public void CombineWithOtherCustomMappings(CustomMapping root, IEnumerable <CustomMapping> mappings)
{
lock (root)
{
foreach (var otherMapping in mappings)
{
foreach (var m in otherMapping.Members)
{
if (!root.Members.Contains(m))
{
var oldParams = otherMapping.ArgumentParameters.Select(p => p.Parameter).ToList();
var newParams = root.ArgumentParameters.Select(p => p.Parameter).ToList();
oldParams.Add(otherMapping.SourceParameter);
newParams.Add(root.SourceParameter);
var visitor = new ParameterVisitor(oldParams, newParams);
var member = new MemberExpressionTuple
{
Expression = visitor.Visit(m.Expression),
Member = m.Member
};
root.Members.Add(member);
}
}
}
}
}
public override IAsyncEnumerable <Object> Execute(Object dataContext, OeQueryContext queryContext)
{
Expression expression;
MethodCallExpression countExpression = null;
IQueryable entitySet = queryContext.EntitySetAdapter.GetEntitySet(dataContext);
if (base.QueryCache.AllowCache)
{
expression = GetFromCache(queryContext, (T)dataContext, base.QueryCache, out countExpression);
}
else
{
expression = queryContext.CreateExpression(new OeConstantToVariableVisitor());
expression = queryContext.TranslateSource(dataContext, expression);
expression = new ParameterVisitor().Visit(expression);
if (queryContext.IsQueryCount())
{
countExpression = queryContext.CreateCountExpression(expression);
}
}
IQueryable <Object> query = (IQueryable <Object>)entitySet.Provider.CreateQuery(expression);
IAsyncEnumerable <Object> asyncEnumerator = Infrastructure.AsyncEnumeratorHelper.ToAsyncEnumerable(query);
if (countExpression != null)
{
queryContext.TotalCountOfItems = entitySet.Provider.Execute <int>(countExpression);
}
return(asyncEnumerator);
}
private static Expression MakeLambda(Expression parameter, Expression predicate)
{
var resultParameterVisitor = new ParameterVisitor();
resultParameterVisitor.Visit(parameter);
var resultParameter = resultParameterVisitor.Parameter;
return Expression.Lambda(predicate, (ParameterExpression)resultParameter);
}
/// <summary> Expression building </summary>
private static Expression <Func <T, Boolean> > Create <T>(this Expression body, params ParameterExpression[] oldParams)
{
var parameter = Expression.Parameter(typeof(T));
var expression = new ParameterVisitor(parameter, oldParams).Visit(body);
return(Expression.Lambda <Func <T, Boolean> >(expression, parameter));
}
private static Expression CreateAnyAllExpression(
Expression left,
Expression right,
ParameterExpression sourceParameter,
IEnumerable <ParameterExpression> lambdaParameters,
MethodInfo anyAllMethod)
{
var genericFunc = typeof(Func <,>)
.MakeGenericType(
MethodProvider.GetIEnumerableImpl(left.Type).GetGenericArguments()[0],
typeof(bool));
var filteredParameters = new ParameterVisitor()
.GetParameters(right)
.Where(p => p.Name != sourceParameter.Name)
.ToArray();
if (!filteredParameters.Any())
{
filteredParameters = lambdaParameters.ToArray();
}
return(Expression.Call(
anyAllMethod,
left,
Expression.Lambda(genericFunc, right, filteredParameters)));
}
public override Db.OeAsyncEnumerator ExecuteEnumerator(Object dataContext, OeQueryContext queryContext, CancellationToken cancellationToken)
{
Expression expression;
MethodCallExpression countExpression = null;
IQueryable entitySet = queryContext.EntitySetAdapter.GetEntitySet(dataContext);
if (base.QueryCache.AllowCache)
{
expression = GetFromCache(queryContext, (T)dataContext, base.QueryCache, out countExpression);
}
else
{
expression = queryContext.CreateExpression(new OeConstantToVariableVisitor());
expression = queryContext.TranslateSource(dataContext, expression);
expression = new ParameterVisitor().Visit(expression);
if (queryContext.ODataUri.QueryCount.GetValueOrDefault())
{
countExpression = OeQueryContext.CreateCountExpression(expression);
}
}
IQueryable <Object> query = (IQueryable <Object>)entitySet.Provider.CreateQuery(expression);
Db.OeAsyncEnumerator asyncEnumerator = new Db.OeAsyncEnumeratorAdapter(query, cancellationToken);
if (countExpression != null)
{
asyncEnumerator.Count = entitySet.Provider.Execute <int>(countExpression);
}
return(asyncEnumerator);
}
public static IEnumerable <string> GetParameters(this ParseResult p)
{
var pv = new ParameterVisitor();
p.Script.Accept(pv);
return(pv.Parameters);
}
/// <summary>
/// 编织扩展
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="source"></param>
/// <returns></returns>
internal Expression <Func <TEntity, T> > Expand <T>(Expression <Func <TEntity, T> > source)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
var adjuster = new ParameterVisitor(node => source.Parameters.Single());
var adjustedExpandables =
from expandable in _expandables
select new
{
From = expandable.From(),
To = (adjuster.Visit(expandable.To()))
};
var propertyReplacer = new MemberVisitor(node =>
{
var query =
from expandable in adjustedExpandables
where (expandable.From == node.Member)
select expandable.To;
return(query.SingleOrDefault() ?? node);
});
return((Expression <Func <TEntity, T> >)propertyReplacer.Visit(source));
}
public static bool HasParameterExpression(this Expression self)
{
var constantVisitor = new ParameterVisitor();
constantVisitor.Visit(self);
return(constantVisitor.HasParameterExpression);
}
public Expression Process(Expression expression)
{
var paramVisitor = new ParameterVisitor(this.ParametersToReplace);
expression = paramVisitor.Visit(expression);
return expression;
}
public Expression Process(Expression expression)
{
var paramVisitor = new ParameterVisitor(this.ParametersToReplace);
expression = paramVisitor.Visit(expression);
return(expression);
}
public override TResult ExecuteScalar <TResult>(Object dataContext, OeParseUriContext parseUriContext)
{
IQueryable query = parseUriContext.EntitySetAdapter.GetEntitySet(dataContext);
Expression expression = parseUriContext.CreateExpression(query, new OeConstantToVariableVisitor());
expression = new ParameterVisitor().Visit(expression);
return(query.Provider.Execute <TResult>(expression));
}
private static Expression <Func <T, bool> > MakeLambda <T>(Expression parameter, Expression predicate)
{
var resultParameterVisitor = new ParameterVisitor();
resultParameterVisitor.Visit(parameter);
var resultParameter = resultParameterVisitor.Parameter;
return(Expression.Lambda <Func <T, bool> >(predicate, (ParameterExpression)resultParameter));
}
public override Expression Translate(ExpandedNavigationSelectItem item)
{
var segment = (NavigationPropertySegment)item.PathToNavigationProperty.LastSegment;
Expression expression = Translate(segment);
Type navigationItemType = expression.Type;
Type itemType = OeExpressionHelper.GetCollectionItemType(navigationItemType);
if (itemType != null)
{
var expressionBuilder = new OeExpressionBuilder(_model, itemType);
expression = expressionBuilder.ApplyFilter(expression, item.FilterOption);
expression = expressionBuilder.ApplyOrderBy(expression, item.OrderByOption);
var path = new ODataPath(_path.Union(item.PathToNavigationProperty));
expression = expressionBuilder.ApplySkip(expression, item.SkipOption, path);
expression = expressionBuilder.ApplyTake(expression, item.TopOption, path);
foreach (KeyValuePair <ConstantExpression, ConstantNode> constant in expressionBuilder.Constants)
{
_visitor.AddConstant(constant.Key, constant.Value);
}
}
Expression countExpression = null;
if (item.CountOption.GetValueOrDefault())
{
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(itemType);
countExpression = Expression.Call(countMethodInfo, expression);
}
if (item.SelectAndExpand.SelectedItems.Any())
{
var path = new ODataPath(_path.Union(item.PathToNavigationProperty));
var selectTranslator = new OeSelectTranslator(_visitor, path);
Expression nestedExpression = selectTranslator.CreateExpression(expression, item.SelectAndExpand, OeMetadataLevel.Minimal);
Type nestedType = OeExpressionHelper.GetCollectionItemType(nestedExpression.Type);
if (nestedType == null)
{
var visitor = new ParameterVisitor(selectTranslator._parameter, expression);
nestedExpression = visitor.Visit(nestedExpression);
nestedType = nestedExpression.Type;
}
_selectItemInfo.EntryFactory = selectTranslator.CreateNestedEntryFactory(nestedType, _selectItemInfo.EntitySet, _selectItemInfo.ResourceInfo);
expression = nestedExpression;
}
if (countExpression != null)
{
return(CreateNavigationLinkInfo(navigationItemType, expression, countExpression));
}
return(expression);
}
public static ParameterExpression GetParamaterFromExpression(Expression parameter)
{
var resultParameterVisitor = new ParameterVisitor();
resultParameterVisitor.Visit(parameter);
var resultParameter = resultParameterVisitor.Parameter as ParameterExpression;
return(resultParameter);
}
public static Expression <Func <TResult, bool> > WithParameter <TResult, TSource>(this Expression <Func <TSource, bool> > source, Expression <Func <TResult, TSource> > selector)
{
// Replace parameter with body of selector
var replaceParameter = new ParameterVisitor(source.Parameters, selector.Body);
// This will be the new body of the expression
var newExpressionBody = replaceParameter.Visit(source.Body);
return(Expression.Lambda <Func <TResult, bool> >(newExpressionBody, selector.Parameters));
}
private static Expression <T> Compose <T>(
this Expression <T> first,
Expression <T> second,
Func <Expression, Expression, Expression> merge)
{
var visitor = new ParameterVisitor(first.Parameters);
var expression = merge(visitor.Visit(first.Body) !, visitor.Visit(second.Body) !);
return(Expression.Lambda <T>(expression, first.Parameters));
}
protected override System.Linq.Expressions.Expression <System.Func <TEntity, bool> > CreateExpression()
{
var parameter = Expression_.Parameter(typeof(TEntity), "entity");
var replacer = new ParameterVisitor(node => parameter);
var leftBody = replacer.Visit(LeftSideSpecification.Expression.Body);
var rightBody = replacer.Visit(RightSideSpecification.Expression.Body);
var newBody = CreateBody(leftBody, rightBody);
return(Expression_.Lambda <Func <TEntity, bool> >(newBody, parameter));
}
public static LambdaExpression OrElse(
LambdaExpression x, LambdaExpression y)
{
var newY = new ParameterVisitor(y.Parameters, x.Parameters)
.VisitAndConvert(y.Body, "OrElse");
return(Expression.Lambda(
Expression.OrElse(x.Body, newY),
x.Parameters));
}
public override OeEntityAsyncEnumerator ExecuteEnumerator(Object dataContext, OeParseUriContext parseUriContext, CancellationToken cancellationToken)
{
IQueryable entitySet = parseUriContext.EntitySetAdapter.GetEntitySet(dataContext);
Expression expression = parseUriContext.CreateExpression(entitySet, new OeConstantToVariableVisitor());
expression = new ParameterVisitor().Visit(expression);
var query = (IQueryable <Object>)entitySet.Provider.CreateQuery(expression);
return(new OeEntityAsyncEnumeratorAdapter(query, cancellationToken));
}
public static Expression <Func <T, bool> > Or <T>(
Expression <Func <T, bool> > x, Expression <Func <T, bool> > y)
{
var newY = new ParameterVisitor(y.Parameters, x.Parameters)
.VisitAndConvert(y.Body, "Or");
return(Expression.Lambda <Func <T, bool> >(
Expression.Or(x.Body, newY),
x.Parameters));
}
public static LambdaExpression AndAlso(
LambdaExpression x, LambdaExpression y)
{
var newY = new ParameterVisitor(y.Parameters, x.Parameters)
.VisitAndConvert(y.Body, "AndAlso");
return(Expression.Lambda(
Expression.AndAlso(x.Body, newY),
x.Parameters));
}
public BasicFilterBase Convert(Expression exp)
{
var parameters = new ParameterVisitor().GetParameters(exp);
if (parameters.Count != 1)
{
throw new InvalidOperationException("İfade tek bir parametre içermeli!");
}
return(Visit(exp));
}
public static LambdaExpression BuildPredicateForSubQuery(Type parentType, Type propertyType, Expression parameter)
{
var resultParameterVisitor = new ParameterVisitor();
resultParameterVisitor.Visit(parameter);
var parentParameter = (ParameterExpression)resultParameterVisitor.Parameter;
var functionType = typeof(Func <,>).MakeGenericType(parentType, propertyType);
return(Expression.Lambda(functionType, parameter, parentParameter));
}
/// <summary>
/// Performs analysis and returns a list of problems detected
/// </summary>
/// <param name="ruleExecutionContext">Contains the schema model and model element to analyze</param>
/// <returns>
/// The problems detected by the rule in the given element
/// </returns>
public override IList <SqlRuleProblem> Analyze(SqlRuleExecutionContext ruleExecutionContext)
{
var problems = new List <SqlRuleProblem>();
var sqlObj = ruleExecutionContext.ModelElement;
if (sqlObj == null || sqlObj.IsWhiteListed())
{
return(problems);
}
var name = sqlObj.Name.GetName();
var fragment = ruleExecutionContext.ScriptFragment.GetFragment(typeof(CreateProcedureStatement));
if (fragment.ScriptTokenStream == null)
{
return(problems);
}
var parameterVisitor = new ParameterVisitor();
var selectVisitor = new SelectStatementVisitor();
fragment.Accept(parameterVisitor);
fragment.Accept(selectVisitor);
if (parameterVisitor.Count == 0 || selectVisitor.Count == 0)
{
return(problems);
}
var setVisitor = new SetVariableStatementVisitor();
fragment.Accept(setVisitor);
foreach (var param in parameterVisitor.Statements.Select(p => p.VariableName.Value))
{
var selectsUsingParam = selectVisitor.Statements.GetSelectsUsingParameterInWhere(param).ToList();
if (!selectsUsingParam.Any())
{
continue;
}
var selectStartLine = selectsUsingParam.FirstOrDefault()?.StartLine;
var getAssignmentSelects = selectVisitor.NotIgnoredStatements(RuleId)
.GetSelectsSettingParameterValue(param).Where(sel => sel.StartLine < selectStartLine);
var setStatements = setVisitor.NotIgnoredStatements(RuleId)
.Where(set => _comparer.Equals(set.Variable.Name, param) && set.StartLine < selectStartLine);
problems.AddRange(getAssignmentSelects.Select(x => new SqlRuleProblem(Message, sqlObj, x)));
problems.AddRange(setStatements.Select(x => new SqlRuleProblem(Message, sqlObj, x)));
}
return(problems);
}
internal static LambdaExpression Bind(Type sourceType, PropertyOrFieldInfo member, LambdaExpression conversion, LambdaExpression customMapping = null)
{
var parameterToReplace = conversion.Parameters.Single();
var newParameter = Expression.Parameter(sourceType, "p");
var accessMember = Expression.MakeMemberAccess(newParameter, member);
var visitor = new ParameterVisitor(parameterToReplace, accessMember);
var newBody= visitor.Visit(conversion.Body);
return Expression.Lambda(newBody, newParameter);
}
internal static LambdaExpression Bind(Type sourceType, PropertyOrFieldInfo member, LambdaExpression conversion, LambdaExpression customMapping = null)
{
var parameterToReplace = conversion.Parameters.Single();
var newParameter = Expression.Parameter(sourceType, "p");
var accessMember = Expression.MakeMemberAccess(newParameter, member);
var visitor = new ParameterVisitor(parameterToReplace, accessMember);
var newBody = visitor.Visit(conversion.Body);
return(Expression.Lambda(newBody, newParameter));
}
public void ShouldReplaceParameter()
{
Expression<Func<User, bool>> expr1 = user => user.Name == "name";
Expression<Func<User, bool>> expr2 = user => user.IsMale;
var parm1 = expr1.Parameters[0];
var parm2 = expr2.Parameters[0];
var visitor = new ParameterVisitor(parm2, parm1);
var body = visitor.Visit(expr2);
var lambda = Expression.Lambda(body, parm1);
Assert.Equal(parm1, lambda.Parameters[0]);
}
public override OeAsyncEnumerator ExecuteEnumerator(Object dataContext, OeQueryContext queryContext, CancellationToken cancellationToken)
{
IQueryable entitySet = queryContext.EntitySetAdapter.GetEntitySet(dataContext);
Expression expression = queryContext.CreateExpression(entitySet, new OeConstantToVariableVisitor(queryContext.SkipTokenParser != null));
expression = new ParameterVisitor().Visit(expression);
var query = (IQueryable <Object>)entitySet.Provider.CreateQuery(expression);
OeAsyncEnumerator asyncEnumerator = new OeAsyncEnumeratorAdapter(query, cancellationToken);
if (queryContext.CountExpression != null)
{
asyncEnumerator.Count = query.Provider.Execute <int>(queryContext.CountExpression);
}
return(asyncEnumerator);
}
public override TResult ExecuteScalar <TResult>(Object dataContext, OeQueryContext queryContext)
{
IQueryable query = queryContext.EntitySetAdapter.GetEntitySet(dataContext);
Expression expression;
if (base.QueryCache.AllowCache)
{
expression = GetFromCache(queryContext, (T)dataContext, base.QueryCache, out _);
}
else
{
expression = queryContext.CreateExpression(new OeConstantToVariableVisitor());
expression = queryContext.TranslateSource(dataContext, expression);
expression = new ParameterVisitor().Visit(expression);
}
return(query.Provider.Execute <TResult>(expression));
}
public void ShouldNotReplaceIfParameterIsDifferent()
{
Expression<Func<User, bool>> expr1 = user => user.Name == "name";
Expression<Func<User, bool>> expr2 = user => user.IsMale;
Expression<Func<User, bool>> expr3 = user => user.FavoriteNumber == 3;
var parm1 = expr1.Parameters[0];
var parm2 = expr2.Parameters[0];
var parm3 = expr3.Parameters[0];
var visitor = new ParameterVisitor(parm1, parm2);
var body = visitor.Visit(expr3);
var lambda = Expression.Lambda(body, parm3);
Assert.Equal(parm3, lambda.Parameters[0]);
}
private static Expression GetFromCache(OeQueryContext queryContext, T dbContext, Cache.OeQueryCache queryCache,
out MethodCallExpression countExpression)
{
Cache.OeCacheContext cacheContext = queryContext.CreateCacheContext();
Cache.OeQueryCacheItem queryCacheItem = queryCache.GetQuery(cacheContext);
Expression expression;
IReadOnlyList <Cache.OeQueryCacheDbParameterValue> parameterValues;
IQueryable query = queryContext.EntitySetAdapter.GetEntitySet(dbContext);
if (queryCacheItem == null)
{
var parameterVisitor = new OeConstantToParameterVisitor();
expression = queryContext.CreateExpression(parameterVisitor);
expression = new ParameterVisitor().Visit(expression);
countExpression = OeQueryContext.CreateCountExpression(expression);
queryCache.AddQuery(queryContext.CreateCacheContext(parameterVisitor.ConstantToParameterMapper), expression, countExpression,
queryContext.EntryFactory, queryContext.SkipTokenAccessors);
parameterValues = parameterVisitor.ParameterValues;
}
else
{
expression = (Expression)queryCacheItem.Query;
queryContext.EntryFactory = queryCacheItem.EntryFactory;
queryContext.SkipTokenAccessors = queryCacheItem.SkipTokenAccessors;
countExpression = queryCacheItem.CountExpression;
parameterValues = cacheContext.ParameterValues;
}
expression = new OeParameterToVariableVisitor().Translate(expression, parameterValues);
expression = queryContext.TranslateSource(dbContext, expression);
if (queryContext.ODataUri.QueryCount.GetValueOrDefault())
{
countExpression = (MethodCallExpression)queryContext.TranslateSource(dbContext, countExpression);
countExpression = (MethodCallExpression) new OeParameterToVariableVisitor().Translate(countExpression, parameterValues);
}
else
{
countExpression = null;
}
return(expression);
}
public Expression <Func <TEntity, bool> > And(Expression <Func <TEntity, bool> > leftExpression, Expression <Func <TEntity, bool> > rightExpression)
{
if (leftExpression == null)
{
return(rightExpression);
}
if (rightExpression == null)
{
return(leftExpression);
}
var newRightExpression = new ParameterVisitor(rightExpression.Parameters, leftExpression.Parameters).VisitAndConvert(rightExpression.Body, "And");
BinaryExpression andExpression = Expression.AndAlso(leftExpression.Body, newRightExpression);
return(Expression.Lambda <Func <TEntity, bool> >(andExpression, leftExpression.Parameters.Single()));
}
public Expression <Func <TEntity, bool> > Or(Expression <Func <TEntity, bool> > leftExpression, Expression <Func <TEntity, bool> > rightExpression)
{
if (leftExpression == null)
{
return(rightExpression);
}
if (rightExpression == null)
{
return(leftExpression);
}
var newRightExpression = new ParameterVisitor(rightExpression.Parameters, leftExpression.Parameters).VisitAndConvert(rightExpression.Body, "Or");
BinaryExpression orExpression = Expression.OrElse(leftExpression.Body, newRightExpression);
return(Expression.Lambda <Func <TEntity, bool> >(orExpression, leftExpression.Parameters.Single()));
}
private void BuildSimpleTypeMappingExpressions(ParameterExpression source, ParameterExpression destination, ProposedMemberMapping member, List<Expression> expressions, List<ParameterExpression> newParams, CustomMapping customMapping = null)
{
Expression sourceExpression = Expression.PropertyOrField(source, member.SourceMember.Name);
var destMember = Expression.PropertyOrField(destination, member.DestinationMember.Name);
BinaryExpression assignSourceToDest;
Expression customExpression;
if (customMapping != null && (customExpression = customMapping.GetExpressionForMember(member.DestinationMember)) != null)
{
var visitor = new ParameterVisitor(customMapping.Parameter, source);
customExpression = visitor.Visit(customExpression);
assignSourceToDest = Expression.Assign(destMember, customExpression);
}
else
{
assignSourceToDest = Expression.Assign(destMember, sourceExpression);
}
expressions.Add(assignSourceToDest);
}