HandlerBase.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Sys / System / Configuration / HandlerBase.cs / 2 / HandlerBase.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

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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