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annotate Xml/XmlTools.cs @ 26:14f3daf48ba5

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Re #18 - Migrate XML handling methods to core utils * Make double parsing method public
author IBBoard <dev@ibboard.co.uk>
date Sat, 28 Mar 2009 20:37:40 +0000
parents 148edabc9c73
children 4ea1fc351533
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1 // This file (XmlTools.cs) is a part of the IBBoard library and is copyright 2009 IBBoard
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2 //
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3 // The file and the library/program it is in are licensed under the GNU LGPL license, either version 3 of the License or (at your option) any later version. Please see COPYING.LGPL for more information and the full license.
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4 //
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5
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6 using System;
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7 using System.Xml;
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8
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9 namespace IBBoard.Xml
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10 {
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11 /// <summary>
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12 /// Some basic tools for handling XML files and retrieving their values
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13 /// </summary>
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14 public class XmlTools
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15 {
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16 /// <summary>
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17 /// Gets the value of an attribute of an element as an integer. Throws a FormatException if the attribute is not an integer.
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18 /// </summary>
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19 /// <param name="elem">
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20 /// The <see cref="XmlElement"/> to get the attribute value of
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21 /// </param>
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22 /// <param name="attributeName">
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23 /// The name of the attribute to get as an integer
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24 /// </param>
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25 /// <returns>
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26 /// The value of the attribute as an integer
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27 /// </returns>
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28 public static int GetIntValueFromAttribute(XmlElement elem, string attributeName)
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29 {
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30 try
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31 {
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32 return int.Parse(elem.GetAttribute(attributeName));
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33 }
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34 catch(FormatException)
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35 {
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36 throw new FormatException(String.Format("Attribute '{0}' of {1} with ID {2} was not a valid number", attributeName, elem.Name, elem.GetAttribute("id")));
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37 }
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38 }
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39
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40 /// <summary>
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41 /// Gets the value of an attribute of an element as a double. Throws a FormatException if the attribute is not a double.
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42 /// </summary>
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43 /// <param name="elem">
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44 /// The <see cref="XmlElement"/> to get the attribute value of
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45 /// </param>
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46 /// <param name="attributeName">
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47 /// The name of the attribute to get as a double
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48 /// </param>
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49 /// <returns>
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50 /// The value of the attribute as an double
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51 /// </returns>
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52 public static double GetDoubleValueFromAttribute(XmlElement elem, string attributeName)
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53 {
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54 double doubleVal = double.NaN;
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55 string attribValue = elem.GetAttribute(attributeName);
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56
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57 if (attribValue == "INF")
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58 {
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59 doubleVal = double.PositiveInfinity;
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60 }
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61 else
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62 {
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63 try
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64 {
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65 return int.Parse(attribValue);
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66 }
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67 catch(FormatException)
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68 {
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69 throw new FormatException(String.Format("Attribute '{0}' of {1} with ID {2} was not a valid number", attributeName, elem.Name, elem.GetAttribute("id")));
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70 }
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71 }
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72
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73 return doubleVal;
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74 }
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75 }
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76 }