Subversion Repositories mkgmap

/*
 * Copyright (C) 2008 Steve Ratcliffe
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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.
 *
 *
 * Author: Steve Ratcliffe
 * Create date: May 17, 2008
 */
package uk.me.parabola.util;

import java.util.Enumeration;
import java.util.Properties;

/**
 * Wrapper that behaves as an enhanced properties class that has getProperty
 * calls for different data types.
 *
 * @author Steve Ratcliffe
 */
public class EnhancedProperties extends Properties {
       
        public EnhancedProperties() {
        }

        public EnhancedProperties(Properties defaults) {
                // We copy values, rather than making them default values so that
                // we can enumerate all the options.
                Enumeration<?> en = defaults.propertyNames();
                while (en.hasMoreElements()) {
                        String key = (String) en.nextElement();
                        setProperty(key, defaults.getProperty(key));
                }
        }

        /**
         * Get a property as an integer value.  If the property does not exist
         * or the value is not a valid integer, then the default value is returned
         * instead.
         * @param key The property name to retrieve.
         * @param def The Default value to use if the property does not exist or
         * if the value is not a valid integer.
         * @return The value of the property as an integer, or the default value.
         */
        public int getProperty(String key, int def) {
                try {
                        String s = getProperty(key);
                        return s == null ? def : Integer.parseInt(s);
                } catch (NumberFormatException e) {
                        return def;
                }
        }

        /**
         * Get a property as a boolean value.  If the value of the property
         * begins with a '1', a 'y' or a 't' (for 1, yes, true) then true is
         * returned.  If the property does not exist then the given default
         * value is returned.
         *
         * @param key The property name to get.
         * @param def The default value that is returned if property does not
         * exist.
         * @return The value of the property as a boolean.  If the property does
         * not exist then the value of 'def'.
         */
        public boolean getProperty(String key, boolean def) {
                String s = getProperty(key);
                if (s != null) {
                        if (s.length() == 0)
                                return true;
                        char c = s.toLowerCase().charAt(0);
                        if (c == '1' || c == 'y' || c == 't')
                                return true;
                        else
                                return false;
                }
                return def;
        }

        /**
         * Return a property as a double value.  If the property does not
         * exist or is not a valid double, then the given default value
         * is returned instead.
         * @param key The property name.
         * @param def The default value to return if no valid value.
         * @return The value of the property as a double.
         */
        public double getProperty(String key, double def) {
                try {
                        String s = getProperty(key);
                        return s == null ? def : Double.parseDouble(s);
                } catch (NumberFormatException e) {
                        return def;
                }
        }
}