Initial checkin

IronJava.Core/AST/JavaNode.cs

@@ -0,0 +1,62 @@
+using System.Collections.Generic;
+using IronJava.Core.AST.Visitors;
+
+namespace IronJava.Core.AST
+{
+    /// <summary>
+    /// Base class for all Java AST nodes.
+    /// </summary>
+    public abstract class JavaNode
+    {
+        /// <summary>
+        /// The location of this node in the source code.
+        /// </summary>
+        public SourceRange Location { get; }
+
+        /// <summary>
+        /// Parent node in the AST.
+        /// </summary>
+        public JavaNode? Parent { get; internal set; }
+
+        /// <summary>
+        /// Child nodes in the AST.
+        /// </summary>
+        public IReadOnlyList<JavaNode> Children => _children;
+        private readonly List<JavaNode> _children = new();
+
+        protected JavaNode(SourceRange location)
+        {
+            Location = location;
+        }
+
+        /// <summary>
+        /// Accept a visitor to traverse this node.
+        /// </summary>
+        public abstract T Accept<T>(IJavaVisitor<T> visitor);
+
+        /// <summary>
+        /// Accept a visitor to traverse this node without returning a value.
+        /// </summary>
+        public abstract void Accept(IJavaVisitor visitor);
+
+        /// <summary>
+        /// Add a child node.
+        /// </summary>
+        protected internal void AddChild(JavaNode child)
+        {
+            _children.Add(child);
+            child.Parent = this;
+        }
+
+        /// <summary>
+        /// Add multiple child nodes.
+        /// </summary>
+        protected internal void AddChildren(IEnumerable<JavaNode> children)
+        {
+            foreach (var child in children)
+            {
+                AddChild(child);
+            }
+        }
+    }
+}