Quadcap Embeddable Database

com/quadcap/util/ConfigNumber.java

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package com.quadcap.util;

/* Copyright 1999 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.util.List;

/**
 * This class represents a configuration value which is a number 
 *
 * @author Stan Bailes
 */
public class ConfigNumber extends MutableInteger implements ConfigVar {
    String                              name;
    String                              stringVal;

    public ConfigNumber() {}

    public final void init(String name, String val)
        throws NumberFormatException
    {
        this.name = name;
        this.notify(val);
    }
    
    public final String getName() {
        return name;
    }

    public final String getValue() {
        return stringVal;
    }

    public final void notify(String newValue) {
        if (newValue.indexOf(',') >= 0 || newValue.indexOf('-') >= 0) {
            setIntValue(parseBitList(newValue));
        } else {
            setIntValue(Integer.parseInt(newValue));
        }
        this.stringVal = newValue;      
    }

    public int parseBitList(String str) {
        List list = Util.split(str, ',');
        int ret = 0;
        
        for (int i = 0; i < list.size(); i++) {
            int first, last;
            final String t = list.get(i).toString();
            final int idx = t.indexOf('-');
            if (idx > 0) {
                first = Integer.parseInt(t.substring(0, idx));
                last = Integer.parseInt(t.substring(idx+1));
                if (last < first) last = first;
            } else {
                try {
                    first = last = Integer.parseInt(t);
                } catch (Throwable ex) {
                    first = 1;
                    last = 0;
                }
            }
            for (int test = first; test <= last; test++) {
                ret += (1 << test);
            }
        }
        return ret;
    }
    
    private static final Class configClass = new ConfigNumber().getClass();
    
    public static ConfigNumber find(String name, String dflt) {
        ConfigNumber ret = (ConfigNumber)Config.find(configClass, name, dflt);
        return ret;
    }
}