SaikuAdhocContentGenerator.java

/*
 * Copyright (C) 2011 Marius Giepz
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

package org.saiku.adhoc.service;

import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.platform.api.engine.IParameterProvider;
import org.pentaho.platform.engine.services.solution.SimpleContentGenerator;
import org.saiku.adhoc.service.repository.FileExplorer;



/**
 * @author mgiepz
 *
 */
public class SaikuAdhocContentGenerator extends SimpleContentGenerator {

	private static final long serialVersionUID = -9180003935693305152L;
	private static final Log logger = LogFactory
	.getLog(SaikuAdhocContentGenerator.class);

	public String getMimeType() {
		return "text/html";
	}

	public Log getLogger() {
		return logger;
	}

	@Override
	public void createContent(OutputStream out) throws Exception {
		{

			final IParameterProvider pathParams = parameterProviders.get("path");
			final IParameterProvider requestParams = parameterProviders.get("request");

			try
			{

				final Class[] params =
				{
						IParameterProvider.class, OutputStream.class
				};

				final String method = pathParams.getStringParameter("path", null).split("/")[1].toLowerCase();

				try
				{
					final Method mthd = this.getClass().getMethod(method, params);
					mthd.invoke(this, requestParams, out);
				}
				catch (NoSuchMethodException e)
				{
					logger.error("could not invoke " + method);
				}
				catch (InvocationTargetException e)
				{
					//get to the cause and rethrow properly
					Throwable target = e.getTargetException();
					if (!e.equals(target))
					{//just in case
						//get to the real cause
						while (target != null && target instanceof InvocationTargetException)
						{
							target = ((InvocationTargetException) target).getTargetException();
						}
					}
					if (target instanceof Exception)
					{
						throw (Exception) target;
					}
					else
					{
						throw new Exception(target);
					}
				}
			}
			catch (Exception e)
			{
				final String message = e.getCause() != null ? e.getCause().getClass().getName() + " - " + e.getCause().getMessage() : e.getClass().getName() + " - " + e.getMessage();
				logger.error(message, e);
			}
		}
	}

	public void explorefolder(final IParameterProvider pathParams, final OutputStream out)
	{
		final String folder = pathParams.getStringParameter("dir", null);
		final String fileExtensions = pathParams.getStringParameter("fileExtensions", null);
		FileExplorer.getInstance().browse(folder, fileExtensions, userSession, out);
	}

}