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387 lines
11 KiB
Java
387 lines
11 KiB
Java
/* LongBuffer.java --
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Copyright (C) 2002, 2003, 2004, 2005 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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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// GCJ LOCAL: Change gnu.classpath.Pointer to RawData
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import gnu.gcj.RawData;
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/**
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* @since 1.4
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*/
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public abstract class LongBuffer extends Buffer
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implements Comparable<LongBuffer>
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{
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final int array_offset;
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final long[] backing_buffer;
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LongBuffer (int capacity, int limit, int position, int mark,
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RawData address, long[] backing_buffer, int array_offset)
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{
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super (capacity, limit, position, mark, address);
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this.backing_buffer = backing_buffer;
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this.array_offset = array_offset;
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}
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/**
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* Allocates a new <code>LongBuffer</code> object with a given capacity.
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*/
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public static LongBuffer allocate (int capacity)
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{
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return new LongBufferImpl (capacity);
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}
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/**
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* Wraps a <code>long</code> array into a <code>LongBuffer</code>
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* object.
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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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public static final LongBuffer wrap (long[] array, int offset, int length)
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{
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return new LongBufferImpl (array, 0, array.length, offset + length, offset, -1, false);
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}
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/**
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* Wraps a <code>long</code> array into a <code>LongBuffer</code>
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* object.
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*/
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public static final LongBuffer wrap (long[] array)
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{
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return wrap (array, 0, array.length);
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}
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/**
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* This method transfers <code>long</code>s from this buffer into the given
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* destination array. Before the transfer, it checks if there are fewer than
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* length <code>long</code>s remaining in this buffer.
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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 <code>long</code>
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* to be written; 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
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* <code>long</code>s 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 LongBuffer get (long[] dst, int offset, int length)
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{
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checkArraySize(dst.length, offset, length);
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checkForUnderflow(length);
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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 <code>long</code>s 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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* <code>long</code>s remaining in this buffer.
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*/
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public LongBuffer get (long[] 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 the the <code>LongBUFFER</code> src
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* into the buffer. Before the transfer, it checks if there is fewer than
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* <code>src.remaining()</code> space remaining in this 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 <code>long</code>s 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 LongBuffer put (LongBuffer src)
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{
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if (src == this)
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throw new IllegalArgumentException ();
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checkForOverflow(src.remaining ());
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if (src.remaining () > 0)
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{
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long[] toPut = new long [src.remaining ()];
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src.get (toPut);
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put (toPut);
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}
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return this;
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}
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/**
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* Writes the content of the the <code>long array</code> src
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* into the buffer. Before the transfer, it checks if there is fewer than
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* length space remaining in this 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 <code>long</code>s in the source array.
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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 LongBuffer put (long[] src, int offset, int length)
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{
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checkArraySize(src.length, offset, length);
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checkForOverflow(length);
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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 <code>long array</code> src
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* 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 <code>long</code>s in the source array.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public final LongBuffer put (long[] 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 ot not this buffer is backed by an accessible
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* <code>long</code> 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 <code>long</code> array that backs this buffer.
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*
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* @exception ReadOnlyBufferException If this buffer 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 long[] array ()
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{
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if (backing_buffer == null)
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throw new UnsupportedOperationException ();
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checkIfReadOnly();
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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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*
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* @exception ReadOnlyBufferException If this buffer 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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checkIfReadOnly();
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return array_offset;
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}
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/**
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* Calculates a hash code for this buffer.
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*
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* This is done with <code>long</code> arithmetic,
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* where ** represents exponentiation, by this formula:<br>
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* <code>s[position()] + 31 + (s[position()+1] + 30)*31**1 + ... +
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* (s[limit()-1]+30)*31**(limit()-1)</code>.
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* Where s is the buffer data. Note that the hashcode is dependent
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* on buffer content, and therefore is not useful if the buffer
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* content may change.
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*
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* @return the hash code (casted to int)
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*/
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public int hashCode ()
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{
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long hashCode = get(position()) + 31;
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long multiplier = 1;
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for (int i = position() + 1; i < limit(); ++i)
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{
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multiplier *= 31;
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hashCode += (get(i) + 30)*multiplier;
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}
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return ((int)hashCode);
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}
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/**
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* Checks if this buffer is equal to obj.
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*/
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public boolean equals (Object obj)
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{
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if (obj instanceof LongBuffer)
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{
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return compareTo ((LongBuffer) 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 two <code>LongBuffer</code> objects.
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*
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* @exception ClassCastException If obj is not an object derived from
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* <code>LongBuffer</code>.
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*/
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public int compareTo (LongBuffer other)
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{
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int num = Math.min(remaining(), other.remaining());
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int pos_this = position();
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int pos_other = other.position();
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for (int count = 0; count < num; count++)
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{
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long a = get(pos_this++);
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long b = other.get(pos_other++);
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if (a == b)
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continue;
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if (a < b)
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return -1;
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return 1;
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}
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return remaining() - other.remaining();
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}
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/**
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* Returns the byte order of this buffer.
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*/
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public abstract ByteOrder order ();
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/**
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* Reads the <code>long</code> 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 there are no remaining
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* <code>long</code>s in this buffer.
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*/
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public abstract long get ();
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/**
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* Writes the <code>long</code> at this buffer's current position,
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* and then increments the position.
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*
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* @exception BufferOverflowException If there no remaining
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* <code>long</code>s in this buffer.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public abstract LongBuffer put (long b);
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/**
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* Absolute get method.
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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.
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*/
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public abstract long get (int index);
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/**
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* Absolute put method.
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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.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public abstract LongBuffer put (int index, long 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 LongBuffer compact ();
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/**
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* Tells wether 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 <code>LongBuffer</code> whose content is a shared
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* subsequence of this buffer's content.
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*/
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public abstract LongBuffer slice ();
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/**
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* Creates a new <code>LongBuffer</code> that shares this buffer's
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* content.
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*/
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public abstract LongBuffer duplicate ();
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/**
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* Creates a new read-only <code>LongBuffer</code> that shares this
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* buffer's content.
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*/
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public abstract LongBuffer asReadOnlyBuffer ();
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}
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