libjava/classpath/tools/gnu/classpath/tools/gjdoc/expr/BinaryBitwiseExpression.java

   1 /* gnu.classpath.tools.gjdoc.expr.BinaryBitwiseExpression
   2    Copyright (C) 2004 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA. */
  20
  21 package gnu.classpath.tools.gjdoc.expr;
  22
  23 abstract class BinaryBitwiseExpression
  24    extends BinaryExpression
  25 {
  26    protected BinaryBitwiseExpression(Expression left, Expression right)
  27    {
  28       super(left, right);
  29    }
  30
  31    public ConstantExpression evaluate(Context context)
  32       throws IllegalExpressionException
  33    {
  34       ConstantExpression leftValue = left.evaluate(context);
  35       ConstantExpression rightValue = right.evaluate(context);
  36
  37       if (Type.LONG == leftValue.getType()
  38           || Type.LONG == rightValue.getType()) {
  39
  40          return new ConstantLong(compute(leftValue.asNumber().longValue(),
  41                                          rightValue.asNumber().longValue()));
  42       }
  43       else {
  44          return new ConstantInteger(compute(leftValue.asNumber().intValue(),
  45                                             rightValue.asNumber().intValue()));
  46       }
  47    }
  48
  49    protected abstract long compute(long leftValue, long rightValue);
  50    protected abstract int compute(int leftValue, int rightValue);
  51 }