private Expression GetPredicateBody(HttpRequestMessage request, ParameterExpression param)
{
Expression workingExpr = null;
var type = param.Type;
var queryPairs = request.GetQueryNameValuePairs();
foreach (var queryPair in queryPairs)
{
if (String.IsNullOrWhiteSpace(queryPair.Key))
{
continue;
}
var prop = _modelManager.GetPropertyForJsonKey(type, queryPair.Key);
if (prop != null)
{
var propertyType = prop.PropertyType;
var queryValue = queryPair.Value;
if (string.IsNullOrWhiteSpace(queryValue))
{
queryValue = null;
}
Expression expr = null;
if (propertyType == typeof(String))
{
if (String.IsNullOrWhiteSpace(queryValue))
{
Expression propertyExpr = Expression.Property(param, prop);
expr = Expression.Equal(propertyExpr, Expression.Constant(null));
}
else
{
Expression propertyExpr = Expression.Property(param, prop);
expr = Expression.Equal(propertyExpr, Expression.Constant(queryValue));
}
}
else if (propertyType == typeof(Boolean))
{
bool value;
expr = bool.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(Boolean?))
{
bool tmp;
var value = bool.TryParse(queryValue, out tmp) ? tmp : (bool?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(SByte))
{
SByte value;
expr = SByte.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(SByte?))
{
SByte tmp;
var value = SByte.TryParse(queryValue, out tmp) ? tmp : (SByte?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(Byte))
{
Byte value;
expr = Byte.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(Byte?))
{
Byte tmp;
var value = Byte.TryParse(queryValue, out tmp) ? tmp : (Byte?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(Int16))
{
Int16 value;
expr = Int16.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(Int16?))
{
Int16 tmp;
var value = Int16.TryParse(queryValue, out tmp) ? tmp : (Int16?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(UInt16))
{
UInt16 value;
expr = UInt16.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(UInt16?))
{
UInt16 tmp;
var value = UInt16.TryParse(queryValue, out tmp) ? tmp : (UInt16?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(Int32))
{
Int32 value;
expr = Int32.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(Int32?))
{
Int32 tmp;
var value = Int32.TryParse(queryValue, out tmp) ? tmp : (Int32?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(UInt32))
{
UInt32 value;
expr = UInt32.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(UInt32?))
{
UInt32 tmp;
var value = UInt32.TryParse(queryValue, out tmp) ? tmp : (UInt32?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(Int64))
{
Int64 value;
expr = Int64.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(Int64?))
{
Int64 tmp;
var value = Int64.TryParse(queryValue, out tmp) ? tmp : (Int64?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(UInt64))
{
UInt64 value;
expr = UInt64.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(UInt64?))
{
UInt64 tmp;
var value = UInt64.TryParse(queryValue, out tmp) ? tmp : (UInt64?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(Single))
{
Single value;
expr = Single.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(Single?))
{
Single tmp;
var value = Single.TryParse(queryValue, out tmp) ? tmp : (Single?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(Double))
{
Double value;
expr = Double.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(Double?))
{
Double tmp;
var value = Double.TryParse(queryValue, out tmp) ? tmp : (Double?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(Decimal))
{
Decimal value;
expr = Decimal.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(Decimal?))
{
Decimal tmp;
var value = Decimal.TryParse(queryValue, out tmp) ? tmp : (Decimal?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(DateTime))
{
DateTime value;
expr = DateTime.TryParse(queryValue, out value)
? GetPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(DateTime?))
{
DateTime tmp;
var value = DateTime.TryParse(queryValue, out tmp) ? tmp : (DateTime?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType == typeof(DateTimeOffset))
{
DateTimeOffset value;
expr = DateTimeOffset.TryParse(queryValue, out value)
? GetPropertyExpression <DateTimeOffset>(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType == typeof(DateTimeOffset?))
{
DateTimeOffset tmp;
var value = DateTimeOffset.TryParse(queryValue, out tmp) ? tmp : (DateTimeOffset?)null;
expr = GetPropertyExpression(value, prop, param);
}
else if (propertyType.IsEnum)
{
int value;
expr = (int.TryParse(queryValue, out value) && Enum.IsDefined(propertyType, value))
? GetEnumPropertyExpression(value, prop, param)
: Expression.Constant(false);
}
else if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(Nullable <>) &&
propertyType.GenericTypeArguments[0].IsEnum)
{
int tmp;
var value = int.TryParse(queryValue, out tmp) ? tmp : (int?)null;
expr = GetEnumPropertyExpression(value, prop, param);
}
else
{
// See if it is a relationship property
if (_modelManager.IsSerializedAsMany(propertyType))
{
var elementType = _modelManager.GetElementType(propertyType);
PropertyInfo relatedIdProperty;
try
{
relatedIdProperty = _modelManager.GetIdProperty(elementType);
}
catch (InvalidOperationException)
{
relatedIdProperty = null;
}
if (relatedIdProperty != null)
{
var propertyExpr = Expression.Property(param, prop);
if (string.IsNullOrWhiteSpace(queryValue))
{
var leftExpr = Expression.Equal(propertyExpr, Expression.Constant(null));
var asQueryableCallExpr = Expression.Call(
typeof(Queryable),
"AsQueryable",
new[] { elementType },
propertyExpr);
var anyCallExpr = Expression.Call(
typeof(Queryable),
"Any",
new[] { elementType },
asQueryableCallExpr);
var rightExpr = Expression.Not(anyCallExpr);
expr = Expression.OrElse(leftExpr, rightExpr);
}
else
{
var leftExpr = Expression.NotEqual(propertyExpr, Expression.Constant(null));
var idValue = queryValue.Trim();
var idExpr = Expression.Constant(idValue);
var anyParam = Expression.Parameter(elementType);
var relatedIdPropertyExpr = Expression.Property(anyParam, relatedIdProperty);
var relatedIdPropertyEqualsIdExpr = Expression.Equal(relatedIdPropertyExpr, idExpr);
var anyPredicateExpr = Expression.Lambda(relatedIdPropertyEqualsIdExpr, anyParam);
var asQueryableCallExpr = Expression.Call(
typeof(Queryable),
"AsQueryable",
new[] { elementType },
propertyExpr);
var rightExpr = Expression.Call(
typeof(Queryable),
"Any",
new[] { elementType },
asQueryableCallExpr,
anyPredicateExpr);
expr = Expression.AndAlso(leftExpr, rightExpr);
}
}
}
else
{
PropertyInfo relatedIdProperty;
try
{
relatedIdProperty = _modelManager.GetIdProperty(propertyType);
}
catch (InvalidOperationException)
{
relatedIdProperty = null;
}
if (relatedIdProperty != null)
{
var propertyExpr = Expression.Property(param, prop);
if (string.IsNullOrWhiteSpace(queryValue))
{
expr = Expression.Equal(propertyExpr, Expression.Constant(null));
}
else
{
var leftExpr = Expression.NotEqual(propertyExpr, Expression.Constant(null));
var idValue = queryValue.Trim();
var idExpr = Expression.Constant(idValue);
var relatedIdPropertyExpr = Expression.Property(propertyExpr, relatedIdProperty);
var rightExpr = Expression.Equal(relatedIdPropertyExpr, idExpr);
expr = Expression.AndAlso(leftExpr, rightExpr);
}
}
}
}
if (expr == null)
{
expr = Expression.Constant(true);
}
workingExpr = workingExpr == null ? expr : Expression.AndAlso(workingExpr, expr);
}
}
return(workingExpr ?? Expression.Constant(true)); // No filters, so return everything
}
private Type GetSingleType(Type type)//dynamic value = null)
{
return(_modelManager.IsSerializedAsMany(type) ? _modelManager.GetElementType(type) : type);
}
