de.mklinger.qetcher.client.lists.Lists Maven / Gradle / Ivy
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Qetcher Java client, OSGi bundle, minimal dependencies
/*
* Copyright mklinger GmbH - https://www.mklinger.de
*
* 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.
*/
package de.mklinger.micro.lists;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Utility class for Lists.
*
* @author Marc Klinger - mklinger[at]mklinger[dot]de
*/
public class Lists {
/** No instantiation */
private Lists() {}
/**
* Create a new immutable list with the contents of the given List.
*
* @param original The original list
* @return A new, immutable list containing all elements of the given list
*/
public static List newImmutableList(final List original) {
if (original == null || original.isEmpty()) {
return Collections.emptyList();
}
if (original.size() == 1) {
return Collections.singletonList(original.get(0));
}
return Collections.unmodifiableList(new ArrayList<>(original));
}
}
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