/**
    * This file Copyright (c) 2011-2015 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.cms.core.version;
  
  import info.magnolia.jcr.wrapper.NodeWrappingDelegateSessionWrapper;
  
  import java.io.IOException;
  import java.io.OutputStream;
  
  import javax.jcr.Item;
  import javax.jcr.Node;
  import javax.jcr.PathNotFoundException;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  import org.apache.jackrabbit.commons.xml.DocumentViewExporter;
  import org.apache.jackrabbit.commons.xml.Exporter;
  import org.apache.jackrabbit.commons.xml.SystemViewExporter;
  import org.apache.jackrabbit.commons.xml.ToXmlContentHandler;
  import org.xml.sax.ContentHandler;
  import org.xml.sax.SAXException;
  
  /**
   * Session wrapper enabling Magnolia specific way of handling versioning on all child nodes. Wrapper will also ensure that version information are not exposed via export.
   */
  public class MgnlVersioningSession extends NodeWrappingDelegateSessionWrapper {
  
      public MgnlVersioningSession(Session wrapped) {
          super(wrapped);
      }
  
      @Override
      protected Node wrapNode(Node node) {
          return new MgnlVersioningNodeWrapper(node);
      }
  
      @Override
      public void exportSystemView(String absPath, ContentHandler contentHandler, boolean skipBinary, boolean noRecurse) throws PathNotFoundException, SAXException, RepositoryException {
          // customize exporter for root path to skip jcr:system
          if ("/".equals(absPath)) {
              export(absPath, new SystemViewExporter(getWrappedSession(), contentHandler, !noRecurse, !skipBinary) {
  
                  @Override
                  protected void exportNode(String uri, String local, Node node) throws RepositoryException, SAXException {
                      if ("jcr:system".equals(node.getName())) {
                          // skip version history
                          return;
                      }
                      super.exportNode(uri, local, node);
                  }
              });
          } else {
              getWrappedSession().exportSystemView(absPath, contentHandler, skipBinary, noRecurse);
          }
      }
  
      @Override
      public void exportSystemView(String absPath, OutputStream out, boolean skipBinary, boolean noRecurse) throws IOException, PathNotFoundException, RepositoryException {
          // for root path, create xml content handler and call other export method
          if ("/".equals(absPath)) {
              try {
                  this.exportSystemView(absPath, new ToXmlContentHandler(out), skipBinary, noRecurse);
              } catch (SAXException e) {
                  Exception root = e.getException();
                  if (root instanceof RepositoryException) {
                      throw (RepositoryException) root;
                  } else if (root instanceof IOException) {
                      throw (IOException) root;
                 } else {
                     throw new RepositoryException("Error serializing system view XML", e);
                 }
             }
         } else {
             getWrappedSession().exportSystemView(absPath, out, skipBinary, noRecurse);
         }
     }
 
     @Override
     public void exportDocumentView(String absPath, ContentHandler contentHandler, boolean skipBinary, boolean noRecurse) throws PathNotFoundException, SAXException, RepositoryException {
         // customize exporter for root path to skip jcr:system
         if ("/".equals(absPath)) {
             export(absPath, new DocumentViewExporter(getWrappedSession(), contentHandler, !noRecurse, !skipBinary) {
 
                 @Override
                 protected void exportNode(String uri, String local, Node node) throws RepositoryException, SAXException {
                     if ("jcr:system".equals(node.getName())) {
                         // skip version history
                         return;
                     }
                     super.exportNode(uri, local, node);
                 }
             });
         } else {
             getWrappedSession().exportDocumentView(absPath, contentHandler, skipBinary, noRecurse);
         }
     }
 
     @Override
     public void exportDocumentView(String absPath, OutputStream out, boolean skipBinary, boolean noRecurse) throws IOException, PathNotFoundException, RepositoryException {
         // for root path, create xml content handler and call other export method
         if ("/".equals(absPath)) {
             try {
                 this.exportDocumentView(absPath, new ToXmlContentHandler(out), skipBinary, noRecurse);
             } catch (SAXException e) {
                 Exception root = e.getException();
                 if (root instanceof RepositoryException) {
                     throw (RepositoryException) root;
                 } else if (root instanceof IOException) {
                     throw (IOException) root;
                 } else {
                     throw new RepositoryException("Error serializing system view XML", e);
                 }
             }
         } else {
             getWrappedSession().exportDocumentView(absPath, out, skipBinary, noRecurse);
         }
     }
 
     private void export(String path, Exporter exporter) throws PathNotFoundException, SAXException, RepositoryException {
         Item item = getItem(path);
         if (item.isNode()) {
             exporter.export((Node) item);
         } else {
             throw new PathNotFoundException("XML export is not defined for properties: " + path);
         }
     }
 
 }