editcommunitiesservlet.java

dspace 用j2ee架构的一个数字图书馆.开源程序

/*
 * EditCommunitiesServlet.java
 *
 * Version: $Revision: 1.22 $
 *
 * Date: $Date: 2005/04/20 14:22:30 $
 *
 * 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.admin;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;

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

import org.apache.log4j.Logger;
import org.dspace.app.webui.servlet.DSpaceServlet;
import org.dspace.app.webui.util.FileUploadRequest;
import org.dspace.app.webui.util.JSPManager;
import org.dspace.app.webui.util.UIUtil;
import org.dspace.authorize.AuthorizeException;
import org.dspace.authorize.AuthorizeManager;
import org.dspace.content.Bitstream;
import org.dspace.content.BitstreamFormat;
import org.dspace.content.Collection;
import org.dspace.content.Community;
import org.dspace.content.FormatIdentifier;
import org.dspace.content.Item;
import org.dspace.core.Constants;
import org.dspace.core.Context;
import org.dspace.core.LogManager;
import org.dspace.eperson.Group;

/**
 * Servlet for editing communities and collections, including deletion,
 * creation, and metadata editing
 * 
 * @author Robert Tansley
 * @version $Revision: 1.22 $
 */
public class EditCommunitiesServlet extends DSpaceServlet
{
    /** User wants to edit a community */
    public static final int START_EDIT_COMMUNITY = 1;

    /** User wants to delete a community */
    public static final int START_DELETE_COMMUNITY = 2;

    /** User wants to create a community */
    public static final int START_CREATE_COMMUNITY = 3;

    /** User wants to edit a collection */
    public static final int START_EDIT_COLLECTION = 4;

    /** User wants to delete a collection */
    public static final int START_DELETE_COLLECTION = 5;

    /** User wants to create a collection */
    public static final int START_CREATE_COLLECTION = 6;

    /** User commited community edit or creation */
    public static final int CONFIRM_EDIT_COMMUNITY = 7;

    /** User confirmed community deletion */
    public static final int CONFIRM_DELETE_COMMUNITY = 8;

    /** User commited collection edit or creation */
    public static final int CONFIRM_EDIT_COLLECTION = 9;

    /** User wants to delete a collection */
    public static final int CONFIRM_DELETE_COLLECTION = 10;

    /** Logger */
    private static Logger log = Logger.getLogger(EditCommunitiesServlet.class);

    protected void doDSGet(Context context, HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException,
            SQLException, AuthorizeException
    {
        // GET just displays the list of communities and collections
        showControls(context, request, response);
    }

    protected void doDSPost(Context context, HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException,
            SQLException, AuthorizeException
    {
        // First, see if we have a multipart request (uploading a logo)
        String contentType = request.getContentType();

        if ((contentType != null)
                && (contentType.indexOf("multipart/form-data") != -1))
        {
            // This is a multipart request, so it's a file upload
            processUploadLogo(context, request, response);

            return;
        }

        /*
         * Respond to submitted forms. Each form includes an "action" parameter
         * indicating what needs to be done (from the constants above.)
         */
        int action = UIUtil.getIntParameter(request, "action");

        /*
         * Most of the forms supply one or more of these values. Since we just
         * get null if we try and find something with ID -1, we'll just try and
         * find both here to save hassle later on
         */
        Community community = Community.find(context, UIUtil.getIntParameter(
                request, "community_id"));
        Community parentCommunity = Community.find(context, UIUtil
                .getIntParameter(request, "parent_community_id"));
        Collection collection = Collection.find(context, UIUtil
                .getIntParameter(request, "collection_id"));

        // Just about every JSP will need the values we received
        request.setAttribute("community", community);
        request.setAttribute("parent", parentCommunity);
        request.setAttribute("collection", collection);

        /*
         * First we check for a "cancel" button - if it's been pressed, we
         * simply return to the main control page
         */
        if (request.getParameter("submit_cancel") != null)
        {
            showControls(context, request, response);

            return;
        }

        if (AuthorizeManager.isAdmin(context))
        {
            // set a variable to show all buttons
            request.setAttribute("admin_button", new Boolean(true));
        }

        // Now proceed according to "action" parameter
        switch (action)
        {
        case START_EDIT_COMMUNITY:

            // Display the relevant "edit community" page
            JSPManager.showJSP(request, response, "/tools/edit-community.jsp");

            break;

        case START_DELETE_COMMUNITY:

            // Show "confirm delete" page
            JSPManager.showJSP(request, response,
                    "/tools/confirm-delete-community.jsp");

            break;

        case START_CREATE_COMMUNITY:

            // Display edit community page with empty fields + create button
            JSPManager.showJSP(request, response, "/tools/edit-community.jsp");

            break;

        case START_EDIT_COLLECTION:

            // Display the relevant "edit collection" page
            JSPManager.showJSP(request, response, "/tools/edit-collection.jsp");

            break;

        case START_DELETE_COLLECTION:

            // Show "confirm delete" page
            JSPManager.showJSP(request, response,
                    "/tools/confirm-delete-collection.jsp");

            break;

        case START_CREATE_COLLECTION:

            // Forward to collection creation wizard
            response.sendRedirect(response.encodeRedirectURL(request
                    .getContextPath()
                    + "/tools/collection-wizard?community_id="
                    + community.getID()));

            break;

        case CONFIRM_EDIT_COMMUNITY:

            // Edit or creation of a community confirmed
            processConfirmEditCommunity(context, request, response, community);

            break;

        case CONFIRM_DELETE_COMMUNITY:

            // remember the parent community, if any
            Community parent = community.getParentCommunity();

            // Delete the community
            community.delete();

            // if community was top-level, redirect to community-list page
            if (parent == null)
            {
                response.sendRedirect(response.encodeRedirectURL(request
                        .getContextPath()
                        + "/community-list"));
            }
            else
            // redirect to parent community page
            {
                response.sendRedirect(response.encodeRedirectURL(request
                        .getContextPath()
                        + "/handle/" + parent.getHandle()));
            }

            // Show main control page
            //showControls(context, request, response);
            // Commit changes to DB
            context.complete();

            break;

        case CONFIRM_EDIT_COLLECTION:

            // Edit or creation of a collection confirmed
            processConfirmEditCollection(context, request, response, community,
                    collection);

            break;

        case CONFIRM_DELETE_COLLECTION:

            // Delete the collection
            community.removeCollection(collection);

            // Show main control page
            showControls(context, request, response);

            // Commit changes to DB
            context.complete();

            break;

        default:

            // Erm... weird action value received.
            log.warn(LogManager.getHeader(context, "integrity_error", UIUtil
                    .getRequestLogInfo(request)));
            JSPManager.showIntegrityError(request, response);
        }
    }

    /**
     * Show community home page with admin controls
     * 
     * @param context
     *            Current DSpace context
     * @param request
     *            Current HTTP request
     * @param response
     *            Current HTTP response
     */
    private void showControls(Context context, HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException,
            SQLException, AuthorizeException
    {
        // new approach - eliminate the 'list-communities' page in favor of the
        // community home page, enhanced with admin controls. If no community,
        // or no parent community, just fall back to the community-list page
        Community community = (Community) request.getAttribute("community");

        if (community != null)
        {
            response.sendRedirect(response.encodeRedirectURL(request
                    .getContextPath()
                    + "/handle/" + community.getHandle()));
        }
        else
        {
            // see if a parent community was specified
            Community parent = (Community) request.getAttribute("parent");

            if (parent != null)
            {
                response.sendRedirect(response.encodeRedirectURL(request
                        .getContextPath()
                        + "/handle/" + parent.getHandle()));
            }
            else
            {
                // fall back on community-list page
                response.sendRedirect(response.encodeRedirectURL(request
                        .getContextPath()
                        + "/community-list"));
            }
        }
    }

    /**
     * Create/update community metadata from a posted form
     * 
     * @param context
     *            DSpace context
     * @param request
     *            the HTTP request containing posted info
     * @param response
     *            the HTTP response
     * @param community
     *            the community to update (or null for creation)
     */
    private void processConfirmEditCommunity(Context context,
            HttpServletRequest request, HttpServletResponse response,
            Community community) throws ServletException, IOException,
            SQLException, AuthorizeException
    {
        if (request.getParameter("create").equals("true"))
        {
            // if there is a parent community id specified, create community
            // as its child; otherwise, create it as a top-level community
            int parentCommunityID = UIUtil.getIntParameter(request,
                    "parent_community_id");

            if (parentCommunityID != -1)
            {
                Community parent = Community.find(context, parentCommunityID);

                if (parent != null)
                {
                    community = parent.createSubcommunity();
                }
            }
            else
            {
                community = Community.create(null, context);
            }

            // Set attribute
            request.setAttribute("community", community);
        }

        community.setMetadata("name", request.getParameter("name"));
        community.setMetadata("short_description", request
                .getParameter("short_description"));