DirectByteBufferImpl.java [plain text]
package java.nio;
import gnu.gcj.RawData;
abstract class DirectByteBufferImpl extends ByteBuffer
{
private final Object owner;
static final class ReadOnly extends DirectByteBufferImpl
{
ReadOnly(Object owner, RawData address,
int capacity, int limit,
int position)
{
super(owner, address, capacity, limit, position);
}
public ByteBuffer put(byte value)
{
throw new ReadOnlyBufferException ();
}
public ByteBuffer put(int index, byte value)
{
throw new ReadOnlyBufferException ();
}
public boolean isReadOnly()
{
return true;
}
}
static final class ReadWrite extends DirectByteBufferImpl
{
ReadWrite(int capacity)
{
super(capacity);
}
ReadWrite(RawData address, int capacity)
{
super(address, capacity);
}
ReadWrite(Object owner, RawData address,
int capacity, int limit,
int position)
{
super(owner, address, capacity, limit, position);
}
public boolean isReadOnly()
{
return false;
}
}
DirectByteBufferImpl(int capacity)
{
super(capacity, capacity, 0, -1);
this.owner = this;
this.address = VMDirectByteBuffer.allocate(capacity);
}
DirectByteBufferImpl(RawData address, int capacity)
{
super(capacity, capacity, 0, -1);
this.owner = null;
this.address = address;
}
DirectByteBufferImpl(Object owner, RawData address,
int capacity, int limit,
int position)
{
super(capacity, limit, position, -1);
this.owner = owner;
this.address = address;
}
public static ByteBuffer allocate(int capacity)
{
return new DirectByteBufferImpl.ReadWrite(capacity);
}
protected void finalize() throws Throwable
{
if (owner == this)
VMDirectByteBuffer.free(address);
}
public byte get()
{
checkForUnderflow();
int pos = position();
byte result = VMDirectByteBuffer.get(address, pos);
position(pos + 1);
return result;
}
public byte get(int index)
{
checkIndex(index);
return VMDirectByteBuffer.get(address, index);
}
public ByteBuffer get(byte[] dst, int offset, int length)
{
checkArraySize(dst.length, offset, length);
checkForUnderflow(length);
int index = position();
VMDirectByteBuffer.get(address, index, dst, offset, length);
position(index+length);
return this;
}
public ByteBuffer put(byte value)
{
checkForOverflow();
int pos = position();
VMDirectByteBuffer.put(address, pos, value);
position(pos + 1);
return this;
}
public ByteBuffer put(int index, byte value)
{
checkIndex(index);
VMDirectByteBuffer.put(address, index, value);
return this;
}
void shiftDown(int dst_offset, int src_offset, int count)
{
VMDirectByteBuffer.shiftDown(address, dst_offset, src_offset, count);
}
public ByteBuffer compact()
{
checkIfReadOnly();
mark = -1;
int pos = position();
if (pos > 0)
{
int count = remaining();
VMDirectByteBuffer.shiftDown(address, 0, pos, count);
position(count);
limit(capacity());
}
else
{
position(limit());
limit(capacity());
}
return this;
}
public ByteBuffer slice()
{
int rem = remaining();
if (isReadOnly())
return new DirectByteBufferImpl.ReadOnly
(owner, VMDirectByteBuffer.adjustAddress(address, position()),
rem, rem, 0);
else
return new DirectByteBufferImpl.ReadWrite
(owner, VMDirectByteBuffer.adjustAddress(address, position()),
rem, rem, 0);
}
private ByteBuffer duplicate(boolean readOnly)
{
int pos = position();
reset();
int mark = position();
position(pos);
DirectByteBufferImpl result;
if (readOnly)
result = new DirectByteBufferImpl.ReadOnly(owner, address, capacity(),
limit(), pos);
else
result = new DirectByteBufferImpl.ReadWrite(owner, address, capacity(),
limit(), pos);
if (mark != pos)
{
result.position(mark);
result.mark();
result.position(pos);
}
return result;
}
public ByteBuffer duplicate()
{
return duplicate(isReadOnly());
}
public ByteBuffer asReadOnlyBuffer()
{
return duplicate(true);
}
public boolean isDirect()
{
return true;
}
public CharBuffer asCharBuffer()
{
return new CharViewBufferImpl(this, remaining() >> 1);
}
public ShortBuffer asShortBuffer()
{
return new ShortViewBufferImpl(this, remaining() >> 1);
}
public IntBuffer asIntBuffer()
{
return new IntViewBufferImpl(this, remaining() >> 2);
}
public LongBuffer asLongBuffer()
{
return new LongViewBufferImpl(this, remaining() >> 3);
}
public FloatBuffer asFloatBuffer()
{
return new FloatViewBufferImpl(this, remaining() >> 2);
}
public DoubleBuffer asDoubleBuffer()
{
return new DoubleViewBufferImpl(this, remaining() >> 3);
}
public char getChar()
{
return ByteBufferHelper.getChar(this, order());
}
public ByteBuffer putChar(char value)
{
ByteBufferHelper.putChar(this, value, order());
return this;
}
public char getChar(int index)
{
return ByteBufferHelper.getChar(this, index, order());
}
public ByteBuffer putChar(int index, char value)
{
ByteBufferHelper.putChar(this, index, value, order());
return this;
}
public short getShort()
{
return ByteBufferHelper.getShort(this, order());
}
public ByteBuffer putShort(short value)
{
ByteBufferHelper.putShort(this, value, order());
return this;
}
public short getShort(int index)
{
return ByteBufferHelper.getShort(this, index, order());
}
public ByteBuffer putShort(int index, short value)
{
ByteBufferHelper.putShort(this, index, value, order());
return this;
}
public int getInt()
{
return ByteBufferHelper.getInt(this, order());
}
public ByteBuffer putInt(int value)
{
ByteBufferHelper.putInt(this, value, order());
return this;
}
public int getInt(int index)
{
return ByteBufferHelper.getInt(this, index, order());
}
public ByteBuffer putInt(int index, int value)
{
ByteBufferHelper.putInt(this, index, value, order());
return this;
}
public long getLong()
{
return ByteBufferHelper.getLong(this, order());
}
public ByteBuffer putLong(long value)
{
ByteBufferHelper.putLong(this, value, order());
return this;
}
public long getLong(int index)
{
return ByteBufferHelper.getLong(this, index, order());
}
public ByteBuffer putLong(int index, long value)
{
ByteBufferHelper.putLong(this, index, value, order());
return this;
}
public float getFloat()
{
return ByteBufferHelper.getFloat(this, order());
}
public ByteBuffer putFloat(float value)
{
ByteBufferHelper.putFloat(this, value, order());
return this;
}
public float getFloat(int index)
{
return ByteBufferHelper.getFloat(this, index, order());
}
public ByteBuffer putFloat(int index, float value)
{
ByteBufferHelper.putFloat(this, index, value, order());
return this;
}
public double getDouble()
{
return ByteBufferHelper.getDouble(this, order());
}
public ByteBuffer putDouble(double value)
{
ByteBufferHelper.putDouble(this, value, order());
return this;
}
public double getDouble(int index)
{
return ByteBufferHelper.getDouble(this, index, order());
}
public ByteBuffer putDouble(int index, double value)
{
ByteBufferHelper.putDouble(this, index, value, order());
return this;
}
}