source: vanHelsing/trunk/gui/src/de/dass_it/vanhelsing/gui/PropertyBundle.java@ 865

package de.dass_it.vanhelsing.gui;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Locale;
import java.util.ResourceBundle;
import javax.faces.context.FacesContext;
/**
 * Class containing the methods used to access the messages property bundle
 * @author tgoecke
 *
 */
public class PropertyBundle{
        
        private static ResourceBundle properties;
        private static final String path = "de.dass_it.vanhelsing.gui.messages";
        /**
         * reads the messages property file
         */
        private static void initialize(){
                Locale l = FacesContext.getCurrentInstance().getViewRoot().getLocale();
                
                if (l == null){
                        l = Locale.ENGLISH;
                }
                properties = ResourceBundle.getBundle(path, l);
        }
        /**
         * method returns a single value of a given key
         * @param key   key of 
         * @return      value of the property identified by key. If an exception is thrown, null will be returned
         */
        public static String getProperty(String key){
                try{
                        if (properties == null){
                                initialize();
                        }
                        key = key.toLowerCase();
                        return properties.getString(key);
                } catch (Exception e) {
                        System.err.println(key+" / "+e.toString());
                }
                return null;
        }
        /**
         * method to retrieve properties with a partial key. a partial key is the first n characters of a key
         * 
         * @param partialKey    first n characters of a property key
         * @return      an array of values whose keys started with partialKey. an empty array is returned if no matchings have been found 
         */
        public static String[] getTypeProperties(String partialKey){
                Enumeration<String> keySet = properties.getKeys();
                String key;
                int i = 0;
                ArrayList<String> result = new ArrayList<String>();
                
                while(keySet.hasMoreElements()){
                        key = keySet.nextElement();
                        if (key.startsWith(partialKey)){
                                result.add(getProperty(key));
                        }
                }
                result.trimToSize();
                if (result.size()>0) return (String[]) result.toArray();
                return result.toArray(new String[0]);
        }
}