/*
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is the Kowari Metadata Store.
 *
 * The Initial Developer of the Original Code is Plugged In Software Pty
 * Ltd (http://www.pisoftware.com, mailto:info@pisoftware.com). Portions
 * created by Plugged In Software Pty Ltd are Copyright (C) 2001,2002
 * Plugged In Software Pty Ltd. All Rights Reserved.
 *
 * Contributor(s): N/A.
 *
 * [NOTE: The text of this Exhibit A may differ slightly from the text
 * of the notices in the Source Code files of the Original Code. You
 * should use the text of this Exhibit A rather than the text found in the
 * Original Code Source Code for Your Modifications.]
 *
 */

package org.mulgara.content.mbox.parser.model.impl;

import org.apache.log4j.*;

import org.mulgara.content.Content;
import org.mulgara.content.mbox.parser.model.*;
import org.mulgara.content.mbox.parser.model.exception.*;

/**
 * Implementation of the mbox manager interface.  It will create and keep track
 * of mbox objects using an ArrayList as the cache.
 *
 * @created 2004-08-25
 *
 * @author Mark Ludlow
 *
 * @version $Revision: 1.7 $
 *
 * @modified $Date: 2005/01/05 04:57:43 $ @maintenanceAuthor $Author: newmana $
 *
 * @company <a href="mailto:info@PIsoftware.com">Plugged In Software</a>
 *
 * @copyright © 2004 <a href="http://www.PIsoftware.com/">Plugged In
 *      Software Pty Ltd</a>
 *
 * @licence <a href="{@docRoot}/../../LICENCE">Mozilla Public License v1.1</a>
 */
public class MBoxManagerImpl implements MBoxManager {

  /** Logger */
  private static final Logger logger = Logger.getLogger(MBoxManagerImpl.class);

  /** The current mbox we are dealing with */
  private MBox currentMBox;

  public MBoxManagerImpl() {
  }

  /**
   * Clears the cache of all stored mboxes.
   */
  public void clear() {
  }

  /**
   * Removes the given mbox from the cache.
   *
   * @param mbox The mbox to remove
   */
  public void delete(MBox mbox) throws ModelException {
  }

  /**
   * Gets the mbox associated with the given stream.  If the mbox exists already
   * then the mbox will be retrieved, else a new mbox will be created and set
   * up.
   *
   * @param contentStream The mbox stream we are creating an mbox for
   * @param uri The URI of the source file
   *
   * @return The mbox representing the stream
   *
   * @throws ModelException
   */
  public MBox getMBox(Content content) throws ModelException {

    if (currentMBox != null) {

      // If we have an existing current mbox, check if we are using the same one
      // by URI
      if (currentMBox.getURI().compareTo(content.getURI()) == 0) {

        if (logger.isDebugEnabled()) {

          logger.debug("Parsing already current mbox again: " + content.getURI() +
                       " (currently " + currentMBox.getURI() + ")");
        }

        // If we are using the same mbox as the currently used one then we
        // don't have to do anything
        return currentMBox;
      }
    }

    // Container for our model factory
    ModelFactory factory = null;

    try {

      // Attempt to get a factory instance
      factory = ModelFactory.getInstance();
    } catch (FactoryException factoryException) {

      throw new ModelException(
          "Unable to initialise the factory for creating a " +
          "new mbox.", factoryException);
    }

    // Create an array of the types for the mbox constructor
    Class<?> [] parameterTypes = new Class [] {Content.class};

    // Create an array of parameters for the mbox constructor
    Object [] parameters = new Object [] {content};


    try {

      // Create a new mbox for the content
      currentMBox = factory.createMBox(parameterTypes, parameters);
    } catch (FactoryException factoryException) {

      throw new ModelException("Unable to create a new mbox.", factoryException);
    }

    return currentMBox;
  }
}