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QueryBuilder.cs
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QueryBuilder.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using Dapper.Extensions.Linq.Core;
using Dapper.Extensions.Linq.Core.Builder;
using Dapper.Extensions.Linq.Core.Enums;
using Dapper.Extensions.Linq.Core.Predicates;
using Dapper.Extensions.Linq.Predicates;
namespace Dapper.Extensions.Linq.Builder
{
public class QueryBuilder<T> : IQueryBuilder<T> where T : class, IEntity
{
private readonly PredicateGroup _predicateGroup;
public QueryBuilder(GroupOperator groupOperator)
{
_predicateGroup = new PredicateGroup
{
Operator = groupOperator,
Predicates = new List<IPredicate>()
};
}
private IQueryBuilder<T> Find<TValue>(Expression<Func<T, TValue>> expression, object value, Operator @operator, bool not)
{
var memberExpression = expression.Body as MemberExpression;
if (memberExpression == null || memberExpression.Expression.NodeType != ExpressionType.Parameter)
throw new InvalidOperationException("Doing something fancy?");
_predicateGroup.Predicates.Add(new FieldPredicate<T> { Not = not, Operator = @operator, PropertyName = memberExpression.Member.Name, Value = value });
return this;
}
public IQueryBuilder<T> Equals<TValue>(Expression<Func<T, TValue>> expression, TValue value) { return Find(expression, value, Operator.Eq, false); }
public IQueryBuilder<T> NotEquals<TValue>(Expression<Func<T, TValue>> expression, TValue value) { return Find(expression, value, Operator.Eq, true); }
public IQueryBuilder<T> LessThan<TValue>(Expression<Func<T, TValue>> expression, TValue value) { return Find(expression, value, Operator.Lt, false); }
public IQueryBuilder<T> GreaterThan<TValue>(Expression<Func<T, TValue>> expression, TValue value) { return Find(expression, value, Operator.Gt, false); }
public IQueryBuilder<T> In<TValue>(Expression<Func<T, TValue>> expression, params TValue[] values)
{
return Find(expression, values, Operator.Eq, false);
}
public IQueryBuilder<T> Like<TValue>(Expression<Func<T, TValue>> expression, TValue likeValue) { return Find(expression, likeValue, Operator.Like, false); }
public IQueryBuilder<T> SubQuery(IQueryBuilder<T> queryBuilder)
{
if (queryBuilder == null)
return this;
var predicateGroup = queryBuilder.GetPredicate();
if (predicateGroup == null)
return this;
if (_predicateGroup.Predicates == null)
_predicateGroup.Predicates = new List<IPredicate>();
_predicateGroup.Predicates.Add(predicateGroup);
return this;
}
public IPredicateGroup GetPredicate() { return _predicateGroup; }
public static IPredicateGroup FromExpression(Expression<Func<T, bool>> predicate)
{
if (predicate == null) return null;
return PredicateConverter.Convert(predicate);
}
private sealed class PredicateConverter
{
private PredicateConverter()
{
}
public static PredicateGroup Convert(Expression expression)
{
if (expression.NodeType == ExpressionType.Lambda)
expression = ((LambdaExpression)expression).Body;
var converter = new PredicateConverter();
var result = converter.Parse(expression);
var group = result as PredicateGroup;
if (group == null)
group = new PredicateGroup { Predicates = new List<IPredicate> { result } };
return group;
}
private IPredicate ParseGroup(BinaryExpression expression)
{
var group = new PredicateGroup { Predicates = new List<IPredicate>(2) };
switch (expression.NodeType)
{
case ExpressionType.AndAlso:
group.Operator = GroupOperator.And;
break;
case ExpressionType.OrElse:
group.Operator = GroupOperator.Or;
break;
default:
throw new NotImplementedException();
}
PredicateGroup g;
var left = this.Parse(expression.Left);
var right = this.Parse(expression.Right);
g = left as PredicateGroup;
if (g != null && g.Operator == group.Operator && g.Predicates != null)
{
foreach (var predicate in g.Predicates)
group.Predicates.Add(predicate);
}
else if (g == null || g.Predicates != null)
group.Predicates.Add(left);
g = right as PredicateGroup;
if (g != null && g.Operator == group.Operator && g.Predicates != null)
{
foreach (var predicate in g.Predicates)
group.Predicates.Add(predicate);
}
else if (g == null || g.Predicates != null)
group.Predicates.Add(right);
return group;
}
private IPredicate ParseField(BinaryExpression expression)
{
string propertyName;
Expression valueExpression;
if (TryGetField(expression.Left, out propertyName))
valueExpression = expression.Right;
else if (TryGetField(expression.Right, out propertyName))
valueExpression = expression.Left;
else
throw new NotImplementedException("Doing something fancy?");
object value;
if (valueExpression.NodeType == ExpressionType.Constant)
{
value = ((ConstantExpression)valueExpression).Value;
}
else
{
value = InvokeExpression(valueExpression);
}
switch (expression.NodeType)
{
case ExpressionType.Equal:
return new FieldPredicate<T> { Not = false, Operator = Operator.Eq, PropertyName = propertyName, Value = value };
case ExpressionType.NotEqual:
return new FieldPredicate<T> { Not = true, Operator = Operator.Eq, PropertyName = propertyName, Value = value };
case ExpressionType.LessThan:
return new FieldPredicate<T> { Not = false, Operator = Operator.Lt, PropertyName = propertyName, Value = value };
case ExpressionType.LessThanOrEqual:
return new FieldPredicate<T> { Not = false, Operator = Operator.Le, PropertyName = propertyName, Value = value };
case ExpressionType.GreaterThan:
return new FieldPredicate<T> { Not = false, Operator = Operator.Gt, PropertyName = propertyName, Value = value };
case ExpressionType.GreaterThanOrEqual:
return new FieldPredicate<T> { Not = false, Operator = Operator.Ge, PropertyName = propertyName, Value = value };
default:
throw new NotImplementedException();
}
}
private IPredicate ParseUnaryNot(UnaryExpression expression)
{
if (expression.NodeType != ExpressionType.Not)
throw new InvalidOperationException();
var predicate = this.Parse(expression.Operand);
return VisitPredicateTree(predicate, p =>
{
var g = p as PredicateGroup;
if (g != null)
{
g.Operator = g.Operator == GroupOperator.And ? GroupOperator.Or : GroupOperator.And;
return true;
}
var f = p as IFieldPredicate;
if (f != null)
{
f.Not = !f.Not;
return false;
}
throw new NotImplementedException();
});
}
private IPredicate Parse(Expression expression)
{
switch (expression.NodeType)
{
case ExpressionType.Not:
return this.ParseUnaryNot((UnaryExpression)expression);
case ExpressionType.GreaterThan:
case ExpressionType.GreaterThanOrEqual:
case ExpressionType.LessThan:
case ExpressionType.LessThanOrEqual:
case ExpressionType.NotEqual:
case ExpressionType.Equal:
return this.ParseField((BinaryExpression)expression);
case ExpressionType.OrElse:
case ExpressionType.AndAlso:
return this.ParseGroup((BinaryExpression)expression);
case ExpressionType.Call:
return this.ParseCall((MethodCallExpression)expression);
case ExpressionType.MemberAccess:
return this.ParseBoolMember((MemberExpression) expression);
case ExpressionType.Add:
case ExpressionType.AddAssign:
case ExpressionType.AddAssignChecked:
case ExpressionType.AddChecked:
case ExpressionType.And:
case ExpressionType.AndAssign:
case ExpressionType.ArrayIndex:
case ExpressionType.ArrayLength:
case ExpressionType.Assign:
case ExpressionType.Block:
case ExpressionType.Coalesce:
case ExpressionType.Conditional:
case ExpressionType.Convert:
case ExpressionType.ConvertChecked:
case ExpressionType.DebugInfo:
case ExpressionType.Decrement:
case ExpressionType.Default:
case ExpressionType.Divide:
case ExpressionType.DivideAssign:
case ExpressionType.Dynamic:
case ExpressionType.ExclusiveOr:
case ExpressionType.ExclusiveOrAssign:
case ExpressionType.Extension:
case ExpressionType.Goto:
case ExpressionType.Increment:
case ExpressionType.Index:
case ExpressionType.Invoke:
case ExpressionType.IsFalse:
case ExpressionType.IsTrue:
case ExpressionType.Label:
case ExpressionType.Lambda:
case ExpressionType.LeftShift:
case ExpressionType.LeftShiftAssign:
case ExpressionType.ListInit:
case ExpressionType.Loop:
case ExpressionType.MemberInit:
case ExpressionType.Modulo:
case ExpressionType.ModuloAssign:
case ExpressionType.Multiply:
case ExpressionType.MultiplyAssign:
case ExpressionType.MultiplyAssignChecked:
case ExpressionType.MultiplyChecked:
case ExpressionType.Negate:
case ExpressionType.NegateChecked:
case ExpressionType.New:
case ExpressionType.NewArrayBounds:
case ExpressionType.NewArrayInit:
case ExpressionType.OnesComplement:
case ExpressionType.Or:
case ExpressionType.OrAssign:
case ExpressionType.Parameter:
case ExpressionType.PostDecrementAssign:
case ExpressionType.PostIncrementAssign:
case ExpressionType.Power:
case ExpressionType.PowerAssign:
case ExpressionType.PreDecrementAssign:
case ExpressionType.PreIncrementAssign:
case ExpressionType.Quote:
case ExpressionType.RightShift:
case ExpressionType.RightShiftAssign:
case ExpressionType.RuntimeVariables:
case ExpressionType.Subtract:
case ExpressionType.SubtractAssign:
case ExpressionType.SubtractAssignChecked:
case ExpressionType.SubtractChecked:
case ExpressionType.Switch:
case ExpressionType.Throw:
case ExpressionType.Try:
case ExpressionType.TypeAs:
case ExpressionType.TypeEqual:
case ExpressionType.TypeIs:
case ExpressionType.UnaryPlus:
case ExpressionType.Unbox:
default:
throw new NotImplementedException();
// currently ignored, sometime later should think about fixing...
case ExpressionType.Constant:
return new PredicateGroup();
}
}
private IPredicate ParseBoolMember(MemberExpression expression)
{
if (expression.Type == typeof (bool))
{
var propertyName = expression.Member.Name;
return new FieldPredicate<T> { Not = false, Operator = Operator.Eq, PropertyName = propertyName, Value = true };
}
throw new NotImplementedException(expression.Type.ToString());
}
private IPredicate ParseCall(MethodCallExpression expression)
{
if (expression.Method.DeclaringType == typeof(QueryFunctions))
return ParseCallQueryFunction(expression);
if (expression.Method.DeclaringType == typeof(System.Linq.Enumerable))
return ParseCallEnumerableFunction(expression);
if (expression.Method.DeclaringType != null &&
expression.Method.DeclaringType.IsGenericType &&
expression.Method.DeclaringType.GetGenericTypeDefinition() == typeof(List<>))
return ParseCallListFunction(expression);
if (expression.Method.Name == "Contains")
return ParseCallContains(expression);
throw new NotImplementedException("ParseCall");
}
private IPredicate ParseCallQueryFunction(MethodCallExpression expression)
{
if (expression.Method.Name == "Like")
{
var patternExpression = expression.Arguments[0] as ConstantExpression;
var memberExpression = SimplifyExpression(expression.Arguments[1]) as MemberExpression;
if (patternExpression == null)
throw new NotImplementedException();
if (memberExpression == null || memberExpression.Expression.NodeType != ExpressionType.Parameter)
throw new NotImplementedException();
return new FieldPredicate<T> { Not = false, Operator = Operator.Like, PropertyName = memberExpression.Member.Name, Value = patternExpression.Value };
}
throw new NotImplementedException();
}
private IPredicate ParseCallContains(MethodCallExpression expression)
{
var patternExpression = expression.Arguments[0];
var memberExpression = expression.Object as MemberExpression;
object value = patternExpression.NodeType == ExpressionType.Constant ?
((ConstantExpression)patternExpression).Value :
InvokeExpression(patternExpression);
if (patternExpression == null)
throw new NotImplementedException();
if (memberExpression == null || memberExpression.Expression.NodeType != ExpressionType.Parameter)
throw new NotImplementedException();
return new FieldPredicate<T>
{
Not = false,
Operator = Operator.Like,
PropertyName = memberExpression.Member.Name,
Value = string.Format("%{0}%", value)
};
}
private IPredicate ParseCallEnumerableFunction(MethodCallExpression expression)
{
if (expression.Method.Name == "Contains")
{
var valueExpression = expression.Arguments[0] as MemberExpression;
var memberExpression = SimplifyExpression(expression.Arguments[1]) as MemberExpression;
if (valueExpression == null)
throw new NotImplementedException();
if (memberExpression == null)
throw new NotImplementedException();
string propertyName = Nullable.GetUnderlyingType(memberExpression.Expression.Type) == null ?
memberExpression.Member.Name :
((MemberExpression)memberExpression.Expression).Member.Name;
return new FieldPredicate<T> { Not = false, Operator = Operator.Eq, PropertyName = propertyName, Value = InvokeExpression(valueExpression) };
}
throw new NotImplementedException();
}
private IPredicate ParseCallListFunction(MethodCallExpression expression)
{
if (expression.Method.Name == "Contains")
{
var valueExpression = expression.Arguments[0] as MemberExpression;
var memberExpression = SimplifyExpression(expression.Object) as MemberExpression;
if (valueExpression == null)
throw new NotImplementedException();
if (memberExpression == null)
throw new NotImplementedException();
string propertyName = Nullable.GetUnderlyingType(valueExpression.Expression.Type) == null ?
valueExpression.Member.Name :
((MemberExpression)valueExpression.Expression).Member.Name;
return new FieldPredicate<T>
{
Operator = Operator.Eq,
PropertyName = propertyName,
Value = InvokeExpression(memberExpression)
};
}
throw new NotImplementedException();
}
}
private static IPredicate VisitPredicateTree(IPredicate predicate, Func<IPredicate, bool> callback)
{
if (!callback(predicate))
return predicate;
var group = (IPredicateGroup)predicate;
foreach (var p in group.Predicates)
VisitPredicateTree(p, callback);
return predicate;
}
private static Expression SimplifyExpression(Expression expression)
{
switch (expression.NodeType)
{
case ExpressionType.Convert:
return ((UnaryExpression)expression).Operand;
default:
return expression;
}
}
private static object InvokeExpression(Expression expression)
{
return Expression.Lambda<Func<object>>(Expression.Convert(expression, typeof(object))).Compile().Invoke();
}
private static bool TryGetField(Expression expression, out string name)
{
expression = SimplifyExpression(expression);
if (expression.NodeType == ExpressionType.MemberAccess)
{
var memberExpression = expression as MemberExpression;
if (memberExpression?.Expression?.NodeType == ExpressionType.Parameter)
{
name = memberExpression.Member.Name;
return true;
}
}
name = null;
return false;
}
}
}