XPathExpr.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Dispatcher / XPathExpr.cs / 1 / XPathExpr.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------
namespace System.ServiceModel.Dispatcher
{ 
    using System.Collections;
    using System.Diagnostics; 
    using System.Xml; 
    using System.Xml.Xsl;
    using System.Xml.XPath; 

    internal enum XPathExprType : byte
    {
        Unknown, 
        Or,
        And, 
        Relational, 
        Union,
        LocationPath, 
        RelativePath,
        PathStep,
        XsltVariable,
        String, 
        Number,
        Function, 
        XsltFunction, 
        Math,
        Filter, 
        Path
    }

    internal class XPathExpr 
    {
        ValueDataType returnType; 
        XPathExprList subExpr; 
        XPathExprType type;
        bool negate; 
        bool castRequired;

        internal XPathExpr(XPathExprType type, ValueDataType returnType, XPathExprList subExpr)
            : this(type, returnType) 
        {
            this.subExpr = subExpr; 
        } 

        internal XPathExpr(XPathExprType type, ValueDataType returnType) 
        {
            this.type = type;
            this.returnType = returnType;
        } 

        internal virtual bool IsLiteral 
        { 
            get
            { 
                return false;
            }
        }
 
        internal bool Negate
        { 
            get 
            {
                return this.negate; 
            }
            set
            {
                this.negate = value; 
            }
        } 
 
        internal ValueDataType ReturnType
        { 
            get
            {
                return this.returnType;
            } 
            set
            { 
                this.returnType = value; 
            }
        } 

        internal int SubExprCount
        {
            get 
            {
                return (null == this.subExpr) ? 0 : this.subExpr.Count; 
            } 
        }
 
        internal XPathExprList SubExpr
        {
            get
            { 
                if (null == this.subExpr)
                { 
                    this.subExpr = new XPathExprList(); 
                }
                return this.subExpr; 
            }
        }

        internal XPathExprType Type 
        {
            get 
            { 
                return this.type;
            } 
        }

        internal bool TypecastRequired
        { 
            get
            { 
                return this.castRequired; 
            }
            set 
            {
                this.castRequired = value;
            }
        } 

        internal void Add(XPathExpr expr) 
        { 
            DiagnosticUtility.DebugAssert(null != expr, "");
            this.SubExpr.Add(expr); 
        }

        internal void AddBooleanExpression(XPathExprType boolExprType, XPathExpr expr)
        { 
            DiagnosticUtility.DebugAssert(boolExprType == this.type, "");
 
            // An boolean sub0expression that is of the same type as its container should be merged and flattened 
            // into its parent
            if (boolExprType == expr.Type) 
            {
                XPathExprList subExprList = expr.SubExpr;
                for (int i = 0; i < subExprList.Count; ++i)
                { 
                    this.AddBooleanExpression(boolExprType, subExprList[i]);
                } 
            } 
            else
            { 
                this.Add(expr);
            }
        }
    } 

    internal class XPathExprList 
    { 
        ArrayList list;
 
        internal XPathExprList()
        {
            this.list = new ArrayList(2);
        } 

        internal int Count 
        { 
            get
            { 
                return this.list.Count;
            }
        }
 
        internal XPathExpr this[int index]
        { 
            get 
            {
                return (XPathExpr) this.list[index]; 
            }
        }

        internal void Add(XPathExpr expr) 
        {
            DiagnosticUtility.DebugAssert(null != expr, ""); 
            this.list.Add(expr); 
        }
    } 

    internal class XPathConjunctExpr : XPathExpr
    {
        internal XPathConjunctExpr(XPathExprType type, ValueDataType returnType, XPathExpr left, XPathExpr right) 
            : base(type, returnType)
        { 
            if (null == left || null == right) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new QueryCompileException(QueryCompileError.InvalidExpression)); 
            }
            this.SubExpr.Add(left);
            this.SubExpr.Add(right);
        } 

        internal XPathExpr Left 
        { 
            get
            { 
                return this.SubExpr[0];
            }
        }
 
        internal XPathExpr Right
        { 
            get 
            {
                return this.SubExpr[1]; 
            }
        }
    }
 
    internal class XPathRelationExpr : XPathConjunctExpr
    { 
        RelationOperator op; 

        internal XPathRelationExpr(RelationOperator op, XPathExpr left, XPathExpr right) 
            : base(XPathExprType.Relational, ValueDataType.Boolean, left, right)
        {
            this.op = op;
        } 

        internal RelationOperator Op 
        { 
            get
            { 
                return this.op;
            }
            set
            { 
                this.op = value;
            } 
        } 
    }
 
    internal class XPathMathExpr : XPathConjunctExpr
    {
        MathOperator op;
 
        internal XPathMathExpr(MathOperator op, XPathExpr left, XPathExpr right)
            : base(XPathExprType.Math, ValueDataType.Double, left, right) 
        { 
            this.op = op;
        } 

        internal MathOperator Op
        {
            get 
            {
                return this.op; 
            } 
        }
    } 

    internal class XPathFunctionExpr : XPathExpr
    {
        QueryFunction function; 

        internal XPathFunctionExpr(QueryFunction function, XPathExprList subExpr) 
            : base(XPathExprType.Function, function.ReturnType, subExpr) 
        {
            DiagnosticUtility.DebugAssert(null != function, ""); 
            this.function = function;
        }

        internal QueryFunction Function 
        {
            get 
            { 
                return this.function;
            } 
        }
    }

    internal class XPathXsltFunctionExpr : XPathExpr 
    {
        XsltContext context; 
        IXsltContextFunction function; 

        internal XPathXsltFunctionExpr(XsltContext context, IXsltContextFunction function, XPathExprList subExpr) 
            : base(XPathExprType.XsltFunction, ConvertTypeFromXslt(function.ReturnType), subExpr)
        {
            this.function = function;
            this.context = context; 
        }
 
        internal XsltContext Context 
        {
            get 
            {
                return this.context;
            }
        } 

        internal IXsltContextFunction Function 
        { 
            get
            { 
                return this.function;
            }
        }
 
        internal static XPathResultType ConvertTypeToXslt(ValueDataType type)
        { 
            switch(type) 
            {
                case ValueDataType.Boolean: 
                    return XPathResultType.Boolean;

                case ValueDataType.Double:
                    return XPathResultType.Number; 

                case ValueDataType.Sequence: 
                    return XPathResultType.NodeSet; 

                case ValueDataType.String: 
                    return XPathResultType.String;

                default:
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new QueryCompileException(QueryCompileError.InvalidTypeConversion)); 
            }
        } 
 
        internal static ValueDataType ConvertTypeFromXslt(XPathResultType type)
        { 
            switch(type)
            {
                case XPathResultType.Boolean:
                    return ValueDataType.Boolean; 

                case XPathResultType.Number: 
                    return ValueDataType.Double; 

                case XPathResultType.NodeSet: 
                    return ValueDataType.Sequence;

                case XPathResultType.String:
                    return ValueDataType.String; 

                default: 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new QueryCompileException(QueryCompileError.InvalidTypeConversion)); 
            }
        } 
    }

    internal class XPathXsltVariableExpr : XPathExpr
    { 
        XsltContext context;
        IXsltContextVariable variable; 
 
        internal XPathXsltVariableExpr(XsltContext context, IXsltContextVariable variable)
            : base(XPathExprType.XsltVariable, XPathXsltFunctionExpr.ConvertTypeFromXslt(variable.VariableType)) 
        {
            DiagnosticUtility.DebugAssert(null != variable, "");
            this.variable = variable;
            this.context = context; 
        }
 
        internal XsltContext Context 
        {
            get 
            {
                return this.context;
            }
        } 

        internal IXsltContextVariable Variable 
        { 
            get
            { 
                return this.variable;
            }
        }
    } 

    internal class XPathStepExpr : XPathExpr 
    { 
        NodeSelectCriteria selectDesc;
 
        internal XPathStepExpr(NodeSelectCriteria desc)
            : this(desc, null)
        {
        } 

        internal XPathStepExpr(NodeSelectCriteria desc, XPathExprList predicates) 
            : base(XPathExprType.PathStep, ValueDataType.Sequence, predicates) 
        {
            DiagnosticUtility.DebugAssert(null != desc, ""); 
            this.selectDesc = desc;
        }

        internal NodeSelectCriteria SelectDesc 
        {
            get 
            { 
                return this.selectDesc;
            } 
        }
    }

    internal abstract class XPathLiteralExpr : XPathExpr 
    {
        internal XPathLiteralExpr(XPathExprType type, ValueDataType returnType) 
            : base(type, returnType) 
        {
        } 

        internal override bool IsLiteral
        {
            get 
            {
                return true; 
            } 
        }
 
        internal abstract object Literal
        {
            get;
        } 

    } 
 
    internal class XPathStringExpr : XPathLiteralExpr
    { 
        string literal;

        internal XPathStringExpr(string literal)
            : base(XPathExprType.String, ValueDataType.String) 
        {
            this.literal = literal; 
        } 

        internal override object Literal 
        {
            get
            {
                return this.literal; 
            }
        } 
 
        internal string String
        { 
            get
            {
                return this.literal;
            } 
        }
    } 
 
    internal class XPathNumberExpr : XPathLiteralExpr
    { 
        double literal;

        internal XPathNumberExpr(double literal)
            : base(XPathExprType.Number, ValueDataType.Double) 
        {
            this.literal = literal; 
        } 

        internal override object Literal 
        {
            get
            {
                return this.literal; 
            }
        } 
 
        internal double Number
        { 
            get
            {
                return this.literal;
            } 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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XPathExpr.cs source code in C# .NET

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