100 lines
3.0 KiB
Java
100 lines
3.0 KiB
Java
/**
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*
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* Copyright 2015-2021 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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public class CollectionUtil {
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public static <T> Collection<T> requireNotEmpty(Collection<T> collection, String collectionName) {
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if (collection == null) {
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throw new NullPointerException(collectionName + " must not be null.");
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}
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if (collection.isEmpty()) {
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throw new IllegalArgumentException(collectionName + " must not be empty.");
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}
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return collection;
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}
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public static <T, C extends Collection<T>> List<T> removeUntil(C collection, Predicate<T> predicate) {
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List<T> removedElements = new ArrayList<>(collection.size());
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for (Iterator<T> it = collection.iterator(); it.hasNext();) {
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T t = it.next();
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if (predicate.test(t)) {
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break;
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}
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removedElements.add(t);
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it.remove();
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}
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return removedElements;
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}
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public interface Predicate<T> {
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boolean test(T t);
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}
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public static <T> ArrayList<T> newListWith(Collection<? extends T> collection) {
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if (collection == null) {
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return null;
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}
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return new ArrayList<>(collection);
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}
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public static <T> List<T> cloneAndSeal(Collection<? extends T> collection) {
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if (collection == null) {
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return Collections.emptyList();
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}
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ArrayList<T> clone = newListWith(collection);
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return Collections.unmodifiableList(clone);
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}
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public static <K, V> Map<K, V> cloneAndSeal(Map<K, V> map) {
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Map<K, V> clone = new HashMap<>(map);
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return Collections.unmodifiableMap(clone);
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}
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public static <T> Set<T> newSetWith(Collection<? extends T> collection) {
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if (collection == null) {
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return null;
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}
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return new HashSet<>(collection);
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}
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public static <T> List<T> emptyOrSingletonListFrom(T element) {
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if (element == null) {
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return Collections.emptyList();
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}
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return Collections.singletonList(element);
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}
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public static <T> Set<T> nullSafeUnmodifiableSet(Set<T> set) {
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if (set == null) {
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return Collections.emptySet();
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}
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return Collections.unmodifiableSet(set);
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}
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}
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