001/*
002 *  Copyright 2013 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.plugins.cart.observers;
017
018import java.util.Map;
019
020import org.apache.avalon.framework.service.ServiceException;
021import org.apache.avalon.framework.service.ServiceManager;
022import org.apache.avalon.framework.service.Serviceable;
023
024import org.ametys.cms.ObservationConstants;
025import org.ametys.plugins.cart.Cart;
026import org.ametys.plugins.cart.Cart.CartElementType;
027import org.ametys.plugins.repository.AmetysObjectIterable;
028import org.ametys.plugins.repository.AmetysObjectResolver;
029import org.ametys.core.observation.Event;
030import org.ametys.core.observation.Observer;
031
032/**
033 * Observes deletion on contents to delete contents from carts
034 */
035public class ContentDeletedObserver implements Observer, Serviceable
036{
037    private AmetysObjectResolver _resolver;
038    
039    @Override
040    public void service(ServiceManager smanager) throws ServiceException
041    {
042        _resolver = (AmetysObjectResolver) smanager.lookup(AmetysObjectResolver.ROLE);
043    }
044    
045    @Override
046    public boolean supports(Event event)
047    {
048        return event.getId().equals(ObservationConstants.EVENT_CONTENT_DELETED);
049    }
050
051    @Override
052    public int getPriority(Event event)
053    {
054        return 0;
055    }
056
057    @Override
058    public void observe(Event event, Map<String, Object> transientVars) throws Exception
059    {
060        Map<String, Object> args = event.getArguments();
061        String contentId = (String) args.get(ObservationConstants.ARGS_CONTENT_ID);
062        
063        String xPathQuery = "//element(*, ametys:cart)[@ametys:contents = '" + contentId + "']";
064        AmetysObjectIterable<Cart> carts = _resolver.query(xPathQuery);
065        
066        for (Cart cart : carts)
067        {
068            cart.removeElement(contentId, CartElementType.CONTENT);
069            cart.saveChanges();
070        }
071
072    }
073
074}