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package java.nio; |
package java.nio; |
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import gnu.java.nio.ByteBufferImpl; |
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/** |
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* @since 1.4 |
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*/ |
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public abstract class ByteBuffer extends Buffer |
public abstract class ByteBuffer extends Buffer |
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{ |
{ |
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private ByteOrder endian = ByteOrder.BIG_ENDIAN; |
private ByteOrder endian = ByteOrder.BIG_ENDIAN; |
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/** |
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* Allocates a new direct byte buffer. |
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*/ |
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public static ByteBuffer allocateDirect (int capacity) |
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protected byte [] backing_buffer; |
protected byte [] backing_buffer; |
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public static ByteBuffer allocateDirect(int capacity) |
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{ |
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ByteBuffer b = new gnu.java.nio. ByteBufferImpl(capacity, 0, capacity); |
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return b; |
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} |
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public static ByteBuffer allocate(int capacity) |
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{ |
{ |
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ByteBuffer b = new gnu.java.nio. ByteBufferImpl(capacity, 0, capacity); |
ByteBuffer b = new gnu.java.nio. ByteBufferImpl(capacity, 0, capacity); |
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return b; |
return b; |
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} |
} |
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final public static ByteBuffer wrap(byte[] array, int offset, int length) |
/** |
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{ |
* Allocates a new byte buffer. |
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gnu.java.nio.ByteBufferImpl b = new gnu.java.nio. ByteBufferImpl(array, offset, length); |
*/ |
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return b; |
public static ByteBuffer allocate (int capacity) |
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} |
{ |
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return new ByteBufferImpl (capacity, 0, capacity); |
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final public static ByteBuffer wrap(String a) |
} |
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{ |
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return wrap(a.getBytes(), 0, a.length()); |
/** |
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} |
* Wraps a byte array into a buffer. |
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* |
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final public static ByteBuffer wrap(byte[] array) |
* @exception IndexOutOfBoundsException If the preconditions on the offset |
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* and length parameters do not hold |
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*/ |
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final public static ByteBuffer wrap (byte[] array, int offset, int length) |
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{ |
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return new ByteBufferImpl (array, offset, length); |
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} |
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/** |
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* Wraps a byte array into a buffer. |
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*/ |
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final public static ByteBuffer wrap (byte[] array) |
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{ |
{ |
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return wrap(array, 0, array.length); |
return wrap (array, 0, array.length); |
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} |
} |
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final public ByteBuffer get(byte[] dst, int offset, int length) |
/** |
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{ |
* This method transfers bytes from this buffer into |
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* the given destination array. |
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* |
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* @param dst The destination array |
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* @param offset The offset within the array of the first byte to be written; |
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* must be non-negative and no larger than dst.length. |
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* @param length The maximum number of bytes to be written to the given array; |
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* must be non-negative and no larger than dst.length - offset. |
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* |
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* @exception BufferUnderflowException If there are fewer than length bytes |
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* remaining in this buffer. |
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* @exception IndexOutOfBoundsException - If the preconditions on the offset |
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* and length parameters do not hold. |
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*/ |
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final public ByteBuffer get (byte[] dst, int offset, int length) |
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{ |
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if ((offset < 0) || |
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(offset > dst.length) || |
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(length < 0) || |
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(length > (dst.length - offset))) |
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throw new IndexOutOfBoundsException (); |
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for (int i = offset; i < offset + length; i++) |
for (int i = offset; i < offset + length; i++) |
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{ |
{ |
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dst[i] = get(); |
dst [i] = get(); |
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} |
} |
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return this; |
return this; |
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} |
} |
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final public ByteBuffer get(byte[] dst) |
/** |
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{ |
* This method transfers bytes from this buffer into the given |
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return get(dst, 0, dst.length); |
* destination array. |
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} |
* |
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* @param dst The byte array to write into. |
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final public ByteBuffer put(ByteBuffer src) |
* |
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* @exception BufferUnderflowException If there are fewer than dst.length |
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* bytes remaining in this buffer. |
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*/ |
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final public ByteBuffer get (byte[] dst) |
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{ |
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return get (dst, 0, dst.length); |
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} |
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/** |
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* Writes the content of src into the buffer. |
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* |
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* @param src The source data. |
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* |
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* @exception BufferOverflowException If there is insufficient space in this |
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* buffer for the remaining bytes in the source buffer. |
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* @exception IllegalArgumentException If the source buffer is this buffer. |
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* @exception ReadOnlyBufferException If this buffer is read only. |
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*/ |
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final public ByteBuffer put (ByteBuffer src) |
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{ |
{ |
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while (src.hasRemaining()) |
if (src == this) |
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put(src.get()); |
throw new IllegalArgumentException (); |
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while (src.hasRemaining ()) |
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{ |
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put (src.get ()); |
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} |
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return this; |
return this; |
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} |
} |
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final public ByteBuffer put(byte[] src, int offset, int length) |
/** |
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{ |
* Writes the content of the the array src into the buffer. |
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* |
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* @param src The array to copy into the buffer. |
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* @param offset The offset within the array of the first byte to be read; |
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* must be non-negative and no larger than src.length. |
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* @param length The number of bytes to be read from the given array; |
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* must be non-negative and no larger than src.length - offset. |
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* |
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* @exception BufferOverflowException If there is insufficient space in this |
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* buffer for the remaining bytes in the source buffer. |
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* @exception IndexOutOfBoundsException If the preconditions on the offset |
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* and length parameters do not hold. |
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* @exception ReadOnlyBufferException If this buffer is read only. |
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*/ |
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final public ByteBuffer put (byte[] src, int offset, int length) |
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{ |
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if ((offset < 0) || |
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(offset > src.length) || |
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(length < 0) || |
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(length > src.length - offset)) |
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throw new IndexOutOfBoundsException (); |
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for (int i = offset; i < offset + length; i++) |
for (int i = offset; i < offset + length; i++) |
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put(src[i]); |
{ |
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put (src [i]); |
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} |
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return this; |
return this; |
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} |
} |
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public final ByteBuffer put(byte[] src) |
/** |
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* Writes the content of the the array src into the buffer. |
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* |
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* @param src The array to copy into the buffer. |
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* |
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* @exception BufferOverflowException If there is insufficient space in this |
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* buffer for the remaining bytes in the source buffer. |
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* @exception ReadOnlyBufferException If this buffer is read only. |
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*/ |
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public final ByteBuffer put (byte[] src) |
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{ |
{ |
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return put(src, 0, src.length); |
return put (src, 0, src.length); |
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} |
} |
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/** |
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* Tells whether or not this buffer is backed by an accessible byte array. |
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*/ |
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public final boolean hasArray() |
public final boolean hasArray() |
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{ |
{ |
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return (backing_buffer != null); |
return (backing_buffer != null); |
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} |
} |
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/** |
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* Returns the byte array that backs this buffer. |
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* |
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* @exception ReadOnlyBufferException If this buffer is backed by an array |
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* but is read-only. |
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* @exception UnsupportedOperationException If this buffer is not backed |
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* by an accessible array. |
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*/ |
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public final byte[] array() |
public final byte[] array() |
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{ |
{ |
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if (backing_buffer == null) |
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throw new UnsupportedOperationException (); |
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if (isReadOnly ()) |
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throw new ReadOnlyBufferException (); |
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return backing_buffer; |
return backing_buffer; |
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} |
} |
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/** |
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* Returns the offset within this buffer's backing array of the first element |
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* of the buffer |
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* |
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* @exception ReadOnlyBufferException If this buffer is backed by an array |
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* but is read-only. |
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* @exception UnsupportedOperationException If this buffer is not backed |
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* by an accessible array. |
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*/ |
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public final int arrayOffset() |
public final int arrayOffset() |
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{ |
{ |
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if (backing_buffer == null) |
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throw new UnsupportedOperationException (); |
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if (isReadOnly ()) |
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throw new ReadOnlyBufferException (); |
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// FIXME: Return correct value |
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return 0; |
return 0; |
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} |
} |
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/** |
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* Returns the current hash code of this buffer. |
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*/ |
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public int hashCode() |
public int hashCode() |
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{ |
{ |
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// FIXME: Check what SUN calcs here |
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return super.hashCode(); |
return super.hashCode(); |
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} |
} |
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public boolean equals(Object obj) |
/** |
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* Tells whether or not this buffer is equal to another object. |
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*/ |
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public boolean equals (Object obj) |
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{ |
{ |
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if (obj instanceof ByteBuffer) |
if (obj != null && |
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obj instanceof ByteBuffer) |
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{ |
{ |
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return compareTo(obj) == 0; |
return compareTo (obj) == 0; |
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} |
} |
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return false; |
return false; |
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} |
} |
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public int compareTo(Object ob) |
/** |
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* Compares this buffer to another object. |
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* |
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* @exception ClassCastException If the argument is not a byte buffer |
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*/ |
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public int compareTo (Object obj) |
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{ |
{ |
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ByteBuffer a = (ByteBuffer) ob; |
ByteBuffer a = (ByteBuffer) obj; |
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if (a.remaining() != remaining()) |
if (a.remaining() != remaining()) |
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return 1; |
{ |
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return 1; |
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} |
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if (! hasArray() || |
if (! hasArray() || |
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! a.hasArray()) |
! a.hasArray()) |
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{ |
{ |
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return 1; |
return 1; |
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} |
} |
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int r = remaining(); |
int r = remaining(); |
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int i1 = pos; |
int i1 = position (); |
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int i2 = a.pos; |
int i2 = a.position (); |
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for (int i=0;i<r;i++) |
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for (int i = 0; i < r; i++) |
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{ |
{ |
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int t = (int) (get(i1)- a.get(i2)); |
int t = (int) (get (i1) - a.get (i2)); |
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if (t != 0) |
if (t != 0) |
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{ |
{ |
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return (int) t; |
return (int) t; |
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} |
} |
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} |
} |
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return 0; |
return 0; |
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} |
} |
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/** |
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* Retrieves this buffer's byte order. |
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*/ |
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public final ByteOrder order() |
public final ByteOrder order() |
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{ |
{ |
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return endian; |
return endian; |
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} |
} |
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public final ByteBuffer order(ByteOrder bo) |
/** |
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* Modifies this buffer's byte order. |
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*/ |
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public final ByteBuffer order (ByteOrder endian) |
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{ |
{ |
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endian = bo; |
this.endian = endian; |
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return this; |
return this; |
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} |
} |
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public abstract byte get(); |
/** |
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* Reads the byte at this buffer's current position, |
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* and then increments the position. |
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* |
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* @exception BufferUnderflowException If the buffer's current position |
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* is not smaller than its limit. |
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*/ |
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public abstract byte get (); |
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public abstract java.nio. ByteBuffer put(byte b); |
public abstract ByteBuffer put (byte b); |
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public abstract byte get(int index); |
public abstract byte get (int index); |
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public abstract java.nio. ByteBuffer put(int index, byte b); |
public abstract ByteBuffer put (int index, byte b); |
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public abstract ByteBuffer compact(); |
public abstract ByteBuffer compact(); |
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public abstract boolean isDirect(); |
public abstract boolean isDirect(); |
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public abstract ByteBuffer slice(); |
public abstract ByteBuffer slice(); |