/*
 [The "BSD license"]
  Copyright (c) 2011 Terence Parr
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:

  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
  3. The name of the author may not be used to endorse or promote products
     derived from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.antlr.v4.runtime.misc;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;

/** A HashMap that remembers the order that the elements were added.
 *  You can alter the ith element with set(i,value) too :)  Unique list.
 *  I need the replace/set-element-i functionality so I'm subclassing
 *  LinkedHashSet.
 */
public class OrderedHashSet<T> extends LinkedHashSet<T> {
    /** Track the elements as they are added to the set */
    protected ArrayList<T> elements = new ArrayList<T>();

    public T get(int i) {
        return elements.get(i);
    }

    /** Replace an existing value with a new value; updates the element
     *  list and the hash table, but not the key as that has not changed.
     */
    public T set(int i, T value) {
        T oldElement = elements.get(i);
        elements.set(i,value); // update list
        super.remove(oldElement); // now update the set: remove/add
        super.add(value);
        return oldElement;
    }

	public boolean remove(int i) {
		T o = elements.remove(i);
        return super.remove(o);
	}

    /** Add a value to list; keep in hashtable for consistency also;
     *  Key is object itself.  Good for say asking if a certain string is in
     *  a list of strings.
     */
    @Override
    public boolean add(T value) {
        boolean result = super.add(value);
		if ( result ) {  // only track if new element not in set
			elements.add(value);
		}
		return result;
    }

	@Override
	public boolean remove(Object o) {
		throw new UnsupportedOperationException();
    }

	@Override
	public void clear() {
        elements.clear();
        super.clear();
    }

	@Override
	public int hashCode() {
		return elements.hashCode();
	}

	@Override
	public boolean equals(Object o) {
//		System.out.print("equals " + this + ", " + o+" = ");
		boolean same = elements!=null && elements.equals(((OrderedHashSet<?>)o).elements);
//		System.out.println(same);
		return same;
	}

	@Override
	public Iterator<T> iterator() {
		return elements.iterator();
	}

	/** Return the List holding list of table elements.  Note that you are
     *  NOT getting a copy so don't write to the list.
     */
    public List<T> elements() {
        return elements;
    }

    @Override
    public Object clone() {
        OrderedHashSet<T> dup = (OrderedHashSet<T>)super.clone();
        dup.elements = (ArrayList<T>)this.elements.clone();
        return dup;
    }

    @Override
	public Object[] toArray() {
		return elements.toArray();
	}

	@Override
	public String toString() {
        return elements.toString();
    }
}

@@ -3773,24 +3773,63 @@
 t clone() %7B%0A
+        @SuppressWarnings(%22unchecked%22)%0A
         Orde
@@ -3905,17 +3905,20 @@
 ments = 
-(
+new 
 ArrayLis
@@ -3921,17 +3921,17 @@
 yList%3CT%3E
-)
+(
 this.ele
@@ -3935,23 +3935,16 @@
 elements
-.clone(
 );%0A     

Fix unchecked warnings in clone()