/**
* $Id: RelatedItems.java 5171 2010-07-02 18:20:52Z KevinVandeVelde $
* $URL: http://scm.dspace.org/svn/repo/modules/dspace-discovery/trunk/block/src/main/java/org/dspace/app/xmlui/aspect/discovery/RelatedItems.java $
* *************************************************************************
* Copyright (c) 2002-2009, DuraSpace. All rights reserved
* Licensed under the DuraSpace License.
*
* A copy of the DuraSpace License has been included in this
* distribution and is available at: http://scm.dspace.org/svn/repo/licenses/LICENSE.txt
*/
package org.dspace.app.xmlui.aspect.discovery;
import java.io.IOException;
import java.sql.SQLException;
import java.util.*;
import java.util.List;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Request;
import org.apache.log4j.Logger;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.common.util.SimpleOrderedMap;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.SolrDocument;
import org.dspace.app.xmlui.cocoon.AbstractDSpaceTransformer;
import org.dspace.app.xmlui.utils.HandleUtil;
import org.dspace.app.xmlui.utils.UIException;
import org.dspace.app.xmlui.wing.Message;
import org.dspace.app.xmlui.wing.WingException;
import org.dspace.app.xmlui.wing.element.*;
import org.dspace.authorize.AuthorizeException;
import org.dspace.content.DSpaceObject;
import org.dspace.content.Item;
import org.dspace.content.Community;
import org.dspace.content.Collection;
import org.dspace.core.ConfigurationManager;
import org.dspace.core.LogManager;
import org.dspace.discovery.SearchUtils;
import org.xml.sax.SAXException;
import org.dspace.discovery.SearchServiceException;
/**
* Display a single item.
*
* @author Mark Diggory
*/
public class RelatedItems extends AbstractFiltersTransformer
{
private static final Logger log = Logger.getLogger(RelatedItems.class);
/** Language strings */
private static final Message T_dspace_home =
message("xmlui.general.dspace_home");
private static final Message T_trail =
message("xmlui.ArtifactBrowser.ItemViewer.trail");
private static final Message T_show_simple =
message("xmlui.ArtifactBrowser.ItemViewer.show_simple");
private static final Message T_show_full =
message("xmlui.ArtifactBrowser.ItemViewer.show_full");
private static final Message T_head_parent_collections =
message("xmlui.ArtifactBrowser.ItemViewer.head_parent_collections");
/**
* The cache of recently submitted items
*/
protected QueryResponse queryResults;
/**
* Cached query arguments
*/
protected SolrQuery queryArgs;
/**
* Display a single item
*/
public void addBody(Body body) throws SAXException, WingException,
UIException, SQLException, IOException, AuthorizeException
{
DSpaceObject dspaceObject = HandleUtil.obtainHandle(objectModel);
if (!(dspaceObject instanceof Item))
return;
Item item = (Item) dspaceObject;
try {
performSearch(item);
} catch (SearchServiceException e) {
log.error(e.getMessage(),e);
}
// Build the collection viewer division.
if (this.queryResults != null) {
NamedList nList = this.queryResults.getResponse();
SimpleOrderedMap<SolrDocumentList> mlt = (SimpleOrderedMap<SolrDocumentList>)nList.get("moreLikeThis");
//home.addPara(nList.toString());
if(mlt != null && 0 < mlt.size())
{
//TODO: also make sure if an item is unresolved we do not end up with an empty referenceset !
List<DSpaceObject> dsos = new ArrayList<DSpaceObject>();
for(Map.Entry<String,SolrDocumentList> entry : mlt)
{
String key = entry.getKey();
//org.dspace.app.xmlui.wing.element.List mltList = mltDiv.addList(key);
//mltList.setHead(key);
for(SolrDocument doc : entry.getValue())
{
try{
dsos.add(SearchUtils.findDSpaceObject(context, doc));
}catch(Exception e){
log.error(LogManager.getHeader(context, "Error while resolving related item doc to dso", "Main item: " + item.getID()));
}
//mltList.addItem().addContent(doc.toString());
}
}
if(0 < dsos.size()){
Division home = body.addDivision("test", "secondary related");
String name = "Related Items";
//if (name == null || name.length() == 0)
// home.setHead(T_untitled);
//else
home.setHead(name);
Division mltDiv = home.addDivision("item-related", "secondary related");
mltDiv.setHead("Items By Author:");
ReferenceSet set = mltDiv.addReferenceSet(
"item-related-items", ReferenceSet.TYPE_SUMMARY_LIST,
null, "related-items");
for (DSpaceObject dso : dsos) {
Reference ref = set.addReference(dso);
}
}
}
}
}
@Override
public void performSearch(DSpaceObject dso) throws SearchServiceException {
if(queryResults != null)
return;
this.queryArgs = new SolrQuery();
this.queryArgs.setRows(1);
this.queryArgs.add("fl","author,handle");
this.queryArgs.add("mlt","true");
this.queryArgs.add("mlt.fl","author,handle");
this.queryArgs.add("mlt.mindf","1");
this.queryArgs.add("mlt.mintf","1");
this.queryArgs.setQuery("handle:" + dso.getHandle());
this.queryArgs.setRows(1);
queryResults = getSearchService().search(queryArgs);
}
/**
* Recycle
*/
public void recycle() {
this.queryArgs = null;
this.queryResults = null;
super.recycle();
}
}