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/*
 * 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;
import java.util.stream.Stream;

/**
 * Java implementation of Python's collections Counter module.
 *
 * 

It counts how many times each element provided occurred in an array and * returns a map with the element as key and the count as value.

* * @see * https://docs.python.org/dev/library/collections.html#collections.Counter * * @since 1.0 */ final class Counter { /** * Counts how many times each element provided occurred in an array and * returns a map with the element as key and the count as value. * * @param tokens array of tokens. * @return a map, where the elements are key, and the count the value. */ public static Map of(final CharSequence[] tokens) { final Map map = new HashMap<>(); Stream.of(tokens).forEach(token -> map.compute(token, (k, v) -> v != null ? v + 1 : 1)); return map; } /** * Hidden constructor. */ private Counter() { } }




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