iframe-proxy | Sunbelt Computer Software

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﻿using System;
using System.Security.Permissions;
namespace ReClassNET.Nodes
	public abstract class BaseWrapperNode : BaseNode
		/// <summary>Gets or sets the inner node.</summary>
		public BaseNode InnerNode { get; protected set; }
		/// <summary>Gets signaled if the inner node was changed.</summary>
		public event NodeEventHandler InnerNodeChanged;
		/// <summary>True to perform class cycle checks when changing the inner node.</summary>
		protected abstract bool PerformCycleCheck { get; }
		/// <summary>
		/// Should be called before <see cref="ChangeInnerNode"/> to test if the node can handle the inner node type.
		/// </summary>
		/// <param name="node">The new inner node type.</param>
		/// <returns>True if the class can handle the inner node type or false otherwise.</returns>
		public abstract bool CanChangeInnerNodeTo(BaseNode node);
		/// <summary>Changes the inner node.</summary>
		/// <param name="node">The new node.</param>
		public void ChangeInnerNode(BaseNode node)
			if (!CanChangeInnerNodeTo(node))
				throw new InvalidOperationException($"Can't change inner node to '{node?.GetType().ToString() ?? "null"}'");
			if (InnerNode != node)
				InnerNode = node;
				if (node != null)
					node.ParentNode = this;
				InnerNodeChanged?.Invoke(this);
				GetParentContainer()?.ChildHasChanged(this);
		/// <summary>
		/// Resolve the most inner node of a <see cref="BaseWrapperNode"/> chain.
		/// </summary>
		/// <returns>The most inner node or null.</returns>
		public BaseNode ResolveMostInnerNode()
			if (InnerNode == null)
				return null;
			if (InnerNode is BaseWrapperNode baseWrapperNode)
				return baseWrapperNode.ResolveMostInnerNode();
			return InnerNode;
		/// <summary>
		/// Tests if the cycle check is really needed in a <see cref="BaseWrapperNode"/> chain.
		/// </summary>
		/// <returns></returns>
		public bool ShouldPerformCycleCheckForInnerNode()
			// TODO Should there be a "is ClassNode" for the last inner node?
			if (!PerformCycleCheck)
				return false;
			var wrapperNode = this;
			while (wrapperNode.InnerNode is BaseWrapperNode wrappedNode)
				if (!wrappedNode.PerformCycleCheck)
					return false;
				wrapperNode = wrappedNode;
			return true;
		/// <summary>
		/// Tests if the given node type is present in the chain of wrapped nodes.
		/// </summary>
		/// <typeparam name="TNode">The node type to check.</typeparam>
		/// <returns>True if the given node type is present in the chain of wrapped nodes, false otherwise.</returns>
		public bool IsNodePresentInChain<TNode>() where TNode : BaseNode
			BaseNode node = this;
			while (node is BaseWrapperNode wrapperNode)
				if (node is TNode)
					return true;
				node = wrapperNode.InnerNode;
			return false;

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