| /* |
| * Copyright (c) 2000, 2008, 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. |
| */ |
| |
| package java.nio; |
| |
| import libcore.io.Memory; |
| |
| class ByteBufferAsDoubleBuffer |
| extends DoubleBuffer { // package-private |
| |
| protected final ByteBuffer bb; |
| protected final int offset; |
| private final ByteOrder order; |
| |
| ByteBufferAsDoubleBuffer(ByteBuffer bb, ByteOrder order) { |
| super(-1, 0, |
| bb.remaining() >> 3, |
| bb.remaining() >> 3); |
| this.bb = bb; |
| this.address = bb.address; |
| this.order = order; |
| int cap = this.capacity(); |
| this.limit(cap); |
| int pos = this.position(); |
| assert (pos <= cap); |
| offset = pos; |
| } |
| |
| ByteBufferAsDoubleBuffer(ByteBuffer bb, |
| int mark, int pos, int lim, int cap, |
| int off, ByteOrder order) { |
| super(mark, pos, lim, cap); |
| this.bb = bb; |
| this.address = bb.address; |
| this.order = order; |
| offset = off; |
| } |
| |
| public DoubleBuffer slice() { |
| int pos = this.position(); |
| int lim = this.limit(); |
| assert (pos <= lim); |
| int rem = (pos <= lim ? lim - pos : 0); |
| int off = (pos << 3) + offset; |
| assert (off >= 0); |
| return new ByteBufferAsDoubleBuffer(bb, -1, 0, rem, rem, off, order); |
| } |
| |
| public DoubleBuffer duplicate() { |
| return new ByteBufferAsDoubleBuffer(bb, |
| markValue(), |
| position(), |
| limit(), |
| capacity(), |
| offset, |
| order); |
| } |
| |
| public DoubleBuffer asReadOnlyBuffer() { |
| return new ByteBufferAsDoubleBuffer(bb.asReadOnlyBuffer(), |
| markValue(), |
| position(), |
| limit(), |
| capacity(), |
| offset, |
| order); |
| } |
| |
| protected int ix(int i) { |
| return (i << 3) + offset; |
| } |
| |
| public double get() { |
| return get(nextGetIndex()); |
| } |
| |
| public double get(int i) { |
| return bb.getDouble(ix(i)); |
| } |
| |
| public DoubleBuffer put(double x) { |
| put(nextPutIndex(), x); |
| return this; |
| } |
| |
| public DoubleBuffer put(int i, double x) { |
| bb.putDouble(ix(i), x); |
| return this; |
| } |
| |
| public DoubleBuffer compact() { |
| if (isReadOnly) { |
| throw new ReadOnlyBufferException(); |
| } |
| int pos = position(); |
| int lim = limit(); |
| assert (pos <= lim); |
| int rem = (pos <= lim ? lim - pos : 0); |
| if (!(bb instanceof DirectByteBuffer)) { |
| System.arraycopy(bb.array(), ix(pos), bb.array(), ix(0), rem << 3); |
| } else { |
| Memory.memmove(this, ix(0), this, ix(pos), rem << 3); |
| } |
| position(rem); |
| limit(capacity()); |
| discardMark(); |
| return this; |
| } |
| |
| public boolean isDirect() { |
| return bb.isDirect(); |
| } |
| |
| public boolean isReadOnly() { |
| return bb.isReadOnly; |
| } |
| |
| public ByteOrder order() { |
| return order; |
| } |
| } |