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1 using System;
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2 using System.Linq.Expressions;
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3
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4 namespace BLToolkit.Data.Linq.Builder
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5 {
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6 using BLToolkit.Linq;
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7
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8 class WhereBuilder : MethodCallBuilder
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9 {
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10 protected override bool CanBuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
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11 {
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12 return methodCall.IsQueryable("Where");
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13 }
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14
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15 protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
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16 {
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17 var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
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18 var condition = (LambdaExpression)methodCall.Arguments[1].Unwrap();
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19 var result = builder.BuildWhere(buildInfo.Parent, sequence, condition, true);
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20
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21 result.SetAlias(condition.Parameters[0].Name);
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22
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23 return result;
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24 }
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25
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26 protected override SequenceConvertInfo Convert(
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27 ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo, ParameterExpression param)
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28 {
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29 var predicate = (LambdaExpression)methodCall.Arguments[1].Unwrap();
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30 var info = builder.ConvertSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]), predicate.Parameters[0]);
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31
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32 if (info != null)
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33 {
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34 info.Expression = methodCall.Convert(ex => ConvertMethod(methodCall, 0, info, predicate.Parameters[0], ex));
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35
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36 if (param != null)
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37 {
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38 if (param.Type != info.Parameter.Type)
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39 param = Expression.Parameter(info.Parameter.Type, param.Name);
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40
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41 if (info.ExpressionsToReplace != null)
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42 foreach (var path in info.ExpressionsToReplace)
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43 {
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44 path.Path = path.Path.Convert(e => e == info.Parameter ? param : e);
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45 path.Expr = path.Expr.Convert(e => e == info.Parameter ? param : e);
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46 }
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47 }
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48
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49 info.Parameter = param;
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50
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51 return info;
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52 }
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53
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54 return null;
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55 }
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56 }
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57 }
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