaining in this buffer or fewer subject to
* alignment, its mark will be undefined, and its byte order will be
* {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
*
* 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.
*
* @apiNote
* This method may be utilized to create a new buffer where unit size bytes
* from index, that is a multiple of the unit size, may be accessed
* atomically, if supported by the native platform.
*
* @implNote
* This implementation throws {@code UnsupportedOperationException} for
* non-direct buffers when the given unit size is greater then {@code 8}.
*
* @param unitSize
* The unit size in bytes, must be a power of {@code 2}
*
* @return The new byte buffer
*
* @throws IllegalArgumentException
* If the unit size not a power of {@code 2}
*
* @throws UnsupportedOperationException
* If the native platform does not guarantee stable aligned slices
* for the given unit size when managing the memory regions
* of buffers of the same kind as this buffer (direct or
* non-direct). For example, if garbage collection would result
* in the moving of a memory region covered by a non-direct buffer
* from one location to another and both locations have different
* alignment characteristics.
*
* @see #alignmentOffset(int, int)
* @see #slice()
* @since 9
*/
public final ByteBuffer alignedSlice(int unitSize) {
int pos = position();
int lim = limit();
int pos_mod = alignmentOffset(pos, unitSize);
int lim_mod = alignmentOffset(lim, unitSize);
// Round up the position to align with unit size
int aligned_pos = (pos_mod > 0)
? pos + (unitSize - pos_mod)
: pos;
// Round down the limit to align with unit size
int aligned_lim = lim - lim_mod;
if (aligned_pos > lim || aligned_lim < pos) {
aligned_pos = aligned_lim = pos;
}
return slice(aligned_pos, aligned_lim - aligned_pos);
}
// #BIN
//
// Binary-data access methods for short, char, int, long, float,
// and double will be inserted here
#end[byte]
#if[streamableType]
#if[char]
@Override
#end[char]
public $Streamtype$Stream $type$s() {
return StreamSupport.$streamtype$Stream(() -> new $Type$BufferSpliterator(this),
Buffer.SPLITERATOR_CHARACTERISTICS, false);
}
#end[streamableType]
}