f1b62339fa
* java/net/DatagramSocket.java (connect): Fixed comment. * java/nio/ByteBuffer.java (hasArray): Fixed comment. From-SVN: r64487
620 lines
17 KiB
Java
620 lines
17 KiB
Java
/* ByteBuffer.java --
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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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 implements Comparable
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{
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private ByteOrder endian = ByteOrder.BIG_ENDIAN;
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int offset;
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byte[] backing_buffer;
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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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{
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throw new Error ("direct buffers are not implemented");
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}
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/**
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* Allocates a new byte buffer.
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*/
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public static ByteBuffer allocate (int capacity)
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{
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return new ByteBufferImpl (capacity, 0, capacity);
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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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* @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);
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}
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ByteBuffer (int capacity, int limit, int position, int mark)
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{
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super (capacity, limit, position, mark);
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}
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/**
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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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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++)
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{
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dst [i] = get();
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}
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return this;
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}
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/**
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* This method transfers bytes from this buffer into the given
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* destination array.
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*
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* @param dst The byte array to write into.
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*
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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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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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public ByteBuffer put (ByteBuffer src)
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{
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if (src == this)
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throw new IllegalArgumentException ();
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while (src.hasRemaining ())
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put (src.get ());
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return this;
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}
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/**
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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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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++)
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put (src [i]);
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return this;
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}
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/**
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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);
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}
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/**
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* Tells whether or not this buffer is backed by an accessible array.
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*/
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public final boolean hasArray ()
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{
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return (backing_buffer != null
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&& !isReadOnly ());
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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 ()
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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;
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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 ()
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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 offset;
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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()
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{
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// FIXME: Check what SUN calcs here
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return super.hashCode();
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}
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/**
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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 != null &&
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obj instanceof ByteBuffer)
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{
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return compareTo (obj) == 0;
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}
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return false;
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}
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/**
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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) obj;
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if (a.remaining() != remaining())
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{
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return 1;
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}
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if (! hasArray() ||
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! a.hasArray())
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{
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return 1;
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}
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int r = remaining();
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int i1 = position ();
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int i2 = a.position ();
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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));
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if (t != 0)
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{
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return (int) t;
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}
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}
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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()
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{
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return endian;
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}
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/**
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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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this.endian = endian;
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return this;
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}
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/**
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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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/**
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* Relative put method.
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*
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* @exception BufferOverflowException If this buffer's current position is
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* not smaller than its limit.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public abstract ByteBuffer put (byte b);
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/**
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* Absolute get method.
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*
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* @exception IndexOutOfBoundsException FIXME
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*/
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public abstract byte get (int index);
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/**
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* Absolute put method.
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*
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* @exception ReadOnlyBufferException If this buffer is read-only
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* @exception IndexOutOfBoundsException FIXME
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*/
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public abstract ByteBuffer put (int index, byte b);
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/**
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* Compacts this buffer.
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*
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* @exception ReadOnlyBufferException If this buffer is read-only
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*/
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public abstract ByteBuffer compact();
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/**
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* Tells whether or not this buffer is direct.
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*/
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public abstract boolean isDirect();
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/**
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* Creates a new byte buffer whose content is a shared subsequence of this
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* buffer's content.
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*/
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public abstract ByteBuffer slice();
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/**
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* Creates a new byte buffer that shares this buffer's content.
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*/
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public abstract ByteBuffer duplicate();
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/**
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* Creates a new, read-only byte buffer that shares this buffer's content.
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*/
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public abstract ByteBuffer asReadOnlyBuffer();
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/**
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* Creates a view of this byte buffer as a short buffer.
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*/
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public abstract ShortBuffer asShortBuffer();
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/**
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* Creates a view of this byte buffer as a char buffer.
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*/
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public abstract CharBuffer asCharBuffer();
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/**
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* Creates a view of this byte buffer as an integer buffer.
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*/
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public abstract IntBuffer asIntBuffer();
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/**
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* Creates a view of this byte buffer as a long buffer.
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*/
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public abstract LongBuffer asLongBuffer();
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/**
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* Creates a view of this byte buffer as a float buffer.
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*/
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public abstract FloatBuffer asFloatBuffer();
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/**
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* Creates a view of this byte buffer as a double buffer.
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*/
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public abstract DoubleBuffer asDoubleBuffer();
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/**
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* Relative get method for reading a character value.
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*
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* @exception BufferUnderflowException If there are fewer than two bytes
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* remaining in this buffer.
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*/
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public abstract char getChar();
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/**
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* Relative put method for writing a character value.
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*
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* @exception BufferOverflowException If this buffer's current position is
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* not smaller than its limit.
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*/
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public abstract ByteBuffer putChar(char value);
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/**
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* Absolute get method for reading a character value.
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*
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* @exception IndexOutOfBoundsException If there are fewer than two bytes
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* remaining in this buffer
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*/
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public abstract char getChar(int index);
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/**
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* Absolute put method for writing a character value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus one.
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*/
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public abstract ByteBuffer putChar(int index, char value);
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/**
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* Relative get method for reading a short value.
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*
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* @exception BufferUnderflowException If index is negative or not smaller
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* than the buffer's limit, minus one.
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*/
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public abstract short getShort();
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/**
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* Relative put method for writing a short value.
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*
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* @exception BufferOverflowException If this buffer's current position is
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* not smaller than its limit.
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*/
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public abstract ByteBuffer putShort(short value);
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/**
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* Absolute get method for reading a short value.
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*
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* @exception IndexOutOfBoundsException If there are fewer than two bytes
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* remaining in this buffer
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*/
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public abstract short getShort(int index);
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/**
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* Absolute put method for writing a short value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus one.
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*/
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public abstract ByteBuffer putShort(int index, short value);
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/**
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* Relative get method for reading an integer value.
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*
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* @exception BufferUnderflowException If there are fewer than four bytes
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* remaining in this buffer.
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*/
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public abstract int getInt();
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/**
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* Relative put method for writing an integer value.
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*
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* @exception BufferOverflowException If this buffer's current position is
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* not smaller than its limit.
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*/
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public abstract ByteBuffer putInt(int value);
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/**
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* Absolute get method for reading an integer value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus three.
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*/
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public abstract int getInt(int index);
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/**
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* Absolute put method for writing an integer value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus three.
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*/
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public abstract ByteBuffer putInt(int index, int value);
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/**
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* Relative get method for reading a long value.
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*
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* @exception BufferUnderflowException If there are fewer than eight bytes
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* remaining in this buffer.
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*/
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public abstract long getLong();
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/**
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* Relative put method for writing a long value.
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*
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* @exception BufferOverflowException If this buffer's current position is
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* not smaller than its limit.
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*/
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public abstract ByteBuffer putLong(long value);
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/**
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* Absolute get method for reading a long value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus seven.
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*/
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public abstract long getLong(int index);
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/**
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* Absolute put method for writing a float value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus seven.
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*/
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public abstract ByteBuffer putLong(int index, long value);
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/**
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* Relative get method for reading a float value.
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*
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* @exception BufferUnderflowException If there are fewer than four bytes
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* remaining in this buffer.
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*/
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public abstract float getFloat();
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/**
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* Relative put method for writing a float value.
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*
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* @exception BufferOverflowException If there are fewer than four bytes
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* remaining in this buffer.
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*/
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public abstract ByteBuffer putFloat(float value);
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/**
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* Absolute get method for reading a float value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus three.
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*/
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public abstract float getFloat(int index);
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/**
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* Relative put method for writing a float value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus three.
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*/
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public abstract ByteBuffer putFloat(int index, float value);
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/**
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* Relative get method for reading a double value.
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*
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* @exception BufferUnderflowException If there are fewer than eight bytes
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* remaining in this buffer.
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*/
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public abstract double getDouble();
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/**
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* Relative put method for writing a double value.
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*
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* @exception BufferOverflowException If this buffer's current position is
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* not smaller than its limit.
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*/
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public abstract ByteBuffer putDouble(double value);
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/**
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* Absolute get method for reading a double value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus seven.
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*/
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public abstract double getDouble(int index);
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/**
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* Absolute put method for writing a double value.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit, minus seven.
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*/
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public abstract ByteBuffer putDouble(int index, double value);
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/**
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* Returns a string summarizing the state of this buffer.
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*/
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public String toString ()
|
|
{
|
|
return getClass ().getName () +
|
|
"[pos=" + position () +
|
|
" lim=" + limit () +
|
|
" cap=" + capacity () + "]";
|
|
}
|
|
}
|