JCONFIGURATIONMANAGER - GESTION DES CONFIGURATIONS

package jcm.JConfigurationManager;

import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.List;

import org.jdom.input.SAXBuilder;
import org.jdom.*;

public class JConfigurationManager
{
	/**
	 * Collection which contains configuration
	 */
	private static Hashtable<String,String> htConfiguration = new Hashtable<String,String>();
	
	/**
	 * Path where the configuration file is searched
	 */
	private static String filePath = "./META-INF/app.config.xml";
	
	@SuppressWarnings("unchecked")
	private static void loadConfiguration() throws Exception
	{
		SAXBuilder sxb = new SAXBuilder();
		org.jdom.Document document;
		Element root;
		String key;
		
		// build the document
	    document = sxb.build(new File(filePath));
	    
	    // get root elements
	    root = document.getRootElement();
	    	    
	    // for all childs whose name is section
	    for(Element e : (List<Element>)root.getChildren("section"))
	    {	    	
	    	// for all childs whose name is entry
	    	for(Element e2 : (List<Element>)e.getChildren("entry"))
	    	{
	    		// build the key
	    		key = String.format("%s.%s", e.getAttributeValue("name"), e2.getAttributeValue("key"));
	    		
	    		// check if the key already exists
	    		if(htConfiguration.containsKey(key))
	    		{
	    			throw new Exception(
	    					String.format("JConfigurationManager : La clé %s existe déja!",key));
	    		}
	    		
	    		htConfiguration.put(key, e2.getAttributeValue("value"));
	    	}
	    }
	}
		
	/**
	 * Initialize the configuration manager
	 * @throws Exception Throw an exception if the file doesn't exists or if the file doesn't can read
	 */
	public static void Initialize() throws Exception
	{
		File f = new File(filePath);
		
		// check that the file exists
		if(!f.exists())
		{
			throw new IOException("JConfigurationManager : Le fichier app.config.xml est introuvable!");
		}
		
		if(!f.canRead())
		{
			throw new IOException("JConfigurationManager : Impossible de lire le fichier app.config.xml!");			
		}
		
		// load the configuration
		loadConfiguration();
	}
	
	/**
	 * Initialize the configuration manager
	 * @param fileName Exception Throw an exception if the file doesn't exists or if the file doesn't can read
	 */
	public static void Initialize(String fileName) throws Exception
	{
		filePath = fileName;
		Initialize();
	}
	
	/**
	 * Get a value from the section name and key name
	 * @param sectionName Name of the section
	 * @param key Name of the key
	 * @return The corresponding value
	 */
	public static String getValue(String sectionName, String key)
	{
		return htConfiguration.get(String.format("%s.%s", sectionName,key));
	}
	
	/**
	 * Get a hash table from the section name
	 * @param sectionName Name of the section
	 * @return The corresponding hash table
	 */
	public static Hashtable<String,String> getValues(String sectionName)
	{
		Hashtable<String,String> values = new Hashtable<String,String>();
		String element;
		
		for (Enumeration<String> e = htConfiguration.keys() ; e.hasMoreElements() ;)
		{
			element = e.nextElement();
			
			// if the key contains the section name
			if(element.substring(0,element.indexOf(".")).equals(sectionName))
			{
				// add the element to the list
		         values.put(element, htConfiguration.get(element));
			}
		}
		
		return values;
	}
}