package
{
	/*@Author - Gaurav Pandey (gaurav@caa.columbia.edu)
	@Description - Part of a Flex-Collection API*/
	
	import flash.utils.Dictionary;
	
	import mx.collections.ArrayCollection;
	
	/*Hybrid Version of Set and Dictionary as it does not allow duplicates but saves data as key, value pair*/
	public dynamic final class MyDictionary extends Dictionary
	{		
		public function MyDictionary(weakKeys:Boolean=false)
		{
			super(weakKeys);
		}
		
		public function insertKey(key : Object, value : Object) : void	
		{
			if(this == null)
				throw new ReferenceError("Object instance is null");
			if(!(this is MyDictionary))
				throw new MDIllegalObjectException("Object referenced is not a MyDictionary");
			if(key == null)
				throw new ArgumentError("Key is Nothing");
			/*Debatable whether value assigned to a key can be kept as null or not*/
			/*if(value == null)
				throw new ArgumentError("Value is Nothing");*/
			if(this[key] != null)
				throw new ArgumentError("Key already exists");

			this[key] = value;
		}
		
		public function getSize() : int
		{
			if(this == null)
				throw new ReferenceError("Object instance is null");
			if(!(this is MyDictionary))
				throw new MDIllegalObjectException("Object referenced is not a MyDictionary");

			var count : int = 0;
			for(var x : Object in this)
			{
				count++;	
			}
			return count;
		}
		
		public function removeKey(key : Object) : void
		{
			if(this == null)
				throw new ReferenceError("Object instance is null");
			if(!(this is MyDictionary))
				throw new MDIllegalObjectException("Object referenced is not a MyDictionary");
			if(key == null)
				throw new ArgumentError("Key is null");
			
			if(this[key] != null)
			{
				trace("Value does exist");
				var obj : Object = this[key];
				this[key] = null;
				delete this[key];
			}
			else
			{
				trace("Value does not exist");	
			}
		}
		
		public function clear() : void
		{
			if(this == null)
				throw new ReferenceError("Object instance is null");
			if(!(this is MyDictionary))
				throw new MDIllegalObjectException("Object referenced is not a MyDictionary")
			
			for(var x : Object in this)
			{
				this[x] = null;
				delete this[x];
			}
		}
		
		public function containsKey(key : Object) : Boolean
		{
			if(this == null)
				throw new ReferenceError("Object instance is null");
			if(!(this is MyDictionary))
				throw new MDIllegalObjectException("Object referenced is not a MyDictionary");
			if(key == null)
				throw new ArgumentError("Key passed is null");
			
			if(this[key] != null)
				return true;
			return false;
		}
		
		public function containsValue(value : Object) : Boolean
		{
			if(this == null)
				throw new ReferenceError("Object instance is null");
			if(!(this is MyDictionary))
				throw new MDIllegalObjectException("Object referenced is not a MyDictionary");
			if(value == null)
				throw new ArgumentError("Value passed is null");
				
			for(var x : Object in this)
			{
				if(this[x] != null)
				{
					if(this[x] == value)
						return true;
				}
			}
			return false;
		}
		
		public function toString() : String
		{
			if(this == null)
				throw new ReferenceError("Object instance is null");
			if(!(this is MyDictionary))
				throw new MDIllegalObjectException("Object referenced is not a MyDictionary");
				
			var sb : String = "";

			for(var x : Object in this)
			{
				if(this[x] != null)
				{
					sb += "key: " + x + " value: " + this[x] + "\n";
				}
			}
			
			return sb;
		}
		
		public function getKeys() : Array
		{
			if(this == null)
				throw new ReferenceError("Object instance is null");
			if(!(this is MyDictionary))
				throw new MDIllegalObjectException("Object referenced is not a MyDictionary");
				
			var arrC : ArrayCollection = new ArrayCollection();
			
			for(var x : Object in this)
			{
				arrC.addItem(x);
			}
			return arrC.toArray().sort();
		}
		
		public function getValues() : Array
		{
			if(this == null)
				throw new ReferenceError("Object instance is null");
			if(!(this is MyDictionary))
				throw new MDIllegalObjectException("Object referenced is not a MyDictionary");
				
			var arrC : ArrayCollection = new ArrayCollection();
			
			for(var x : Object in this)
			{
				if(this[x] != null)
					arrC.addItem(x);
			}
			return arrC.toArray().sort();
		}
	}
}