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1 using System;
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2 using System.Data;
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3 using System.Linq.Expressions;
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4
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5 namespace BLToolkit.Data.Linq.Builder
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6 {
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7 using Data.Sql;
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8
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9 public abstract class SequenceContextBase : IBuildContext
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10 {
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11 protected SequenceContextBase(IBuildContext parent, IBuildContext sequence, LambdaExpression lambda)
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12 {
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13 Parent = parent;
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14 Sequence = sequence;
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15 Builder = sequence.Builder;
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16 Lambda = lambda;
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17 SqlQuery = sequence.SqlQuery;
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18
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19 Sequence.Parent = this;
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20
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21 Builder.Contexts.Add(this);
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22 }
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23
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24 #if DEBUG
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25 [CLSCompliant(false)]
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26 public string _sqlQueryText { get { return SqlQuery == null ? "" : SqlQuery.SqlText; } }
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27 #endif
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28
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29 public IBuildContext Parent { get; set; }
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30 public IBuildContext Sequence { get; set; }
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31 public ExpressionBuilder Builder { get; set; }
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32 public LambdaExpression Lambda { get; set; }
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33 public SqlQuery SqlQuery { get; set; }
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34
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35 Expression IBuildContext.Expression { get { return Lambda; } }
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36
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37 public virtual void BuildQuery<T>(Query<T> query, ParameterExpression queryParameter)
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38 {
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39 var expr = BuildExpression(null, 0);
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40 var mapper = Builder.BuildMapper<T>(expr);
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41
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42 query.SetQuery(mapper.Compile());
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43 }
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44
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45 public abstract Expression BuildExpression(Expression expression, int level);
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46 public abstract SqlInfo[] ConvertToSql (Expression expression, int level, ConvertFlags flags);
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47 public abstract SqlInfo[] ConvertToIndex (Expression expression, int level, ConvertFlags flags);
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48 public abstract IsExpressionResult IsExpression (Expression expression, int level, RequestFor requestFlag);
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49 public abstract IBuildContext GetContext (Expression expression, int level, BuildInfo buildInfo);
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50
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51 public virtual int ConvertToParentIndex(int index, IBuildContext context)
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52 {
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53 return Parent == null ? index : Parent.ConvertToParentIndex(index, context);
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54 }
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55
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56 public virtual void SetAlias(string alias)
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57 {
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58 }
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59
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60 public virtual ISqlExpression GetSubQuery(IBuildContext context)
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61 {
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62 return null;
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63 }
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64
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65 protected bool IsSubQuery()
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66 {
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67 for (var p = Parent; p != null; p = p.Parent)
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68 if (p.IsExpression(null, 0, RequestFor.SubQuery).Result)
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69 return true;
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70 return false;
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71 }
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72 }
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73 }
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