com.greenpepper.shaded.org.codehaus.commons.compiler.samples.ShippingCost Maven / Gradle / Ivy


/*
 * Janino - An embedded Java[TM] compiler
 *
 * Copyright (c) 2001-2010, Arno Unkrig
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
 *       following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 *       following disclaimer in the documentation and/or other materials provided with the distribution.
 *    3. The name of the author may not be used to endorse or promote products derived from this software without
 *       specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.greenpepper.shaded.org.codehaus.commons.compiler.samples;

import com.greenpepper.shaded.org.codehaus.commons.compiler.CompilerFactoryFactory;
import com.greenpepper.shaded.org.codehaus.commons.compiler.IExpressionEvaluator;

/**
 * Sample application which demonstrates how to use the
 * {@link com.greenpepper.shaded.org.codehaus.janino.ExpressionEvaluator ExpressionEvaluator} class.
 */
public final
class ShippingCost {

    private ShippingCost() {}

    /**/
    public static void
    main(String[] args) throws Exception {

        if (args.length != 1) {
            System.err.println("Usage: ");
            System.err.println("Computes the shipping costs from the double value \"total\".");
            System.err.println("If \"total\" is less than 100.0, then the result is 7.95, else the result is 0.");
            System.exit(1);
        }

        // Convert command line argument to call argument "total".
        Object[] arguments = new Object[] { new Double(args[0]) };

        // Create "ExpressionEvaluator" object.
        IExpressionEvaluator ee = CompilerFactoryFactory.getDefaultCompilerFactory().newExpressionEvaluator();
        ee.setExpressionType(double.class);
        ee.setParameters(new String[] { "total" }, new Class[] { double.class });
        ee.cook("total >= 100.0 ? 0.0 : 7.95");

        // Evaluate expression with actual parameter values.
        Object res = ee.evaluate(arguments);

        // Print expression result.
        System.out.println("Result = " + (res == null ? "(null)" : res.toString()));
    }
}