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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/nio/DoubleBufferImpl.java | |
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Diffstat (limited to 'libjava/classpath/java/nio/DoubleBufferImpl.java')
-rw-r--r-- | libjava/classpath/java/nio/DoubleBufferImpl.java | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/libjava/classpath/java/nio/DoubleBufferImpl.java b/libjava/classpath/java/nio/DoubleBufferImpl.java new file mode 100644 index 000000000..160841353 --- /dev/null +++ b/libjava/classpath/java/nio/DoubleBufferImpl.java @@ -0,0 +1,173 @@ +/* DoubleBufferImpl.java -- + Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.nio; + +/** + * This is a Heap memory implementation + */ +final class DoubleBufferImpl extends DoubleBuffer +{ + private final boolean readOnly; + + DoubleBufferImpl (int capacity) + { + this (new double [capacity], 0, capacity, capacity, 0, -1, false); + } + + DoubleBufferImpl (double[] buffer, int offset, int capacity, int limit, + int position, int mark, boolean readOnly) + { + super (capacity, limit, position, mark, null, buffer, offset); + this.readOnly = readOnly; + } + + public boolean isReadOnly () + { + return readOnly; + } + + public DoubleBuffer slice () + { + return new DoubleBufferImpl (backing_buffer, array_offset + position (), + remaining (), remaining (), 0, -1, isReadOnly ()); + } + + public DoubleBuffer duplicate () + { + return new DoubleBufferImpl (backing_buffer, array_offset, capacity (), + limit (), position (), mark, isReadOnly ()); + } + + public DoubleBuffer asReadOnlyBuffer () + { + return new DoubleBufferImpl (backing_buffer, array_offset, capacity (), + limit (), position (), mark, true); + } + + public DoubleBuffer compact () + { + checkIfReadOnly(); + mark = -1; + int p = position(); + int n = limit() - p; + if (n > 0) + { + System.arraycopy(backing_buffer, array_offset + p, + backing_buffer, array_offset, n); + } + position(n); + limit(capacity()); + return this; + } + + public boolean isDirect () + { + return false; + } + + /** + * Reads the <code>double</code> at this buffer's current position, + * and then increments the position. + * + * @exception BufferUnderflowException If there are no remaining + * <code>double</code>s in this buffer. + */ + public double get () + { + checkForUnderflow(); + + double result = backing_buffer [position ()]; + position (position () + 1); + return result; + } + + /** + * Relative put method. Writes <code>value</code> to the next position + * in the buffer. + * + * @exception BufferOverflowException If there no remaining + * space in this buffer. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public DoubleBuffer put (double value) + { + checkIfReadOnly(); + checkForOverflow(); + + backing_buffer [position ()] = value; + position (position () + 1); + return this; + } + + /** + * Absolute get method. Reads the <code>double</code> at position + * <code>index</code>. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit. + */ + public double get (int index) + { + checkIndex(index); + + return backing_buffer [index]; + } + + /** + * Absolute put method. Writes <code>value</code> to position + * <code>index</code> in the buffer. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public DoubleBuffer put (int index, double value) + { + checkIfReadOnly(); + checkIndex(index); + + backing_buffer [index] = value; + return this; + } + + public ByteOrder order () + { + return ByteOrder.nativeOrder (); + } +} |