mcs/class/referencesource/System.Data/System/Data/Common/HandlerBase.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="HandlerBase.cs" company="Microsoft">
   3 //      Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 // <owner current="true" primary="false">Microsoft</owner>
   7 //------------------------------------------------------------------------------
   8
   9 namespace System.Data.Common {
  10
  11     using System;
  12     using System.Collections;
  13     using System.Configuration;
  14     using System.Diagnostics;
  15     using System.Globalization;
  16     using System.Xml;
  17
  18     internal static class HandlerBase {
  19
  20         static internal void CheckForChildNodes(XmlNode node) {
  21             if (node.HasChildNodes) {
  22                 throw ADP.ConfigBaseNoChildNodes(node.FirstChild);
  23             }
  24         }
  25         static private void CheckForNonElement(XmlNode node) {
  26             if (XmlNodeType.Element != node.NodeType) {
  27                 throw ADP.ConfigBaseElementsOnly(node);
  28             }
  29         }
  30         static internal void CheckForUnrecognizedAttributes(XmlNode node) {
  31             if (0 != node.Attributes.Count) {
  32                 throw ADP.ConfigUnrecognizedAttributes(node);
  33             }
  34         }
  35
  36         // skip whitespace and comments, throws if non-element
  37         static internal bool IsIgnorableAlsoCheckForNonElement(XmlNode node) {
  38             if ((XmlNodeType.Comment == node.NodeType) || (XmlNodeType.Whitespace == node.NodeType)) {
  39                 return true;
  40             }
  41             CheckForNonElement(node);
  42             return false;
  43         }
  44
  45         static internal string RemoveAttribute(XmlNode node, string name, bool required, bool allowEmpty) {
  46             XmlNode attribute = node.Attributes.RemoveNamedItem(name);
  47             if (null == attribute) {
  48                 if (required) {
  49                     throw ADP.ConfigRequiredAttributeMissing(name, node);
  50                 }
  51                 return null;
  52             }
  53             string value = attribute.Value;
  54             if (!allowEmpty && (0 == value.Length)) {
  55                 throw ADP.ConfigRequiredAttributeEmpty(name, node);
  56             }
  57             return value;
  58         }
  59
  60         static internal DataSet CloneParent(DataSet parentConfig, bool insenstive) {
  61             if (null == parentConfig) {
  62                 parentConfig = new DataSet(DbProviderFactoriesConfigurationHandler.sectionName);
  63                 parentConfig.CaseSensitive = !insenstive;
  64                 parentConfig.Locale = CultureInfo.InvariantCulture;
  65             }
  66             else {
  67                 parentConfig = parentConfig.Copy();
  68             }
  69             return parentConfig;
  70         }
  71     }
  72 }