/*
* Cloud9: A MapReduce Library for Hadoop
*
* Licensed 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 edu.umd.cloud9.util;
import org.apache.hadoop.util.PriorityQueue;
import edu.umd.cloud9.io.pair.PairOfIntFloat;
public class TopNScoredInts {
private class ScoredIntPriorityQueue extends
PriorityQueue<PairOfIntFloat> {
private ScoredIntPriorityQueue(int maxSize) {
super.initialize(maxSize);
}
@Override
protected boolean lessThan(Object obj0, Object obj1) {
return ((PairOfIntFloat) obj0).getRightElement() < ((PairOfIntFloat) obj1).getRightElement() ?
true : false;
}
}
private final ScoredIntPriorityQueue queue;
public TopNScoredInts(int n) {
queue = new ScoredIntPriorityQueue(n);
}
public void add(int n, float f) {
queue.insert(new PairOfIntFloat(n, f));
}
public PairOfIntFloat[] extractAll() {
int len = queue.size();
PairOfIntFloat[] arr = (PairOfIntFloat[]) new PairOfIntFloat[len];
for (int i = 0; i < len; i++) {
arr[len - 1 - i] = queue.pop();
}
return arr;
}
}