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/*-
 * ========================LICENSE_START=================================
 * TeamApps
 * ---
 * Copyright (C) 2014 - 2024 TeamApps.org
 * ---
 * Licensed 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.
 * =========================LICENSE_END==================================
 */
package org.teamapps.util;

import java.util.LinkedHashMap;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collector;
import java.util.stream.Collectors;

public class StreamUtil {

	public static  Collector> toLinkedHashMap(Function keyMapper, Function valueMapper) {
		return Collectors.toMap(keyMapper, valueMapper,
				(u, v) -> v,
				LinkedHashMap::new
		);
	}

	public static  Predicate distinctByKey(Function keyExtractor) {
		Set seen = ConcurrentHashMap.newKeySet();
		return t -> seen.add(keyExtractor.apply(t));
	}

}