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ImmutableSingletonList.java
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/
ImmutableSingletonList.java
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/*
* Copyright (c) 2016 Goldman Sachs.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v. 1.0 which accompany this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package org.eclipse.collections.impl.list.immutable;
import java.io.Serializable;
import java.util.RandomAccess;
import org.eclipse.collections.api.block.procedure.Procedure;
import org.eclipse.collections.api.list.ImmutableList;
import org.eclipse.collections.impl.block.factory.Comparators;
import org.eclipse.collections.impl.factory.Lists;
/**
* This is a single element immutable List which is created by calling
* Immutable.newListWith(one) method.
*/
final class ImmutableSingletonList<T>
extends AbstractImmutableList<T>
implements Serializable, RandomAccess
{
private static final long serialVersionUID = 1L;
private final T element1;
ImmutableSingletonList(T obj1)
{
this.element1 = obj1;
}
@Override
public int size()
{
return 1;
}
@Override
public boolean contains(Object obj)
{
return Comparators.nullSafeEquals(obj, this.element1);
}
@Override
public void each(Procedure<? super T> procedure)
{
procedure.value(this.element1);
}
@Override
public T get(int index)
{
if (index == 0)
{
return this.element1;
}
throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + this.size());
}
@Override
public T getFirst()
{
return this.element1;
}
@Override
public T getLast()
{
return this.element1;
}
@Override
public T getOnly()
{
return this.element1;
}
@Override
public ImmutableList<T> toReversed()
{
return this;
}
@Override
public ImmutableList<T> newWith(T newItem)
{
return Lists.immutable.with(this.element1, newItem);
}
}