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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using Implab.Diagnostics;
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namespace Implab.ServiceHost.Unity {
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using System.Diagnostics;
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using static Trace<TypeResolver>;
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public class TypeResolver {
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readonly Dictionary<string, Type> m_cache = new Dictionary<string, Type>();
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Regex _nsRx = new Regex(@"^\w+(\.\w+)*$", RegexOptions.Compiled);
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readonly LinkedList<string> m_namespases = new LinkedList<string>();
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internal Type Resolve(string ns, string typeName) {
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var fullName = string.IsNullOrEmpty(ns) ? typeName : $"{ns}.{typeName}";
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return ProbeInNamespaces(fullName);
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}
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public Type Resolve(TypeReference typeReference, bool throwOnFail) {
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var context = new TypeResolutionContext(this, throwOnFail);
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typeReference.Visit(context);
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return context.MakeType();
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}
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public Type Resolve(string typeSpec, bool throwOnFail) {
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Safe.ArgumentNotEmpty(typeSpec, nameof(typeSpec));
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var typeReference = TypeReference.Parse(typeSpec);
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return Resolve(typeReference, throwOnFail);
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}
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LinkedListNode<string> m_insertAt;
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readonly TypeResolver m_parent;
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public TypeResolver() : this(null) {
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}
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public TypeResolver(TypeResolver parent) {
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m_parent = parent;
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m_insertAt = new LinkedListNode<string>(string.Empty);
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m_namespases.AddFirst(m_insertAt);
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}
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public void AddNamespace(string ns) {
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Safe.ArgumentMatch(ns, nameof(ns), _nsRx);
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if (m_insertAt != null)
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m_namespases.AddAfter(m_insertAt, ns);
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else
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m_namespases.AddFirst(ns);
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}
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public void AddMapping(string typeName, Type type) {
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Safe.ArgumentNotEmpty(typeName, nameof(typeName));
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Safe.ArgumentNotNull(type, nameof(type));
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m_cache[typeName] = type;
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}
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Type ProbeInNamespaces(string localName) {
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Type resolved;
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if (!m_cache.TryGetValue(localName, out resolved)) {
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foreach (var ns in m_namespases) {
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var typeName = string.IsNullOrEmpty(ns) ? localName : $"{ns}.{localName}";
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resolved = Probe(typeName);
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if (resolved != null) {
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Log($"Probe '{localName}' -> '{resolved.FullName}'");
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break;
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}
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}
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if (resolved == null && m_parent != null)
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resolved = m_parent.ProbeInNamespaces(localName);
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if(resolved == null)
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Log($"Probe '{localName}' failed");
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m_cache[localName] = resolved;
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}
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return resolved;
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}
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Type Probe(string typeName) {
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var assemblies = AppDomain.CurrentDomain.GetAssemblies();
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foreach (var assembly in assemblies) {
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var type = assembly.GetType(typeName);
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if (type != null)
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return type;
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}
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return null;
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}
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}
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}
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