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using System;
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using System.Collections.Generic;
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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.Linq;
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using System.Text;
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using static Trace<ConfigurationContext>;
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public class ConfigurationContext {
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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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LinkedListNode<string> m_insertAt;
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public ConfigurationContext() {
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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 Type Resolve(TypeReference reference) {
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Safe.ArgumentNotNull(reference, nameof(reference));
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var args = reference.IsGeneric && !reference.IsOpenGeneric ? reference.GenericParameters?.Select(Resolve).ToArray() : null;
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var argc = reference.IsGeneric ? reference.GenericParameters.Length : 0;
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foreach (var ns in m_namespases) {
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var typeName = FormatName(new [] { ns, reference.Namespace, reference.TypeName}, argc, args, reference.IsArray);
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var resolved = Type.GetType(typeName, false);
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if (resolved != null) {
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Log("Probe succeed {0} in '{1}': {2} -> {3}", reference, ns, typeName, resolved.FullName);
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return resolved;
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} else {
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Log("Probe failed {0} in '{1}': {2}", reference, ns, typeName);
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}
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}
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throw new Exception($"Failed to resolve: {reference}");
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}
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string FormatName(string[] parts, int argc, Type[] args, bool isArray) {
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var builder = new StringBuilder();
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builder.Append(String.Join(".", parts.Where(x => !string.IsNullOrEmpty(x))));
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if (argc > 0) {
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builder.Append('`');
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builder.Append(argc);
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}
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if (args!= null && args.Length > 0) {
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builder.Append('[');
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builder.Append(string.Join(",", args.Select(x => x.FullName)));
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builder.Append(']');
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}
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if(isArray)
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builder.Append("[]");
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return builder.ToString();
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}
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public Type Resolve(string typeReference) {
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return Resolve(TypeReference.Parse(typeReference));
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}
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public void Register(ServiceElement descriptor) {
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}
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}
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}
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