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package org.javimmutable.collections;

import javax.annotation.Nonnull;

/**
 * Interface for collections that contain a head value and a tail containing the remainder of the sequence.
 *
 * @param 
 */
public interface Sequence
{
    /**
     * Determines if this is the end of the Sequence.  When try the Sequence is empty and
     * getHead() cannot be called.  getTail() can still be called but will always return
     * an empty Sequence once isEmpty() returns true.
     *
     * @return
     */
    boolean isEmpty();

    /**
     * Accesses the first value in the Sequence.
     *
     * @return
     */
    T getHead();

    /**
     * Accesses the rest of the Sequence.
     *
     * @return
     */
    @Nonnull
    Sequence getTail();
}