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	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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 org.apache.commons.collections4.set;

	import java.util.Comparator;
	import java.util.SortedSet;

	import org.apache.commons.collections4.Predicate;

	/**
	* Decorates another <code>SortedSet</code> to validate that all additions
	* match a specified predicate.
	* <p>
	* This set exists to provide validation for the decorated set.
	* It is normally created to decorate an empty set.
	* If an object cannot be added to the set, an IllegalArgumentException is thrown.
	* </p>
	* <p>
	* One usage would be to ensure that no null entries are added to the set.
	* </p>
	* <pre>
	* SortedSet set =
	* PredicatedSortedSet.predicatedSortedSet(new TreeSet(),
	* NotNullPredicate.notNullPredicate());
	* </pre>
	* <p>
	* This class is Serializable from Commons Collections 3.1.
	* </p>
	*
	* @param <E> the type of the elements in this set
	* @since 3.0
	*/
	public class PredicatedSortedSet<E> extends PredicatedSet<E> implements SortedSet<E> {

	/** Serialization version */
	private static final long serialVersionUID = -9110948148132275052L;

	/**
	* Factory method to create a predicated (validating) sorted set.
	* <p>
	* If there are any elements already in the set being decorated, they
	* are validated.
	*
	* @param <E> the element type
	* @param set the set to decorate, must not be null
	* @param predicate the predicate to use for validation, must not be null
	* @return a new predicated sorted set.
	* @throws NullPointerException if set or predicate is null
	* @throws IllegalArgumentException if the set contains invalid elements
	* @since 4.0
	*/
	public static <E> PredicatedSortedSet<E> predicatedSortedSet(final SortedSet<E> set,
	final Predicate<? super E> predicate) {
	return new PredicatedSortedSet<>(set, predicate);
	}

	//-----------------------------------------------------------------------
	/**
	* Constructor that wraps (not copies).
	* <p>
	* If there are any elements already in the set being decorated, they
	* are validated.
	*
	* @param set the set to decorate, must not be null
	* @param predicate the predicate to use for validation, must not be null
	* @throws NullPointerException if set or predicate is null
	* @throws IllegalArgumentException if the set contains invalid elements
	*/
	protected PredicatedSortedSet(final SortedSet<E> set, final Predicate<? super E> predicate) {
	super(set, predicate);
	}

	/**
	* Gets the sorted set being decorated.
	*
	* @return the decorated sorted set
	*/
	@Override
	protected SortedSet<E> decorated() {
	return (SortedSet<E>) super.decorated();
	}

	//-----------------------------------------------------------------------
	@Override
	public Comparator<? super E> comparator() {
	return decorated().comparator();
	}

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

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

	@Override
	public SortedSet<E> subSet(final E fromElement, final E toElement) {
	final SortedSet<E> sub = decorated().subSet(fromElement, toElement);
	return new PredicatedSortedSet<>(sub, predicate);
	}

	@Override
	public SortedSet<E> headSet(final E toElement) {
	final SortedSet<E> head = decorated().headSet(toElement);
	return new PredicatedSortedSet<>(head, predicate);
	}

	@Override
	public SortedSet<E> tailSet(final E fromElement) {
	final SortedSet<E> tail = decorated().tailSet(fromElement);
	return new PredicatedSortedSet<>(tail, predicate);
	}

	}

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