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

   1 /* gnu.classpath.tools.gjdoc.expr.AdditionExpression
   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 class AdditionExpression
  24    extends BinaryComputationExpression
  25 {
  26    public AdditionExpression(Expression left, Expression right)
  27    {
  28       super(left, right);
  29    }
  30
  31    protected double compute(double leftValue, double rightValue)
  32    {
  33       return leftValue + rightValue;
  34    }
  35
  36    protected float compute(float leftValue, float rightValue)
  37    {
  38       return leftValue + rightValue;
  39    }
  40
  41    protected long compute(long leftValue, long rightValue)
  42    {
  43       return leftValue + rightValue;
  44    }
  45
  46    protected int compute(int leftValue, int rightValue)
  47    {
  48       return leftValue + rightValue;
  49    }
  50
  51    public ConstantExpression evaluate(Context context)
  52       throws IllegalExpressionException
  53    {
  54       ConstantExpression leftValue = left.evaluate(context);
  55       ConstantExpression rightValue = right.evaluate(context);
  56
  57       if (Type.STRING == leftValue.getType()
  58           || Type.STRING == rightValue.getType()) {
  59
  60          return new ConstantString(leftValue.asObject().toString()
  61                                    + rightValue.asObject().toString());
  62       }
  63       else {
  64          return super.evaluate(leftValue, rightValue);
  65       }
  66
  67    }
  68
  69 }