/*
 * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
 * Copyright (C) 2012 - Javolution (http://javolution.org/)
 * All rights reserved.
 * 
 * Permission to use, copy, modify, and distribute this software is
 * freely granted, provided that this notice is preserved.
 */
package javolution.util.internal.set.sorted;

import javolution.util.internal.set.UnmodifiableSetImpl;
import javolution.util.service.SetService;
import javolution.util.service.SortedSetService;

/**
 * An unmodifiable view over a set.
 */
public class UnmodifiableSortedSetImpl<E> extends UnmodifiableSetImpl<E>
        implements SortedSetService<E> {

    private static final long serialVersionUID = 0x600L; // Version.

    public UnmodifiableSortedSetImpl(SetService<E> target) {
        super(target);
    }

    @Override
    public E first() {
        return target().first();
    }

    @Override
    public SortedSetService<E> headSet(E toElement) {
        return new SubSortedSetImpl<E>(this, null, toElement);
    }

    @Override
    public E last() {
        return target().last();
    }

    @SuppressWarnings("unchecked")
    @Override
    public SortedSetService<E>[] split(int n, boolean updateable) {
        SortedSetService<E>[] subTargets = target().split(n, updateable);
        SortedSetService<E>[] result = new SortedSetService[subTargets.length];
        for (int i = 0; i < subTargets.length; i++) {
            result[i] = new UnmodifiableSortedSetImpl<E>(subTargets[i]);
        }
        return result;
    }

    @Override
    public SortedSetService<E> subSet(E fromElement, E toElement) {
        return new SubSortedSetImpl<E>(this, fromElement, toElement);
    }

    @Override
    public SortedSetService<E> tailSet(E fromElement) {
        return new SubSortedSetImpl<E>(this, fromElement, null);
    }
    
    @Override
    protected SortedSetService<E> target() {
        return (SortedSetService<E>) super.target();
    }
}