SchemaHelper.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / Serialization / System / Runtime / Serialization / SchemaHelper.cs / 1305376 / SchemaHelper.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Runtime.Serialization 
{
    using System; 
    using System.Xml; 
    using System.Xml.Schema;
    using System.Collections; 
    using System.Collections.Generic;
    using SchemaObjectDictionary=System.Collections.Generic.Dictionary;

    internal class SchemaObjectInfo 
    {
        internal XmlSchemaType type; 
        internal XmlSchemaElement element; 
        internal XmlSchema schema;
        internal List knownTypes; 

        internal SchemaObjectInfo(XmlSchemaType type, XmlSchemaElement element, XmlSchema schema, List knownTypes)
        {
            this.type = type; 
            this.element = element;
            this.schema = schema; 
            this.knownTypes = knownTypes; 
        }
    } 

    internal static class SchemaHelper
    {
 
        internal static bool NamespacesEqual(string ns1, string ns2)
        { 
            if (ns1 == null || ns1.Length == 0) 
                return (ns2 == null || ns2.Length == 0);
            else 
                return ns1 == ns2;
        }

        internal static XmlSchemaType GetSchemaType(XmlSchemaSet schemas, XmlQualifiedName typeQName, out XmlSchema outSchema) 
        {
            outSchema = null; 
            ICollection currentSchemas = schemas.Schemas(); 
            string ns = typeQName.Namespace;
            foreach (XmlSchema schema in currentSchemas) 
            {
                if (NamespacesEqual(ns, schema.TargetNamespace))
                {
                    outSchema = schema; 
                    foreach (XmlSchemaObject schemaObj in schema.Items)
                    { 
                        XmlSchemaType schemaType = schemaObj as XmlSchemaType; 
                        if (schemaType != null && schemaType.Name == typeQName.Name)
                        { 
                            return schemaType;
                        }
                    }
                } 
            }
            return null; 
        } 

        internal static XmlSchemaType GetSchemaType(SchemaObjectDictionary schemaInfo, XmlQualifiedName typeName) 
        {
            SchemaObjectInfo schemaObjectInfo;
            if (schemaInfo.TryGetValue(typeName, out schemaObjectInfo))
            { 
                return schemaObjectInfo.type;
            } 
            return null; 
        }
 
        internal static XmlSchema GetSchemaWithType(SchemaObjectDictionary schemaInfo, XmlSchemaSet schemas, XmlQualifiedName typeName)
        {
            SchemaObjectInfo schemaObjectInfo;
            if (schemaInfo.TryGetValue(typeName, out schemaObjectInfo)) 
            {
                if (schemaObjectInfo.schema != null) 
                    return schemaObjectInfo.schema; 
            }
            ICollection currentSchemas = schemas.Schemas(); 
            string ns = typeName.Namespace;
            foreach (XmlSchema schema in currentSchemas)
            {
                if (NamespacesEqual(ns, schema.TargetNamespace)) 
                {
                    return schema; 
                } 
            }
            return null; 
        }

        internal static XmlSchemaElement GetSchemaElement(XmlSchemaSet schemas, XmlQualifiedName elementQName, out XmlSchema outSchema)
        { 
            outSchema = null;
            ICollection currentSchemas = schemas.Schemas(); 
            string ns = elementQName.Namespace; 
            foreach (XmlSchema schema in currentSchemas)
            { 
                if (NamespacesEqual(ns, schema.TargetNamespace))
                {
                    outSchema = schema;
                    foreach (XmlSchemaObject schemaObj in schema.Items) 
                    {
                        XmlSchemaElement schemaElement = schemaObj as XmlSchemaElement; 
                        if (schemaElement != null && schemaElement.Name == elementQName.Name) 
                        {
                            return schemaElement; 
                        }
                    }
                }
            } 
            return null;
        } 
 
        internal static XmlSchemaElement GetSchemaElement(SchemaObjectDictionary schemaInfo, XmlQualifiedName elementName)
        { 
            SchemaObjectInfo schemaObjectInfo;
            if (schemaInfo.TryGetValue(elementName, out schemaObjectInfo))
            {
                return schemaObjectInfo.element; 
            }
            return null; 
        } 

        internal static XmlSchema GetSchema(string ns, XmlSchemaSet schemas) 
        {
            if (ns == null) { ns = String.Empty; }

            ICollection currentSchemas = schemas.Schemas(); 
            foreach (XmlSchema schema in currentSchemas)
            { 
                if ((schema.TargetNamespace == null && ns.Length == 0) || ns.Equals(schema.TargetNamespace)) 
                {
                    return schema; 
                }
            }
            return CreateSchema(ns, schemas);
        } 

        static XmlSchema CreateSchema(string ns, XmlSchemaSet schemas) 
        { 
            XmlSchema schema = new XmlSchema();
 
            schema.ElementFormDefault = XmlSchemaForm.Qualified;
            if (ns.Length > 0)
            {
                schema.TargetNamespace = ns; 
                schema.Namespaces.Add(Globals.TnsPrefix, ns);
            } 
 

            schemas.Add(schema); 
            return schema;
        }

        internal static void AddElementForm(XmlSchemaElement element, XmlSchema schema) 
        {
            if (schema.ElementFormDefault != XmlSchemaForm.Qualified) 
            { 
                element.Form = XmlSchemaForm.Qualified;
            } 
        }

        internal static void AddSchemaImport(string ns, XmlSchema schema)
        { 
            if (SchemaHelper.NamespacesEqual(ns, schema.TargetNamespace) || SchemaHelper.NamespacesEqual(ns, Globals.SchemaNamespace) || SchemaHelper.NamespacesEqual(ns, Globals.SchemaInstanceNamespace))
                return; 
 
            foreach (object item in schema.Includes)
            { 
                if (item is XmlSchemaImport)
                {
                    if (SchemaHelper.NamespacesEqual(ns, ((XmlSchemaImport)item).Namespace))
                        return; 
                }
            } 
 
            XmlSchemaImport import = new XmlSchemaImport();
            if (ns != null && ns.Length > 0) 
                import.Namespace = ns;
            schema.Includes.Add(import);
        }
 
        internal static XmlSchema GetSchemaWithGlobalElementDeclaration(XmlSchemaElement element, XmlSchemaSet schemas)
        { 
            ICollection currentSchemas = schemas.Schemas(); 
            foreach (XmlSchema schema in currentSchemas)
            { 
                foreach (XmlSchemaObject schemaObject in schema.Items)
                {
                    XmlSchemaElement schemaElement = schemaObject as XmlSchemaElement;
                    if (schemaElement == null) 
                        continue;
 
                    if (schemaElement == element) 
                    {
                        return schema; 
                    }
                }
            }
            return null; 
        }
 
        internal static XmlQualifiedName GetGlobalElementDeclaration(XmlSchemaSet schemas, XmlQualifiedName typeQName, out bool isNullable) 
        {
            ICollection currentSchemas = schemas.Schemas(); 
            string ns = typeQName.Namespace;
            if (ns == null)
                ns = string.Empty;
            isNullable = false; 
            foreach (XmlSchema schema in currentSchemas)
            { 
                foreach (XmlSchemaObject schemaObject in schema.Items) 
                {
                    XmlSchemaElement schemaElement = schemaObject as XmlSchemaElement; 
                    if (schemaElement == null)
                        continue;

                    if (schemaElement.SchemaTypeName.Equals(typeQName)) 
                    {
                        isNullable = schemaElement.IsNillable; 
                        return new XmlQualifiedName(schemaElement.Name, schema.TargetNamespace); 
                    }
                } 
            }
            return null;
        }
 
    }
} 
 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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