ApacheVFSOutputHandler.java

/*
 * This program is free software; you can redistribute it and/or modify it under the 
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software 
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this 
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html 
 * or from the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * Copyright 2006 - 2009 Pentaho Corporation.  All rights reserved.
 *
 *
 * @created Dec 21, 2006 
 * @author James Dixon
 * 
 */

package org.pentaho.platform.plugin.outputs;

import java.io.OutputStream;

import org.apache.commons.vfs.FileContent;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystemManager;
import org.apache.commons.vfs.VFS;
import org.pentaho.platform.api.repository.IContentItem;
import org.pentaho.platform.engine.core.output.SimpleContentItem;
import org.pentaho.platform.engine.services.messages.Messages;
import org.pentaho.platform.engine.services.outputhandler.BaseOutputHandler;
import org.pentaho.platform.util.logging.Logger;

public class ApacheVFSOutputHandler extends BaseOutputHandler {

  @Override
  public IContentItem getFileOutputContentItem() {

    String contentRef = getContentRef();
    try {
      String contentName = getHandlerId().substring(4) + ":" + contentRef; //$NON-NLS-1$
      FileSystemManager fsManager = VFS.getManager();
      if (fsManager == null) {
        Logger.error(ApacheVFSOutputHandler.class.getName(), Messages.getInstance()
            .getString("ApacheVFSOutputHandler.ERROR_0001_CANNOT_GET_VFSMGR")); //$NON-NLS-1$
        return null;
      }
      FileObject file = fsManager.resolveFile(contentName);
      if (file == null) {
        Logger.error(ApacheVFSOutputHandler.class.getName(), Messages.getInstance().getString(
            "ApacheVFSOutputHandler.ERROR_0002_CANNOT_GET_VF", contentName)); //$NON-NLS-1$
        return null;
      }
      if (!file.isWriteable()) {
        Logger.error(ApacheVFSOutputHandler.class.getName(), Messages.getInstance().getString(
            "ApacheVFSOutputHandler.ERROR_0003_CANNOT_WRITE", contentName)); //$NON-NLS-1$
        return null;
      }
      FileContent fileContent = file.getContent();
      if (fileContent == null) {
        Logger.error(ApacheVFSOutputHandler.class.getName(), Messages.getInstance().getString(
            "ApacheVFSOutputHandler.ERROR_0004_CANNOT_GET_CTX", contentName)); //$NON-NLS-1$
        return null;
      }
      OutputStream outputStream = fileContent.getOutputStream();

      SimpleContentItem content = new SimpleContentItem(outputStream);
      return content;
    } catch (Throwable t) {
      Logger.error(ApacheVFSOutputHandler.class.getName(), Messages.getInstance().getString(
          "ApacheVFSOutputHandler.ERROR_0005_CANNOT_GET_HANDLER", contentRef), t); //$NON-NLS-1$
    }

    return null;
  }

}