mydspaceservlet.java

dspace 用j2ee架构的一个数字图书馆.开源程序

/*
 * MyDSpaceServlet.java
 *
 * Version: $Revision: 1.14 $
 *
 * Date: $Date: 2005/10/13 05:48:02 $
 *
 * Copyright (c) 2002-2005, Hewlett-Packard Company and Massachusetts
 * Institute of Technology.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of the Hewlett-Packard Company nor the name of the
 * Massachusetts Institute of Technology nor the names of their
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
package org.dspace.app.webui.servlet;

import java.io.IOException;
import java.sql.SQLException;
import java.util.LinkedList;
import java.util.List;

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

import org.apache.log4j.Logger;
import org.dspace.app.webui.util.JSPManager;
import org.dspace.app.webui.util.UIUtil;
import org.dspace.authorize.AuthorizeException;
import org.dspace.content.Item;
import org.dspace.content.ItemIterator;
import org.dspace.content.SupervisedItem;
import org.dspace.content.WorkspaceItem;
import org.dspace.core.Context;
import org.dspace.core.LogManager;
import org.dspace.eperson.Group;
import org.dspace.handle.HandleManager;
import org.dspace.workflow.WorkflowItem;
import org.dspace.workflow.WorkflowManager;

/**
 * Servlet for constructing the components of the "My DSpace" page
 * 
 * @author Robert Tansley
 * @version $Id: MyDSpaceServlet.java,v 1.14 2005/10/13 05:48:02 syeadon Exp $
 */
public class MyDSpaceServlet extends DSpaceServlet
{
    /** Logger */
    private static Logger log = Logger.getLogger(MyDSpaceServlet.class);

    /** The main screen */
    public static final int MAIN_PAGE = 0;

    /** The remove item page */
    public static final int REMOVE_ITEM_PAGE = 1;

    /** The preview task page */
    public static final int PREVIEW_TASK_PAGE = 2;

    /** The perform task page */
    public static final int PERFORM_TASK_PAGE = 3;

    /** The "reason for rejection" page */
    public static final int REJECT_REASON_PAGE = 4;

    protected void doDSGet(Context context, HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException,
            SQLException, AuthorizeException
    {
        // GET displays the main page - everthing else is a POST
        showMainPage(context, request, response);
    }

    protected void doDSPost(Context context, HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException,
            SQLException, AuthorizeException
    {
        // First get the step
        int step = UIUtil.getIntParameter(request, "step");

        switch (step)
        {
        case MAIN_PAGE:
            processMainPage(context, request, response);

            break;

        case REMOVE_ITEM_PAGE:
            processRemoveItem(context, request, response);

            break;

        case PREVIEW_TASK_PAGE:
            processPreviewTask(context, request, response);

            break;

        case PERFORM_TASK_PAGE:
            processPerformTask(context, request, response);

            break;

        case REJECT_REASON_PAGE:
            processRejectReason(context, request, response);

            break;

        default:
            log.warn(LogManager.getHeader(context, "integrity_error", UIUtil
                    .getRequestLogInfo(request)));
            JSPManager.showIntegrityError(request, response);
        }
    }

    // ****************************************************************
    // ****************************************************************
    // METHODS FOR PROCESSING POSTED FORMS
    // ****************************************************************
    // ****************************************************************
    protected void processMainPage(Context context, HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException,
            SQLException, AuthorizeException
    {
        String buttonPressed = UIUtil.getSubmitButton(request, "submit_own");

        // Get workspace item, if any
        WorkspaceItem workspaceItem;

        try
        {
            int wsID = Integer.parseInt(request.getParameter("workspace_id"));
            workspaceItem = WorkspaceItem.find(context, wsID);
        }
        catch (NumberFormatException nfe)
        {
            workspaceItem = null;
        }

        // Get workflow item specified, if any
        WorkflowItem workflowItem;

        try
        {
            int wfID = Integer.parseInt(request.getParameter("workflow_id"));
            workflowItem = WorkflowItem.find(context, wfID);
        }
        catch (NumberFormatException nfe)
        {
            workflowItem = null;
        }

        // Respond to button press
        boolean ok = false;

        if (buttonPressed.equals("submit_new"))
        {
            // New submission: Redirect to submit
            response.sendRedirect(response.encodeRedirectURL(request
                    .getContextPath()
                    + "/submit"));
            ok = true;
        }
        else if (buttonPressed.equals("submit_own"))
        {
            // Review own submissions
            showPreviousSubmissions(context, request, response);
            ok = true;
        }
        else if (buttonPressed.equals("submit_resume"))
        {
            // User clicked on a "Resume" button for a workspace item.
            String wsID = request.getParameter("workspace_id");
            response.sendRedirect(response.encodeRedirectURL(request
                    .getContextPath()
                    + "/submit?resume=" + wsID));
            ok = true;
        }
        else if (buttonPressed.equals("submit_delete"))
        {
            // User clicked on a "Remove" button for a workspace item
            if (workspaceItem != null)
            {
                log.info(LogManager.getHeader(context, "confirm_removal",
                        "workspace_item_id=" + workspaceItem.getID()));

                request.setAttribute("workspace.item", workspaceItem);
                JSPManager.showJSP(request, response,
                        "/mydspace/remove-item.jsp");
            }
            else
            {
                log.warn(LogManager.getHeader(context, "integrity_error",
                        UIUtil.getRequestLogInfo(request)));
                JSPManager.showIntegrityError(request, response);
            }

            ok = true;
        }
        else if (buttonPressed.equals("submit_claim"))
        {
            // User clicked "take task" button on workflow task
            if (workflowItem != null)
            {
                log.info(LogManager.getHeader(context, "view_workflow",
                        "workflow_id=" + workflowItem.getID()));

                request.setAttribute("workflow.item", workflowItem);
                JSPManager.showJSP(request, response,
                        "/mydspace/preview-task.jsp");
                ok = true;
            }
        }
        else if (buttonPressed.equals("submit_perform"))
        {
            // User clicked "Do This Task" button on workflow task
            if (workflowItem != null)
            {
                log.info(LogManager.getHeader(context, "view_workflow",
                        "workflow_id=" + workflowItem.getID()));

                request.setAttribute("workflow.item", workflowItem);
                JSPManager.showJSP(request, response,
                        "/mydspace/perform-task.jsp");
                ok = true;
            }
        }
        else if (buttonPressed.equals("submit_return"))
        {
            // User clicked "Return to pool" button on workflow task
            if (workflowItem != null)
            {
                log.info(LogManager.getHeader(context, "unclaim_workflow",
                        "workflow_id=" + workflowItem.getID()));

                WorkflowManager.unclaim(context, workflowItem, context
                        .getCurrentUser());

                showMainPage(context, request, response);
                context.complete();
                ok = true;
            }
        }

        if (ok == false)
        {
            log.warn(LogManager.getHeader(context, "integrity_error", UIUtil
                    .getRequestLogInfo(request)));
            JSPManager.showIntegrityError(request, response);
        }
    }

    /**
     * Process input from remove item page
     * 
     * @param context
     *            current context
     * @param request
     *            current servlet request object
     * @param response
     *            current servlet response object
     */
    private void processRemoveItem(Context context, HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException,
            SQLException, AuthorizeException
    {
        String buttonPressed = UIUtil.getSubmitButton(request, "submit_cancel");

        // Get workspace item
        WorkspaceItem workspaceItem;

        try
        {
            int wsID = Integer.parseInt(request.getParameter("workspace_id"));
            workspaceItem = WorkspaceItem.find(context, wsID);
        }
        catch (NumberFormatException nfe)
        {
            workspaceItem = null;
        }

        if (workspaceItem == null)
        {
            log.warn(LogManager.getHeader(context, "integrity_error", UIUtil
                    .getRequestLogInfo(request)));
            JSPManager.showIntegrityError(request, response);

            return;
        }

        // We have a workspace item
        if (buttonPressed.equals("submit_delete"))
        {
            // User has clicked on "delete"
            log.info(LogManager.getHeader(context, "remove_submission",
                    "workspace_item_id=" + workspaceItem.getID() + ",item_id="
                            + workspaceItem.getItem().getID()));
            workspaceItem.deleteAll();
            showMainPage(context, request, response);
            context.complete();
        }
        else
        {
            // User has cancelled. Back to main page.
            showMainPage(context, request, response);
        }
    }