package de.fhdw.wtf.persistence.utils;
   
   import java.util.Enumeration;
   import java.util.HashMap;
   import java.util.MissingResourceException;
   import java.util.ResourceBundle;
   
   /**
    * This PropertiesReader tries to read properties from a ressource file in a given directory. The content of the
   * ressource file should be seperated by "key1=value1".
   * 
   * @author HFW413hy
   *
   */
  public class PropertiesReaderRessource implements PropertiesReader {
  	
  	/**
  	 * Stores the internal key-value-pairs.
  	 */
  	private final HashMap<String, String> propValues = new HashMap<>();
  	
  	/**
  	 * Deletes the internal instance. You should initialize it again with the method "getInstance(String propFile)".
  	 */
  	public void reset() {
  		this.propValues.clear();
  	}
  	
  	@Override
  	public void initialize(final String propFile) throws MissingResourceException {
  		this.reset();
  		final ResourceBundle rb = ResourceBundle.getBundle(propFile);
  		final Enumeration<String> keys = rb.getKeys();
  		while (keys.hasMoreElements()) {
  			final String key = keys.nextElement();
  			final String value = rb.getString(key);
  			this.propValues.put(key, value);
  		}
  	}
  	
  	@Override
  	public String getProperty(final String key) {
  		if (!this.propValues.containsKey(key)) {
  			return "";
  		}
  		return this.propValues.get(key);
  	}
  }