/*
* 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 com.google.gwt.corp.compatibility.Endianness;
import com.google.gwt.corp.compatibility.Numbers;
import com.google.gwt.typedarrays.client.ArrayBufferNative;
import com.google.gwt.typedarrays.client.Int8ArrayNative;
import com.google.gwt.typedarrays.shared.ArrayBuffer;
import com.google.gwt.typedarrays.shared.ArrayBufferView;
import com.google.gwt.typedarrays.shared.Int8Array;
/** DirectByteBuffer, DirectReadWriteByteBuffer and DirectReadOnlyHeapByteBuffer compose the implementation of direct byte buffers.
* <p>
* DirectByteBuffer implements all the shared readonly methods and is extended by the other two classes.
* </p>
* <p>
* All methods are marked final for runtime performance.
* </p> */
abstract class DirectByteBuffer extends BaseByteBuffer implements HasArrayBufferView {
Int8Array byteArray;
DirectByteBuffer (int capacity) {
this(ArrayBufferNative.create(capacity), capacity, 0);
}
DirectByteBuffer (ArrayBuffer buf) {
this(buf, buf.byteLength(), 0);
}
DirectByteBuffer (ArrayBuffer buffer, int capacity, int offset) {
super(capacity);
byteArray = Int8ArrayNative.create(buffer, offset, capacity);
}
public ArrayBufferView getTypedArray () {
return byteArray;
}
public int getElementSize () {
return 1;
}
/*
* Override ByteBuffer.get(byte[], int, int) to improve performance.
*
* (non-Javadoc)
*
* @see java.nio.ByteBuffer#get(byte[], int, int)
*/
public final ByteBuffer get (byte[] dest, int off, int len) {
int length = dest.length;
if (off < 0 || len < 0 || (long)off + (long)len > length) {
throw new IndexOutOfBoundsException();
}
if (len > remaining()) {
throw new BufferUnderflowException();
}
for (int i = 0; i < len; i++) {
dest[i + off] = get(position + i);
}
position += len;
return this;
}
public final byte get () {
// if (position == limit) {
// throw new BufferUnderflowException();
// }
return (byte)byteArray.get(position++);
}
public final byte get (int index) {
// if (index < 0 || index >= limit) {
// throw new IndexOutOfBoundsException();
// }
return (byte)byteArray.get(index);
}
public final double getDouble () {
return Numbers.longBitsToDouble(getLong());
}
public final double getDouble (int index) {
return Numbers.longBitsToDouble(getLong(index));
}
public final float getFloat () {
return Numbers.intBitsToFloat(getInt());
}
public final float getFloat (int index) {
return Numbers.intBitsToFloat(getInt(index));
}
public final int getInt () {
int newPosition = position + 4;
// if (newPosition > limit) {
// throw new BufferUnderflowException();
// }
int result = loadInt(position);
position = newPosition;
return result;
}
public final int getInt (int index) {
// if (index < 0 || index + 4 > limit) {
// throw new IndexOutOfBoundsException();
// }
return loadInt(index);
}
public final long getLong () {
int newPosition = position + 8;
// if (newPosition > limit) {
// throw new BufferUnderflowException();
// }
long result = loadLong(position);
position = newPosition;
return result;
}
public final long getLong (int index) {
// if (index < 0 || index + 8 > limit) {
// throw new IndexOutOfBoundsException();
// }
return loadLong(index);
}
public final short getShort () {
int newPosition = position + 2;
// if (newPosition > limit) {
// throw new BufferUnderflowException();
// }
short result = loadShort(position);
position = newPosition;
return result;
}
public final short getShort (int index) {
// if (index < 0 || index + 2 > limit) {
// throw new IndexOutOfBoundsException();
// }
return loadShort(index);
}
public final boolean isDirect () {
return false;
}
protected final int loadInt (int baseOffset) {
int bytes = 0;
if (order == Endianness.BIG_ENDIAN) {
for (int i = 0; i < 4; i++) {
bytes = bytes << 8;
bytes = bytes | (byteArray.get(baseOffset + i) & 0xFF);
}
} else {
for (int i = 3; i >= 0; i--) {
bytes = bytes << 8;
bytes = bytes | (byteArray.get(baseOffset + i) & 0xFF);
}
}
return bytes;
}
protected final long loadLong (int baseOffset) {
long bytes = 0;
if (order == Endianness.BIG_ENDIAN) {
for (int i = 0; i < 8; i++) {
bytes = bytes << 8;
bytes = bytes | (byteArray.get(baseOffset + i) & 0xFF);
}
} else {
for (int i = 7; i >= 0; i--) {
bytes = bytes << 8;
bytes = bytes | (byteArray.get(baseOffset + i) & 0xFF);
}
}
return bytes;
}
protected final short loadShort (int baseOffset) {
short bytes = 0;
if (order == Endianness.BIG_ENDIAN) {
bytes = (short)(byteArray.get(baseOffset) << 8);
bytes |= (byteArray.get(baseOffset + 1) & 0xFF);
} else {
bytes = (short)(byteArray.get(baseOffset + 1) << 8);
bytes |= (byteArray.get(baseOffset) & 0xFF);
}
return bytes;
}
protected final void store (int baseOffset, int value) {
if (order == Endianness.BIG_ENDIAN) {
for (int i = 3; i >= 0; i--) {
byteArray.set(baseOffset + i, (byte)(value & 0xFF));
value = value >> 8;
}
} else {
for (int i = 0; i <= 3; i++) {
byteArray.set(baseOffset + i, (byte)(value & 0xFF));
value = value >> 8;
}
}
}
protected final void store (int baseOffset, long value) {
if (order == Endianness.BIG_ENDIAN) {
for (int i = 7; i >= 0; i--) {
byteArray.set(baseOffset + i, (byte)(value & 0xFF));
value = value >> 8;
}
} else {
for (int i = 0; i <= 7; i++) {
byteArray.set(baseOffset + i, (byte)(value & 0xFF));
value = value >> 8;
}
}
}
protected final void store (int baseOffset, short value) {
if (order == Endianness.BIG_ENDIAN) {
byteArray.set(baseOffset, (byte)((value >> 8) & 0xFF));
byteArray.set(baseOffset + 1, (byte)(value & 0xFF));
} else {
byteArray.set(baseOffset + 1, (byte)((value >> 8) & 0xFF));
byteArray.set(baseOffset, (byte)(value & 0xFF));
}
}
}