/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.nio;
import libcore.io.SizeOf;
abstract class DirectByteBuffer extends BaseByteBuffer {
// This is the offset into {@code Buffer.block} at which this buffer logically starts.
// TODO: rewrite this so we set 'block' to an OffsetMemoryBlock?
protected final int offset;
protected DirectByteBuffer(MemoryBlock block, int capacity, int offset) {
super(capacity, block);
long baseSize = block.getSize();
if (baseSize >= 0 && (capacity + offset) > baseSize) {
throw new IllegalArgumentException("capacity + offset > baseSize");
}
this.offset = offset;
this.effectiveDirectAddress = block.toInt() + offset;
}
@Override
public final ByteBuffer get(byte[] dst, int dstOffset, int byteCount) {
checkGetBounds(1, dst.length, dstOffset, byteCount);
this.block.peekByteArray(offset + position, dst, dstOffset, byteCount);
position += byteCount;
return this;
}
final void get(char[] dst, int dstOffset, int charCount) {
int byteCount = checkGetBounds(SizeOf.CHAR, dst.length, dstOffset, charCount);
this.block.peekCharArray(offset + position, dst, dstOffset, charCount, order.needsSwap);
position += byteCount;
}
final void get(double[] dst, int dstOffset, int doubleCount) {
int byteCount = checkGetBounds(SizeOf.DOUBLE, dst.length, dstOffset, doubleCount);
this.block.peekDoubleArray(offset + position, dst, dstOffset, doubleCount, order.needsSwap);
position += byteCount;
}
final void get(float[] dst, int dstOffset, int floatCount) {
int byteCount = checkGetBounds(SizeOf.FLOAT, dst.length, dstOffset, floatCount);
this.block.peekFloatArray(offset + position, dst, dstOffset, floatCount, order.needsSwap);
position += byteCount;
}
final void get(int[] dst, int dstOffset, int intCount) {
int byteCount = checkGetBounds(SizeOf.INT, dst.length, dstOffset, intCount);
this.block.peekIntArray(offset + position, dst, dstOffset, intCount, order.needsSwap);
position += byteCount;
}
final void get(long[] dst, int dstOffset, int longCount) {
int byteCount = checkGetBounds(SizeOf.LONG, dst.length, dstOffset, longCount);
this.block.peekLongArray(offset + position, dst, dstOffset, longCount, order.needsSwap);
position += byteCount;
}
final void get(short[] dst, int dstOffset, int shortCount) {
int byteCount = checkGetBounds(SizeOf.SHORT, dst.length, dstOffset, shortCount);
this.block.peekShortArray(offset + position, dst, dstOffset, shortCount, order.needsSwap);
position += byteCount;
}
@Override
public final byte get() {
if (position == limit) {
throw new BufferUnderflowException();
}
return this.block.peekByte(offset + position++);
}
@Override
public final byte get(int index) {
checkIndex(index);
return this.block.peekByte(offset + index);
}
@Override
public final char getChar() {
int newPosition = position + SizeOf.CHAR;
if (newPosition > limit) {
throw new BufferUnderflowException();
}
char result = (char) this.block.peekShort(offset + position, order);
position = newPosition;
return result;
}
@Override
public final char getChar(int index) {
checkIndex(index, SizeOf.CHAR);
return (char) this.block.peekShort(offset + index, order);
}
@Override
public final double getDouble() {
int newPosition = position + SizeOf.DOUBLE;
if (newPosition > limit) {
throw new BufferUnderflowException();
}
double result = Double.longBitsToDouble(this.block.peekLong(offset + position, order));
position = newPosition;
return result;
}
@Override
public final double getDouble(int index) {
checkIndex(index, SizeOf.DOUBLE);
return Double.longBitsToDouble(this.block.peekLong(offset + index, order));
}
@Override
public final float getFloat() {
int newPosition = position + SizeOf.FLOAT;
if (newPosition > limit) {
throw new BufferUnderflowException();
}
float result = Float.intBitsToFloat(this.block.peekInt(offset + position, order));
position = newPosition;
return result;
}
@Override
public final float getFloat(int index) {
checkIndex(index, SizeOf.FLOAT);
return Float.intBitsToFloat(this.block.peekInt(offset + index, order));
}
@Override
public final int getInt() {
int newPosition = position + SizeOf.INT;
if (newPosition > limit) {
throw new BufferUnderflowException();
}
int result = this.block.peekInt(offset + position, order);
position = newPosition;
return result;
}
@Override
public final int getInt(int index) {
checkIndex(index, SizeOf.INT);
return this.block.peekInt(offset + index, order);
}
@Override
public final long getLong() {
int newPosition = position + SizeOf.LONG;
if (newPosition > limit) {
throw new BufferUnderflowException();
}
long result = this.block.peekLong(offset + position, order);
position = newPosition;
return result;
}
@Override
public final long getLong(int index) {
checkIndex(index, SizeOf.LONG);
return this.block.peekLong(offset + index, order);
}
@Override
public final short getShort() {
int newPosition = position + SizeOf.SHORT;
if (newPosition > limit) {
throw new BufferUnderflowException();
}
short result = this.block.peekShort(offset + position, order);
position = newPosition;
return result;
}
@Override
public final short getShort(int index) {
checkIndex(index, SizeOf.SHORT);
return this.block.peekShort(offset + index, order);
}
@Override
public final boolean isDirect() {
return true;
}
public final void free() {
block.free();
}
@Override byte[] protectedArray() {
byte[] array = this.block.array();
if (array == null) {
throw new UnsupportedOperationException();
}
return array;
}
@Override int protectedArrayOffset() {
protectedArray(); // Throw if we don't have an array.
return offset;
}
@Override boolean protectedHasArray() {
return this.block.array() != null;
}
}