55 lines
1.7 KiB
Java
55 lines
1.7 KiB
Java
/*-
|
|
* ~~~~~~licensing~~~~~~
|
|
* test-producers
|
|
* ==========
|
|
* Copyright (C) 2020 - 2022 EmDev LLC
|
|
* ==========
|
|
* 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.
|
|
* ~~~~~~/licensing~~~~~~
|
|
*/
|
|
package ru.entaxy.platform.base.support;
|
|
|
|
import java.util.LinkedList;
|
|
import java.util.List;
|
|
import java.util.stream.Collectors;
|
|
|
|
public class DependencySorter {
|
|
|
|
public static interface DependencyProvider<T> {
|
|
List<T> getDependencies(T inspectedObject);
|
|
}
|
|
|
|
public static <T> List<T> getSortedList(List<T> origin, DependencyProvider<T> provider) throws Exception {
|
|
List<T> result = new LinkedList<>();
|
|
|
|
// add independent objects
|
|
result.addAll(
|
|
origin.stream().filter(obj -> provider.getDependencies(obj).isEmpty())
|
|
.collect(Collectors.toList())
|
|
);
|
|
|
|
while (result.size() < origin.size()) {
|
|
List<T> nextObjects = origin.stream().filter(obj->!result.contains(obj))
|
|
.filter(obj->result.containsAll(provider.getDependencies(obj)))
|
|
.collect(Collectors.toList());
|
|
if (nextObjects.isEmpty())
|
|
// TODO create more informative exception
|
|
throw new Exception("Contains unsatisfied dependencies");
|
|
result.addAll(nextObjects);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
}
|