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annotate Lang/TranslationXmlLoader.cs @ 80:a23c07137fa4

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Re #32: Add staged loading of translations * Move from passing entire document to XmlTranslationSet to just passing XmlNodeList of translation nodes
author IBBoard <dev@ibboard.co.uk>
date Sat, 10 Apr 2010 19:05:26 +0000
parents a70d89de1435
children 90b9a3fe3c18
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1 // This file (TranslationXmlLoader.cs) is a part of the IBBoard project and is copyright 2010 IBBoard
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2 //
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3 // The file and the library/program it is in are licensed and distributed, without warranty, under the GNU Affero GPL license, either version 3 of the License or (at your option) any later version. Please see COPYING for more information and the full license.
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4
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5 using System;
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6 using System.IO;
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7 using System.Xml;
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8 using System.Xml.Schema;
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9 using System.Collections.Generic;
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10 using IBBoard.IO;
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11 using IBBoard.Xml;
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12
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13 namespace IBBoard.Lang
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14 {
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15 /// <summary>
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16 /// A simple loader of translations from XML files
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17 /// </summary>
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18 public class TranslationXmlLoader
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19 {
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20 private XmlReaderSettings settings;
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21 private string schemaLocation;
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22 private TranslationXmlExtractor extractor;
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23
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24 public TranslationXmlLoader(string schemaLocation)
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25 {
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26 this.schemaLocation = schemaLocation;
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27 extractor = new TranslationXmlExtractor();
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28 }
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29
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30
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31 public AbstractTranslationSet LoadTranslations(string path)
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32 {
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33 FileInfo file = new FileInfo(path);
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34
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35 if (!file.Exists)
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36 {
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37 throw new TranslationLoadException("Translation file "+file.FullName+" did not exist");
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38 }
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39
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40 XmlDocument doc = LoadTranslationDocument(file);
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41 XmlTranslationSet translations = new XmlTranslationSet(extractor.GetLanguageOfDocument(doc));
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42 translations.SetParentLanguage(extractor.GetParentLanguageOfDocument(doc));
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43 translations.SetTranslationNodes(extractor.GetTranslationNodes(doc));
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44 return translations;
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45 }
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46
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47 private XmlDocument LoadTranslationDocument(FileInfo file)
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48 {
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49 XmlDocument doc = new XmlDocument();
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50 XmlReader valReader = XmlReader.Create(file.OpenRead(), GetReaderSettings());
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51
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52 try
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53 {
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54 doc.Load(valReader);
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55 }
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56 catch (DirectoryNotFoundException ex)
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57 {
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58 throw new TranslationLoadException("Problem validating schema for translation: " + ex.Message, ex);
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59 }
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60 catch (XmlSchemaException ex)
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61 {
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62 throw new TranslationLoadException("Problem validating schema for translation: " + ex.Message, ex);
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63 }
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64 catch (XmlException ex)
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65 {
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66 throw new TranslationLoadException("Problem reading data for translation: " + ex.Message, ex);
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67 }
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68 finally
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69 {
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70 valReader.Close();
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71 }
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72
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73 return doc;
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74 }
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75
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76 /// <summary>
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77 /// Lazy-getter for XML reader settings. May throw a <see cref="TranslationLoadException"/> if there is a problem with the translation schema.
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78 /// </summary>
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79 /// <returns>
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80 /// A <see cref="XmlReaderSettings"/> with the default values for validating the translation document against the translation schema
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81 /// </returns>
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82 private XmlReaderSettings GetReaderSettings()
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83 {
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84 if (settings == null)
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85 {
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86 try
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87 {
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88 settings = new XmlReaderSettings();
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89 settings.ValidationType = ValidationType.Schema;
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90 settings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings;
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91 settings.ValidationEventHandler+= new ValidationEventHandler(ValidationEventMethod);
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92 XmlSchemaSet cache = new XmlSchemaSet();
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93 cache.Add("http://ibboard.co.uk/translation", schemaLocation);
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94 settings.Schemas.Add(cache);
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95 }
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96 catch (DirectoryNotFoundException ex)
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97 {
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98 throw new TranslationLoadException("Problem validating schema for translation: " + ex.Message, ex);
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99 }
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100 catch (XmlSchemaException ex)
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101 {
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102 throw new TranslationLoadException("Problem validating schema for translation: " + ex.Message, ex);
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103 }
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104 catch (XmlException ex)
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105 {
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106 throw new TranslationLoadException("Problem reading data for schema: " + ex.Message, ex);
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107 }
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108 }
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109
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110 return settings;
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111 }
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112
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113 private void ValidationEventMethod(object sender, ValidationEventArgs e)
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114 {
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115 throw new TranslationLoadException("Problem validating schema for translation: " + e.Exception.Message, e.Exception);
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116 }
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117 }
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118 }