Initial revision

From-SVN: r102074

libjava/classpath/java/nio/FloatViewBufferImpl.java

@@ -0,0 +1,173 @@
+/* FloatViewBufferImpl.java -- 
+   Copyright (C) 2003, 2004 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;
+
+final class FloatViewBufferImpl extends FloatBuffer
+{
+  /** Position in bb (i.e. a byte offset) where this buffer starts. */
+  private int offset;
+  private ByteBuffer bb;
+  private boolean readOnly;
+  private ByteOrder endian;
+  
+  FloatViewBufferImpl (ByteBuffer bb, int capacity)
+  {
+    super (capacity, capacity, 0, -1);
+    this.bb = bb;
+    this.offset = bb.position();
+    this.readOnly = bb.isReadOnly();
+    this.endian = bb.order();
+    if (bb.isDirect())
+      this.address = VMDirectByteBuffer.adjustAddress(bb.address, offset);
+  }
+  
+  public FloatViewBufferImpl (ByteBuffer bb, int offset, int capacity,
+			      int limit, int position, int mark,
+			      boolean readOnly, ByteOrder endian)
+  {
+    super (capacity, limit, position, mark);
+    this.bb = bb;
+    this.offset = offset;
+    this.readOnly = readOnly;
+    this.endian = endian;
+    if (bb.isDirect())
+      this.address = VMDirectByteBuffer.adjustAddress(bb.address, offset);
+  }
+
+  /**
+   * Reads the <code>float</code> at this buffer's current position,
+   * and then increments the position.
+   *
+   * @exception BufferUnderflowException If there are no remaining
+   * <code>floats</code> in this buffer.
+   */
+  public float get ()
+  {
+    int p = position();
+    float result = ByteBufferHelper.getFloat(bb, (p << 2) + offset, endian);
+    position(p + 1);
+    return result;
+  }
+
+  /**
+   * Absolute get method. Reads the <code>float</code> at position
+   * <code>index</code>.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit.
+   */
+  public float get (int index)
+  {
+    return ByteBufferHelper.getFloat(bb, (index << 2) + offset, endian);
+  }
+
+  public FloatBuffer put (float value)
+  {
+    int p = position();
+    ByteBufferHelper.putFloat(bb, (p << 2) + offset, value, endian);
+    position(p + 1);
+    return this;
+  }
+  
+  public FloatBuffer put (int index, float value)
+  {
+    ByteBufferHelper.putFloat(bb, (index << 2) + offset, value, endian);
+    return this;
+  }
+
+  public FloatBuffer compact ()
+  {
+    if (position () > 0)
+      {
+        int count = limit () - position ();
+	bb.shiftDown(offset, offset + 4 * position(), 4 * count);
+        position (count);
+        limit (capacity ());
+      }
+    else
+      {
+	position(limit());
+	limit(capacity());
+      }
+    return this;
+  }
+  
+  public FloatBuffer slice ()
+  {
+    // Create a sliced copy of this object that shares its content.
+    return new FloatViewBufferImpl (bb, (position () >> 2) + offset,
+				    remaining(), remaining(), 0, -1,
+				    readOnly, endian);
+  }
+  
+  FloatBuffer duplicate (boolean readOnly)
+  {
+    int pos = position();
+    reset();
+    int mark = position();
+    position(pos);
+    return new FloatViewBufferImpl (bb, offset, capacity(), limit(),
+				    pos, mark, readOnly, endian);
+  }
+  
+  public FloatBuffer duplicate ()
+  {
+    return duplicate(readOnly);
+  }
+
+  public FloatBuffer asReadOnlyBuffer ()
+  {
+    return duplicate(true);
+  }
+
+  public boolean isReadOnly ()
+  {
+    return readOnly;
+  }
+  
+  public boolean isDirect ()
+  {
+    return bb.isDirect ();
+  }
+  
+  public ByteOrder order ()
+  {
+    return endian;
+  }
+}