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HeapDoubleBuffer.java 6.41 KB
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Stefan authored 2021-03-18 23:35 +08:00 . init
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/*
* Copyright (c) 2000, 2016, 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
// -- This file was mechanically generated: Do not edit! -- //
package java.nio;
/**
* A read/write HeapDoubleBuffer.
*/
class HeapDoubleBuffer
extends DoubleBuffer
{
// Cached array base offset
private static final long ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset(double[].class);
// Cached array base offset
private static final long ARRAY_INDEX_SCALE = UNSAFE.arrayIndexScale(double[].class);
// For speed these fields are actually declared in X-Buffer;
// these declarations are here as documentation
/*
protected final double[] hb;
protected final int offset;
*/
HeapDoubleBuffer(int cap, int lim) { // package-private
super(-1, 0, lim, cap, new double[cap], 0);
/*
hb = new double[cap];
offset = 0;
*/
this.address = ARRAY_BASE_OFFSET;
}
HeapDoubleBuffer(double[] buf, int off, int len) { // package-private
super(-1, off, off + len, buf.length, buf, 0);
/*
hb = buf;
offset = 0;
*/
this.address = ARRAY_BASE_OFFSET;
}
protected HeapDoubleBuffer(double[] buf,
int mark, int pos, int lim, int cap,
int off)
{
super(mark, pos, lim, cap, buf, off);
/*
hb = buf;
offset = off;
*/
this.address = ARRAY_BASE_OFFSET + off * ARRAY_INDEX_SCALE;
}
public DoubleBuffer slice() {
return new HeapDoubleBuffer(hb,
-1,
0,
this.remaining(),
this.remaining(),
this.position() + offset);
}
public DoubleBuffer duplicate() {
return new HeapDoubleBuffer(hb,
this.markValue(),
this.position(),
this.limit(),
this.capacity(),
offset);
}
public DoubleBuffer asReadOnlyBuffer() {
return new HeapDoubleBufferR(hb,
this.markValue(),
this.position(),
this.limit(),
this.capacity(),
offset);
}
protected int ix(int i) {
return i + offset;
}
public double get() {
return hb[ix(nextGetIndex())];
}
public double get(int i) {
return hb[ix(checkIndex(i))];
}
public DoubleBuffer get(double[] dst, int offset, int length) {
checkBounds(offset, length, dst.length);
if (length > remaining())
throw new BufferUnderflowException();
System.arraycopy(hb, ix(position()), dst, offset, length);
position(position() + length);
return this;
}
public boolean isDirect() {
return false;
}
public boolean isReadOnly() {
return false;
}
public DoubleBuffer put(double x) {
hb[ix(nextPutIndex())] = x;
return this;
}
public DoubleBuffer put(int i, double x) {
hb[ix(checkIndex(i))] = x;
return this;
}
public DoubleBuffer put(double[] src, int offset, int length) {
checkBounds(offset, length, src.length);
if (length > remaining())
throw new BufferOverflowException();
System.arraycopy(src, offset, hb, ix(position()), length);
position(position() + length);
return this;
}
public DoubleBuffer put(DoubleBuffer src) {
if (src instanceof HeapDoubleBuffer) {
if (src == this)
throw createSameBufferException();
HeapDoubleBuffer sb = (HeapDoubleBuffer)src;
int n = sb.remaining();
if (n > remaining())
throw new BufferOverflowException();
System.arraycopy(sb.hb, sb.ix(sb.position()),
hb, ix(position()), n);
sb.position(sb.position() + n);
position(position() + n);
} else if (src.isDirect()) {
int n = src.remaining();
if (n > remaining())
throw new BufferOverflowException();
src.get(hb, ix(position()), n);
position(position() + n);
} else {
super.put(src);
}
return this;
}
public DoubleBuffer compact() {
System.arraycopy(hb, ix(position()), hb, ix(0), remaining());
position(remaining());
limit(capacity());
discardMark();
return this;
}
public ByteOrder order() {
return ByteOrder.nativeOrder();
}
}
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