fixed GH #99: JSON::Query an JSON::Object

- fixed GH #99: JSON::Query an JSON::Object
- swapped order of AnyCast(const Any&) and AnyCast(Any&) definitions

CHANGELOG

@@ -76,6 +76,7 @@ Release 1.5.2 (2013-06-xx)
 - fixed GH #185: Poco::NumberFormatter::format(double value, int precision) 
   ignore precision == 0
 - fixed GH #138: FreeBSD JSON tests fail
+- fixed GH #99: JSON::Query an JSON::Object
 
 
 Release 1.5.1 (2013-01-11)

Foundation/include/Poco/Any.h

@@ -533,23 +533,6 @@ const ValueType* AnyCast(const Any* operand)
 }
 
 
-template <typename ValueType>
-ValueType AnyCast(const Any& operand)
-	/// AnyCast operator used to extract a copy of the ValueType from an const Any&.
-	///
-	/// Example Usage: 
-	///	 MyType tmp = AnyCast<MyType>(anAny).
-	/// Will throw a BadCastException if the cast fails.
-	/// Dont use an AnyCast in combination with references, i.e. MyType& tmp = ... or const MyType& = ...
-	/// Some compilers will accept this code although a copy is returned. Use the RefAnyCast in
-	/// these cases.
-{
-	typedef typename TypeWrapper<ValueType>::TYPE NonRef;
-
-	return AnyCast<NonRef&>(const_cast<Any&>(operand));
-}
-
-
 template <typename ValueType>
 ValueType AnyCast(Any& operand)
 	/// AnyCast operator used to extract a copy of the ValueType from an Any&.
@@ -569,6 +552,23 @@ ValueType AnyCast(Any& operand)
 }
 
 
+template <typename ValueType>
+ValueType AnyCast(const Any& operand)
+	/// AnyCast operator used to extract a copy of the ValueType from an const Any&.
+	///
+	/// Example Usage: 
+	///	 MyType tmp = AnyCast<MyType>(anAny).
+	/// Will throw a BadCastException if the cast fails.
+	/// Dont use an AnyCast in combination with references, i.e. MyType& tmp = ... or const MyType& = ...
+	/// Some compilers will accept this code although a copy is returned. Use the RefAnyCast in
+	/// these cases.
+{
+	typedef typename TypeWrapper<ValueType>::TYPE NonRef;
+
+	return AnyCast<NonRef&>(const_cast<Any&>(operand));
+}
+
+
 template <typename ValueType>
 const ValueType& RefAnyCast(const Any & operand)
 	/// AnyCast operator used to return a const reference to the internal data. 

JSON/include/Poco/JSON/Array.h

@@ -186,6 +186,9 @@ public:
 	static Poco::Dynamic::Array makeArray(const JSON::Array::Ptr& arr);
 		/// Utility function for creation of array.
 
+	void clear();
+		/// Clears the contents of the array.
+
 private:
 	typedef SharedPtr<Poco::Dynamic::Array> ArrayPtr;
 
@@ -389,6 +392,145 @@ private:
 };
 
 
+template <>
+class VarHolderImpl<JSON::Array>: public VarHolder
+{
+public:
+	VarHolderImpl(const JSON::Array& val): _val(val)
+	{
+	}
+
+	~VarHolderImpl()
+	{
+	}
+
+	const std::type_info& type() const
+	{
+		return typeid(JSON::Array);
+	}
+
+	void convert(Int8&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(Int16&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(Int32&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(Int64&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(UInt8&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(UInt16&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(UInt32&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(UInt64&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(bool& value) const
+	{
+		value = _val.size() > 0;
+	}
+
+	void convert(float&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(double&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(char&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(std::string& s) const
+	{
+		std::ostringstream oss;
+		_val.stringify(oss, 2);
+		s = oss.str();
+	}
+
+	void convert(DateTime& /*val*/) const
+	{
+		throw BadCastException("Cannot convert Array to DateTime");
+	}
+
+	void convert(LocalDateTime& /*ldt*/) const
+	{
+		throw BadCastException("Cannot convert Array to LocalDateTime");
+	}
+
+	void convert(Timestamp& /*ts*/) const
+	{
+		throw BadCastException("Cannot convert Array to Timestamp");
+	}
+
+	VarHolder* clone(Placeholder<VarHolder>* pVarHolder = 0) const
+	{
+		return cloneHolder(pVarHolder, _val);
+	}
+
+	const JSON::Array& value() const
+	{
+		return _val;
+	}
+
+	bool isArray() const
+	{
+		return false;
+	}
+
+	bool isInteger() const
+	{
+		return false;
+	}
+
+	bool isSigned() const
+	{
+		return false;
+	}
+
+	bool isNumeric() const
+	{
+		return false;
+	}
+
+	bool isString() const
+	{
+		return false;
+	}
+
+private:
+	JSON::Array _val;
+};
+
+
 }} // namespace Poco::JSON
 
 

JSON/include/Poco/JSON/Object.h

@@ -206,6 +206,10 @@ public:
 	operator const Poco::DynamicStruct& () const;
 		/// Cast operator to Poco::DynamiStruct.
 
+	void clear();
+		/// Clears the contents of the object. Insertion order 
+		/// preservation property is left intact.
+
 private:
 	template <typename C>
 	void doStringify(const C& container, std::ostream& out, unsigned int indent, int step) const
@@ -472,6 +476,148 @@ private:
 };
 
 
+template <>
+class VarHolderImpl<JSON::Object>: public VarHolder
+{
+public:
+	VarHolderImpl(const JSON::Object& val): _val(val)
+	{
+	}
+
+	~VarHolderImpl()
+	{
+	}
+
+	const std::type_info& type() const
+	{
+		return typeid(JSON::Object);
+	}
+
+	void convert(Int8&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(Int16&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(Int32&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(Int64&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(UInt8&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(UInt16&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(UInt32&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(UInt64&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(bool& value) const
+	{
+		value = _val.size() > 0;
+	}
+
+	void convert(float&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(double&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(char&) const
+	{
+		throw BadCastException();
+	}
+
+	void convert(std::string& s) const
+	{
+		std::ostringstream oss;
+		_val.stringify(oss, 2);
+		s = oss.str();
+	}
+
+	void convert(DateTime& /*val*/) const
+	{
+		//TODO: val = _val;
+		throw NotImplementedException("Conversion not implemented: JSON:Object => DateTime");
+	}
+
+	void convert(LocalDateTime& /*ldt*/) const
+	{
+		//TODO: ldt = _val.timestamp();
+		throw NotImplementedException("Conversion not implemented: JSON:Object => LocalDateTime");
+	}
+
+	void convert(Timestamp& /*ts*/) const
+	{
+		//TODO: ts = _val.timestamp();
+		throw NotImplementedException("Conversion not implemented: JSON:Object => Timestamp");
+	}
+
+	VarHolder* clone(Placeholder<VarHolder>* pVarHolder = 0) const
+	{
+		return cloneHolder(pVarHolder, _val);
+	}
+
+	const JSON::Object& value() const
+	{
+		return _val;
+	}
+
+	bool isArray() const
+	{
+		return false;
+	}
+
+	bool isInteger() const
+	{
+		return false;
+	}
+
+	bool isSigned() const
+	{
+		return false;
+	}
+
+	bool isNumeric() const
+	{
+		return false;
+	}
+
+	bool isString() const
+	{
+		return false;
+	}
+
+private:
+	JSON::Object _val;
+};
+
+
 }} // namespace Poco::JSON
 
 

JSON/include/Poco/JSON/Query.h

@@ -53,18 +53,38 @@ class JSON_API Query
 {
 public:
 	Query(const Dynamic::Var& source);
-		/// Constructor. Pass the start object/array.
+		/// Constructor. Pass the start object/array or Ptr thereof.
+		/// Creating Query holding Ptr will typically result in faster
+		/// performance.
 
 	virtual ~Query();
 		/// Destructor
 
 	Object::Ptr findObject(const std::string& path) const;
-		/// Search for an object. When the object can't be found, an empty
-		/// SharedPtr is returned.
+		/// Search for an object. When the object can't be found, a zero Ptr
+		/// is returned; otherwise, a shared pointer to internally held object
+		/// is returned.
+		/// If object (as opposed to a pointer to object) is held
+		/// internally, a shared pointer to new (heap-allocated) Object is
+		/// returned; this may be expensive operation.
+
+	Object& findObject(const std::string& path, Object& obj) const;
+		/// Search for an object. If object is found, it is assigned to the
+		/// Object through the reference passed in. When the object can't be 
+		/// found, the provided Object is emptied and returned.
 
 	Array::Ptr findArray(const std::string& path) const;
-		/// Search for an array. When the array can't be found, an empty
-		/// SharedPtr is returned.
+		/// Search for an array. When the array can't be found, a zero Ptr
+		/// is returned; otherwise, a shared pointer to internally held array
+		/// is returned.
+		/// If array (as opposed to a pointer to array) is held
+		/// internally, a shared pointer to new (heap-allocated) Object is
+		/// returned; this may be expensive operation.
+
+	Array& findArray(const std::string& path, Array& obj) const;
+		/// Search for an array. If array is found, it is assigned to the
+		/// Object through the reference passed in. When the array can't be 
+		/// found, the provided Object is emptied and returned.
 
 	Dynamic::Var find(const std::string& path) const;
 		/// Searches a value

JSON/src/Array.cpp

@@ -222,4 +222,11 @@ Poco::Dynamic::Array Array::makeArray(const JSON::Array::Ptr& arr)
 }
 
 
+void Array::clear()
+{
+	_values.clear();
+	_pArray = 0;
+}
+
+
 } } // namespace Poco::JSON

JSON/src/Object.cpp

@@ -206,4 +206,12 @@ Object::operator const Poco::DynamicStruct& () const
 }
 
 
+void Object::clear()
+{
+	_values.clear();
+	_keys.clear();
+	_pStruct = 0;
+}
+
+
 } } // namespace Poco::JSON

JSON/src/Query.cpp

@@ -50,7 +50,6 @@ namespace JSON {
 
 Query::Query(const Var& source): _source(source)
 {
-
 }
 
 
@@ -61,24 +60,56 @@ Query::~Query()
 
 Object::Ptr Query::findObject(const std::string& path) const
 {
-	Object::Ptr obj;
 	Var result = find(path);
-	if ( result.type() == typeid(Object::Ptr) )
-	{
-		obj = result.extract<Object::Ptr>();
-	}
+
+	if (result.type() == typeid(Object::Ptr))
+		return result.extract<Object::Ptr>();
+	else if (result.type() == typeid(Object))
+		return new Object(result.extract<Object>());
+
+	return 0;
+}
+
+
+Object& Query::findObject(const std::string& path, Object& obj) const
+{
+	obj.clear();
+
+	Var result = find(path);
+
+	if (result.type() == typeid(Object::Ptr))
+		obj = *result.extract<Object::Ptr>();
+	else if (result.type() == typeid(Object))
+		obj = result.extract<Object>();
+	
 	return obj;
 }
 
 
 Array::Ptr Query::findArray(const std::string& path) const
 {
-	Array::Ptr arr;
 	Var result = find(path);
-	if ( result.type() == typeid(Array::Ptr) )
-	{
-		arr = result.extract<Array::Ptr>();
-	}
+
+	if (result.type() == typeid(Array::Ptr))
+		return result.extract<Array::Ptr>();
+	else if (result.type() == typeid(Array))
+		return new Array(result.extract<Array>());
+
+	return 0;
+}
+
+
+Array& Query::findArray(const std::string& path, Array& arr) const
+{
+	arr.clear();
+
+	Var result = find(path);
+
+	if (result.type() == typeid(Array::Ptr))
+		arr = *result.extract<Array::Ptr>();
+	else if (result.type() == typeid(Array))
+		arr = result.extract<Array>();
+	
 	return arr;
 }
 
@@ -89,16 +120,16 @@ Var Query::find(const std::string& path) const
 	StringTokenizer tokenizer(path, ".");
 	for(StringTokenizer::Iterator token = tokenizer.begin(); token != tokenizer.end(); token++)
 	{
-		if ( !result.isEmpty() )
+		if (!result.isEmpty())
 		{
 			std::vector<int> indexes;
 			RegularExpression::MatchVec matches;
 			int firstOffset = -1;
 			int offset = 0;
 			RegularExpression regex("\\[([0-9]+)\\]");
-			while(regex.match(*token, offset, matches) > 0 )
+			while(regex.match(*token, offset, matches) > 0)
 			{
-				if ( firstOffset == -1 )
+				if (firstOffset == -1)
 				{
 					firstOffset = static_cast<int>(matches[0].offset);
 				}
@@ -108,33 +139,40 @@ Var Query::find(const std::string& path) const
 			}
 
 			std::string name(*token);
-			if ( firstOffset != -1 )
+			if (firstOffset != -1)
 			{
 				name = name.substr(0, firstOffset);
 			}
 
-			if ( name.length() > 0 )
+			if (name.length() > 0)
 			{
-				if ( result.type() == typeid(Object::Ptr) )
+				if (result.type() == typeid(Object::Ptr))
 				{
 					Object::Ptr o = result.extract<Object::Ptr>();
 					result = o->get(name);
 				}
+				else if (result.type() == typeid(Object))
+				{
+					Object o = result.extract<Object>();
+					result = o.get(name);
+				}
 			}
 
-			if (!result.isEmpty()
-			 && !indexes.empty() )
+			if (!result.isEmpty() && !indexes.empty())
 			{
-				for(std::vector<int>::iterator it = indexes.begin(); it != indexes.end(); ++it )
+				for(std::vector<int>::iterator it = indexes.begin(); it != indexes.end(); ++it)
 				{
-					if ( result.type() == typeid(Array::Ptr) )
+					if (result.type() == typeid(Array::Ptr))
 					{
 						Array::Ptr array = result.extract<Array::Ptr>();
 						result = array->get(*it);
-						if ( result.isEmpty() )
-						{
-							break;
-						}
+						if (result.isEmpty()) break;
+					}
+					else if (result.type() == typeid(Array))
+					{
+						Array array = result.extract<Array>();
+						result = array.get(*it);
+						if (result.isEmpty()) break;
 					}
 				}
 			}

JSON/testsuite/src/JSONTest.cpp

@@ -1033,7 +1033,7 @@ void JSONTest::testOptValue()
 
 void JSONTest::testQuery()
 {
-	std::string json = "{ \"name\" : \"Franky\", \"children\" : [ \"Jonas\", \"Ellen\" ] }";
+	std::string json = "{ \"name\" : \"Franky\", \"children\" : [ \"Jonas\", \"Ellen\" ], \"address\": { \"street\": \"A Street\", \"number\": 123, \"city\":\"The City\"} }";
 	Parser parser;
 	Var result;
 
@@ -1059,6 +1059,43 @@ void JSONTest::testQuery()
 	assert (ds["children"].size() == 2);
 	assert (ds["children"][0] == "Jonas");
 	assert (ds["children"][1] == "Ellen");
+
+	Object::Ptr pAddress = query.findObject("address");
+	assert (pAddress->getValue<std::string>("street") == "A Street");
+	pAddress = query.findObject("bad address");
+	assert (pAddress.isNull());
+
+	Object address;
+	address.set("dummy", 123);
+	query.findObject("bad address", address);
+	assert (!address.has("dummy"));
+	Object& rAddress = query.findObject("address", address);
+	assert (rAddress.getValue<int>("number") == 123);
+
+	using Poco::JSON::Array;
+
+	Array::Ptr pChildren = query.findArray("children");
+	assert (pChildren->getElement<std::string>(0) == "Jonas");
+	pChildren = query.findArray("no children");
+	assert (pChildren.isNull());
+
+	Array children;
+	children.add("dummy");
+	query.findArray("no children", children);
+	assert (children.size() == 0);
+	Array& rChildren = query.findArray("children", children);
+	assert (rChildren.getElement<std::string>(1) == "Ellen");
+
+	Object::Ptr pObj = new Poco::JSON::Object;
+	pObj->set("Id", 22);
+
+	Query queryPointer(pObj);
+	Var idQueryPointer = queryPointer.find("Id");
+	assert(22 == idQueryPointer);
+
+	Query queryObj(*pObj);
+	Var idQueryObj = queryObj.find("Id");
+	assert (22 == idQueryObj);
 }