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Library providing immutable/persistent collection classes for Java. While collections are immutable they provide methods for adding and removing values by creating new modified copies of themselves. Each copy shares almost all of its structure with other copies to minimize memory consumption.

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// Burton Computer Corporation
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package org.javimmutable.collections.sequence;

import org.javimmutable.collections.InsertableSequence;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;

@Immutable
public final class EmptySequenceNode
    implements InsertableSequence
{
    private static final InsertableSequence EMPTY = new EmptySequenceNode();

    private EmptySequenceNode()
    {
    }

    @SuppressWarnings("unchecked")
    public static  InsertableSequence of()
    {
        return EMPTY;
    }

    @Nonnull
    @Override
    public InsertableSequence insert(T value)
    {
        return FilledSequenceNode.of(value);
    }

    @Override
    public boolean isEmpty()
    {
        return true;
    }

    @Override
    public T getHead()
    {
        throw new UnsupportedOperationException();
    }

    @Nonnull
    @Override
    public InsertableSequence getTail()
    {
        throw new UnsupportedOperationException();
    }
}