/*

 * Copyright (c) 2000, 2018, 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.

 */

#warn This file is preprocessed before being compiled

package java.nio;

import java.io.FileDescriptor;

import java.lang.ref.Reference;

import jdk.internal.misc.VM;

import jdk.internal.ref.Cleaner;

import sun.nio.ch.DirectBuffer;

class Direct$Type$Buffer$RW$$BO$

#if[rw]

    extends {#if[byte]?Mapped$Type$Buffer:$Type$Buffer}

#else[rw]

    extends Direct$Type$Buffer$BO$

#end[rw]

    implements DirectBuffer

{

#if[rw]

    // Cached array base offset

    private static final long ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset($type$[].class);

    // Cached unaligned-access capability

    protected static final boolean UNALIGNED = Bits.unaligned();

    // Base address, used in all indexing calculations

    // NOTE: moved up to Buffer.java for speed in JNI GetDirectBufferAddress

    //    protected long address;

    // An object attached to this buffer. If this buffer is a view of another

    // buffer then we use this field to keep a reference to that buffer to

    // ensure that its memory isn't freed before we are done with it.

    private final Object att;

    public Object attachment() {

        return att;

    }

#if[byte]

    private static class Deallocator

        implements Runnable

    {

        private long address;

        private long size;

        private int capacity;

        private Deallocator(long address, long size, int capacity) {

            assert (address != 0);

            this.address = address;

            this.size = size;

            this.capacity = capacity;

        }

        public void run() {

            if (address == 0) {

                // Paranoia

                return;

            }

            UNSAFE.freeMemory(address);

            address = 0;

            Bits.unreserveMemory(size, capacity);

        }

    }

    private final Cleaner cleaner;

    public Cleaner cleaner() { return cleaner; }

#else[byte]

    public Cleaner cleaner() { return null; }

#end[byte]

#end[rw]

#if[byte]

    // Primary constructor

    //

    Direct$Type$Buffer$RW$(int cap) {                   // package-private

#if[rw]

        super(-1, 0, cap, cap);

        boolean pa = VM.isDirectMemoryPageAligned();

        int ps = Bits.pageSize();

        long size = Math.max(1L, (long)cap + (pa ? ps : 0));

        Bits.reserveMemory(size, cap);

        long base = 0;

        try {

            base = UNSAFE.allocateMemory(size);

        } catch (OutOfMemoryError x) {

            Bits.unreserveMemory(size, cap);

            throw x;

        }

        UNSAFE.setMemory(base, size, (byte) 0);

        if (pa && (base % ps != 0)) {

            // Round up to page boundary

            address = base + ps - (base & (ps - 1));

        } else {

            address = base;

        }

        cleaner = Cleaner.create(this, new Deallocator(base, size, cap));

        att = null;

#else[rw]

        super(cap);

        this.isReadOnly = true;

#end[rw]

    }

#if[rw]

    // Invoked to construct a direct ByteBuffer referring to the block of

    // memory. A given arbitrary object may also be attached to the buffer.

    //

    Direct$Type$Buffer(long addr, int cap, Object ob) {

        super(-1, 0, cap, cap);

        address = addr;

        cleaner = null;

        att = ob;

    }

    // Invoked only by JNI: NewDirectByteBuffer(void*, long)

    //

    private Direct$Type$Buffer(long addr, int cap) {

        super(-1, 0, cap, cap);

        address = addr;

        cleaner = null;

        att = null;

    }

#end[rw]

    // For memory-mapped buffers -- invoked by FileChannelImpl via reflection

    //

    protected Direct$Type$Buffer$RW$(int cap, long addr,

                                     FileDescriptor fd,

                                     Runnable unmapper)

    {

#if[rw]

        super(-1, 0, cap, cap, fd);

        address = addr;

        cleaner = Cleaner.create(this, unmapper);

        att = null;

#else[rw]

        super(cap, addr, fd, unmapper);

        this.isReadOnly = true;

#end[rw]

    }

#end[byte]

    // For duplicates and slices

    //

    Direct$Type$Buffer$RW$$BO$(DirectBuffer db,         // package-private

                               int mark, int pos, int lim, int cap,

                               int off)

    {

#if[rw]

        super(mark, pos, lim, cap);

        address = db.address() + off;

#if[byte]

        cleaner = null;

#end[byte]

#else[rw]

        super(db, mark, pos, lim, cap, off);

        this.isReadOnly = true;

#end[rw]

    }

    @Override

    Object base() {

        return null;

    }

    public $Type$Buffer slice() {

        int pos = this.position();

        int lim = this.limit();

        assert (pos <= lim);

        int rem = (pos <= lim ? lim - pos : 0);

        int off = (pos << $LG_BYTES_PER_VALUE$);

        assert (off >= 0);

        return new Direct$Type$Buffer$RW$$BO$(this, -1, 0, rem, rem, off);

    }

#if[byte]

    public $Type$Buffer slice(int pos, int lim) {

        assert (pos >= 0);

        assert (pos <= lim);

        int rem = lim - pos;

        return new Direct$Type$Buffer$RW$$BO$(this, -1, 0, rem, rem, pos);

    }

#end[byte]

    public $Type$Buffer duplicate() {

        return new Direct$Type$Buffer$RW$$BO$(this,

                                              this.markValue(),

                                              this.position(),

                                              this.limit(),

                                              this.capacity(),

                                              0);

    }

    public $Type$Buffer asReadOnlyBuffer() {

#if[rw]

        return new Direct$Type$BufferR$BO$(this,

                                           this.markValue(),

                                           this.position(),

                                           this.limit(),

                                           this.capacity(),

                                           0);

#else[rw]

        return duplicate();

#end[rw]

    }

#if[rw]

    public long address() {

        return address;

    }

    private long ix(int i) {

        return address + ((long)i << $LG_BYTES_PER_VALUE$);

    }

    public $type$ get() {

        try {

            return $fromBits$($swap$(UNSAFE.get$Swaptype$(ix(nextGetIndex()))));

        } finally {

            Reference.reachabilityFence(this);

        }

    }

    public $type$ get(int i) {

        try {

            return $fromBits$($swap$(UNSAFE.get$Swaptype$(ix(checkIndex(i)))));

        } finally {

            Reference.reachabilityFence(this);

        }

    }

#if[streamableType]

    $type$ getUnchecked(int i) {

        try {

            return $fromBits$($swap$(UNSAFE.get$Swaptype$(ix(i))));

        } finally {

            Reference.reachabilityFence(this);

        }

    }

#end[streamableType]

    public $Type$Buffer get($type$[] dst, int offset, int length) {

#if[rw]

        if (((long)length << $LG_BYTES_PER_VALUE$) > Bits.JNI_COPY_TO_ARRAY_THRESHOLD) {

            checkBounds(offset, length, dst.length);

            int pos = position();

            int lim = limit();

            assert (pos <= lim);

            int rem = (pos <= lim ? lim - pos : 0);

            if (length > rem)

                throw new BufferUnderflowException();

            long dstOffset = ARRAY_BASE_OFFSET + ((long)offset << $LG_BYTES_PER_VALUE$);

            try {

#if[!byte]

                if (order() != ByteOrder.nativeOrder())

                    UNSAFE.copySwapMemory(null,

                                          ix(pos),

                                          dst,

                                          dstOffset,

                                          (long)length << $LG_BYTES_PER_VALUE$,

                                          (long)1 << $LG_BYTES_PER_VALUE$);

                else

#end[!byte]

                    UNSAFE.copyMemory(null,

                                      ix(pos),

                                      dst,

                                      dstOffset,

                                      (long)length << $LG_BYTES_PER_VALUE$);

            } finally {

                Reference.reachabilityFence(this);

            }

            position(pos + length);

        } else {

            super.get(dst, offset, length);

        }

        return this;

#else[rw]

        throw new ReadOnlyBufferException();

#end[rw]

    }

#end[rw]

    public $Type$Buffer put($type$ x) {

#if[rw]

        try {

            UNSAFE.put$Swaptype$(ix(nextPutIndex()), $swap$($toBits$(x)));

        } finally {

            Reference.reachabilityFence(this);

        }

        return this;

#else[rw]

        throw new ReadOnlyBufferException();

#end[rw]

    }

    public $Type$Buffer put(int i, $type$ x) {

#if[rw]

        try {

            UNSAFE.put$Swaptype$(ix(checkIndex(i)), $swap$($toBits$(x)));

        } finally {

            Reference.reachabilityFence(this);

        }

        return this;

#else[rw]

        throw new ReadOnlyBufferException();

#end[rw]

    }

    public $Type$Buffer put($Type$Buffer src) {

#if[rw]

        if (src instanceof Direct$Type$Buffer$BO$) {

            if (src == this)

                throw createSameBufferException();

            Direct$Type$Buffer$RW$$BO$ sb = (Direct$Type$Buffer$RW$$BO$)src;

            int spos = sb.position();

            int slim = sb.limit();

            assert (spos <= slim);

            int srem = (spos <= slim ? slim - spos : 0);

            int pos = position();

            int lim = limit();

            assert (pos <= lim);

            int rem = (pos <= lim ? lim - pos : 0);

            if (srem > rem)

                throw new BufferOverflowException();

            try {

                UNSAFE.copyMemory(sb.ix(spos), ix(pos), (long)srem << $LG_BYTES_PER_VALUE$);

            } finally {

                Reference.reachabilityFence(sb);

                Reference.reachabilityFence(this);

            }

            sb.position(spos + srem);

            position(pos + srem);

        } else if (src.hb != null) {

            int spos = src.position();

            int slim = src.limit();

            assert (spos <= slim);

            int srem = (spos <= slim ? slim - spos : 0);

            put(src.hb, src.offset + spos, srem);

            src.position(spos + srem);

        } else {

            super.put(src);

        }

        return this;

#else[rw]

        throw new ReadOnlyBufferException();

#end[rw]

    }

    public $Type$Buffer put($type$[] src, int offset, int length) {

#if[rw]

        if (((long)length << $LG_BYTES_PER_VALUE$) > Bits.JNI_COPY_FROM_ARRAY_THRESHOLD) {

            checkBounds(offset, length, src.length);

            int pos = position();

            int lim = limit();

            assert (pos <= lim);

            int rem = (pos <= lim ? lim - pos : 0);

            if (length > rem)

                throw new BufferOverflowException();

            long srcOffset = ARRAY_BASE_OFFSET + ((long)offset << $LG_BYTES_PER_VALUE$);

            try {

#if[!byte]

                if (order() != ByteOrder.nativeOrder())

                    UNSAFE.copySwapMemory(src,

                                          srcOffset,

                                          null,

                                          ix(pos),

                                          (long)length << $LG_BYTES_PER_VALUE$,

                                          (long)1 << $LG_BYTES_PER_VALUE$);

                else

#end[!byte]

                    UNSAFE.copyMemory(src,

                                      srcOffset,

                                      null,

                                      ix(pos),

                                      (long)length << $LG_BYTES_PER_VALUE$);

            } finally {

                Reference.reachabilityFence(this);

            }

            position(pos + length);

        } else {

            super.put(src, offset, length);

        }

        return this;

#else[rw]

        throw new ReadOnlyBufferException();

#end[rw]

    }

    public $Type$Buffer compact() {

#if[rw]

        int pos = position();

        int lim = limit();

        assert (pos <= lim);

        int rem = (pos <= lim ? lim - pos : 0);

        try {

            UNSAFE.copyMemory(ix(pos), ix(0), (long)rem << $LG_BYTES_PER_VALUE$);

        } finally {

            Reference.reachabilityFence(this);

        }

        position(rem);

        limit(capacity());

        discardMark();

        return this;

#else[rw]

        throw new ReadOnlyBufferException();

#end[rw]

    }

    public boolean isDirect() {

        return true;

    }

    public boolean isReadOnly() {

        return {#if[rw]?false:true};

    }

#if[char]

    public String toString(int start, int end) {

        if ((end > limit()) || (start > end))

            throw new IndexOutOfBoundsException();

        try {

            int len = end - start;

            char[] ca = new char[len];

            CharBuffer cb = CharBuffer.wrap(ca);

            CharBuffer db = this.duplicate();

            db.position(start);

            db.limit(end);

            cb.put(db);

            return new String(ca);

        } catch (StringIndexOutOfBoundsException x) {

            throw new IndexOutOfBoundsException();

        }

    }

    // --- Methods to support CharSequence ---

    public CharBuffer subSequence(int start, int end) {

        int pos = position();

        int lim = limit();

        assert (pos <= lim);

        pos = (pos <= lim ? pos : lim);

        int len = lim - pos;

        if ((start < 0) || (end > len) || (start > end))

            throw new IndexOutOfBoundsException();

        return new DirectCharBuffer$RW$$BO$(this,

                                            -1,

                                            pos + start,

                                            pos + end,

                                            capacity(),

                                            offset);

    }