001/**
002 * Copyright (C) 2006-2020 Talend Inc. - www.talend.com
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.talend.sdk.component.server.lang;
017
018import static java.util.stream.Collectors.toMap;
019import static lombok.AccessLevel.PRIVATE;
020
021import java.util.LinkedHashMap;
022import java.util.function.Function;
023import java.util.stream.Collector;
024
025import lombok.NoArgsConstructor;
026
027@NoArgsConstructor(access = PRIVATE)
028public final class CustomCollectors {
029
030    public static <T, K, V> Collector<T, ?, LinkedHashMap<K, V>> toLinkedMap(
031            final Function<? super T, ? extends K> keyMapper, final Function<? super T, ? extends V> valueMapper) {
032        return toMap(keyMapper, valueMapper, (v1, v2) -> {
033            throw new IllegalArgumentException("conflict on key " + v1);
034        }, LinkedHashMap::new);
035    }
036}