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Array.h
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//
// Array.h
//
// $Id$
//
// Library: JSON
// Package: JSON
// Module: Array
//
// Definition of the Array class.
//
// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef JSON_Array_INCLUDED
#define JSON_Array_INCLUDED
#include "Poco/JSON/JSON.h"
#include "Poco/SharedPtr.h"
#include "Poco/Dynamic/Var.h"
#include <vector>
#include <sstream>
namespace Poco {
namespace JSON {
class Object;
class JSON_API Array
{
public:
typedef std::vector<Dynamic::Var> ValueVec;
typedef SharedPtr<Array> Ptr;
Array();
/// Default constructor
Array(const Array& copy);
/// Copy Constructor
virtual ~Array();
/// Destructor
ValueVec::const_iterator begin() const;
/// Returns iterator
ValueVec::const_iterator end() const;
/// Returns iterator
Dynamic::Var get(unsigned int index) const;
/// Retrieves an element. Will return an empty value
/// when the element doesn't exist.
Array::Ptr getArray(unsigned int index) const;
/// Retrieves an array. When the element is not
/// an array or doesn't exist, an empty SharedPtr is returned.
template<typename T>
T getElement(unsigned int index) const
/// Retrieves an element and tries to convert it to the
/// template type. The convert<T> method of
/// Dynamic is called which can also throw
/// exceptions for invalid values.
/// Note: This will not work for an array or an object.
{
Dynamic::Var value = get(index);
return value.convert<T>();
}
SharedPtr<Object> getObject(unsigned int index) const;
/// Retrieves an object. When the element is not
/// an object or doesn't exist, an empty SharedPtr is returned.
std::size_t size() const;
/// Returns the size of the array
bool isArray(unsigned int index) const;
/// Returns true when the element is an array
bool isNull(unsigned int index) const;
/// Returns true when the element is null or
/// when the element doesn't exist.
bool isObject(unsigned int index) const;
/// Returns true when the element is an object
template<typename T>
T optElement(unsigned int index, const T& def) const
/// Returns the element at the given index. When
/// the element is null, doesn't exist or can't
/// be converted to the given type, the default
/// value will be returned
{
T value = def;
if ( index < _values.size() )
{
try
{
value = _values[index].convert<T>();
}
catch(...)
{
// Default value is returned.
}
}
return value;
}
void add(const Dynamic::Var& value);
/// Add the given value to the array
void stringify(std::ostream& out, unsigned int indent = 0, int step = -1) const;
/// Prints the array to out. When indent has zero value,
/// the array will be printed without newline breaks and spaces between elements.
void remove(unsigned int index);
/// Removes the element on the given index.
private:
ValueVec _values;
};
inline Array::ValueVec::const_iterator Array::begin() const
{
return _values.begin();
}
inline Array::ValueVec::const_iterator Array::end() const
{
return _values.end();
}
inline std::size_t Array::size() const
{
return static_cast<std::size_t>(_values.size());
}
inline bool Array::isArray(unsigned int index) const
{
Dynamic::Var value = get(index);
return value.type() == typeid(Array::Ptr);
}
inline void Array::add(const Dynamic::Var& value)
{
_values.push_back(value);
}
inline void Array::remove(unsigned int index)
{
_values.erase(_values.begin() + index);
}
}} // Namespace Poco::JSON
namespace Poco {
namespace Dynamic {
template <>
class VarHolderImpl<JSON::Array::Ptr>: public VarHolder
{
public:
VarHolderImpl(const JSON::Array::Ptr& val): _val(val)
{
}
~VarHolderImpl()
{
}
const std::type_info& type() const
{
return typeid(JSON::Array::Ptr);
}
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.isNull() && _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::Ptr& 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::Ptr _val;
};
}} // namespace Poco::JSON
#endif // JSON_Array_INCLUDED