ConstNode.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Filter / ConstNode.cs / 1 / ConstNode.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

namespace System.Data { 
    using System;
    using System.Diagnostics;
    using System.Collections.Generic;
    using System.ComponentModel; 
    using System.Globalization;
 
    internal sealed class ConstNode : ExpressionNode { 
        internal readonly object val;
 
        internal ConstNode(DataTable table, ValueType type, object constant) : this(table, type, constant, true) {
        }

        internal ConstNode(DataTable table, ValueType type, object constant, bool fParseQuotes) : base(table) { 
            switch (type) {
                case ValueType.Null: 
                    this.val = DBNull.Value; 
                    break;
 
                case ValueType.Numeric:
                    this.val = SmallestNumeric(constant);
                    break;
                case ValueType.Decimal: 
                    this.val = SmallestDecimal(constant);
                    break; 
                case ValueType.Float: 
                    this.val = Convert.ToDouble(constant, NumberFormatInfo.InvariantInfo);
                    break; 

                case ValueType.Bool:
                    this.val = Convert.ToBoolean(constant, CultureInfo.InvariantCulture);
                    break; 

                case ValueType.Str: 
                    if (fParseQuotes) { 
                        // replace '' with one '
                        this.val = ((string)constant).Replace("''", "'"); 
                    }
                    else {
                        this.val = (string)constant;
                    } 
                    break;
 
                case ValueType.Date: 
                    this.val = DateTime.Parse((string)constant, CultureInfo.InvariantCulture);
                    break; 

                case ValueType.Object:
                    this.val = constant;
                    break; 

                default: 
                    Debug.Assert(false, "NYI"); 
                    goto case ValueType.Object;
            } 
        }

        internal override void Bind(DataTable table, List list) {
            BindTable(table); 
        }
 
        internal override object Eval() { 
            return val;
        } 

        internal override object Eval(DataRow row, DataRowVersion version) {
            return Eval();
        } 

        internal override object Eval(int[] recordNos) { 
            return Eval(); 
        }
 
        internal override bool IsConstant() {
            return true;
        }
 
        internal override bool IsTableConstant() {
            return true; 
        } 

        internal override bool HasLocalAggregate() { 
            return false;
        }
        internal override bool HasRemoteAggregate() {
            return false; 
        }
 
        internal override ExpressionNode Optimize() { 
            return this;
        } 

        private object SmallestDecimal(object constant) {
            if (null == constant) {
                return 0d; 
            }
            else { 
                string sval = (constant as string); 
                if (null != sval) {
                    decimal r12; 
                    if (Decimal.TryParse(sval, NumberStyles.Number, NumberFormatInfo.InvariantInfo, out r12)) {
                        return r12;
                    }
 
                    double r8;
                    if (Double.TryParse(sval, NumberStyles.Float| NumberStyles.AllowThousands, NumberFormatInfo.InvariantInfo, out r8)) { 
                        return r8; 
                    }
                } 
                else {
                    IConvertible convertible = (constant as IConvertible);
                    if (null != convertible) {
                        try { 
                            return convertible.ToDecimal(NumberFormatInfo.InvariantInfo);
                        } 
                        catch (System.ArgumentException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        } 
                        catch (System.FormatException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.InvalidCastException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        } 
                        catch (System.OverflowException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        } 
                        try {
                            return convertible.ToDouble(NumberFormatInfo.InvariantInfo);
                        }
                        catch (System.ArgumentException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        } 
                        catch (System.FormatException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        } 
                        catch (System.InvalidCastException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.OverflowException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        } 
                    } 
                }
            } 
            return constant;
        }

        private object SmallestNumeric(object constant) { 
            if (null == constant) {
                return (int)0; 
            } 
            else {
                string sval = (constant as string); 
                if (null != sval) {
                    int i4;
                    if (Int32.TryParse(sval, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out i4)) {
                        return i4; 
                    }
                    long i8; 
                    if (Int64.TryParse(sval, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out i8)) { 
                        return i8;
                    } 
                    double r8;
                    if (Double.TryParse(sval, NumberStyles.Float| NumberStyles.AllowThousands, NumberFormatInfo.InvariantInfo, out r8)) {
                        return r8;
                    } 
                }
                else { 
                    IConvertible convertible = (constant as IConvertible); 
                    if (null != convertible) {
                        try { 
                            return convertible.ToInt32(NumberFormatInfo.InvariantInfo);
                        }
                        catch (System.ArgumentException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e); 
                        }
                        catch (System.FormatException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e); 
                        }
                        catch (System.InvalidCastException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.OverflowException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e); 
                        }
 
                        try { 
                            return convertible.ToInt64(NumberFormatInfo.InvariantInfo);
                        } 
                        catch (System.ArgumentException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.FormatException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        } 
                        catch (System.InvalidCastException e) { 
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        } 
                        catch (System.OverflowException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
 
                        try {
                            return convertible.ToDouble(NumberFormatInfo.InvariantInfo); 
                        } 
                        catch (System.ArgumentException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e); 
                        }
                        catch (System.FormatException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        } 
                        catch (System.InvalidCastException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e); 
                        } 
                        catch (System.OverflowException e) {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e); 
                        }
                    }
                }
            } 
            return constant;
        } 
    } 
}

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

Source code for the .NET framework in C#

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