/*
 * 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 services;

import java.util.Iterator;
import java.util.Vector;

import org.osoa.sca.annotations.Reference;

public class IntermediateCollectorImpl implements IntermediateCollector {

private Vector<KeyValuePair> table = new Vector<KeyValuePair>();
	
	@Reference
	public Reducer myReducer;
	
	
	public void collect(String key, int value) {
		table.add(new KeyValuePair(key, value));
	}
	
	public void reducePhase() {	
		java.util.Collections.sort(table);
		
		Iterator<KeyValuePair> it = table.iterator();
		
		//no data
		if(!it.hasNext()) {
			return;
		}
		
		Vector<Integer> values = new Vector<Integer>();
		KeyValuePair last = it.next();
		values.add(last.value);
		while(it.hasNext()) {
			KeyValuePair curr = it.next();
			if(last.compareTo(curr) == 0) {
				values.add(curr.value);
				last = curr;
			}
			else {
				myReducer.reduce(last.key, values.iterator());
				values.clear();
				values.add(curr.value);
				last = curr;
				
			}	
		}
		
		myReducer.reduce(last.key, values.iterator());
		
	}

}