+/*
+ * Copyright (C) 2001, 2002 The Mir-coders group
+ *
+ * This file is part of Mir.
+ *
+ * Mir is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Mir is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Mir; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * In addition, as a special exception, The Mir-coders gives permission to link
+ * the code of this program with any library licensed under the Apache Software License,
+ * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
+ * (or with modified versions of the above that use the same license as the above),
+ * and distribute linked combinations including the two. You must obey the
+ * GNU General Public License in all respects for all of the code used other than
+ * the above mentioned libraries. If you modify this file, you may extend this
+ * exception to your version of the file, but you are not obligated to do so.
+ * If you do not wish to do so, delete this exception statement from your version.
+ */
+package mir.producer;
+
+import java.util.*;
+
+import mir.log.LoggerWrapper;
+import mir.rss.RSSData;
+import mir.rss.*;
+import mir.util.ExceptionFunctions;
+import mir.util.ParameterExpander;
+
+public class RDFAggregatorProducerNode implements ProducerNode {
+ private String key;
+ private String source;
+ private String order;
+ private String filter;
+
+ public RDFAggregatorProducerNode(String aKey, String aSource, String anOrder, String aFilter) {
+ key = aKey;
+ source=aSource;
+ order=anOrder;
+ filter=aFilter;
+ }
+
+ public void produce(Map aValueMap, String aVerb, LoggerWrapper aLogger) throws ProducerFailure {
+ try {
+ aLogger.debug(source);
+ String evaluatedKey = ParameterExpander.expandExpression( aValueMap, key );
+ String evaluatedOrder = ParameterExpander.expandExpression( aValueMap, order );
+ Object evaluatedSource = ParameterExpander.evaluateExpression( aValueMap, source );
+
+ Object aggregator = aValueMap.get(evaluatedKey);
+
+ if (aggregator == null) {
+ aLogger.debug("creating");
+ aggregator = new RSSAggregator(100, "dc:date", true, null, null);
+ aValueMap.put(evaluatedKey, aggregator);
+ }
+
+ if (aggregator instanceof RSSAggregator) {
+ RSSAggregator agg = (RSSAggregator) aggregator;
+
+ if (evaluatedSource instanceof List) {
+ aLogger.debug("appending");
+ agg.appendItems( (List) evaluatedSource);
+ aLogger.debug("now: " + agg.getItems().size());
+ }
+ else
+ throw new ProducerExc("List expected, " + evaluatedSource.toString() + " found");
+ }
+ else
+ throw new ProducerExc("RSSAggregator expected, " + aggregator.toString() + " found");
+ }
+ catch (Throwable t) {
+ Throwable s = ExceptionFunctions.traceCauseException(t);
+ aLogger.error("Error while aggregating RDF data: " + s.getClass().getName()+","+ s.getMessage());
+ }
+ };
+}