AdditionExpression.java

/* gnu.classpath.tools.gjdoc.expr.AdditionExpression
   Copyright (C) 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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */

package gnu.classpath.tools.gjdoc.expr;

class AdditionExpression
   extends BinaryComputationExpression
{
   public AdditionExpression(Expression left, Expression right)
   {
      super(left, right);
   }

   protected double compute(double leftValue, double rightValue)
   {
      return leftValue + rightValue;
   }

   protected float compute(float leftValue, float rightValue)
   {
      return leftValue + rightValue;
   }

   protected long compute(long leftValue, long rightValue)
   {
      return leftValue + rightValue;
   }

   protected int compute(int leftValue, int rightValue)
   {
      return leftValue + rightValue;
   }

   public ConstantExpression evaluate(Context context)
      throws IllegalExpressionException
   {
      ConstantExpression leftValue = left.evaluate(context);
      ConstantExpression rightValue = right.evaluate(context);

      if (Type.STRING == leftValue.getType()
          || Type.STRING == rightValue.getType()) {
         
         return new ConstantString(leftValue.asObject().toString()
                                   + rightValue.asObject().toString());
      }
      else {
         return super.evaluate(leftValue, rightValue);
      }

   }

}