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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [gnu/] [java/] [awt/] [BitMaskExtent.java] - Blame information for rev 769

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1 769 jeremybenn
/* Copyright (C) 2000, 2002  Free Software Foundation
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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 gnu.java.awt;
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/**
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 * Simple transparent utility class that can be used to perform bit
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 * mask extent calculations.
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 */
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public final class BitMaskExtent
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{
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  /** The number of the least significant bit of the bit mask extent. */
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  public byte leastSignificantBit;
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  /** The number of bits in the bit mask extent. */
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  public byte bitWidth;
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  /**
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   * Set the bit mask. This will calculate and set the leastSignificantBit
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   * and bitWidth fields.
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   *
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   * @see #leastSignificantBit
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   * @see #bitWidth
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   */
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  public void setMask(long mask)
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  {
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    leastSignificantBit = 0;
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    bitWidth = 0;
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    if (mask == 0) return;
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    long shiftMask = mask;
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    for (; (shiftMask&1) == 0; shiftMask >>>=1) leastSignificantBit++;
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    for (; (shiftMask&1) != 0; shiftMask >>>=1) bitWidth++;
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    if (shiftMask != 0)
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      throw new IllegalArgumentException("mask must be continuous");
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  }
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  /**
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   * Calculate the bit mask based on the values of the
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   * leastSignificantBit and bitWidth fields.
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   */
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  public long toMask()
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  {
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    return ((1<<bitWidth)-1) << leastSignificantBit;
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  }
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}

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