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1 using System;
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2 using System.Collections.Generic;
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3 using System.Diagnostics;
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4 using System.Text;
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5
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6 namespace BLToolkit.Data.Sql
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7 {
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8 [Serializable, DebuggerDisplay("SQL = {SqlText}")]
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9 public class SqlBinaryExpression : ISqlExpression
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10 {
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11 public SqlBinaryExpression(Type systemType, ISqlExpression expr1, string operation, ISqlExpression expr2, int precedence)
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12 {
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13 if (expr1 == null) throw new ArgumentNullException("expr1");
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14 if (operation == null) throw new ArgumentNullException("operation");
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15 if (expr2 == null) throw new ArgumentNullException("expr2");
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16
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17 Expr1 = expr1;
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18 Operation = operation;
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19 Expr2 = expr2;
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20 SystemType = systemType;
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21 Precedence = precedence;
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22 }
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23
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24 public SqlBinaryExpression(Type systemType, ISqlExpression expr1, string operation, ISqlExpression expr2)
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25 : this(systemType, expr1, operation, expr2, Sql.Precedence.Unknown)
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26 {
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27 }
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28
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29 public ISqlExpression Expr1 { get; internal set; }
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30 public string Operation { get; private set; }
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31 public ISqlExpression Expr2 { get; internal set; }
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32 public Type SystemType { get; private set; }
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33
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34 public int Precedence { get; private set; }
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35
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36 #region Overrides
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37
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38 public string SqlText { get { return ToString(); } }
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39
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40 #if OVERRIDETOSTRING
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41
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42 public override string ToString()
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43 {
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44 return ((IQueryElement)this).ToString(new StringBuilder(), new Dictionary<IQueryElement,IQueryElement>()).ToString();
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45 }
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46
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47 #endif
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48
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49 #endregion
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50
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51 #region ISqlExpressionWalkable Members
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52
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53 [Obsolete]
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54 ISqlExpression ISqlExpressionWalkable.Walk(bool skipColumns, Func<ISqlExpression,ISqlExpression> func)
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55 {
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56 Expr1 = Expr1.Walk(skipColumns, func);
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57 Expr2 = Expr2.Walk(skipColumns, func);
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58
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59 return func(this);
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60 }
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61
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62 #endregion
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63
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64 #region IEquatable<ISqlExpression> Members
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65
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66 bool IEquatable<ISqlExpression>.Equals(ISqlExpression other)
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67 {
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68 return Equals(other, SqlExpression.DefaultComparer);
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69 }
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70
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71 #endregion
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72
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73 #region ISqlExpression Members
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74
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75 public bool CanBeNull()
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76 {
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77 return Expr1.CanBeNull() || Expr2.CanBeNull();
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78 }
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79
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80 public bool Equals(ISqlExpression other, Func<ISqlExpression,ISqlExpression,bool> comparer)
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81 {
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82 if (this == other)
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83 return true;
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84
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85 var expr = other as SqlBinaryExpression;
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86
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87 return
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88 expr != null &&
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89 Operation == expr.Operation &&
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90 SystemType == expr.SystemType &&
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91 Expr1.Equals(expr.Expr1, comparer) &&
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92 Expr2.Equals(expr.Expr2, comparer) &&
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93 comparer(this, other);
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94 }
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95
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96 #endregion
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97
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98 #region ICloneableElement Members
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99
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100 public ICloneableElement Clone(Dictionary<ICloneableElement, ICloneableElement> objectTree, Predicate<ICloneableElement> doClone)
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101 {
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102 if (!doClone(this))
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103 return this;
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104
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105 ICloneableElement clone;
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106
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107 if (!objectTree.TryGetValue(this, out clone))
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108 {
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109 objectTree.Add(this, clone = new SqlBinaryExpression(
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110 SystemType,
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111 (ISqlExpression)Expr1.Clone(objectTree, doClone),
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112 Operation,
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113 (ISqlExpression)Expr2.Clone(objectTree, doClone),
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114 Precedence));
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115 }
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116
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117 return clone;
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118 }
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119
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120 #endregion
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121
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122 #region IQueryElement Members
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123
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124 public QueryElementType ElementType { get { return QueryElementType.SqlBinaryExpression; } }
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125
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126 StringBuilder IQueryElement.ToString(StringBuilder sb, Dictionary<IQueryElement,IQueryElement> dic)
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127 {
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128 Expr1
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129 .ToString(sb, dic)
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130 .Append(' ')
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131 .Append(Operation)
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132 .Append(' ');
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133
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134 return Expr2.ToString(sb, dic);
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135 }
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136
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137 #endregion
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138 }
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139 }
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