/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.access.net;

import ch.qos.logback.access.PatternLayout;
import ch.qos.logback.access.spi.AccessEvent;
import ch.qos.logback.core.Layout;
import ch.qos.logback.core.boolex.EventEvaluator;
import ch.qos.logback.core.helpers.CyclicBuffer;
import ch.qos.logback.core.net.SMTPAppenderBase;

/**
 * Send an e-mail when a specific access event occurs, typically when
 * certain pages are accessed.
 * 
 * For more information about this appender, please refer to the online manual at
 * http://logback.qos.ch/manual/appenders.html#AccessSMTPAppender
 * <p>
 * @author Ceki G&uuml;lc&uuml;
 * @author S&eacute;bastien Pennec
 * 
 */
public class SMTPAppender extends SMTPAppenderBase<AccessEvent> {

  static final String DEFAULT_SUBJECT_PATTERN = "%m";

  /**
   * The default constructor will instantiate the appender with a
   * {@link EventEvaluator} that will trigger on events with level
   * ERROR or higher.
   */
  public SMTPAppender() {
  }

  /**
   * Use <code>evaluator</code> passed as parameter as the {@link
   * EventEvaluator} for this SMTPAppender.
   */
  public SMTPAppender(EventEvaluator<AccessEvent> evaluator) {
    this.eventEvaluator = evaluator;
  }

  /**
   * Perform SMTPAppender specific appending actions, mainly adding the event to
   * the appropriate cyclic buffer.
   */
  protected void subAppend(CyclicBuffer<AccessEvent> cb, AccessEvent event) {
    cb.add(event);
  }

  @Override
  protected void fillBuffer(CyclicBuffer<AccessEvent> cb, StringBuffer sbuf) {
    int len = cb.length();
    for (int i = 0; i < len; i++) {
      // sbuf.append(MimeUtility.encodeText(layout.format(cb.get())));
      AccessEvent event = (AccessEvent) cb.get();
      sbuf.append(layout.doLayout(event));
    }
  }

  @Override
  protected Layout<AccessEvent> makeSubjectLayout(String subjectStr) {
    if(subjectStr == null) {
      subjectStr = DEFAULT_SUBJECT_PATTERN;
    }
    PatternLayout pl = new PatternLayout();
    pl.setPattern(subjectStr);
    pl.start();
    return pl;
  }
}
