spring-kafka AllowDenyCollectionManager 源码
spring-kafka AllowDenyCollectionManager 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/support/AllowDenyCollectionManager.java
/*
* Copyright 2018-2021 the original author or authors.
*
* 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
*
* https://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.springframework.kafka.support;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.function.Predicate;
import org.springframework.util.Assert;
/**
* Class for managing Allow / Deny collections and its predicates.
*
* @param <T> Collection generic type
* @author Tomaz Fernandes
* @since 28/12/20
*/
public final class AllowDenyCollectionManager<T> {
private final Collection<T> allowList;
private final Collection<T> denyList;
private final Collection<Predicate<T>> predicates;
public AllowDenyCollectionManager(Collection<T> allowList, Collection<T> denyList) {
this.allowList = allowList;
this.denyList = denyList;
this.predicates = Collections.singletonList(getDefaultPredicate(allowList, denyList));
}
public AllowDenyCollectionManager(Collection<T> allowList, Collection<T> denyList, Collection<Predicate<T>> predicates) {
Assert.notNull(allowList, () -> "AllowList cannot be null");
Assert.notNull(denyList, () -> "DenyList cannot be null");
Assert.notNull(predicates, () -> "Predicates cannot be null");
this.allowList = allowList;
this.denyList = denyList;
this.predicates = predicates;
}
public Predicate<T> getDefaultPredicate(Collection<T> allowList, Collection<T> denyList) {
return objectToCheck -> !denyList.contains(objectToCheck)
&& (allowList.isEmpty() || allowList.contains(objectToCheck));
}
public boolean isAllowed(T objectToCheck) {
return this.predicates
.stream()
.allMatch(predicate -> predicate.test(objectToCheck));
}
public boolean areAllowed(T[] objects) {
return Arrays.stream(objects)
.allMatch(this::isAllowed);
}
public static <T> AllowDenyCollectionManager<T> createManagerFor(Collection<T> allowList, Collection<T> denyList) {
return new AllowDenyCollectionManager<>(allowList, denyList);
}
public static <T> AllowDenyCollectionManager<T> createManagerFor(Collection<T> allowList, Collection<T> denyList, Collection<Predicate<T>> predicates) {
return new AllowDenyCollectionManager<>(allowList, denyList, predicates);
}
public boolean hasNoRestrictions() {
return this.allowList.isEmpty()
&& this.denyList.isEmpty();
}
}
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