1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Text;
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4 | using System.IO;
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5 | using System.IO.IsolatedStorage;
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6 | using System.Xml.Serialization;
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7 | using System.Security.Permissions;
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8 |
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9 | namespace IndianHealthService.BMXNet.WinForm.Configuration
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10 | {
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11 |
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12 | /// <summary>
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13 | /// LocalPersistentStore is the core BMX implementation for the most common
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14 | /// local setting store patterns:
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15 | ///
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16 | /// 1) In a special folder
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17 | /// 2) In any specified path
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18 | /// 3) In IsolatedStorage
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19 | ///
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20 | /// Use the object factory static class methods to create the different storage
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21 | /// mechanisms.
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22 | /// </summary>
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23 | public class LocalPersistentStore : PersistentStore
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24 | {
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25 | private bool _attemptAncestorKeysOnRead = false;
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26 |
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27 | public bool AttemptAncestorKeysOnRead
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28 | {
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29 | get { return _attemptAncestorKeysOnRead; }
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30 | set { _attemptAncestorKeysOnRead = value; }
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31 | }
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32 |
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33 | public static LocalPersistentStore CreateIn(Environment.SpecialFolder aSpecialFolder, String subDirectoryPath,bool tryParentKeysOnRead)
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34 | {
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35 | LocalPersistentStore answer = new LocalPersistentStore();
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36 | answer.SpecialFolder = aSpecialFolder;
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37 | answer.DirectoryPath = subDirectoryPath;
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38 | answer.AttemptAncestorKeysOnRead = tryParentKeysOnRead;
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39 | return answer;
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40 |
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41 | }
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42 |
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43 | public static LocalPersistentStore CreateIn(String aDirectoryPath, bool tryParentKeysOnRead)
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44 | {
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45 | LocalPersistentStore answer = new LocalPersistentStore();
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46 | answer.DirectoryPath = aDirectoryPath;
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47 | answer.AttemptAncestorKeysOnRead = tryParentKeysOnRead;
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48 | return answer;
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49 | }
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50 |
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51 | protected static LocalPersistentStore CreateIn(IsolatedStorageScope aScope, bool tryParentKeysOnRead)
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52 | {
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53 | LocalPersistentStore answer = new LocalPersistentStore();
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54 | answer.IsolatedStorageScope = aScope;
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55 | answer.AttemptAncestorKeysOnRead = tryParentKeysOnRead;
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56 | return answer;
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57 | }
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58 |
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59 | public static LocalPersistentStore CreateDefaultStorage(bool tryParentKeysOnRead)
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60 | {
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61 | return CreateIn(System.IO.IsolatedStorage.IsolatedStorageScope.User | System.IO.IsolatedStorage.IsolatedStorageScope.Assembly, tryParentKeysOnRead);
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62 | }
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63 |
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64 | private Environment.SpecialFolder? _specialFolder = null;
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65 |
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66 | public Environment.SpecialFolder? SpecialFolder
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67 | {
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68 | get { return _specialFolder; }
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69 | set { _specialFolder = value; }
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70 | }
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71 |
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72 | private String _directoryPath = null;
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73 |
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74 | public String DirectoryPath
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75 | {
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76 | get { return _directoryPath; }
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77 | set { _directoryPath = value; }
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78 | }
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79 |
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80 |
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81 | private IsolatedStorageScope? _isolatedStorageScope = null;
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82 |
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83 | public IsolatedStorageScope? IsolatedStorageScope
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84 | {
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85 | get { return _isolatedStorageScope; }
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86 | set { _isolatedStorageScope = value; }
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87 | }
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88 |
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89 |
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90 | private T ReadFromFileSystem<T>(String aDirectory, params string[] keys)
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91 | {
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92 | String path = Path.Combine(aDirectory, this.TranslateToValidFileName(keys));
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93 |
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94 | T result = default(T);
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95 |
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96 | using (Stream stream = File.OpenRead(path))
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97 | {
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98 | XmlSerializer serializer = new XmlSerializer(typeof(T));
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99 | result=(T)serializer.Deserialize(stream);
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100 | }
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101 | return result;
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102 | }
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103 |
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104 |
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105 | private void WriteToFileSystem<T>(String aDirectory, T anObject, params string[] keys)
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106 | {
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107 | String path = Path.Combine(aDirectory, this.TranslateToValidFileName(keys));
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108 |
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109 | if (!Directory.Exists(aDirectory))
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110 | {
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111 | Directory.CreateDirectory(aDirectory);
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112 | }
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113 |
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114 | using (Stream stream = File.Create(path))
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115 | {
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116 | XmlSerializer serializer = new XmlSerializer(typeof(T));
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117 | serializer.Serialize(stream, anObject);
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118 | }
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119 | }
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120 |
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121 | /// <summary>
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122 | /// Remove on non-letters, digits, to _ and add Bmx_ to the front.
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123 | /// </summary>
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124 | /// <param name="aKey"></param>
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125 | /// <returns></returns>
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126 | private string TranslateToValidFileName(params string[] keys)
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127 | {
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128 | StringBuilder builder = new StringBuilder();
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129 |
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130 | builder.Append("bmx_");
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131 |
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132 | foreach (String key in keys)
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133 | {
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134 | foreach (char each in key)
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135 | {
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136 | builder.Append((Char.IsLetterOrDigit(each)) ? each : '_');
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137 | }
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138 | builder.Append("_");
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139 | }
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140 |
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141 | builder.Append("config.xml");
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142 |
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143 | return builder.ToString();
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144 | }
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145 |
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146 |
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147 |
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148 | /// <summary>
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149 | /// Isolated storage is scoped on user/application isolated storage
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150 | /// </summary>
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151 | /// <param name="aKey"></param>
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152 | /// <returns></returns>
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153 | private T ReadFromIsolatedStorage<T>(params string[] keys)
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154 | {
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155 | T result = default(T);
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156 |
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157 | String validFileName = this.TranslateToValidFileName(keys) + ".is";
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158 |
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159 | using (IsolatedStorageFile storage = IsolatedStorageFile.GetStore(this.IsolatedStorageScope.Value,null, null))
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160 | {
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161 | using (Stream stream = new IsolatedStorageFileStream(validFileName, FileMode.Open, FileAccess.Read, storage))
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162 | {
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163 | XmlSerializer serializer = new XmlSerializer(typeof(T));
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164 | result = (T)serializer.Deserialize(stream);
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165 | }
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166 | }
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167 | return result;
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168 | }
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169 |
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170 |
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171 |
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172 | /// <summary>
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173 | /// Isolated storage is scoped on user/application isolated storage
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174 | /// </summary>
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175 | /// <param name="aKey"></param>
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176 | /// <param name="someContent"></param>
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177 | private void WriteToIsolatedStorage<T>(T anObject, string[] keys)
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178 | {
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179 | String validFileName = this.TranslateToValidFileName(keys) + ".is";
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180 |
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181 | using (IsolatedStorageFile storage = IsolatedStorageFile.GetStore(this.IsolatedStorageScope.Value, null,null))
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182 | {
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183 | using (Stream stream = new IsolatedStorageFileStream(validFileName, FileMode.Create, FileAccess.Write, storage))
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184 | {
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185 | XmlSerializer serializer = new XmlSerializer(typeof(T));
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186 | serializer.Serialize(stream,anObject);
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187 | }
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188 | }
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189 | }
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190 |
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191 |
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192 | public T Read<T>(params string[] keys)
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193 | {
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194 | String[] keysToUse = keys;
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195 |
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196 | try
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197 | {
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198 | if (this.IsolatedStorageScope.HasValue)
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199 | {
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200 | return this.ReadFromIsolatedStorage<T>(keysToUse);
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201 | }
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202 | else if (this.SpecialFolder.HasValue)
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203 | {
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204 | return this.ReadFromFileSystem<T>(Path.Combine(Environment.GetFolderPath(this.SpecialFolder.Value),this.DirectoryPath), keysToUse);
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205 | }
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206 | else if (this.DirectoryPath != null)
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207 | {
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208 | return this.ReadFromFileSystem<T>(this.DirectoryPath, keysToUse);
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209 | }
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210 | else
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211 | {
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212 | return default(T);
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213 | }
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214 | }
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215 | catch
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216 | {
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217 | if (this.AttemptAncestorKeysOnRead && keysToUse.Length>1) {
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218 | string[] newKeysToUse=new string[keysToUse.Length-1];
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219 | Array.Copy(keysToUse, newKeysToUse, keysToUse.Length - 1);
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220 | return this.Read<T>(newKeysToUse);
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221 | }
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222 |
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223 |
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224 | return default(T);
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225 | }
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226 | }
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227 |
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228 |
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229 | public void Write<T>(T anObject, params string[] keys)
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230 | {
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231 | if (this.IsolatedStorageScope.HasValue)
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232 | {
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233 | this.WriteToIsolatedStorage<T>(anObject, keys);
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234 | }
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235 | else if (this.SpecialFolder.HasValue)
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236 | {
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237 | this.WriteToFileSystem<T>(Path.Combine(Environment.GetFolderPath(this.SpecialFolder.Value),this.DirectoryPath), anObject, keys);
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238 | }
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239 | else if (this.DirectoryPath != null)
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240 | {
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241 | this.WriteToFileSystem<T>(this.DirectoryPath, anObject, keys);
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242 | }
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243 | else
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244 | {
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245 | throw new Exception("Local persistent store not configured.");
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246 | }
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247 | }
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248 |
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249 | }
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250 | }
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