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/*
* 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;
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.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;
}
}