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1 using System;
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2 using System.Collections.Generic;
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3 using System.Text;
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4
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5 namespace BLToolkit.Data.Sql
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6 {
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7 using Reflection.Extension;
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8
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9 public class JoinOn : IQueryElement, ICloneableElement
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10 {
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11 public JoinOn()
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12 {
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13 }
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14
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15 public JoinOn(string field, string otherField)
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16 {
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17 _field = field;
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18 _otherField = otherField;
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19 }
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20
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21 public JoinOn(string field, string otherField, string expression)
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22 {
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23 _field = field;
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24 _otherField = otherField;
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25 _expression = expression;
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26 }
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27
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28 public JoinOn(AttributeExtension ext)
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29 {
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30 _field = (string)ext["Field"];
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31 _otherField = (string)ext["OtherField"];
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32 _expression = (string)ext["Expression"];
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33 }
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34
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35 private string _field;
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36 public string Field { get { return _field; } set { _field = value; } }
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37
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38 private string _otherField;
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39 public string OtherField { get { return _otherField; } set { _otherField = value; } }
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40
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41 private string _expression;
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42 public string Expression { get { return _expression; } set { _expression = value; } }
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43
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44 #region IQueryElement Members
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45
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46 public QueryElementType ElementType { get { return QueryElementType.JoinOn; } }
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47
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48 StringBuilder IQueryElement.ToString(StringBuilder sb, Dictionary<IQueryElement,IQueryElement> dic)
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49 {
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50 return sb;
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51 }
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52
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53 #endregion
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54
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55 #region ICloneableElement Members
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56
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57 public ICloneableElement Clone(Dictionary<ICloneableElement, ICloneableElement> objectTree, Predicate<ICloneableElement> doClone)
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58 {
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59 if (!doClone(this))
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60 return this;
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61
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62 ICloneableElement clone;
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63
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64 if (!objectTree.TryGetValue(this, out clone))
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65 objectTree.Add(this, clone = new JoinOn(_field, _otherField, _expression));
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66
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67 return clone;
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68 }
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69
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70 #endregion
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71 }
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72 }
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