/**
* Copyright (c) 2008-2012 The Sakai Foundation
*
* Licensed under the Educational Community 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.osedu.org/licenses/ECL-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.sakaiproject.profile2.tool.dataproviders;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.apache.wicket.injection.web.InjectorHolder;
import org.apache.wicket.markup.repeater.data.IDataProvider;
import org.apache.wicket.model.IModel;
import org.apache.wicket.spring.injection.annot.SpringBean;
import org.sakaiproject.profile2.logic.ProfileConnectionsLogic;
import org.sakaiproject.profile2.model.Person;
import org.sakaiproject.profile2.tool.models.DetachablePersonModel;
import org.sakaiproject.profile2.util.ProfileConstants;
/**
* FriendsFeedDataProvider.java
* Steve Swinsburg
* s.swinsburg@lancaster.ac.uk
* January 2009
*
* This implementation of Wicket's IDataProvider gets a list of friends of userX as Person objects
*/
public class FriendsFeedDataProvider implements IDataProvider<Person>, Serializable {
private static final long serialVersionUID = 1L;
private String userUuid;
private int subListSize = 0;
@SpringBean(name="org.sakaiproject.profile2.logic.ProfileConnectionsLogic")
private ProfileConnectionsLogic connectionsLogic;
public FriendsFeedDataProvider(final String userUuid) {
//inject
InjectorHolder.getInjector().inject(this);
//set userUuid
this.userUuid = userUuid;
//calculate the number we'll have in the feed, 0 < n < ProfileConstants.MAX_FRIENDS_FEED_ITEMS
int count = connectionsLogic.getConnectionsForUserCount(userUuid);
subListSize = ProfileConstants.MAX_FRIENDS_FEED_ITEMS;
if(count < subListSize) {
subListSize = count;
}
}
public Iterator<Person> iterator(int first, int count) {
try {
List<Person> connections = connectionsLogic.getConnectionsForUser(userUuid).subList(first, first + count);
Collections.shuffle(connections);
List<Person> slice = connections.subList(first, first + count);
return slice.iterator();
}
catch (Exception e) {
e.printStackTrace();
return Collections.EMPTY_LIST.iterator();
}
}
public int size() {
return subListSize;
}
public IModel<Person> model(Person object) {
return new DetachablePersonModel(object);
}
public void detach() {}
}