#region license
//
// (C) db4objects Inc. http://www.db4o.com
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#endregion

using System;
using Mono.Cecil.Cil;

using Mono.Collections.Generic;

namespace Cecil.FlowAnalysis.ActionFlow
{
	/// <summary>
	/// </summary>
	public abstract class ActionBlock {

		Collection<ActionBlock> _predecessors = new Collection<ActionBlock> ();
		Instruction _sourceInstruction;

		public Instruction SourceInstruction {
			get { return _sourceInstruction; }
		}

		public virtual Collection<ActionBlock> Predecessors {
			get { return _predecessors; }
		}

		public abstract ActionType ActionType {
			get;
		}

		public abstract ActionBlock [] Successors {
			get;
		}

		internal ActionBlock (Instruction sourceInstruction)
		{
			if (null == sourceInstruction) throw new ArgumentNullException ("sourceInstruction");
			_sourceInstruction = sourceInstruction;
		}

		protected void AddAsPredecessorOf (ActionBlock block)
		{
			block.Predecessors.Add (this);
		}

		internal void RemovePredecessor (ActionBlock block)
		{
			_predecessors.Remove (block);
		}

		internal abstract void ReplaceSuccessor (ActionBlock existing, ActionBlock newBlock);
	}
}
