/// <summary>
/// Initializes a new instance of the FilterBuildingExpressionVisitor
/// class.
/// </summary>
/// <param name="contractResolver">
/// The contract resolver to use to determine property
/// names from members used within expressions.
/// </param>
private FilterBuildingExpressionVisitor(MobileServiceContractResolver contractResolver)
: base()
{
Debug.Assert(contractResolver != null);
this.contractResolver = contractResolver;
}
/// <summary>
/// Translate an expression tree into a compiled OData query.
/// </summary>
/// <param name="expression">
/// The expression tree.
/// </param>
/// <param name="contractResolver">
/// The contract resolver used to determine property names from
/// members used within expressions.
/// </param>
/// <returns>
/// An OData query.
/// </returns>
public static QueryNode Compile(Expression expression, MobileServiceContractResolver contractResolver)
{
Arguments.IsNotNull(expression, nameof(expression));
Arguments.IsNotNull(contractResolver, nameof(contractResolver));
// Walk the expression tree and build the filter.
FilterBuildingExpressionVisitor visitor = new FilterBuildingExpressionVisitor(contractResolver);
visitor.Visit(expression);
QueryNode node = visitor.filterExpression.FirstOrDefault();
return(node);
}
/// <summary>
/// Translate an expression tree into a compiled OData query.
/// </summary>
/// <param name="expression">
/// The expression tree.
/// </param>
/// <param name="contractResolver">
/// The contract resolver used to determine property names from
/// members used within expressions.
/// </param>
/// <returns>
/// An OData query.
/// </returns>
public static QueryNode Compile(Expression expression, MobileServiceContractResolver contractResolver)
{
Debug.Assert(expression != null);
Debug.Assert(contractResolver != null);
// Walk the expression tree and build the filter.
FilterBuildingExpressionVisitor visitor = new FilterBuildingExpressionVisitor(contractResolver);
visitor.Visit(expression);
QueryNode node = visitor.filterExpression.FirstOrDefault();
return(node);
}
public void ResolveTableNameIsThreadSafe()
{
const int iterationCount = 100;
for (int i = 0; i < iterationCount; i++)
{
MobileServiceContractResolver contractResolver = new MobileServiceContractResolver();
Action resolveTableName = () => contractResolver.ResolveTableName(typeof(PocoType));
Task t1 = Task.Run(resolveTableName);
Task t2 = Task.Run(resolveTableName);
Task.WhenAll(t1, t2).Wait();
}
}
public void ResolveTableNameIsThreadSafe()
{
const int iterationCount = 100;
for (int i = 0; i < iterationCount; i++)
{
MobileServiceContractResolver contractResolver = new MobileServiceContractResolver();
Action resolveTableName = () => contractResolver.ResolveTableName(typeof(PocoType));
Task t1 = Task.Run(resolveTableName);
Task t2 = Task.Run(resolveTableName);
Task.WhenAll(t1, t2).Wait();
}
}
/// <summary>
/// Get the table member name referenced by an expression or return null.
/// </summary>
/// <param name="expression">
/// The expression to check.
/// </param>
/// <param name="contractResolver">
/// The contract resolver to use to determine property names from members used
/// within expressions.
/// </param>
/// <returns>
/// The table member name or null.
/// </returns>
public static string GetTableMemberName(Expression expression,
MobileServiceContractResolver contractResolver)
{
Arguments.IsNotNull(expression, nameof(expression));
Arguments.IsNotNull(contractResolver, nameof(contractResolver));
// Only parameter references are valid in a query (any other
// references should have been partially evaluated away)
if (expression is MemberExpression member &&
member.Expression != null &&
member.Expression.NodeType == ExpressionType.Parameter &&
member.Member != null)
{
// Lookup the Mobile Services name of the member and use that
JsonProperty property = contractResolver.ResolveProperty(member.Member);
return(property.PropertyName);
}
// Otherwise return null
return(null);
}
public void ResolveTableName()
{
MobileServiceContractResolver contractResolver = new MobileServiceContractResolver();
List<Tuple<Type, string>> testCases = new List<Tuple<Type, string>>() {
new Tuple<Type, string>(typeof(PocoType), "PocoType"),
new Tuple<Type, string>(typeof(DataContractType), "DataContractNameFromAttributeType"),
new Tuple<Type, string>(typeof(DataTableType), "NamedDataTableType"),
new Tuple<Type, string>(typeof(JsonContainerType), "NamedJsonContainerType"),
new Tuple<Type, string>(typeof(UnnamedJsonContainerType), "UnnamedJsonContainerType"),
};
foreach (var testCase in testCases)
{
var input = testCase.Item1;
string expected = testCase.Item2;
var actual = contractResolver.ResolveTableName(input);
Assert.AreEqual(actual, expected);
}
}
public void ResolveTableName()
{
MobileServiceContractResolver contractResolver = new MobileServiceContractResolver();
List <Tuple <Type, string> > testCases = new List <Tuple <Type, string> >()
{
new Tuple <Type, string>(typeof(PocoType), "PocoType"),
new Tuple <Type, string>(typeof(DataContractType), "DataContractNameFromAttributeType"),
new Tuple <Type, string>(typeof(DataTableType), "NamedDataTableType"),
new Tuple <Type, string>(typeof(JsonContainerType), "NamedJsonContainerType"),
new Tuple <Type, string>(typeof(UnnamedJsonContainerType), "UnnamedJsonContainerType"),
};
foreach (var testCase in testCases)
{
var input = testCase.Item1;
string expected = testCase.Item2;
var actual = contractResolver.ResolveTableName(input);
Assert.AreEqual(actual, expected);
}
}
/// <summary>
/// Initializes a new instance of the FilterBuildingExpressionVisitor
/// class.
/// </summary>
/// <param name="contractResolver">
/// The contract resolver to use to determine property
/// names from members used within expressions.
/// </param>
private FilterBuildingExpressionVisitor(MobileServiceContractResolver contractResolver)
: base()
{
Arguments.IsNotNull(contractResolver, nameof(contractResolver));
this.contractResolver = contractResolver;
}
/// <summary>
/// Get the table member name referenced by an expression or return null.
/// </summary>
/// <param name="expression">
/// The expression to check.
/// </param>
/// <param name="contractResolver">
/// The contract resolver to use to determine property names from members used
/// within expressions.
/// </param>
/// <returns>
/// The table member name or null.
/// </returns>
public static string GetTableMemberName(Expression expression,
MobileServiceContractResolver contractResolver)
{
Debug.Assert(expression != null);
Debug.Assert(contractResolver != null);
// Only parameter references are valid in a query (any other
// references should have been partially evaluated away)
MemberExpression member = expression as MemberExpression;
if (member != null &&
member.Expression != null &&
member.Expression.NodeType == ExpressionType.Parameter &&
member.Member != null)
{
// Lookup the Mobile Services name of the member and use that
JsonProperty property = contractResolver.ResolveProperty(member.Member);
return property.PropertyName;
}
// Otherwise return null
return null;
}
/// <summary>
/// Translate an expression tree into a compiled OData query.
/// </summary>
/// <param name="expression">
/// The expression tree.
/// </param>
/// <param name="contractResolver">
/// The contract resolver used to determine property names from
/// members used within expressions.
/// </param>
/// <returns>
/// An OData query.
/// </returns>
public static QueryNode Compile(Expression expression, MobileServiceContractResolver contractResolver)
{
Debug.Assert(expression != null);
Debug.Assert(contractResolver != null);
// Walk the expression tree and build the filter.
FilterBuildingExpressionVisitor visitor = new FilterBuildingExpressionVisitor(contractResolver);
visitor.Visit(expression);
QueryNode node = visitor.filterExpression.FirstOrDefault();
return node;
}
/// <summary>
/// Initializes a new instance of the FilterBuildingExpressionVisitor
/// class.
/// </summary>
/// <param name="contractResolver">
/// The contract resolver to use to determine property
/// names from members used within expressions.
/// </param>
private FilterBuildingExpressionVisitor(MobileServiceContractResolver contractResolver)
: base()
{
Debug.Assert(contractResolver != null);
this.contractResolver = contractResolver;
}
