/*
 *  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.collections.set;

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

import org.apache.commons.collections.Predicate;

Decorates another SortedSet to validate that all additions
match a specified predicate.

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.

One usage would be to ensure that no null entries are added to the set.
SortedSet set = PredicatedSortedSet.decorate(new TreeSet(), NotNullPredicate.INSTANCE);

This class is Serializable from Commons Collections 3.1.
Author:
Stephen Colebourne, Paul Jack
Since:
Commons Collections 3.0
Version:
$Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $/**
 * 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>
 * One usage would be to ensure that no null entries are added to the set.
 * <pre>SortedSet set = PredicatedSortedSet.decorate(new TreeSet(), NotNullPredicate.INSTANCE);</pre>
 * <p>
 * This class is Serializable from Commons Collections 3.1.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $
 * 
 * @author Stephen Colebourne
 * @author Paul Jack
 */
public class PredicatedSortedSet extends PredicatedSet implements SortedSet {

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

    
Factory method to create a predicated (validating) sorted set.

If there are any elements already in the set being decorated, they
are validated.
Params:
set –  the set to decorate, must not be null
predicate –  the predicate to use for validation, must not be null
Throws:
IllegalArgumentException – if set or predicate is null
IllegalArgumentException – if the set contains invalid elements/**
     * 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 set  the set to decorate, must not be null
     * @param predicate  the predicate to use for validation, must not be null
     * @throws IllegalArgumentException if set or predicate is null
     * @throws IllegalArgumentException if the set contains invalid elements
     */
    public static SortedSet decorate(SortedSet set, Predicate predicate) {
        return new PredicatedSortedSet(set, predicate);
    }

    //-----------------------------------------------------------------------
    
Constructor that wraps (not copies).

If there are any elements already in the set being decorated, they
are validated.
Params:
set –  the set to decorate, must not be null
predicate –  the predicate to use for validation, must not be null
Throws:
IllegalArgumentException – if set or predicate is null
IllegalArgumentException – if the set contains invalid elements/**
     * 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 IllegalArgumentException if set or predicate is null
     * @throws IllegalArgumentException if the set contains invalid elements
     */
    protected PredicatedSortedSet(SortedSet set, Predicate predicate) {
        super(set, predicate);
    }

    
Gets the sorted set being decorated.
Returns:
the decorated sorted set/**
     * Gets the sorted set being decorated.
     * 
     * @return the decorated sorted set
     */
    private SortedSet getSortedSet() {
        return (SortedSet) getCollection();
    }

    //-----------------------------------------------------------------------
    public SortedSet subSet(Object fromElement, Object toElement) {
        SortedSet sub = getSortedSet().subSet(fromElement, toElement);
        return new PredicatedSortedSet(sub, predicate);
    }

    public SortedSet headSet(Object toElement) {
        SortedSet sub = getSortedSet().headSet(toElement);
        return new PredicatedSortedSet(sub, predicate);
    }

    public SortedSet tailSet(Object fromElement) {
        SortedSet sub = getSortedSet().tailSet(fromElement);
        return new PredicatedSortedSet(sub, predicate);
    }

    public Object first() {
        return getSortedSet().first();
    }

    public Object last() {
        return getSortedSet().last();
    }

    public Comparator comparator() {
        return getSortedSet().comparator();
    }

}