com.google.common.collect.SingletonImmutableList Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* Copyright (C) 2009 The Guava Authors
*
* 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 com.google.common.collect;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Preconditions;
import java.util.Collections;
import java.util.Spliterator;
/**
* Implementation of {@link ImmutableList} with exactly one element.
*
* @author Hayward Chan
*/
@GwtCompatible(serializable = true, emulated = true)
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
@ElementTypesAreNonnullByDefault
final class SingletonImmutableList extends ImmutableList {
final transient E element;
SingletonImmutableList(E element) {
this.element = checkNotNull(element);
}
@Override
public E get(int index) {
Preconditions.checkElementIndex(index, 1);
return element;
}
@Override
public UnmodifiableIterator iterator() {
return Iterators.singletonIterator(element);
}
@Override
public Spliterator spliterator() {
return Collections.singleton(element).spliterator();
}
@Override
public int size() {
return 1;
}
@Override
public ImmutableList subList(int fromIndex, int toIndex) {
Preconditions.checkPositionIndexes(fromIndex, toIndex, 1);
return (fromIndex == toIndex) ? ImmutableList.of() : this;
}
@Override
public String toString() {
return '[' + element.toString() + ']';
}
@Override
boolean isPartialView() {
return false;
}
}