public override Expression GetExpression(object data, JsonPath currentPath, IExpressionBuilder serializer)
{
DataTable table = (DataTable) data;
ObjectExpression tableExpr = new ObjectExpression();
tableExpr.Add("TableName", serializer.Serialize(table.TableName, currentPath.Append("TableName")));
tableExpr.Add("Columns", GetColumnsExpression(table, currentPath.Append("Columns"), serializer));
tableExpr.Add("Rows", GetRowsExpression(table, currentPath, serializer));
return tableExpr;
}
public virtual void Visit(ObjectExpression expression)
{
OnObjectStart(expression);
Visit((ComplexExpressionBase)expression);
foreach (KeyValueExpression kv in expression.Properties)
{
kv.Accept(this);
}
OnObjectEnd(expression);
}
/// <summary>
/// Called on an object expression before the properties and constructor arguments are visited
/// </summary>
/// <param name="expression"></param>
public virtual void OnObjectStart(ObjectExpression expression)
{
}
/// <summary>
/// Called on an object expression after the properties and constructor arguments are visited
/// </summary>
/// <param name="expression"></param>
public virtual void OnObjectEnd(ObjectExpression expression)
{
}
/// <summary>
/// Serialize an object implementing IDictionary. The serialized data is similar to a regular
/// object, except that the keys of the dictionary are used instead of properties.
/// </summary>
/// <param name="data">the dictionary object</param>
/// <param name="currentPath">object's path</param>
/// <param name="serializer">the serializer instance, used to serialize keys and values</param>
public override Expression GetExpression(object data, JsonPath currentPath, IExpressionBuilder serializer)
{
IDictionary dictionary = (IDictionary)data;
Type itemType = typeof(object);
Type genericDictionary = null;
if ((genericDictionary = dictionary.GetType().GetInterface(typeof(IDictionary<,>).Name)) != null)
{
itemType = genericDictionary.GetGenericArguments()[1];
}
ObjectExpression expression = new ObjectExpression();
foreach (DictionaryEntry pair in dictionary)
{
//may not work in all cases
object value = pair.Value;
Expression valueExpr = serializer.Serialize(value, currentPath.Append(pair.Key.ToString()));
if (value != null && !ReflectionUtils.AreEquivalentTypes(value.GetType(), itemType))
{
valueExpr = new CastExpression(value.GetType(), valueExpr);
}
expression.Add(pair.Key.ToString(), valueExpr);
}
return expression;
}
protected virtual Expression GetColumnExpression(DataColumn dc, JsonPath jsonPath, IExpressionBuilder serializer)
{
ObjectExpression column = new ObjectExpression();
// just DataType and column for now
column.Add("DataType", serializer.Serialize(dc.DataType, jsonPath.Append("DataType")));
column.Add("ColumnName", serializer.Serialize(dc.ColumnName, jsonPath.Append("ColumnName")));
return column;
}
/// <summary>
/// Creates an json object expression from object data.
/// </summary>
/// <param name="data">the data to serialize</param>
/// <param name="currentPath">current path to the object</param>
/// <param name="serializer">serializer instance used to serialize key values</param>
/// <returns>json object expression</returns>
public override Expression GetExpression(object data, JsonPath currentPath, IExpressionBuilder serializer)
{
TypeData handler = Config.GetTypeHandler(data.GetType());
ObjectExpression expression = new ObjectExpression();
foreach (IPropertyData prop in handler.Properties)
{
GenerateItemExpression(data, currentPath, serializer, expression, prop);
}
return expression;
}
/// <summary>
/// Constructs a new instance of the object represented by the expression.
/// </summary>
/// <param name="expression">json object expression</param>
/// <param name="deserializer">deserializer for deserializing constructor arguments if any</param>
/// <returns>constructed, but unpopulated object</returns>
protected virtual object ConstructObject(ObjectExpression expression, IDeserializerHandler deserializer)
{
TypeData handler = Config.GetTypeHandler(expression.ResultType);
// set the default type if none set
if (expression.ConstructorArguments.Count > 0)
{
// old way expects parameters in the constructor list
ResolveConstructorTypes(Config, expression);
}
else
{
foreach (IPropertyData parameter in handler.ConstructorParameters)
{
int propLocation = expression.IndexOf(parameter.Alias);
if (propLocation >= 0)
{
Expression arg = expression.Properties[propLocation].ValueExpression;
arg.ResultType = parameter.PropertyType;
expression.ConstructorArguments.Add(arg);
expression.Properties.RemoveAt(propLocation);
}
else
{
expression.ConstructorArguments.Add(new NullExpression());
}
}
}
object[] args = new object[expression.ConstructorArguments.Count];
for (int i = 0; i < args.Length; i++)
{
Expression carg = expression.ConstructorArguments[i];
if (i < handler.ConstructorParameters.Count && handler.ConstructorParameters[i].HasConverter)
{
TypeConverterExpressionHandler converterHandler = (TypeConverterExpressionHandler)Config.ExpressionHandlers.Find(typeof(TypeConverterExpressionHandler));
args[i] = converterHandler.Evaluate(carg, deserializer, handler.ConstructorParameters[i].TypeConverter);
}
else
{
args[i] = deserializer.Evaluate(carg);
}
}
object result = handler.CreateInstance(args);
expression.OnObjectConstructed(result);
return result;
}
/// <summary>
/// Generates an expression for an item and adds it to the object
/// </summary>
/// <param name="data">the item being serialized</param>
/// <param name="currentPath">the current path to the object</param>
/// <param name="serializer">serializer instance</param>
/// <param name="expression">the object expression</param>
/// <param name="prop">the property being serialized</param>
protected virtual void GenerateItemExpression(object data, JsonPath currentPath, IExpressionBuilder serializer, ObjectExpression expression, IPropertyData prop)
{
object value = prop.GetValue(data);
if (!prop.ShouldWriteValue(this.Config, value))
return;
Expression valueExpr;
if (prop.HasConverter)
{
valueExpr = serializer.Serialize(value, currentPath.Append(prop.Alias), prop.TypeConverter);
}
else
{
valueExpr = serializer.Serialize(value, currentPath.Append(prop.Alias));
}
if (value != null && !ReflectionUtils.AreEquivalentTypes(value.GetType(), prop.PropertyType))
{
valueExpr = new CastExpression(value.GetType(), valueExpr);
}
expression.Add(prop.Alias, valueExpr);
}
/// <summary>
/// Resolves and updates the types of any constructor arguments
/// </summary>
/// <param name="context">serialization context</param>
/// <param name="expression">object expression</param>
protected static void ResolveConstructorTypes(IConfiguration config, ObjectExpression expression)
{
TypeData handler = config.GetTypeHandler(expression.ResultType);
Type[] definedTypes = GetConstructorParameterTypes(handler.ConstructorParameters);
CtorArgTypeResolver resolver = new CtorArgTypeResolver(expression, config, definedTypes);
Type[] resolvedTypes = resolver.ResolveTypes();
for (int i = 0; i < resolvedTypes.Length; i++)
{
if (resolvedTypes[i] != null)
expression.ConstructorArguments[i].ResultType = resolvedTypes[i];
}
}
public void VisitObject(ObjectExpression expression)
{
Visit(typeof(ComplexExpressionBase), expression);
if (_expr != null)
return; // found it
string key = _refID.Top;
foreach (KeyValueExpression exp in expression.Properties)
{
if (exp.Key == key)
{
Visit(exp);
return;
}
}
// if we get here we didn't find it
throw new Exception("Unable to resolve reference: " + _refID);
}
/// <summary>
/// Parses a javascript object
/// </summary>
/// <returns></returns>
private ObjectExpression ParseObject()
{
Token tok = ReadToken();
Debug.Assert(tok == LBraceToken);
ObjectExpression value = new ObjectExpression() { LineNumber = tok.linenumber, CharacterPosition = tok.position };
Expression item;
bool first = true;
while (ReadAhead(CommaToken, RBraceToken, new ExpressionMethod(ParseKeyValue), out item, ref first))
{
value.Add((KeyValueExpression)item);
}
return value;
}
/// <summary>
/// Parses a constructor expression
/// </summary>
/// <returns>complex expression</returns>
/// <example>
/// new MyType("arg1", "arg2")
/// new MyType("argA", "argB") { "argC": "C", "argD": "D" }
/// </example>
private Expression ParseConstructedObject()
{
Token tok = ReadToken(); // should be the new keyword
Debug.Assert(tok == NewToken);
Type t = ParseTypeSpecifier();
int line = tok.linenumber;
int pos = tok.position;
tok = ReadToken();
RequireToken(LParenToken, tok, "Missing constructor arguments");
Expression arg;
List<Expression> ConstructorArgs = new List<Expression>();
bool first = true;
while (ReadAhead(CommaToken, RParenToken, new ExpressionMethod(ParseExpression), out arg, ref first)) {
ConstructorArgs.Add(arg);
}
ComplexExpressionBase value = null;
if (PeekToken() == LSquareToken || PeekToken() == LBraceToken) {
value = (ComplexExpressionBase) ParseExpression();
} else {
value = new ObjectExpression();
}
value.ResultType = t;
value.ConstructorArguments = ConstructorArgs;
value.LineNumber = line;
value.CharacterPosition = pos;
// insert Cast to keep type from being overwritten
return new CastExpression(t,value);
}
public void Visit(ObjectExpression objExpr)
{
VisitComplex(objExpr);
foreach (KeyValueExpression item in objExpr.Properties)
Visit(item);
}