org.muse.mneme.tool.QuestionPreviewView.java Source code

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Here is the source code for org.muse.mneme.tool.QuestionPreviewView.java

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/**********************************************************************************
 * $URL$
 * $Id$
 ***********************************************************************************
 *
 * Copyright (c) 2007 The Regents of the University of Michigan & Foothill College, ETUDES Project
 * 
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * 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 License for the specific language governing permissions and
 * limitations under the License.
 *
 **********************************************************************************/

package org.muse.mneme.tool;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.muse.ambrosia.api.Context;
import org.muse.ambrosia.util.ControllerImpl;
import org.muse.mneme.api.Question;
import org.muse.mneme.api.QuestionService;
import org.sakaiproject.util.StringUtil;
import org.sakaiproject.util.Web;

/**
 * The /question_preview view for the mneme tool.
 */
public class QuestionPreviewView extends ControllerImpl {
    /** Our log. */
    private static Log M_log = LogFactory.getLog(QuestionPreviewView.class);

    /** Question service. */
    protected QuestionService questionService = null;

    /**
     * Shutdown.
     */
    public void destroy() {
        M_log.info("destroy()");
    }

    /**
     * {@inheritDoc}
     */
    public void get(HttpServletRequest req, HttpServletResponse res, Context context, String[] params)
            throws IOException {
        // we need a qid, then any number of parameters to form the return destination
        if (params.length < 3) {
            throw new IllegalArgumentException();
        }

        String destination = null;
        if (params.length > 3) {
            destination = "/" + StringUtil.unsplit(params, 3, params.length - 3, "/");
        }

        // if not specified, go to the main pools page
        else {
            destination = "/pools";
        }
        context.put("return", destination);

        String questionId = params[2];
        Question question = questionService.getQuestion(questionId);
        if (question == null) {
            // redirect to error
            res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid)));
            return;
        }
        context.put("question", question);

        // security check
        if (!questionService.allowEditQuestion(question)) {
            // redirect to error
            res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized)));
            return;
        }

        // render
        uiService.render(ui, context);
    }

    /**
     * Final initialization, once all dependencies are set.
     */
    public void init() {
        super.init();
        M_log.info("init()");
    }

    /**
     * {@inheritDoc}
     */
    public void post(HttpServletRequest req, HttpServletResponse res, Context context, String[] params)
            throws IOException {
        // read form
        String destination = uiService.decode(req, context);

        // go there!
        res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, destination)));
    }

    /**
     * Set the question service.
     * 
     * @param service
     *        The question service.
     */
    public void setQuestionService(QuestionService service) {
        this.questionService = service;
    }
}