/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2014-2016 ForgeRock AS.
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*/
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package org.opends.server.util;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.LinkedHashSet;
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import java.util.LinkedList;
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import java.util.TreeSet;
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/**
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* Utility class for {@link Collection}s.
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*/
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public final class CollectionUtils
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{
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private CollectionUtils()
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{
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// private for utility classes
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}
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/**
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* Creates a new {@link ArrayList} with the provided elements.
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*
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* @param <E>
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* the elements' type
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* @param elements
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* the elements to add to the new ArrayList
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* @return a new ArrayList with the provided elements
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*/
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public static <E> ArrayList<E> newArrayList(E... elements)
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{
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return new ArrayList<>(Arrays.asList(elements));
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}
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/**
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* Creates a new {@link LinkedList} with the provided elements.
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*
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* @param <E>
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* the elements' type
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* @param elements
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* the elements to add to the new LinkedList
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* @return a new LinkedList with the provided elements
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*/
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public static <E> LinkedList<E> newLinkedList(E... elements)
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{
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return new LinkedList<>(Arrays.asList(elements));
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}
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/**
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* Creates a new {@link HashSet} with the provided elements.
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*
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* @param <E>
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* the elements' type
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* @param elements
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* the elements to add to the new HashSet
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* @return a new HashSet with the provided elements
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*/
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public static <E> HashSet<E> newHashSet(E... elements)
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{
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return new HashSet<>(Arrays.asList(elements));
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}
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/**
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* Creates a new {@link LinkedHashSet} with the provided elements.
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*
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* @param <E>
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* the elements' type
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* @param elements
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* the elements to add to the new LinkedHashSet
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* @return a new LinkedHashSet with the provided elements
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*/
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public static <E> LinkedHashSet<E> newLinkedHashSet(E... elements)
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{
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return new LinkedHashSet<>(Arrays.asList(elements));
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}
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/**
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* Creates a new {@link TreeSet} with the provided elements.
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*
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* @param <E>
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* the elements' type
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* @param elements
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* the elements to add to the new TreeSet
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* @return a new TreeSet with the provided elements
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*/
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public static <E> TreeSet<E> newTreeSet(E... elements)
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{
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return new TreeSet<>(Arrays.asList(elements));
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}
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/**
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* Collects all the elements from the provided iterable into the provided collection.
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*
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* @param <C>
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* The type of the collection
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* @param <E>
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* The type of the iterable's elements
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* @param iterable
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* the iterable from which to read elements
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* @param outputCollection
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* the collection where to add the iterable's elements
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* @return the provided collection
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*/
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public static <C extends Collection<E>, E> C collect(Iterable<E> iterable, C outputCollection)
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{
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for (E e : iterable)
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{
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outputCollection.add(e);
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}
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return outputCollection;
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}
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/**
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* Returns whether the provided iterable is empty, i.e. whether it has not elements.
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*
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* @param iterable
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* the iterable for which to omake the determination
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* @return {@code true} if the iterable is empty, {@code false} otherwise.
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*/
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public static boolean isEmpty(Iterable<?> iterable)
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{
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return !iterable.iterator().hasNext();
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}
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}
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