| /* |
| * Copyright (c) 2000, 2013, 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 ByteBufferAsCharBuffer extends CharBuffer { // package-private |
| |
| protected final ByteBuffer bb; |
| protected final int offset; |
| private final ByteOrder order; |
| |
| ByteBufferAsCharBuffer(ByteBuffer bb, |
| int mark, int pos, int lim, int cap, |
| int off, ByteOrder order) { |
| super(mark, pos, lim, cap); |
| this.bb = bb.duplicate(); |
| this.isReadOnly = bb.isReadOnly; |
| // There are only two possibilities for the type of ByteBuffer "bb", viz, DirectByteBuffer and |
| // HeapByteBuffer. We only have to initialize the field when bb is an instance of |
| // DirectByteBuffer. |
| // The address field is used by NIOAccess#getBasePointer and GetDirectBufferAddress method |
| // in art which return the address of the first usable byte of the underlying memory, i.e, |
| // the position of parent buffer. Therefore, value of "off" will be equal to parent buffer's |
| // position when the method is called from either HeapByteBuffer or DirectByteBuffer. |
| if (bb instanceof DirectByteBuffer) { |
| this.address = bb.address + off; |
| } |
| this.bb.order(order); |
| this.order = order; |
| offset = off; |
| } |
| |
| public CharBuffer slice() { |
| int pos = this.position(); |
| int lim = this.limit(); |
| assert (pos <= lim); |
| int rem = (pos <= lim ? lim - pos : 0); |
| int off = (pos << 1) + offset; |
| assert (off >= 0); |
| return new ByteBufferAsCharBuffer(bb, -1, 0, rem, rem, off, order); |
| } |
| |
| public CharBuffer duplicate() { |
| return new ByteBufferAsCharBuffer(bb, |
| markValue(), |
| position(), |
| limit(), |
| capacity(), |
| offset, |
| order); |
| } |
| |
| public CharBuffer asReadOnlyBuffer() { |
| return new ByteBufferAsCharBuffer(bb.asReadOnlyBuffer(), |
| markValue(), |
| position(), |
| limit(), |
| capacity(), |
| offset, |
| order); |
| } |
| |
| protected int ix(int i) { |
| return (i << 1) + offset; |
| } |
| |
| public char get() { |
| return get(nextGetIndex()); |
| } |
| |
| public char get(int i) { |
| return bb.getCharUnchecked(ix(checkIndex(i))); |
| } |
| |
| public CharBuffer get(char[] dst, int offset, int length) { |
| checkBounds(offset, length, dst.length); |
| if (length > remaining()) |
| throw new BufferUnderflowException(); |
| bb.getUnchecked(ix(position), dst, offset, length); |
| position += length; |
| return this; |
| } |
| |
| char getUnchecked(int i) { |
| return bb.getCharUnchecked(ix(i)); |
| } |
| |
| public CharBuffer put(char x) { |
| put(nextPutIndex(), x); |
| return this; |
| } |
| |
| public CharBuffer put(int i, char x) { |
| if (isReadOnly) { |
| throw new ReadOnlyBufferException(); |
| } |
| bb.putCharUnchecked(ix(checkIndex(i)), x); |
| return this; |
| } |
| |
| public CharBuffer put(char[] src, int offset, int length) { |
| checkBounds(offset, length, src.length); |
| if (length > remaining()) |
| throw new BufferOverflowException(); |
| bb.putUnchecked(ix(position), src, offset, length); |
| position += length; |
| return this; |
| } |
| |
| public CharBuffer 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 << 1); |
| } else { |
| Memory.memmove(this, ix(0), this, ix(pos), rem << 1); |
| } |
| position(rem); |
| limit(capacity()); |
| discardMark(); |
| return this; |
| } |
| |
| public boolean isDirect() { |
| return bb.isDirect(); |
| } |
| |
| public boolean isReadOnly() { |
| return isReadOnly; |
| } |
| |
| 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 ByteBufferAsCharBuffer(bb, |
| -1, |
| pos + start, |
| pos + end, |
| capacity(), |
| offset, |
| order); |
| } |
| |
| public ByteOrder order() { |
| return order; |
| } |
| } |