1 | using System.Xml;
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2 | using System.Collections.Generic;
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3 | using System;
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4 | using System.Collections;
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5 | using System.IO;
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6 | using HeuristicLab.Persistence.Interfaces;
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7 |
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8 | namespace HeuristicLab.Persistence {
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9 |
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10 |
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11 | public class XmlParser : IEnumerable<ISerializationToken> {
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12 |
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13 | private readonly XmlReader reader;
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14 | private delegate IEnumerator<ISerializationToken> Handler();
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15 | private readonly Dictionary<string, Handler> handlers;
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16 |
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17 | public XmlParser(TextReader input) {
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18 | XmlReaderSettings settings = new XmlReaderSettings {
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19 | ConformanceLevel = ConformanceLevel.Document,
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20 | IgnoreWhitespace = true,
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21 | IgnoreComments = true
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22 | };
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23 | reader = XmlReader.Create(input, settings);
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24 | handlers = new Dictionary<string, Handler> {
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25 | {"PRIMITIVE", ParsePrimitive},
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26 | {"COMPOSITE", ParseComposite},
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27 | {"REFERENCE", ParseReference},
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28 | {"NULL", ParseNull}
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29 | };
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30 | }
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31 | public IEnumerator<ISerializationToken> GetEnumerator() {
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32 | while (reader.Read()) {
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33 | if (!reader.IsStartElement()) {
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34 | break;
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35 | }
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36 | IEnumerator<ISerializationToken> iterator;
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37 | try {
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38 | iterator = handlers[reader.Name].Invoke();
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39 | }
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40 | catch (KeyNotFoundException) {
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41 | throw new InvalidOperationException(String.Format(
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42 | "No handler for XML tag \"{0}\" installed",
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43 | reader.Name));
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44 | }
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45 | while (iterator.MoveNext()) {
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46 | yield return iterator.Current;
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47 | }
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48 | }
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49 | }
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50 | private IEnumerator<ISerializationToken> ParsePrimitive() {
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51 | int? id = null;
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52 | string idString = reader.GetAttribute("id");
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53 | if (idString != null)
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54 | id = int.Parse(idString);
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55 | yield return new PrimitiveToken(
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56 | reader.GetAttribute("name"),
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57 | int.Parse(reader.GetAttribute("typeId")),
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58 | reader.ReadString(),
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59 | id);
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60 | }
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61 | private IEnumerator<ISerializationToken> ParseComposite() {
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62 | string name = reader.GetAttribute("name");
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63 | string idString = reader.GetAttribute("id");
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64 | int? id = null;
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65 | int? typeId = null;
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66 | if (idString != null)
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67 | id = int.Parse(idString);
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68 | typeId = int.Parse(reader.GetAttribute("typeId"));
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69 | yield return new BeginToken(name, typeId, id);
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70 | IEnumerator<ISerializationToken> iterator = GetEnumerator();
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71 | while (iterator.MoveNext())
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72 | yield return iterator.Current;
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73 | yield return new EndToken(name, typeId, id);
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74 | }
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75 | private IEnumerator<ISerializationToken> ParseReference() {
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76 | yield return new ReferenceToken(
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77 | reader.GetAttribute("name"),
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78 | int.Parse(reader.GetAttribute("ref")));
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79 | }
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80 | private IEnumerator<ISerializationToken> ParseNull() {
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81 | yield return new NullReferenceToken(reader.GetAttribute("name"));
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82 | }
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83 | IEnumerator IEnumerable.GetEnumerator() {
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84 | return GetEnumerator();
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85 | }
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86 | public static Dictionary<string, int> ParseTypeCache(TextReader reader) {
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87 | Dictionary<string, int> typeCache = new Dictionary<string, int>();
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88 | XmlReader xmlReader = XmlReader.Create(reader);
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89 | while ( xmlReader.Read() ) {
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90 | if (xmlReader.Name == "TYPE") {
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91 | typeCache.Add(xmlReader.GetAttribute("name")
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92 | , int.Parse(xmlReader.GetAttribute("id")));
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93 | }
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94 | }
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95 | return typeCache;
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96 | }
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97 | }
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98 | }
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