/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. The ASF licenses this file to You
* under the Apache 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.apache.org/licenses/LICENSE-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. For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.examples.simple;
import java.io.InputStream;
import java.net.URL;
import java.util.List;
import org.apache.abdera.Abdera;
import org.apache.abdera.filter.ListParseFilter;
import org.apache.abdera.model.Document;
import org.apache.abdera.model.Entry;
import org.apache.abdera.model.Feed;
import org.apache.abdera.parser.Parser;
import org.apache.abdera.parser.ParserOptions;
import org.apache.abdera.util.Constants;
import org.apache.abdera.util.filter.WhiteListParseFilter;
/**
* Illustrates the use of optimized-parsing using the WhiteListParseFilter. Using this mechanism, only the elements
* added to the ParseFilter will be parsed and added to the Feed Object Model instance. The resulting savings in memory
* and CPU costs is significant.
*/
public class PrintTitles {
public static void main(String args[]) {
InputStream input;
Parser parser = Abdera.getNewParser();
try {
input = new URL(args[0]).openStream();
} catch (Exception e) {
e.printStackTrace();
return;
}
ParserOptions opts = parser.getDefaultParserOptions();
ListParseFilter filter = new WhiteListParseFilter();
filter.add(Constants.FEED);
filter.add(Constants.ENTRY);
filter.add(Constants.TITLE);
opts.setParseFilter(filter);
Document<Feed> doc;
try {
doc = parser.parse(input, "", opts);
} catch (Exception e) {
e.printStackTrace();
return;
}
Feed feed = doc.getRoot();
List<Entry> entries = feed.getEntries();
for (Entry e : entries) {
System.out.println(e.getTitle());
}
}
}