| /** |
| * 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.scoring.similarity.cosine; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| public class DocVector { |
| |
| public HashMap<Integer, Long> termVector; |
| public HashMap<String, Integer> termFreqVector; |
| |
| public DocVector() { |
| termFreqVector = new HashMap<>(); |
| } |
| |
| public void setTermFreqVector(HashMap<String, Integer> termFreqVector) { |
| this.termFreqVector = termFreqVector; |
| } |
| |
| public void setVectorEntry(int pos, long freq) { |
| termVector.put(pos, freq); |
| } |
| |
| public float dotProduct(DocVector docVector) { |
| float product = 0; |
| for(Map.Entry<String, Integer> entry : termFreqVector.entrySet()) { |
| if(docVector.termFreqVector.containsKey(entry.getKey())) { |
| product += docVector.termFreqVector.get(entry.getKey())*entry.getValue(); |
| } |
| } |
| return product; |
| } |
| |
| public float getL2Norm() { |
| float sum = 0; |
| for(Map.Entry<String, Integer> entry : termFreqVector.entrySet()) { |
| sum += entry.getValue()*entry.getValue(); |
| } |
| return (float) Math.sqrt(sum); |
| } |
| |
| } |