//------------------------------------------------------------------------------
// <copyright file="ExpressionNode.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
// <owner current="false" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
 
namespace System.Data {
    using System;
    using System.Collections.Generic;
    using System.Data.Common;
    using System.Data.SqlTypes;
 
    internal abstract class ExpressionNode {
        private DataTable _table;
 
        protected ExpressionNode(DataTable table) {
            _table = table;
        }
 
        internal IFormatProvider FormatProvider {
            get {
                return ((null != _table) ? _table.FormatProvider : System.Globalization.CultureInfo.CurrentCulture);
            }
        }
 
        internal virtual bool IsSqlColumn{
            get{
                return false;
            }
        }
 
        protected DataTable table {
            get { return _table; }
        }
 
        protected void BindTable(DataTable table) {
            // when the expression is created, DataColumn may not be associated with a table yet
            _table = table;
        }
 
        internal abstract void Bind(DataTable table, List<DataColumn> list);
        internal abstract object Eval();
        internal abstract object Eval(DataRow row, DataRowVersion version);
        internal abstract object Eval(int[] recordNos);
        internal abstract bool IsConstant();
        internal abstract bool IsTableConstant();
        internal abstract bool HasLocalAggregate();
        internal abstract bool HasRemoteAggregate();
        internal abstract ExpressionNode Optimize();
        internal virtual bool DependsOn(DataColumn column) {
            return false;
        }
 
        internal static bool IsInteger(StorageType type) {
            return(type == StorageType.Int16 ||
                type == StorageType.Int32 ||
                type == StorageType.Int64 ||
                type == StorageType.UInt16 ||
                type == StorageType.UInt32 ||
                type == StorageType.UInt64 ||
                type == StorageType.SByte ||
                type == StorageType.Byte);
        }
 
        internal static bool IsIntegerSql(StorageType type) {
            return(type == StorageType.Int16 ||
                type == StorageType.Int32 ||
                type == StorageType.Int64 ||
                type == StorageType.UInt16 ||
                type == StorageType.UInt32 ||
                type == StorageType.UInt64 ||
                type == StorageType.SByte  ||
                type == StorageType.Byte ||
                type == StorageType.SqlInt64 ||
                type == StorageType.SqlInt32 ||
                type == StorageType.SqlInt16 ||
                type == StorageType.SqlByte);
        }
 
        internal static bool IsSigned(StorageType type) {
            return(type == StorageType.Int16 ||
                type == StorageType.Int32 ||
                type == StorageType.Int64 ||
                type == StorageType.SByte ||
                IsFloat(type));
        }
 
        internal static bool IsSignedSql(StorageType type) {
            return(type == StorageType.Int16 || // IsSigned(type)
                type == StorageType.Int32 ||
                type == StorageType.Int64 ||
                type == StorageType.SByte ||
                type == StorageType.SqlInt64 ||
                type == StorageType.SqlInt32 ||
                type == StorageType.SqlInt16 ||
                IsFloatSql(type));
        }
 
        internal static bool IsUnsigned(StorageType type) {
            return(type == StorageType.UInt16 ||
                   type == StorageType.UInt32 ||
                   type == StorageType.UInt64 ||
                   type == StorageType.Byte);
        }
 
        internal static bool IsUnsignedSql(StorageType type) {
            return(type == StorageType.UInt16 ||
                   type == StorageType.UInt32 ||
                   type == StorageType.UInt64 ||
                   type == StorageType.SqlByte ||// SqlByte represents an 8-bit unsigned integer, in the range of 0 through 255,
                   type == StorageType.Byte);
        }
 
        internal static bool IsNumeric(StorageType type) {
            return(IsFloat(type) ||
                   IsInteger(type));
        }
 
        internal static bool IsNumericSql(StorageType type) {
            return(IsFloatSql(type) ||
                   IsIntegerSql(type));
        }
 
        internal static bool IsFloat(StorageType type) {
            return(type == StorageType.Single ||
                type == StorageType.Double ||
                type == StorageType.Decimal);
        }
 
        internal static bool IsFloatSql(StorageType type) {
            return(type == StorageType.Single ||
                type == StorageType.Double ||
                type == StorageType.Decimal ||
                type == StorageType.SqlDouble ||
                type == StorageType.SqlDecimal || // I expect decimal to be Integer!
                type == StorageType.SqlMoney ||   // if decimal is here, this should be definitely here!
                type == StorageType.SqlSingle);
        }
 
    }
}