JSPSelectCollectionStep.java from DSpace at Krugle
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/*
* JSPSelectCollectionStep.java
*
* Version: $Revision$
*
* Date: $Date$
*
* 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.submit.step;
import java.io.IOException;
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.util.SubmissionInfo;
import org.dspace.app.webui.submit.JSPStep;
import org.dspace.app.webui.submit.JSPStepManager;
import org.dspace.app.webui.util.JSPManager;
import org.dspace.app.webui.util.UIUtil;
import org.dspace.authorize.AuthorizeException;
import org.dspace.content.Collection;
import org.dspace.content.Community;
import org.dspace.core.Constants;
import org.dspace.core.Context;
import org.dspace.submit.step.SelectCollectionStep;
/**
* Step which controls selecting a Collection for the Item Submission process
* for DSpace.
* <P>
* This JSPStepManager class works with the SubmissionController servlet
* for the JSP-UI
* <P>
* The following methods are called in this order:
* <ul>
* <li>Call doPreProcessing() method</li>
* <li>If showJSP() was specified from doPreProcessing(), then the JSP
* specified will be displayed</li>
* <li>If showJSP() was not specified from doPreProcessing(), then the
* doProcessing() method is called an the step completes immediately</li>
* <li>Call doProcessing() method after the user returns from the JSP, in order
* to process the user input</li>
* <li>Call doPostProcessing() method to determine if more user interaction is
* required, and if further JSPs need to be called.</li>
* <li>If there are more "pages" in this step then, the process begins again
* (for the new page).</li>
* <li>Once all pages are complete, control is forwarded back to the
* SubmissionController, and the next step is called.</li>
* </ul>
*
* @see org.dspace.app.webui.servlet.SubmissionController
* @see org.dspace.app.webui.submit.JSPStep
* @see org.dspace.submit.step.SelectCollectionStep
*
* @author Tim Donohue
* @version $Revision$
*/
public class JSPSelectCollectionStep extends SelectCollectionStep implements JSPStep
{
/** JSP which displays HTML for this Class * */
private static final String SELECT_COLLECTION_JSP = "/submit/select-collection.jsp";
/** log4j logger */
private static Logger log = Logger.getLogger(JSPSelectCollectionStep.class);
/**
* Do any pre-processing to determine which JSP (if any) is used to generate
* the UI for this step. This method should include the gathering and
* validating of all data required by the JSP. In addition, if the JSP
* requires any variable to passed to it on the Request, this method should
* set those variables.
* <P>
* If this step requires user interaction, then this method must call the
* JSP to display, using the "showJSP()" method of the JSPStepManager class.
* <P>
* If this step doesn't require user interaction OR you are solely using
* Manakin for your user interface, then this method may be left EMPTY,
* since all step processing should occur in the doProcessing() method.
*
* @param context
* current DSpace context
* @param request
* current servlet request object
* @param response
* current servlet response object
* @param subInfo
* submission info object
*/
public void doPreProcessing(Context context, HttpServletRequest request,
HttpServletResponse response, SubmissionInfo subInfo)
throws ServletException, IOException, SQLException,
AuthorizeException
{
/*
* Possible parameters from JSP:
*
* collection= <collection_id> - a collection that has already been
* selected!
*
* With no parameters, this servlet prepares for display of the Select
* Collection JSP.
*/
String collectionID = request.getParameter("collection");
Collection col = null;
if (collectionID != null)
{
col = Collection.find(context, Integer.parseInt(collectionID));
}
// if we already have a valid collection, then we can forward directly
// to post-processing
if (col != null)
{
log
.debug("Select Collection page skipped, since a Collection ID was already found. Collection ID="
+ collectionID);
}
else
{
// gather info for JSP page
Community com = UIUtil.getCommunityLocation(request);
Collection[] collections;
if (com != null)
{
// In a community. Show collections in that community only.
collections = Collection.findAuthorized(context, com,
Constants.ADD);
}
else
{
// Show all collections
collections = Collection.findAuthorized(context, null,
Constants.ADD);
}
// This is a special case, where the user came back to this
// page after not selecting a collection. This will display
// the "Please select a collection" message to the user
if (collectionID != null && Integer.parseInt(collectionID) == -1)
{
// specify "no collection" error message should be displayed
request.setAttribute("no.collection", new Boolean(true));
}
// save collections to request for JSP
request.setAttribute("collections", collections);
// we need to load the select collection JSP
JSPStepManager.showJSP(request, response, subInfo, SELECT_COLLECTION_JSP);
}
}
/**
* Do any post-processing after the step's backend processing occurred (in
* the doProcessing() method).
* <P>
* It is this method's job to determine whether processing completed
* successfully, or display another JSP informing the users of any potential
* problems/errors.
* <P>
* If this step doesn't require user interaction OR you are solely using
* Manakin for your user interface, then this method may be left EMPTY,
* since all step processing should occur in the doProcessing() method.
*
* @param context
* current DSpace context
* @param request
* current servlet request object
* @param response
* current servlet response object
* @param subInfo
* submission info object
* @param status
* any status/errors reported by doProcessing() method
*/
public void doPostProcessing(Context context, HttpServletRequest request,
HttpServletResponse response, SubmissionInfo subInfo, int status)
throws ServletException, IOException, SQLException,
AuthorizeException
{
// if the user didn't select a collection,
// send him/her back to "select a collection" page
if (status == STATUS_NO_COLLECTION)
{
// specify "no collection" error message should be displayed
request.setAttribute("no.collection", new Boolean(true));
// reload this page, by re-calling doPreProcessing()
doPreProcessing(context, request, response, subInfo);
}
else if (status == STATUS_INVALID_COLLECTION)
{
JSPManager.showInvalidIDError(request, response, request
.getParameter("collection"), Constants.COLLECTION);
}
}
}
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