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Apache POI - Java API To Access Microsoft Format Files

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/*
 *  ====================================================================
 *    Licensed to the Apache Software Foundation (ASF) under one or more
 *    contributor license agreements.  See the NOTICE file distributed with
 *    this work for additional information regarding copyright ownership.
 *    The ASF licenses this file to You under the Apache License, Version 2.0
 *    (the "License"); you may not use this file except in compliance with
 *    the License.  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 * ====================================================================
 */

package org.apache.poi.sl.draw.geom;

import java.util.regex.Matcher;

/**
 * Pin To Formula:
 * 
 *
 * 
 *     Usage: "pin x y z" = if (y < x), then x = value of this guide
 *     else if (y > z), then z = value of this guide
 *     else y = value of this guide
 * 
 *
 * @author Yegor Kozlov
 */
public class PinExpression implements Expression {
    private String arg1, arg2, arg3;

    PinExpression(Matcher m){
        arg1 = m.group(1);
        arg2 = m.group(2);
        arg3 = m.group(3);
    }

   public double evaluate(Context ctx){
        double x = ctx.getValue(arg1);
        double y = ctx.getValue(arg2);
        double z = ctx.getValue(arg3);
        if(y < x) return x;
        else if (y > z) return z;
        else return y;
    }

}