package de.fhdw.wtf.persistence.utils;
   
   import java.io.File;
   import java.io.FileInputStream;
   import java.io.IOException;
   import java.util.Enumeration;
   import java.util.HashMap;
   import java.util.MissingResourceException;
   import java.util.Properties;
  
  /**
   * This PropertiesReader tries to read properties from a file in a given directory. The content of the file should be
   * seperated by "key1=value1".
   * 
   * @author HFW413hy
   *
   */
  public class PropertiesReaderFile implements PropertiesReader {
  	
  	/**
  	 * Stores the internal key-value-pairs.
  	 */
  	private final HashMap<String, String> propValues = new HashMap<>();
  	
  	@Override
  	public String getProperty(final String key) {
  		if (!this.propValues.containsKey(key)) {
  			return "";
  		}
  		return this.propValues.get(key);
  	}
  	
  	@Override
  	public void initialize(final String propFile) throws MissingResourceException {
  		final File f = new File(propFile);
  		if (!f.exists()) {
  			throw new MissingResourceException("", "", "");
  		}
  		
  		final Properties props = new Properties();
  		try (final FileInputStream inputStream = new FileInputStream(new File(propFile))) {
  			props.load(inputStream);
  		} catch (final IOException e) {
  			throw new MissingResourceException("", "", "");
  		}
  		
  		final Enumeration<Object> keys = props.keys();
  		while (keys.hasMoreElements()) {
  			final String key = (String) keys.nextElement();
  			final String value = props.getProperty(key);
  			this.propValues.put(key, value);
  		}
  	}
  }