com.expediagroup.rhapsody.util.Collecting Maven / Gradle / Ivy
/**
* Copyright 2019 Expedia, Inc.
*
* 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.
*/
package com.expediagroup.rhapsody.util;
import java.util.Arrays;
import java.util.Map;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collectors;
public final class Collecting {
private Collecting() {
}
public static > Map toMap(T[] array,
Function keyMapper,
Function valueMapper,
Supplier mapSupplier) {
return Arrays.stream(array).collect(Collectors.toMap(keyMapper, valueMapper, throwingMerger(), mapSupplier));
}
public static BinaryOperator throwingMerger() {
return (t1, t2) -> {
throw new IllegalStateException(String.format("Duplicate key for values: t1=%s t2=%s", t1, t2));
};
}
}