001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.component.atom;
018    
019    import java.util.Date;
020    
021    import org.apache.abdera.model.Entry;
022    import org.apache.camel.component.feed.EntryFilter;
023    import org.apache.camel.component.feed.FeedEndpoint;
024    import org.apache.commons.logging.Log;
025    import org.apache.commons.logging.LogFactory;
026    
027    /**
028     * Filters out all entries which occur before the last time of the entry we saw (assuming
029     * entries arrive sorted in order).
030     *
031     * @version $Revision: 816070 $
032     */
033    public class UpdatedDateFilter implements EntryFilter {
034    
035        private static final transient Log LOG = LogFactory.getLog(UpdatedDateFilter.class);
036        private Date lastUpdate;
037    
038        public UpdatedDateFilter(Date lastUpdate) {
039            this.lastUpdate = lastUpdate;
040        }
041    
042        public boolean isValidEntry(FeedEndpoint endpoint, Object feed, Object entry) {        
043            Date updated = ((Entry)entry).getUpdated();
044            if (updated == null) { // never been updated so get published date
045                updated = ((Entry)entry).getPublished();
046            }        
047            if (updated == null) {
048                if (LOG.isDebugEnabled()) {
049                    LOG.debug("No updated time for entry so assuming its valid: entry=[" + entry + "]");
050                }
051                return true;
052            }        
053            if (lastUpdate != null) {
054                if (lastUpdate.after(updated) || lastUpdate.equals(updated)) {
055                    if (LOG.isDebugEnabled()) {
056                        LOG.debug("Entry is older than lastupdate=[" + lastUpdate
057                            + "], no valid entry=[" + entry + "]");
058                    }
059                    return false;
060                }
061            }
062            lastUpdate = updated;
063            return true;
064        }
065    
066    }