/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* 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.
*/
package org.apache.nutch.keymatch;
import java.util.List;
import java.util.Map;
/**
* <p>Implementation of KeyMatchFilter that simply
* crops the count of matches to defined level or
* by default of 3.</p>
*
* <p>The number of results returned is controlled
* with context parameter under key "count"</p>
*
* @author Sami Siren
*/
public class CountFilter extends AbstractFilter {
public static final String KEY_COUNT="count";
public static final int DEFAULT_COUNT=3;
public KeyMatch[] filter(List matches, Map context) {
int count=DEFAULT_COUNT;
try{
count=Integer.parseInt((String)context.get(KEY_COUNT));
} catch (Exception e){
//ignore
}
if(matches.size()>count) {
return super.filter(matches.subList(0,count), context);
} else {
return super.filter(matches, context);
}
}
}
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