package com.nilhcem.fakesmtp.log;
   
   import java.util.Observable;
   
   import ch.qos.logback.classic.spi.ILoggingEvent;
   import ch.qos.logback.core.AppenderBase;
   
   /**
    * Logback appender class, which will redirect all logs to the {@code LogsPane} object.
   *
   * @author Nilhcem
   * @since 1.0
   * @param <E> a Logback logging event.
   */
  public final class SMTPLogsAppender<E> extends AppenderBase<E> {
  	private SMTPLogsObservable observable = new SMTPLogsObservable();
  
  	/**
  	 * Receives a log from Logback, and sends it to the {@code LogsPane} object.
  	 *
  	 * @param event a Logback {@code ILoggingEvent} event.
  	 */
  	@Override
  	protected void append(E event) {
  		if (event instanceof ILoggingEvent) {
  			ILoggingEvent loggingEvent = (ILoggingEvent) event;
  			observable.notifyObservers(loggingEvent.getFormattedMessage());
  		}
  	}
  
  	/**
  	 * Returns the log observable object.
  	 *
  	 * @return the log observable object.
  	 */
  	public Observable getObservable() {
  		return observable;
  	}
  }