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From craft...@apache.org
Subject cvs commit: jakarta-avalon-excalibur/logger/src/java/org/apache/avalon/excalibur/logger/factory SMTPTargetFactory.java
Date Thu, 23 May 2002 19:42:56 GMT
crafterm    02/05/23 12:42:55

  Added:       logger/src/java/org/apache/avalon/excalibur/logger/factory
                        SMTPTargetFactory.java
  Log:
  Initial revision of a SMTPTargetFactory to create SMTPOutputLogTargets.
  
  Revision  Changes    Path
  1.1                  jakarta-avalon-excalibur/logger/src/java/org/apache/avalon/excalibur/logger/factory/SMTPTargetFactory.java
  
  Index: SMTPTargetFactory.java
  ===================================================================
  /*
   * Copyright (C) The Apache Software Foundation. All rights reserved.
   *
   * This software is published under the terms of the Apache Software License
   * version 1.1, a copy of which has been included  with this distribution in
   * the LICENSE.txt file.
   */
  package org.apache.avalon.excalibur.logger.factory;
  
  import javax.mail.Session;
  import javax.mail.Address;
  import javax.mail.internet.AddressException;
  import javax.mail.internet.InternetAddress;
  
  import org.apache.avalon.framework.configuration.Configuration;
  import org.apache.avalon.framework.configuration.ConfigurationException;
  import org.apache.avalon.framework.context.ContextException;
  import org.apache.log.LogTarget;
  import org.apache.log.format.Formatter;
  import org.apache.log.output.net.SMTPOutputLogTarget;
  
  /**
   * SMTPTargetFactory class.
   *
   * <p>
   * This factory creates SMTPOutputLogTarget's. It uses the
   * context-key attribute to locate the required JavaMail Session from
   * the Context object passed to this factory.  The default context-key
   * is <code>session-context</code>.
   * </p>
   *
   * <p>
   * <pre>
   * &lt;smtp id="target-id" context-key="context-key-to-session-object"&gt;
   *   &lt;format type="raw|pattern|extended"&gt;pattern to be used if needed&lt;/format&gt;
   *   &lt;to&gt;address-1@host&lt;/to&gt;
   *   &lt;to&gt;address-N@host&lt;/to&gt;
   *   &lt;from&gt;address@host&lt;/from&gt;
   *   &lt;subject&gt;subject line&lt;/subject&gt;
   *   &lt;maximum-size&gt;number&lt;/maximum-size&gt;
   * &lt;/smtp&gt;
   * </pre>
   *
   * <dl>
   *  <dt>&lt;format&gt;</dt>
   *  <dd>
   *   The type attribute of the pattern element denotes the type of
   *   Formatter to be used and according to it the pattern to use for.
   *   This elements defaults to:
   *   <p>
   *    %7.7{priority} %5.5{time}   [%8.8{category}] (%{context}): %{message}\\n%{throwable}
   *   </p>
   *  </dd>
   * </dl>
   * <p>
   *
   * @author <a href="mailto:crafterm@apache.org">Marcus Crafter</a>
   * @version CVS $Revision: 1.1 $ $Date: 2002/05/23 19:42:55 $
   * @since 4.1
   */
  public class SMTPTargetFactory
      extends AbstractTargetFactory
  {
      /**
       * Creates an SMTPOutputLogTarget based on a Configuration
       *
       * @param configuration a <code>Configuration</code> instance
       * @return <code>LogTarget</code> instance
       * @exception ConfigurationException if an error occurs
       */
      public final LogTarget createTarget( final Configuration config )
          throws ConfigurationException
      {
          if( m_context == null )
          {
              throw new ConfigurationException( "Context not available" );
          }
  
          try
          {
              return new SMTPOutputLogTarget(
                  getSession(),
                  getToAddresses( config ),
                  getFromAddress( config ),
                  getSubject( config ),
                  getMaxSize( config ),
                  getFormatter( config )
              );
          }
          catch( final ContextException ce )
          {
              throw new ConfigurationException( "Cannot find Session object in " +
                                                "application context", ce );
          }
          catch( final AddressException ae )
          {
              throw new ConfigurationException( "Cannot create address", ae );
          }
      }
  
      /**
       * Helper method to obtain a formatter for this factory.
       *
       * @param config a <code>Configuration</code> instance
       * @return a <code>Formatter</code> instance
       */
      protected Formatter getFormatter( final Configuration config )
      {
          final Configuration confFormat = config.getChild( "format" );
  
          if( null != confFormat )
          {
              final FormatterFactory formatterFactory = new FormatterFactory();
              return formatterFactory.createFormatter( confFormat );
          }
  
          return null;
      }
  
      /**
       * Helper method to obtain the JavaMail <code>Session</code> object
       * from this factories context object. Override this method if you
       * need to obtain the JavaMail session using some other way.
       *
       * @return JavaMail <code>Session</code> instance
       * @exception ContextException if an error occurs
       */
      protected Session getSession()
          throws ContextException
      {
          final String contextkey =
              m_configuration.getAttribute( "context-key", "session-context" );
          return (Session) m_context.get( contextkey );
      }
  
      /**
       * Helper method to obtain the subject line to use from the given
       * configuration object.
       *
       * @param config a <code>Configuration</code> instance
       * @return subject line
       */
      private String getSubject( Configuration config )
          throws ConfigurationException
      {
          return config.getChild( "subject" ).getValue();
      }
  
      /**
       * Helper method to obtain the maximum size any particular SMTP
       * message can be from a given configuration object.
       *
       * @param config a <code>Configuration</code> instance
       * @return maximum SMTP mail size
       */
      private int getMaxSize( Configuration config )
          throws ConfigurationException
      {
          return config.getChild( "maximum-size" ).getValueAsInteger();
      }
  
      /**
       * Helper method to obtain the <i>to</i> address/es from the 
       * given configuration.
       *
       * @param config <code>Configuration</code> instance
       * @return an array of <code>Address</code> objects
       * @exception ConfigurationException if a configuration error occurs
       * @exception AddressException if a addressing error occurs
       */
      private Address[] getToAddresses( final Configuration config )
          throws ConfigurationException, AddressException
      {
          final Configuration[] toAddresses = config.getChildren( "to" );
          final Address[] addresses = new Address[toAddresses.length];
  
          for (int i = 0; i < toAddresses.length; ++i)
          {
              addresses[i] = createAddress( toAddresses[i].getValue() );
          }
  
          return addresses;
      }
  
      /**
       * Helper method to obtain the <i>from</i> address from
       * the given configuration.
       *
       * @param config a <code>Configuration</code> instance
       * @return an <code>Address</code> object
       * @exception ConfigurationException if a configuration error occurs
       * @exception AddressException if a addressing error occurs
       */
      private Address getFromAddress( final Configuration config )
          throws ConfigurationException, AddressException
      {
          return createAddress( config.getChild( "from" ).getValue() );
      }
  
      /**
       * Helper factory method to create a new <code>Address</code>
       * object. Override this method in a subclass if you wish to
       * create other Address types rather than
       * <code>InternetAddress</code> (eg. <code>NewsAddress</code>)
       *
       * @param address address string from configuration
       * @return an <code>Address</code> object
       * @exception AddressException if an error occurs
       */
      protected Address createAddress( final String address )
          throws AddressException
      {
          return new InternetAddress( address );
      }
  }
  
  
  

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