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This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

/*
 * IncreaseFunction.java - ++ operator
 * Copyright (C) 2000 Romain Guy
 * romain.guy@jext.org
 * http://www.jext.org
 *
 * This program 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 Increase 2
 * of the License, or any later Increase.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package org.jext.dawn.math;

import org.jext.dawn.*;

/**
 * Increases a numeric value (which can be in a variable) by one.
* Usage:
* number ++ or var ++. * @author Romain Guy */ public class IncreaseFunction extends Function { public IncreaseFunction() { super("++"); } public void invoke(DawnParser parser) throws DawnRuntimeException { if (parser.isTopNumeric()) parser.pushNumber(parser.popNumber() + 1); else { String var = parser.popString(); parser.checkVarName(this, var); Object obj = parser.getVariable(var); if (obj instanceof Double) { double value = ((Double) obj).doubleValue(); parser.setVariable(var, new Double(value + 1)); } else throw new DawnRuntimeException(this, parser, "variable " + var + " does not contains a numeric value"); } } } // End of IncreaseFunction.java
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