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//------------------------------------------------------------------------------
// <copyright file="HandlerBase.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Configuration {
using System.Globalization;
using System.Xml;
internal class HandlerBase {
private HandlerBase() {
}
//
// XML Attribute Helpers
//
private static XmlNode GetAndRemoveAttribute(XmlNode node, string attrib, bool fRequired) {
XmlNode a = node.Attributes.RemoveNamedItem(attrib);
// If the attribute is required and was not present, throw
if (fRequired && a == null) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_missing_required_attribute, attrib, node.Name),
node);
}
return a;
}
private static XmlNode GetAndRemoveStringAttributeInternal(XmlNode node, string attrib, bool fRequired, ref string val) {
XmlNode a = GetAndRemoveAttribute(node, attrib, fRequired);
if (a != null)
val = a.Value;
return a;
}
internal static XmlNode GetAndRemoveStringAttribute(XmlNode node, string attrib, ref string val) {
return GetAndRemoveStringAttributeInternal(node, attrib, false /*fRequired*/, ref val);
}
#if UNUSED_CODE
internal static XmlNode GetAndRemoveRequiredStringAttribute(XmlNode node, string attrib, ref string val) {
return GetAndRemoveStringAttributeInternal(node, attrib, true /*fRequired*/, ref val);
}
#endif
// input.Xml cursor must be at a true/false XML attribute
private static XmlNode GetAndRemoveBooleanAttributeInternal(XmlNode node, string attrib, bool fRequired, ref bool val) {
XmlNode a = GetAndRemoveAttribute(node, attrib, fRequired);
if (a != null) {
try {
val = bool.Parse(a.Value);
}
catch (Exception e) {
throw new ConfigurationErrorsException(
SR.GetString(SR.GetString(SR.Config_invalid_boolean_attribute, a.Name)),
e, a);
}
}
return a;
}
internal static XmlNode GetAndRemoveBooleanAttribute(XmlNode node, string attrib, ref bool val) {
return GetAndRemoveBooleanAttributeInternal(node, attrib, false /*fRequired*/, ref val);
}
#if UNUSED_CODE
internal static XmlNode GetAndRemoveRequiredBooleanAttribute(XmlNode node, string attrib, ref bool val) {
return GetAndRemoveBooleanAttributeInternal(node, attrib, true /*fRequired*/, ref val);
}
#endif
// input.Xml cursor must be an integer XML attribute
private static XmlNode GetAndRemoveIntegerAttributeInternal(XmlNode node, string attrib, bool fRequired, ref int val) {
XmlNode a = GetAndRemoveAttribute(node, attrib, fRequired);
if (a != null) {
if (a.Value.Trim() != a.Value) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_invalid_integer_attribute, a.Name), a);
}
try {
val = int.Parse(a.Value, CultureInfo.InvariantCulture);
}
catch (Exception e) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_invalid_integer_attribute, a.Name),
e, a);
}
}
return a;
}
internal static XmlNode GetAndRemoveIntegerAttribute(XmlNode node, string attrib, ref int val) {
return GetAndRemoveIntegerAttributeInternal(node, attrib, false /*fRequired*/, ref val);
}
#if UNUSED_CODE
internal static XmlNode GetAndRemoveRequiredIntegerAttribute(XmlNode node, string attrib, ref int val) {
return GetAndRemoveIntegerAttributeInternal(node, attrib, true /*fRequired*/, ref val);
}
#endif
#if UNUSED_CODE
private static XmlNode GetAndRemovePositiveIntegerAttributeInternal(XmlNode node, string attrib, bool fRequired, ref int val) {
XmlNode a = GetAndRemoveIntegerAttributeInternal(node, attrib, fRequired, ref val);
if (a != null && val < 0) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_invalid_positive_integer_attribute, attrib),
node);
}
return a;
}
#endif
#if UNUSED_CODE
internal static XmlNode GetAndRemovePositiveIntegerAttribute(XmlNode node, string attrib, ref int val) {
return GetAndRemovePositiveIntegerAttributeInternal(node, attrib, false /*fRequired*/, ref val);
}
#endif
#if UNUSED_CODE
internal static XmlNode GetAndRemoveRequiredPositiveIntegerAttribute(XmlNode node, string attrib, ref int val) {
return GetAndRemovePositiveIntegerAttributeInternal(node, attrib, true /*fRequired*/, ref val);
}
#endif
#if UNUSED_CODE
private static XmlNode GetAndRemoveTypeAttributeInternal(XmlNode node, string attrib, bool fRequired, ref Type val) {
XmlNode a = GetAndRemoveAttribute(node, attrib, fRequired);
if (a != null) {
try {
val = Type.GetType(a.Value, true /*throwOnError*/);
}
catch (Exception e) {
throw new ConfigurationErrorsException(
e.Message, //SR.GetString(SR.Config_invalid_type_attribute, a.Name),
e, a);
}
}
return a;
}
#endif
#if UNUSED_CODE
internal static XmlNode GetAndRemoveTypeAttribute(XmlNode node, string attrib, ref Type val) {
return GetAndRemoveTypeAttributeInternal(node, attrib, false /*fRequired*/, ref val);
}
#endif
#if UNUSED_CODE
internal static XmlNode GetAndRemoveRequiredTypeAttribute(XmlNode node, string attrib, ref Type val) {
return GetAndRemoveTypeAttributeInternal(node, attrib, true /*fRequired*/, ref val);
}
#endif
internal static void CheckForUnrecognizedAttributes(XmlNode node) {
if (node.Attributes.Count != 0) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_base_unrecognized_attribute, node.Attributes[0].Name),
node);
}
}
//
// Obsolete XML Attribute Helpers
//
// if attribute not found return null
internal static string RemoveAttribute(XmlNode node, string name) {
XmlNode attribute = node.Attributes.RemoveNamedItem(name);
if (attribute != null) {
return attribute.Value;
}
return null;
}
// if attr not found throw standard message - "attribute x required"
internal static string RemoveRequiredAttribute(XmlNode node, string name) {
return RemoveRequiredAttribute(node, name, false/*allowEmpty*/);
}
internal static string RemoveRequiredAttribute(XmlNode node, string name, bool allowEmpty) {
XmlNode attribute = node.Attributes.RemoveNamedItem(name);
if (attribute == null) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_base_required_attribute_missing, name),
node);
}
if (String.IsNullOrEmpty(attribute.Value) && allowEmpty == false) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_base_required_attribute_empty, name),
node);
}
return attribute.Value;
}
//
// XML Element Helpers
//
internal static void CheckForNonElement(XmlNode node) {
if (node.NodeType != XmlNodeType.Element) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_base_elements_only),
node);
}
}
internal static bool IsIgnorableAlsoCheckForNonElement(XmlNode node) {
if (node.NodeType == XmlNodeType.Comment || node.NodeType == XmlNodeType.Whitespace) {
return true;
}
CheckForNonElement(node);
return false;
}
internal static void CheckForChildNodes(XmlNode node) {
if (node.HasChildNodes) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_base_no_child_nodes),
node.FirstChild);
}
}
internal static void ThrowUnrecognizedElement(XmlNode node) {
throw new ConfigurationErrorsException(
SR.GetString(SR.Config_base_unrecognized_element),
node);
}
//
// Parse Helpers
//
//
}
}
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