Json::Value Class Reference

Represents a JSON value. More...

#include <value.h>

Classes
struct	CommentInfo
class	CZString
union	ValueHolder

Public Types
typedef UInt	ArrayIndex
typedef ValueConstIterator	const_iterator
typedef Json::Int	Int
typedef ValueIterator	iterator
typedef std::vector< std::string >	Members
typedef std::map< CZString, Value >	ObjectValues
typedef Json::UInt	UInt

Public Member Functions
Value &	append (const Value &value)
	Append value to array at the end. More...
bool	asBool () const
const char *	asCString () const
double	asDouble () const
Int	asInt () const
std::string	asString () const
UInt	asUInt () const
iterator	begin ()
const_iterator	begin () const
void	clear ()
int	compare (const Value &other)
bool	empty () const
	Return true if empty array, empty object, or null; otherwise, false. More...
iterator	end ()
const_iterator	end () const
Value	get (const char *key, const Value &defaultValue) const
	Return the member named key if it exist, defaultValue otherwise. More...
Value	get (const std::string &key, const Value &defaultValue) const
	Return the member named key if it exist, defaultValue otherwise. More...
Value	get (UInt index, const Value &defaultValue) const
std::string	getComment (CommentPlacement placement) const
	Include delimiters and embedded newlines. More...
Members	getMemberNames () const
	Return a list of the member names. More...
bool	hasComment (CommentPlacement placement) const
bool	isArray () const
bool	isBool () const
bool	isConvertibleTo (ValueType other) const
bool	isDouble () const
bool	isInt () const
bool	isIntegral () const
bool	isMember (const char *key) const
	Return true if the object has a member named key. More...
bool	isMember (const std::string &key) const
	Return true if the object has a member named key. More...
bool	isNull () const
bool	isNumeric () const
bool	isObject () const
bool	isString () const
bool	isUInt () const
bool	isValidIndex (UInt index) const
	Return true if index < size(). More...
bool	operator! () const
	Return isNull() More...
bool	operator!= (const Value &other) const
bool	operator< (const Value &other) const
bool	operator<= (const Value &other) const
Value &	operator= (const Value &other)
bool	operator== (const Value &other) const
bool	operator> (const Value &other) const
bool	operator>= (const Value &other) const
Value &	operator[] (const char *key)
	Access an object value by name, create a null member if it does not exist. More...
const Value &	operator[] (const char *key) const
	Access an object value by name, returns null if there is no member with that name. More...
Value &	operator[] (const StaticString &key)
	Access an object value by name, create a null member if it does not exist. More...
Value &	operator[] (const std::string &key)
	Access an object value by name, create a null member if it does not exist. More...
const Value &	operator[] (const std::string &key) const
	Access an object value by name, returns null if there is no member with that name. More...
Value &	operator[] (UInt index)
const Value &	operator[] (UInt index) const
Value	removeMember (const char *key)
	Remove and return the named member. More...
Value	removeMember (const std::string &key)
	Same as removeMember(const char*) More...
void	resize (UInt size)
void	setComment (const char *comment, CommentPlacement placement)
	Comments must be //... or /* ... *‍/. More...
void	setComment (const std::string &comment, CommentPlacement placement)
	Comments must be //... or /* ... *‍/. More...
UInt	size () const
	Number of values in array or object. More...
void	swap (Value &other)
std::string	toStyledString () const
ValueType	type () const
	Value (bool value)
	Value (const char *beginValue, const char *endValue)
	Value (const char *value)
	Value (const StaticString &value)
	Constructs a value from a static string. More...
	Value (const std::string &value)
	Value (const Value &other)
	Value (double value)
	Value (Int value)
	Value (UInt value)
	Value (ValueType type=nullValue)
	Create a default Value of the given type. More...
	~Value ()

Static Public Attributes
static const Int	maxInt
static const UInt	maxUInt
static const Int	minInt
static const Value	null

Private Member Functions
Value &	resolveReference (const char *key, bool isStatic)

Private Attributes
int	allocated_: 1
CommentInfo *	comments_
ValueType	type_: 8
union Json::Value::ValueHolder	value_

Friends
class	ValueIteratorBase

Detailed Description

Represents a JSON value.

This class is a discriminated union wrapper that can represents a:

• signed integer [range: Value::minInt - Value::maxInt]
• unsigned integer (range: 0 - Value::maxUInt)
• double
• UTF-8 string
• boolean
• 'null'
• an ordered list of Value
• collection of name/value pairs (javascript object)

The type of the held value is represented by a ValueType and can be obtained using type().

values of an objectValue or arrayValue can be accessed using operator[]() methods. Non const methods will automatically create the a nullValue element if it does not exist. The sequence of an arrayValue will be automatically resize and initialized with nullValue. resize() can be used to enlarge or truncate an arrayValue.

The get() methods can be used to obtanis default value in the case the required element does not exist.

It is possible to iterate over the list of a objectValue values using the getMemberNames() method.

Definition at line 99 of file value.h.

Member Typedef Documentation

ArrayIndex

typedef UInt Json::Value::ArrayIndex

Definition at line 111 of file value.h.

const_iterator

typedef ValueConstIterator Json::Value::const_iterator

Definition at line 108 of file value.h.

Int

typedef Json::Int Json::Value::Int

Definition at line 110 of file value.h.

iterator

typedef ValueIterator Json::Value::iterator

Definition at line 107 of file value.h.

Members

typedef std::vector<std::string> Json::Value::Members

Definition at line 106 of file value.h.

ObjectValues

typedef std::map<CZString, Value> Json::Value::ObjectValues

Definition at line 143 of file value.h.

UInt

typedef Json::UInt Json::Value::UInt

Definition at line 109 of file value.h.

Constructor & Destructor Documentation

Value() [1/10]

Json::Value::Value

(

ValueType

type = nullValue

)

Create a default Value of the given type.

This is a very useful constructor. To create an empty array, pass arrayValue. To create an empty object, pass objectValue. Another Value can then be set to this one by assignment. This is useful since clear() and resize() will not alter types.

Examples:

Json::Value null_value; // null
Json::Value arr_value(Json::arrayValue); // []
Json::Value obj_value(Json::objectValue); // {}

Value() [2/10]

Json::Value::Value

(

Int

value

)

Value() [3/10]

Json::Value::Value

(

UInt

value

)

Value() [4/10]

Json::Value::Value

(

double

value

)

Value() [5/10]

Json::Value::Value

(

const char *

value

)

Value() [6/10]

Json::Value::Value	(	const char *	beginValue,
		const char *	endValue
	)

Value() [7/10]

Json::Value::Value

(

const StaticString &

value

)

Constructs a value from a static string.

Like other value string constructor but do not duplicate the string for internal storage. The given string must remain alive after the call to this constructor. Example of usage:

Json::Value aValue( StaticString("some text") );

Value() [8/10]

Json::Value::Value

(

const std::string &

value

)

Value() [9/10]

Json::Value::Value

(

bool

value

)

Value() [10/10]

Json::Value::Value

(

const Value &

other

)

~Value()

Json::Value::~Value

(

)

Member Function Documentation

append()

Value& Json::Value::append

(

const Value &

value

)

Append value to array at the end.

Equivalent to jsonvalue[jsonvalue.size()] = value;

Referenced by diclist.diclist::add(), evf::EvFDaqDirector::checkTransferSystemPSet(), L1TriggerJSONMonitoring::globalEndLuminosityBlockSummary(), HLTriggerJSONMonitoring::globalEndLuminosityBlockSummary(), evf::FastMonitoringService::makeInputLegendaJson(), evf::FastMonitoringService::makeModuleLegendaJson(), evf::FastMonitoringService::makePathLegendaJson(), and jsoncollector::HistoJ< unsigned int >::toJsonValue().

asBool()

bool Json::Value::asBool

(

)

const

asCString()

const char* Json::Value::asCString

(

)

const

asDouble()

double Json::Value::asDouble

(

)

const

asInt()

Int Json::Value::asInt

(

)

const

Referenced by evf::EvFDaqDirector::readLastLSEntry().

asString()

std::string Json::Value::asString

(

)

const

asUInt()

UInt Json::Value::asUInt

(

)

const

begin() [1/2]

iterator Json::Value::begin

(

)

begin() [2/2]

const_iterator Json::Value::begin

(

)

const

Referenced by evf::EvFDaqDirector::getStreamDestinations().

clear()

void Json::Value::clear

(

)

Remove all object members and array elements.

Precondition

type() is arrayValue, objectValue, or nullValue

Postcondition

type() is unchanged

compare()

int Json::Value::compare

(

const Value &

other

)

empty()

bool Json::Value::empty

(

)

const

Return true if empty array, empty object, or null; otherwise, false.

end() [1/2]

iterator Json::Value::end

(

)

Referenced by Types.LuminosityBlockRange::cppID(), and Types.EventRange::cppID().

end() [2/2]

const_iterator Json::Value::end

(

)

const

Referenced by Types.LuminosityBlockRange::cppID(), Types.EventRange::cppID(), and evf::EvFDaqDirector::getStreamDestinations().

get() [1/3]

Value Json::Value::get	(	const char *	key,
		const Value &	defaultValue
	)		const

Return the member named key if it exist, defaultValue otherwise.

Referenced by Options.Options::__getitem__(), betterConfigParser.BetterConfigParser::__updateDict(), rrapi.RRApi::columns(), rrapi.RRApi::count(), rrapi.RRApi::data(), betterConfigParser.BetterConfigParser::getCompares(), betterConfigParser.BetterConfigParser::getGeneral(), betterConfigParser.BetterConfigParser::getResultingSection(), rrapi.RRApi::report(), rrapi.RRApi::reports(), rrapi.RRApi::tables(), rrapi.RRApi::tags(), rrapi.RRApi::templates(), and rrapi.RRApi::workspaces().

get() [2/3]

Value Json::Value::get	(	const std::string &	key,
		const Value &	defaultValue
	)		const

Return the member named key if it exist, defaultValue otherwise.

Referenced by Options.Options::__getitem__(), betterConfigParser.BetterConfigParser::__updateDict(), rrapi.RRApi::columns(), rrapi.RRApi::count(), rrapi.RRApi::data(), betterConfigParser.BetterConfigParser::getCompares(), betterConfigParser.BetterConfigParser::getGeneral(), betterConfigParser.BetterConfigParser::getResultingSection(), rrapi.RRApi::report(), rrapi.RRApi::reports(), rrapi.RRApi::tables(), rrapi.RRApi::tags(), rrapi.RRApi::templates(), and rrapi.RRApi::workspaces().

get() [3/3]

Value Json::Value::get	(	UInt	index,
		const Value &	defaultValue
	)		const

If the array contains at least index+1 elements, returns the element value, otherwise returns defaultValue.

Referenced by Options.Options::__getitem__(), betterConfigParser.BetterConfigParser::__updateDict(), rrapi.RRApi::columns(), rrapi.RRApi::count(), rrapi.RRApi::data(), betterConfigParser.BetterConfigParser::getCompares(), betterConfigParser.BetterConfigParser::getGeneral(), betterConfigParser.BetterConfigParser::getResultingSection(), evf::EvFDaqDirector::readLastLSEntry(), rrapi.RRApi::report(), rrapi.RRApi::reports(), rrapi.RRApi::tables(), rrapi.RRApi::tags(), rrapi.RRApi::templates(), and rrapi.RRApi::workspaces().

getComment()

std::string Json::Value::getComment

(

CommentPlacement

placement

)

const

Include delimiters and embedded newlines.

getMemberNames()

Members Json::Value::getMemberNames

(

)

const

Return a list of the member names.

If null, return an empty list.

Precondition

type() is objectValue or nullValue

Postcondition

if type() was nullValue, it remains nullValue

hasComment()

bool Json::Value::hasComment

(

CommentPlacement

placement

)

const

isArray()

bool Json::Value::isArray

(

)

const

isBool()

bool Json::Value::isBool

(

)

const

isConvertibleTo()

bool Json::Value::isConvertibleTo

(

ValueType

other

)

const

isDouble()

bool Json::Value::isDouble

(

)

const

isInt()

bool Json::Value::isInt

(

)

const

isIntegral()

bool Json::Value::isIntegral

(

)

const

isMember() [1/2]

bool Json::Value::isMember

(

const char *

key

)

const

Return true if the object has a member named key.

isMember() [2/2]

bool Json::Value::isMember

(

const std::string &

key

)

const

Return true if the object has a member named key.

isNull()

bool Json::Value::isNull

(

)

const

isNumeric()

bool Json::Value::isNumeric

(

)

const

isObject()

bool Json::Value::isObject

(

)

const

isString()

bool Json::Value::isString

(

)

const

isUInt()

bool Json::Value::isUInt

(

)

const

isValidIndex()

bool Json::Value::isValidIndex

(

UInt

index

)

const

Return true if index < size().

operator!()

bool Json::Value::operator!

(

)

const

Return isNull()

operator!=()

bool Json::Value::operator!=

(

const Value &

other

)

const

operator<()

bool Json::Value::operator<

(

const Value &

other

)

const

operator<=()

bool Json::Value::operator<=

(

const Value &

other

)

const

operator=()

Value& Json::Value::operator=

(

const Value &

other

)

operator==()

bool Json::Value::operator==

(

const Value &

other

)

const

operator>()

bool Json::Value::operator>

(

const Value &

other

)

const

operator>=()

bool Json::Value::operator>=

(

const Value &

other

)

const

operator[]() [1/7]

Value& Json::Value::operator[]

(

const char *

key

)

Access an object value by name, create a null member if it does not exist.

operator[]() [2/7]

const Value& Json::Value::operator[]

(

const char *

key

)

const

Access an object value by name, returns null if there is no member with that name.

operator[]() [3/7]

Value& Json::Value::operator[]

(

const StaticString &

key

)

Access an object value by name, create a null member if it does not exist.

If the object as no entry for that name, then the member name used to store the new entry is not duplicated. Example of use:

Json::Value object;
static const StaticString code("code");
object[code] = 1234;

operator[]() [4/7]

Value& Json::Value::operator[]

(

const std::string &

key

)

Access an object value by name, create a null member if it does not exist.

operator[]() [5/7]

const Value& Json::Value::operator[]

(

const std::string &

key

)

const

Access an object value by name, returns null if there is no member with that name.

operator[]() [6/7]

Value& Json::Value::operator[]

(

UInt

index

)

Access an array element (zero based index ). If the array contains less than index element, then null value are inserted in the array so that its size is index+1. (You may need to say 'value[0u]' to get your compiler to distinguish this from the operator[] which takes a string.)

operator[]() [7/7]

const Value& Json::Value::operator[]

(

UInt

index

)

const

Access an array element (zero based index ) (You may need to say 'value[0u]' to get your compiler to distinguish this from the operator[] which takes a string.)

removeMember() [1/2]

Value Json::Value::removeMember

(

const char *

key

)

Remove and return the named member.

Do nothing if it did not exist.

Returns

the removed Value, or null.

Precondition

type() is objectValue or nullValue

Postcondition

type() is unchanged

removeMember() [2/2]

Value Json::Value::removeMember

(

const std::string &

key

)

Same as removeMember(const char*)

resize()

void Json::Value::resize

(

UInt

size

)

Resize the array to size elements. New elements are initialized to null. May only be called on nullValue or arrayValue.

Precondition

type() is arrayValue or nullValue

Postcondition

type() is arrayValue

resolveReference()

Value& Json::Value::resolveReference ( const char *  key, bool  isStatic  )

private

setComment() [1/2]

void Json::Value::setComment	(	const char *	comment,
		CommentPlacement	placement
	)

Comments must be //... or /* ... *‍/.

Referenced by ConfigToolBase.ConfigToolBase::apply().

setComment() [2/2]

void Json::Value::setComment	(	const std::string &	comment,
		CommentPlacement	placement
	)

Comments must be //... or /* ... *‍/.

Referenced by ConfigToolBase.ConfigToolBase::apply().

size()

UInt Json::Value::size

(

)

const

Number of values in array or object.

Referenced by ntupleDataFormat._Collection::__iter__(), and ntupleDataFormat._Collection::__len__().

swap()

void Json::Value::swap

(

Value &

other

)

Swap values.

Note

Currently, comments are intentionally not swapped, for both logic and efficiency.

toStyledString()

std::string Json::Value::toStyledString

(

)

const

type()

ValueType Json::Value::type

(

)

const

Friends And Related Function Documentation

ValueIteratorBase

friend class ValueIteratorBase

friend

Definition at line 100 of file value.h.

Member Data Documentation

allocated_

int Json::Value::allocated_

private

Definition at line 401 of file value.h.

comments_

CommentInfo* Json::Value::comments_

private

Definition at line 406 of file value.h.

maxInt

const Int Json::Value::maxInt

static

Definition at line 115 of file value.h.

maxUInt

const UInt Json::Value::maxUInt

static

Definition at line 116 of file value.h.

minInt

const Int Json::Value::minInt

static

Definition at line 114 of file value.h.

null

const Value Json::Value::null

static

Definition at line 113 of file value.h.

type_

ValueType Json::Value::type_

private

Definition at line 400 of file value.h.

Referenced by Modules.Service::__str__(), Modules.Service::_placeImpl(), Modules.ESSource::_placeImpl(), Modules.ESProducer::_placeImpl(), Modules.ESPrefer::copy(), Mixins._TypedParameterizable::dumpPython(), Modules.ESPrefer::dumpPythonAs(), Modules.Service::dumpSequencePython(), RandomRunSource.RandomRunSource::insertInto(), Modules.Service::insertInto(), ExternalGeneratorFilter.ExternalGeneratorFilter::insertInto(), Mixins._TypedParameterizable::insertInto(), Modules.ESSource::moduleLabel_(), Modules.ESProducer::moduleLabel_(), Modules.ESSource::nameInProcessDesc_(), Modules.ESProducer::nameInProcessDesc_(), and Modules.ESPrefer::nameInProcessDesc_().

value_

union Json::Value::ValueHolder Json::Value::value_

private