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Lists.java
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105 lines (96 loc) · 3.36 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.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* Utility methods related to {@code java.util.List}s.
*
* @author Yvonne Wang
* @author Alex Ruiz
* @author Joel Costigliola
*/
public final class Lists {
/**
* Creates a <em>mutable</em> {@link ArrayList} containing the given elements.
*
* @param <T> the generic type of the {@code ArrayList} to create.
* @param elements the elements to store in the {@code ArrayList}.
* @return the created {@code ArrayList}, of {@code null} if the given array of elements is {@code null}.
*/
@SafeVarargs
public static <T> ArrayList<T> newArrayList(T... elements) {
if (elements == null) {
return null;
}
ArrayList<T> list = newArrayList();
Collections.addAll(list, elements);
return list;
}
@SafeVarargs
public static <T> List<T> list(T... elements) {
if (elements == null) {
return null;
}
ArrayList<T> list = newArrayList();
Collections.addAll(list, elements);
return list;
}
/**
* Creates a <em>mutable</em> {@link ArrayList} containing the given elements.
*
* @param <T> the generic type of the {@code ArrayList} to create.
* @param elements the elements to store in the {@code ArrayList}.
* @return the created {@code ArrayList}, or {@code null} if the given {@code Iterable} is {@code null}.
*/
public static <T> ArrayList<T> newArrayList(Iterable<? extends T> elements) {
if (elements == null) {
return null;
}
return Streams.stream(elements).collect(toCollection(ArrayList::new));
}
/**
* Creates a <em>mutable</em> {@link ArrayList} containing the given elements.
*
* @param <T> the generic type of the {@code ArrayList} to create.
* @param elements the elements to store in the {@code ArrayList}.
* @return the created {@code ArrayList}, or {@code null} if the given {@code Iterator} is {@code null}.
*/
public static <T> ArrayList<T> newArrayList(Iterator<? extends T> elements) {
if (elements == null) {
return null;
}
return Streams.stream(elements).collect(toCollection(ArrayList::new));
}
/**
* Creates a <em>mutable</em> {@link ArrayList}.
*
* @param <T> the generic type of the {@code ArrayList} to create.
* @return the created {@code ArrayList}, of {@code null} if the given array of elements is {@code null}.
*/
public static <T> ArrayList<T> newArrayList() {
return new ArrayList<>();
}
/**
* @param <T> the generic type of the {@code List}.
* @return an empty, <em>immutable</em> {@code List}.
*/
public static <T> List<T> emptyList() {
return Collections.emptyList();
}
private Lists() {
}
}