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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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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.awt.geom.Rectangle2D;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;

public class Context {
    private static final Pattern DOUBLE_PATTERN = Pattern.compile(
        "[\\x00-\\x20]*[+-]?(NaN|Infinity|((((\\p{Digit}+)(\\.)?((\\p{Digit}+)?)" +
        "([eE][+-]?(\\p{Digit}+))?)|(\\.(\\p{Digit}+)([eE][+-]?(\\p{Digit}+))?)|" +
        "(((0[xX](\\p{XDigit}+)(\\.)?)|(0[xX](\\p{XDigit}+)?(\\.)(\\p{XDigit}+)))" +
        "[pP][+-]?(\\p{Digit}+)))[fFdD]?))[\\x00-\\x20]*");

    private final Map _ctx = new HashMap<>();
    private final IAdjustableShape _props;
    private final Rectangle2D _anchor;
    
    public Context(CustomGeometry geom, Rectangle2D anchor, IAdjustableShape props){
        _props = props;
        _anchor = anchor;
        for(Guide gd : geom.adjusts) {
            evaluate(gd);
        }
        for(Guide gd : geom.guides) {
            evaluate(gd);
        }
    }

    Rectangle2D getShapeAnchor(){
        return _anchor;
    }

    Guide getAdjustValue(String name){
        return _props.getAdjustValue(name);
    }

    public double getValue(String key){
        if(DOUBLE_PATTERN.matcher(key).matches()){
            return Double.parseDouble(key);
        }

        // BuiltInGuide throws IllegalArgumentException if key is not defined
        return _ctx.containsKey(key) ? _ctx.get(key) : evaluate(BuiltInGuide.valueOf("_"+key));
    }

    public double evaluate(Formula fmla){
        double result = fmla.evaluate(this);
        if (fmla instanceof Guide) {
            String key = ((Guide)fmla).getName();
            if (key != null) {
                _ctx.put(key, result);
            }
        }
        return result;
    }
}