| /* |
| * 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.commons.text.similarity; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Java implementation of Python's collections Counter module. |
| * |
| * <p>It counts how many times each element provided occurred in an array and |
| * returns a dict with the element as key and the count as value.</p> |
| * |
| * @see <a href="https://docs.python.org/dev/library/collections.html#collections.Counter"> |
| * https://docs.python.org/dev/library/collections.html#collections.Counter</a> |
| * |
| * @since 1.0 |
| */ |
| final class Counter { |
| |
| /** |
| * Hidden constructor. |
| */ |
| private Counter() { |
| super(); |
| } |
| |
| /** |
| * It counts how many times each element provided occurred in an array and |
| * returns a dict with the element as key and the count as value. |
| * |
| * @param tokens array of tokens |
| * @return dict, where the elements are key, and the count the value |
| */ |
| public static Map<CharSequence, Integer> of(final CharSequence[] tokens) { |
| final Map<CharSequence, Integer> innerCounter = new HashMap<>(); |
| for (final CharSequence token : tokens) { |
| if (innerCounter.containsKey(token)) { |
| int value = innerCounter.get(token); |
| innerCounter.put(token, ++value); |
| } else { |
| innerCounter.put(token, 1); |
| } |
| } |
| return innerCounter; |
| } |
| |
| } |