QueryValue.cs source code in C# .NET

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

    internal enum ValueDataType : byte 
    {
        None = 0,
        Boolean,
        Double, 
        StackFrame,
        Sequence, 
        String 
    }
 
    // Value is like Variant. Since a Value is only temporary storage, we use memory to avoid typecasting type
    // casting, which in C# is expensive. Value contains storage for every possible XPath data type.
    // We avoid data copying by being smart about how we pass Value around - values are either accessed via
    // method calls, or the value object itself is passed by ref 
    //
    // The filter engine never deals with a single value per se. We only work with Sets of Values. A single value 
    // is a ValueSet of size 1 
    //
    internal struct Value 
    {
        bool boolVal;
        double dblVal;
        StackFrame frame; 
        NodeSequence sequence;
        string strVal; 
        ValueDataType type; 

        internal bool Boolean 
        {
            get
            {
                return this.boolVal; 
            }
            set 
            { 
                this.type = ValueDataType.Boolean;
                this.boolVal = value; 
            }
        }

        internal double Double 
        {
            get 
            { 
                return this.dblVal;
            } 
            set
            {
                this.type = ValueDataType.Double;
                this.dblVal = value; 
            }
        } 
 
        internal StackFrame Frame
        { 
            get
            {
                return this.frame;
            } 
#if NO
            set 
            { 
                this.type = ValueDataType.StackFrame;
                this.frame = value; 
            }
#endif
        }
#if NO 
        internal int FrameCount
        { 
            get 
            {
                return this.frame.Count; 
            }
        }
#endif
        internal int FrameEndPtr 
        {
#if NO 
            get 
            {
                return this.frame.endPtr; 
            }
#endif
            set
            { 
                DiagnosticUtility.DebugAssert(this.IsType(ValueDataType.StackFrame), "");
                this.frame.EndPtr = value; 
            } 
        }
#if NO 
        internal int FrameBasePtr
        {
            get
            { 
                return this.frame.basePtr;
            } 
        } 

        internal int StackPtr 
        {
            get
            {
                return this.frame.basePtr - 1; 
            }
        } 
#endif 
        internal int NodeCount
        { 
            get
            {
                return this.sequence.Count;
            } 
        }
 
        internal NodeSequence Sequence 
        {
            get 
            {
                return this.sequence;
            }
            set 
            {
                this.type = ValueDataType.Sequence; 
                this.sequence = value; 
            }
        } 

        internal string String
        {
            get 
            {
                return this.strVal; 
            } 
            set
            { 
                this.type = ValueDataType.String;
                this.strVal = value;
            }
        } 

        internal ValueDataType Type 
        { 
            get
            { 
                return this.type;
            }
        }
 
        internal void Add(double val)
        { 
            DiagnosticUtility.DebugAssert(ValueDataType.Double == this.type, ""); 
            this.dblVal += val;
        } 

#if NO
        internal void Clear()
        { 
            this.type = ValueDataType.None;
            this.sequence = null; 
        } 
#endif
        internal void Clear(ProcessingContext context) 
        {
            if (ValueDataType.Sequence == this.type)
            {
                this.ReleaseSequence(context); 
            }
            this.type = ValueDataType.None; 
        } 

        // Fully general compare 
        internal bool CompareTo(ref Value val, RelationOperator op)
        {
            switch (this.type)
            { 
                default:
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch)); 
 
                case ValueDataType.Boolean:
                switch (val.type) 
                {
                    default:
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch));
                    case ValueDataType.Boolean: 
                        return QueryValueModel.Compare(this.boolVal, val.boolVal, op);
                    case ValueDataType.Double: 
                        return QueryValueModel.Compare(this.boolVal, val.dblVal, op); 
                    case ValueDataType.Sequence:
                        return QueryValueModel.Compare(this.boolVal, val.sequence, op); 
                    case ValueDataType.String:
                        return QueryValueModel.Compare(this.boolVal, val.strVal, op);
                }
 
                case ValueDataType.Double:
                switch (val.type) 
                { 
                    default:
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch)); 
                    case ValueDataType.Boolean:
                        return QueryValueModel.Compare(this.dblVal, val.boolVal, op);
                    case ValueDataType.Double:
                        return QueryValueModel.Compare(this.dblVal, val.dblVal, op); 
                    case ValueDataType.Sequence:
                        return QueryValueModel.Compare(this.dblVal, val.sequence, op); 
                    case ValueDataType.String: 
                        return QueryValueModel.Compare(this.dblVal, val.strVal, op);
                } 

                case ValueDataType.Sequence:
                switch (val.type)
                { 
                    default:
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch)); 
                    case ValueDataType.Boolean: 
                        return QueryValueModel.Compare(this.sequence, val.boolVal, op);
                    case ValueDataType.Double: 
                        return QueryValueModel.Compare(this.sequence, val.dblVal, op);
                    case ValueDataType.Sequence:
                        return QueryValueModel.Compare(this.sequence, val.sequence, op);
                    case ValueDataType.String: 
                        return QueryValueModel.Compare(this.sequence, val.strVal, op);
                } 
 
                case ValueDataType.String:
                switch (val.type) 
                {
                    default:
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch));
                    case ValueDataType.Boolean: 
                        return QueryValueModel.Compare(this.strVal, val.boolVal, op);
                    case ValueDataType.Double: 
                        return QueryValueModel.Compare(this.strVal, val.dblVal, op); 
                    case ValueDataType.Sequence:
                        return QueryValueModel.Compare(this.strVal, val.sequence, op); 
                    case ValueDataType.String:
                        return QueryValueModel.Compare(this.strVal, val.strVal, op);
                }
            } 
        }
 
        internal bool CompareTo(double val, RelationOperator op) 
        {
            switch (this.type) 
            {
                default:
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch));
 
                case ValueDataType.Boolean:
                    return QueryValueModel.Compare(this.boolVal, val, op); 
 
                case ValueDataType.Double:
                    return QueryValueModel.Compare(this.dblVal, val, op); 

                case ValueDataType.Sequence:
                    return QueryValueModel.Compare(this.sequence, val, op);
 
                case ValueDataType.String:
                    return QueryValueModel.Compare(this.strVal, val, op); 
            } 
        }
 
        internal void ConvertTo(ProcessingContext context, ValueDataType newType)
        {
            DiagnosticUtility.DebugAssert(null != context, "");
 
            if (newType == this.type)
            { 
                return; 
            }
 
            switch(newType)
            {
                default:
                    break; 

                case ValueDataType.Boolean: 
                    this.boolVal = this.ToBoolean(); 
                    break;
 
                case ValueDataType.Double:
                    this.dblVal = this.ToDouble();
                    break;
 
                case ValueDataType.String:
                    this.strVal = this.ToString(); 
                    break; 
            }
 
            if (ValueDataType.Sequence == this.type)
            {
                this.ReleaseSequence(context);
            } 
            this.type = newType;
        } 
 
        internal bool Equals(string val)
        { 
            switch (this.type)
            {
                default:
                    DiagnosticUtility.DebugAssert("Invalid Type"); 
                    return false;
 
                case ValueDataType.Boolean: 
                    return QueryValueModel.Equals(this.boolVal, val);
 
                case ValueDataType.Double:
                    return QueryValueModel.Equals(this.dblVal, val);

                case ValueDataType.Sequence: 
                    return QueryValueModel.Equals(this.sequence, val);
 
                case ValueDataType.String: 
                    return QueryValueModel.Equals(this.strVal, val);
            } 
        }

        internal bool Equals(double val)
        { 
            switch (this.type)
            { 
                default: 
                    DiagnosticUtility.DebugAssert("Invalid Type");
                    return false; 

                case ValueDataType.Boolean:
                    return QueryValueModel.Equals(this.boolVal, val);
 
                case ValueDataType.Double:
                    return QueryValueModel.Equals(this.dblVal, val); 
 
                case ValueDataType.Sequence:
                    return QueryValueModel.Equals(this.sequence, val); 

                case ValueDataType.String:
                    return QueryValueModel.Equals(val, this.strVal);
            } 
        }
#if NO 
        internal bool Equals(bool val) 
        {
            switch (this.type) 
            {
                default:
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new QueryProcessingException(QueryProcessingError.TypeMismatch), TraceEventType.Critical);
 
                case ValueDataType.Boolean:
                    return QueryValueModel.Equals(this.boolVal, val); 
 
                case ValueDataType.Double:
                    return QueryValueModel.Equals(this.dblVal, val); 

                case ValueDataType.Sequence:
                    return QueryValueModel.Equals(this.sequence, val);
 
                case ValueDataType.String:
                    return QueryValueModel.Equals(this.strVal, val); 
            } 
        }
#endif 
        internal bool GetBoolean()
        {
            if (ValueDataType.Boolean != this.type)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch));
            } 
 
            return this.boolVal;
        } 

        internal double GetDouble()
        {
            if (ValueDataType.Double != this.type) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch)); 
            } 

            return this.dblVal; 
        }

        internal NodeSequence GetSequence()
        { 
            if (ValueDataType.Sequence != this.type)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch)); 
            }
 
            return this.sequence;
        }

        internal string GetString() 
        {
            if (ValueDataType.String != this.type) 
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch));
            } 

            return this.strVal;
        }
 
        internal bool IsType(ValueDataType type)
        { 
            return (type == this.type); 
        }
 
        internal void Multiply(double val)
        {
            DiagnosticUtility.DebugAssert(ValueDataType.Double == this.type, "");
            this.dblVal *= val; 
        }
 
        internal void Negate() 
        {
            DiagnosticUtility.DebugAssert(this.type == ValueDataType.Double, ""); 
            this.dblVal = -this.dblVal;
        }

        internal void Not() 
        {
            DiagnosticUtility.DebugAssert(this.type == ValueDataType.Boolean, ""); 
            this.boolVal = !this.boolVal; 
        }
 
        internal void ReleaseSequence(ProcessingContext context)
        {
            DiagnosticUtility.DebugAssert(null != context && this.type == ValueDataType.Sequence && null != this.sequence, "");
 
            context.ReleaseSequence(this.sequence);
            this.sequence = null; 
        } 

        internal void StartFrame(int start) 
        {
            this.type = ValueDataType.StackFrame;
            this.frame.basePtr = start + 1;
            this.frame.endPtr = start; 
        }
 
#if NO 
        internal void Subtract(double dblVal)
        { 
            DiagnosticUtility.DebugAssert(ValueDataType.Double == this.type, "");
            this.dblVal -= dblVal;
        }
#endif 
        internal bool ToBoolean()
        { 
            switch(this.type) 
            {
                default: 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch));

                case ValueDataType.Boolean:
                    return this.boolVal; 

                case ValueDataType.Double: 
                    return QueryValueModel.Boolean(this.dblVal); 

                case ValueDataType.Sequence: 
                    return QueryValueModel.Boolean(this.sequence);

                case ValueDataType.String:
                    return QueryValueModel.Boolean(this.strVal); 

            } 
        } 

        internal double ToDouble() 
        {
            switch(this.type)
            {
                default: 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch));
 
                case ValueDataType.Boolean: 
                    return QueryValueModel.Double(this.boolVal);
 
                case ValueDataType.Double:
                    return this.dblVal;

                case ValueDataType.Sequence: 
                    return QueryValueModel.Double(this.sequence);
 
                case ValueDataType.String: 
                    return QueryValueModel.Double(this.strVal);
 
            }
        }

        public override string ToString() 
        {
            switch(this.type) 
            { 
                default:
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperCritical(new QueryProcessingException(QueryProcessingError.TypeMismatch)); 

                case ValueDataType.Boolean:
                    return QueryValueModel.String(this.boolVal);
 
                case ValueDataType.Double:
                    return QueryValueModel.String(this.dblVal); 
 
                case ValueDataType.Sequence:
                    return QueryValueModel.String(this.sequence); 

                case ValueDataType.String:
                    return this.strVal;
            } 
        }
 
        internal void Update(ProcessingContext context, bool val) 
        {
            if (ValueDataType.Sequence == this.type) 
            {
                context.ReleaseSequence(this.sequence);
            }
            this.Boolean = val; 
        }
 
        internal void Update(ProcessingContext context, double val) 
        {
            if (ValueDataType.Sequence == this.type) 
            {
                context.ReleaseSequence(this.sequence);
            }
            this.Double = val; 
        }
 
        internal void Update(ProcessingContext context, string val) 
        {
            if (ValueDataType.Sequence == this.type) 
            {
                context.ReleaseSequence(this.sequence);
            }
            this.String = val; 
        }
 
        internal void Update(ProcessingContext context, NodeSequence val) 
        {
            if (ValueDataType.Sequence == this.type) 
            {
                context.ReleaseSequence(this.sequence);
            }
            this.Sequence = val; 
        }
 
    } 
}

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