Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions
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 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.
import  org.apache.hadoop.mapreduce.Reducer;
public final class SlopeOnePrefsToDiffsReducer
    extends Reducer<Text, ItemPrefWritableItemItemWritable, FloatWritable> {
  protected void reduce(Text keyIterable<ItemPrefWritablevalues, Context context)
      throws IOExceptionInterruptedException {
    List<ItemPrefWritableprefs = new ArrayList<ItemPrefWritable>();
    for (ItemPrefWritable value : values) {
      prefs.add(new ItemPrefWritable(value));
    Collections.sort(prefs, ByItemIDComparator.getInstance());
    int size = prefs.size();
    for (int i = 0; i < sizei++) {
      ItemPrefWritable first = prefs.get(i);
      long itemAID = first.getItemID();
      float itemAValue = first.getPrefValue();
      for (int j = i + 1; j < sizej++) {
        ItemPrefWritable second = prefs.get(j);
        long itemBID = second.getItemID();
        float itemBValue = second.getPrefValue();
        context.write(new ItemItemWritable(itemAIDitemBID), new FloatWritable(itemBValue - itemAValue));
New to GrepCode? Check out our FAQ X