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Sets.java
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108 lines (99 loc) · 3.37 KB
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/*
* 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.
*
* Copyright 2012-2020 the original author or authors.
*/
package org.assertj.core.util;
import static java.util.stream.Collectors.toCollection;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.TreeSet;
/**
* Utility methods related to {@link Set}s.
*
* @author alruiz
*/
public final class Sets {
/**
* Creates a <em>mutable</em> {@code HashSet}.
*
* @param <T> the generic type of the {@code HashSet} to create.
* @return the created {@code HashSet}.
*/
public static <T> HashSet<T> newHashSet() {
return new HashSet<>();
}
/**
* Creates a <em>mutable</em> {@code HashSet} containing the given elements.
*
* @param <T> the generic type of the {@code HashSet} to create.
* @param elements the elements to store in the {@code HashSet}.
* @return the created {@code HashSet}, or {@code null} if the given array of elements is {@code null}.
*/
public static <T> HashSet<T> newHashSet(Iterable<? extends T> elements) {
if (elements == null) {
return null;
}
return Streams.stream(elements).collect(toCollection(HashSet::new));
}
/**
* Creates a <em>mutable</em> {@code LinkedHashSet}.
*
* @param <T> the generic type of the {@code LinkedHashSet} to create.
* @return the created {@code LinkedHashSet}.
*/
public static <T> LinkedHashSet<T> newLinkedHashSet() {
return new LinkedHashSet<>();
}
/**
* Creates a <em>mutable</em> {@link LinkedHashSet} containing the given elements.
*
* @param <T> the generic type of the {@code LinkedHashSet} to create.
* @param elements the elements to store in the {@code LinkedHashSet}.
* @return the created {@code LinkedHashSet}, or {@code null} if the given array of elements is {@code null}.
*/
@SafeVarargs
public static <T> LinkedHashSet<T> newLinkedHashSet(T... elements) {
if (elements == null) {
return null;
}
LinkedHashSet<T> set = newLinkedHashSet();
java.util.Collections.addAll(set, elements);
return set;
}
/**
* Creates a <em>mutable</em> {@link TreeSet}.
*
* @param <T> the generic type of the {@link TreeSet} to create.
* @return the created {@link TreeSet}.
*/
public static <T> TreeSet<T> newTreeSet() {
return new TreeSet<>();
}
/**
* Creates a <em>mutable</em> {@link TreeSet} containing the given elements.
*
* @param <T> the generic type of the {@link TreeSet} to create.
* @param elements the elements to store in the {@link TreeSet}.
* @return the created {@link TreeSet}, or {@code null} if the given array of elements is {@code null}.
*/
@SafeVarargs
public static <T> TreeSet<T> newTreeSet(T... elements) {
if (elements == null) {
return null;
}
TreeSet<T> set = newTreeSet();
java.util.Collections.addAll(set, elements);
return set;
}
private Sets() {
}
}