PrtCap_Reader.cs source code in C# .NET

                        
Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Print / Reach / PrintConfig / PrtCap_Reader.cs / 1 / PrtCap_Reader.cs
                        

                        
                            /*++ 

Copyright (C) 2003 Microsoft Corporation
All rights reserved.
 
Module Name:
 
    PrtCap_Reader.cs 

Abstract: 

    Definition and implementation of the private XmlPrintCapReader class.

Author: 

    [....] ([....]) 06/22/2003 
 
--*/
 
using System;
using System.Xml;
using System.IO;
using System.Diagnostics; 
using System.Globalization;
 
using System.Printing; 
using MS.Internal.Printing.Configuration;
 
#pragma warning disable 1634, 1691 // Allows suppression of certain PreSharp messages

namespace MS.Internal.Printing.Configuration
{ 
    /// 

    /// Reader class of XML PrintCapabilities 
    /// 
 
    internal class XmlPrintCapReader
    { 
        #region Constructors

        /// 

        /// Instantiates a reader object for the given XML PrintCapabilities 
        /// 
        /// Constructor verifies the root element is valid 
        /// thrown if XML PrintCapabilities is not well-formed 
        public XmlPrintCapReader(Stream xmlStream)
        { 
            // Internally the XML PrintCapabilities reader uses XmlTextReader
            _xmlReader = new XmlTextReader(xmlStream);

            // We need namespace support from the reader. 
            _xmlReader.Namespaces = true;
 
            // Don't resolve external resources. 
            _xmlReader.XmlResolver = null;
 
            // Verify root element is  in our standard namespace
            if ((_xmlReader.MoveToContent() != XmlNodeType.Element) ||
                (_xmlReader.LocalName != PrintSchemaTags.Framework.PrintCapRoot) ||
                (_xmlReader.NamespaceURI != PrintSchemaNamespaces.Framework)) 
            {
                throw NewPrintCapFormatException(String.Format(CultureInfo.CurrentCulture, 
                                                 PTUtility.GetTextFromResource("FormatException.InvalidRootElement"), 
                                                 _xmlReader.NamespaceURI,
                                                 _xmlReader.LocalName)); 
            }

            // Verify the XML PrintCapabilities version is supported
 
            // For XML attribute without a prefix (e.g. <... name="prn:PageMediaSize">),
            // even though the XML document has default namespace defined as our standard 
            // Print Schema framework namespace, the XML atribute still has NULL namespaceURI. 
            // It will only have the correct namespaceURI when a prefix is used. This doesn't
            // apply to XML element, whose namespaceURI works fine with default namespace. 

            // GetAttribute doesn't move the reader cursor away from the current element
            string version = _xmlReader.GetAttribute(PrintSchemaTags.Framework.RootVersionAttr,
                                                     PrintSchemaNamespaces.FrameworkAttrForXmlReader); 

            if (version == null) 
            { 
                throw NewPrintCapFormatException(String.Format(CultureInfo.CurrentCulture,
                                                 PTUtility.GetTextFromResource("FormatException.RootMissingAttribute"), 
                                                 PrintSchemaTags.Framework.RootVersionAttr));
            }

            // Convert string to number to verify 
            decimal versionNum;
 
            try 
            {
                versionNum = XmlConvertHelper.ConvertStringToDecimal(version); 
            }
            catch (FormatException e)
            {
                throw NewPrintCapFormatException(String.Format(CultureInfo.CurrentCulture, 
                                                 PTUtility.GetTextFromResource("FormatException.RootInvalidAttribute"),
                                                 PrintSchemaTags.Framework.RootVersionAttr, 
                                                 version), 
                                                 e);
            } 

            if (versionNum != PrintSchemaTags.Framework.SchemaVersion)
            {
                throw NewPrintCapFormatException(String.Format(CultureInfo.CurrentCulture, 
                                                 PTUtility.GetTextFromResource("FormatException.VersionNotSupported"),
                                                 versionNum)); 
            } 

            // Reset internal states to be ready for client's reading of the PrintCapabilities XML 
            ResetCurrentElementState();
        }

        #endregion Constructors 

        #region Public Methods 
 
        /// 

        /// Moves the reader cursor to the next Print Schema Framework element at the given depth. 
        /// (The element could be Feature, ParameterDefinition, Option, ScoredProperty or Property)
        /// 
        /// client-requested traversing depth
        /// flags to indicate client interested node types 
        /// True if next Framework element is ready to read.
        /// False if no more Framework element at the given depth. 
        /// XML is not well-formed. 
        public bool MoveToNextSchemaElement(int depth, PrintSchemaNodeTypes typeFilterFlags)
        { 
            bool foundElement = false;

            while (!foundElement && _xmlReader.Read())
            { 
                // Read() throws XmlException if error occurred while parsing the XML.
 
                // If we hit an end-element tag at higher depth, we know there are no more 
                // Framework elements at the client-requested depth.
                if ((_xmlReader.NodeType == XmlNodeType.EndElement) && 
                    (_xmlReader.Depth < depth))
                {
                    break;
                } 

                // Stop at the next XML start element at the client-requested depth 
                // and in the standard Framework element namespace. 
                if ((_xmlReader.NodeType != XmlNodeType.Element) ||
                    (_xmlReader.Depth != depth) || 
                    (_xmlReader.NamespaceURI != PrintSchemaNamespaces.Framework))
                {
                    continue;
                } 

                // Find a candidate, so reset internal states to be ready for its parsing. 
                ResetCurrentElementState(); 

                foundElement = true; 

                _currentElementDepth = depth;
                _currentElementIsEmpty = _xmlReader.IsEmptyElement;
 
                // Map element name to Schema node type
                int enumValue = PrintSchemaMapper.SchemaNameToEnumValueWithMap( 
                                                  PrintSchemaTags.Framework.NodeTypeMapTable, 
                                                  _xmlReader.LocalName);
 
                if (enumValue > 0)
                {
                    _currentElementNodeType = (PrintSchemaNodeTypes)enumValue;
                } 
                else
                { 
                    #if _DEBUG 
                    Trace.WriteLine("-Warning- skip unknown element '" + _xmlReader.LocalName +
                                    "' at line " + _xmlReader.LineNumber + ", position " + 
                                    _xmlReader.LinePosition);
                    #endif

                    foundElement = false; 
                }
 
                if (foundElement) 
                {
                    // Check whether or not the found element type is what client is interested in. 
                    // If not, we will skip this element.
                    if ((CurrentElementNodeType & typeFilterFlags) == 0)
                    {
                        #if _DEBUG 
                        Trace.WriteLine("-Warning- skip not-wanted element '" + _xmlReader.LocalName +
                                        "' at line " + _xmlReader.LineNumber + ", position " + 
                                        _xmlReader.LinePosition); 
                        #endif
 
                        foundElement = false;
                    }
                }
 
                if (foundElement)
                { 
                    // The element is what the client wants. 
                    if (CurrentElementNodeType != PrintSchemaNodeTypes.Value)
                    { 
                        // Element other than  should have the "name" XML attribute.
                        // Reader will verify the "name" XML attribute has a QName value that
                        // is in our standard Keyword namespace.
                        string QName = _xmlReader.GetAttribute(PrintSchemaTags.Framework.NameAttr, 
                                                               PrintSchemaNamespaces.FrameworkAttrForXmlReader);
 
                        // Only  element is allowed not to have the "name" XML attribute 
                        if (QName == null)
                        { 
                            if (CurrentElementNodeType != PrintSchemaNodeTypes.Option)
                            {
                                #if _DEBUG
                                Trace.WriteLine("-Warning- skip element " + CurrentElementNodeType + 
                                                " at line " + _xmlReader.LineNumber + ", position " +
                                                _xmlReader.LinePosition + " due to missing 'name' XML attribute"); 
                                #endif 

                                foundElement = false; 
                            }
                        }
                        else
                        { 
                            string URI = XmlReaderQName.GetURI(_xmlReader, QName);
                            string localName = XmlReaderQName.GetLocalName(QName); 
 
                            if (URI == PrintSchemaNamespaces.Framework)
                            { 
                                _currentElementPSFNameAttrValue = localName;
                            }
                            else if (URI == PrintSchemaNamespaces.StandardKeywordSet)
                            { 
                                _currentElementNameAttrValue = localName;
                            } 
                            else 
                            {
                                // If QName value is not in standard PSF or PSK namespace, 
                                // then skip this Schema element.
                                #if _DEBUG
                                Trace.WriteLine("-Warning- skip element " + CurrentElementNodeType +
                                                " at line " + _xmlReader.LineNumber + ", position " + 
                                                _xmlReader.LinePosition +
                                                " due to non-PSF/PSK 'name' XML attribute value: " + QName); 
                                #endif 

                                foundElement = false; 
                            }
                        }
                    }
                    else 
                    {
                        // For  element, we need to get its element text value. 
                        // If this function tells client the  element is found, it guarantees 
                        // that the  element text value is non-empty.
 
                        //


                        _currentElementTextValue = _xmlReader.ReadElementString(); 

                        // Our schema requires that  element should always have non-empty value. 
                        if ((_currentElementTextValue == null) || (_currentElementTextValue.Length == 0)) 
                        {
                            #if _DEBUG 
                            Trace.WriteLine("-Warning- skip element " + CurrentElementNodeType +
                                            " at line " + _xmlReader.LineNumber + ", position " +
                                            _xmlReader.LinePosition + " since it has empty element text");
                            #endif 

                            _currentElementTextValue = null; 
                            foundElement = false; 
                        }
                    } 
                }
            }

            return foundElement; 
        }
 
        /// 
 
        /// Generic processing of option-element XML attributes
        /// 
 
        /// none
        public void OptionAttributeGenericHandler(PrintCapabilityOption option)
        {
            // Currently we support these option-element attributes: 
            // "name"
 
            // Handle the "name" XML attribute 
            option._optionName = this.CurrentElementNameAttrValue;
        } 

        /// 

        /// Gets current Property/ScoredProperty's full text value from its "Value" child-element.
        /// 
 
        /// can't find the value
        /// XML is not well-formed. 
        public string GetCurrentPropertyFullValueWithException() 
        {
            // No need to loop here. We just need to look for the first  child-element 
            if (!MoveToNextSchemaElement(CurrentElementDepth + 1, PrintSchemaNodeTypes.Value))
            {
                throw NewPrintCapFormatException(String.Format(CultureInfo.CurrentCulture,
                                                 PTUtility.GetTextFromResource("FormatException.MissingRequiredChildElement"), 
                                                 PrintSchemaTags.Framework.Value,
                                                 _xmlReader.LineNumber, 
                                                 _xmlReader.LinePosition)); 
            }
 
            return CurrentElementTextValue;
        }

        /// 
 
        /// Gets current Property/ScoredProperty's integer value from its "Value" child-element
        /// 
 
        /// either can't find the value or find invalid value number 
        /// XML is not well-formed.
        public int GetCurrentPropertyIntValueWithException() 
        {
            // Do the assignment outside of try-catch so the FormatException of value-not-found could be thrown properly.
            string textValue = GetCurrentPropertyFullValueWithException();
 
            int intValue = 0;
 
            try 
            {
                intValue = XmlConvertHelper.ConvertStringToInt32(textValue); 
            }
            catch (FormatException e)
            {
                throw NewPrintCapFormatException(String.Format(CultureInfo.CurrentCulture, 
                                                 PTUtility.GetTextFromResource("FormatException.InvalidXMLIntValue"),
                                                 CurrentElementTextValue, 
                                                 _xmlReader.LineNumber, 
                                                 _xmlReader.LinePosition),
                                                 e); 
            }

            return intValue;
        } 

        /// 
 
        /// Gets current Property/ScoredProperty's QName LocalName value from its "Value" child-element. 
        /// The returned property QName value is guaranteed to be in the standard keyword set namespace.
        /// 
 
        /// either can't find the value or value is private
        /// XML is not well-formed.
        public string GetCurrentPropertyQNameValueWithException()
        { 
            string QName = GetCurrentPropertyFullValueWithException();
 
            if (XmlReaderQName.GetURI(_xmlReader, QName) == PrintSchemaNamespaces.StandardKeywordSet) 
            {
                return XmlReaderQName.GetLocalName(QName); 
            }
            else
            {
                // 
                throw NewPrintCapFormatException(String.Format(CultureInfo.CurrentCulture,
                                                 PTUtility.GetTextFromResource("FormatException.PrivateXMLTextValue"), 
                                                 QName, 
                                                 _xmlReader.LineNumber,
                                                 _xmlReader.LinePosition)); 
            }
        }

        /// 
 
        /// Gets current Property/ScoredProperty's ParameterRef name from its "ParameterRef" child-element.
        /// The returned ParameterRef name is guaranteed to be in the standard keyword set namespace. 
        /// 
 
        /// either can't find the child-element or its name is private
        /// XML is not well-formed. 
        public string GetCurrentPropertyParamRefNameWithException()
        {
            if (!MoveToNextSchemaElement(CurrentElementDepth + 1, PrintSchemaNodeTypes.ParameterRef))
            { 
                throw NewPrintCapFormatException(String.Format(CultureInfo.CurrentCulture,
                                                 PTUtility.GetTextFromResource("FormatException.MissingRequiredChildElement"), 
                                                 PrintSchemaTags.Framework.ParameterRef, 
                                                 _xmlReader.LineNumber,
                                                 _xmlReader.LinePosition)); 
            }

            return CurrentElementNameAttrValue;
        } 

        #endregion Public Methods 
 
        #region Public Properties
 
        /// 

        /// Current element's Print Schema node type
        /// 
        public PrintSchemaNodeTypes CurrentElementNodeType 
        {
            get 
            { 
                return _currentElementNodeType;
            } 
        }

        /// 

        /// Current element's depth 
        /// 
        public int CurrentElementDepth 
        { 
            get
            { 
                return _currentElementDepth;
            }
        }
 
        /// 

        /// Checks if current element is an empty XML element 
        /// 
 
        public bool CurrentElementIsEmpty
        { 
            get
            {
                return _currentElementIsEmpty;
            } 
        }
 
        /// 
 
        /// Current element's "name" XML attribute value in Print Schema Keyword namespace.
        /// 
 
        /// 
        /// The value is the localname part of a QName whose namespace is the standard
        /// Print Schema Keyword namespace.
        ///  
        public string CurrentElementNameAttrValue
        { 
            get 
            {
                return _currentElementNameAttrValue; 
            }
        }

        /// 
 
        /// Current 'Value' element's text value
        /// 
 
        public string CurrentElementTextValue 
        {
            get 
            {
                return _currentElementTextValue;
            }
        } 

        /// 
 
        /// Current element's "name" XML attribute value in Print Schema Framework namespace. 
        /// 
        ///  
        /// The value is the localname part of a QName whose namespace is the standard
        /// Print Schema Framework namespace.
        /// 
        public string CurrentElementPSFNameAttrValue 
        {
            get 
            { 
                return _currentElementPSFNameAttrValue;
            } 
        }

        #endregion Public Properties
 
        #region Internal Fields
 
        // The XML text reader instance 
        internal XmlTextReader _xmlReader;
 
        #endregion Internal Fields

        #region Private Methods
 
        /// 

        /// Resets reader's internal schema-element state so we are ready for next element 
        /// 
 
        private void ResetCurrentElementState()
        { 
            _currentElementNodeType = PrintSchemaNodeTypes.None;
            _currentElementDepth = 0;
            _currentElementIsEmpty = false;
            _currentElementNameAttrValue = null; 
            _currentElementTextValue = null;
            _currentElementPSFNameAttrValue = null; 
        } 

        /// 
 
        /// Returns a new FormatException instance for not-well-formed PrintCapabilities XML.
        /// 
        /// detailed message about the violation of well-formness
        /// the new FormatException instance 
        private static FormatException NewPrintCapFormatException(string detailMsg)
        { 
            return InternalPrintCapabilities.NewPrintCapFormatException(detailMsg); 
        }
 
        /// 

        /// Returns a new FormatException instance for not-well-formed PrintCapabilities XML.
        /// 
        /// detailed message about the violation of well-formness 
        /// the exception that causes the violation of well-formness
        /// the new FormatException instance 
        private static FormatException NewPrintCapFormatException(string detailMsg, Exception innerException) 
        {
            return InternalPrintCapabilities.NewPrintCapFormatException(detailMsg, innerException); 
        }

        #endregion Private Methods
 
        #region Private Fields
 
        private PrintSchemaNodeTypes    _currentElementNodeType; 
        private int                     _currentElementDepth;
        private bool                    _currentElementIsEmpty; 
        private string                  _currentElementNameAttrValue;
        private string                  _currentElementTextValue;
        private string                  _currentElementPSFNameAttrValue;
 
        #endregion Private Fields
    } 
 
    /// 

    /// QName helper class for XMLTextReader 
    /// 
    internal class XmlReaderQName
    {
        #region Constructors 

        // Never need to use an instance. All static methods. 
        private XmlReaderQName() {} 

        #endregion Constructors 

        #region Public Methods

        /// 
 
        /// Gets URI of the QName
        /// 
 
        /// the XmlTextReader object 
        /// the qualified name
        /// URI of the QName (null if no matching namespace is found) 
        /// none
        public static string GetURI(XmlTextReader xmlReader, string QName)
        {
            int colonIndex = QName.IndexOf(":", StringComparison.Ordinal); 

            string prefix = (colonIndex == (-1)) ? "" : QName.Substring(0, colonIndex); 
 
            // Prefix is non-null (could be empty), so LookupNamespace won't throw exception.
            // It will return null if no matching prefix is found. 
            return xmlReader.LookupNamespace(prefix);
        }

        /// 
 
        /// Gets local name of the QName
        /// 
 
        /// the qualified name 
        /// local name of the QName
        /// none 
        public static string GetLocalName(string QName)
        {
            int colonIndex = QName.IndexOf(":", StringComparison.Ordinal);
 
            return QName.Substring(colonIndex + 1);
        } 
 
        #endregion Public Methods
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.


                        

                        

                        
                        

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