jsondom Class Reference

Inherits jsonsax, and dom.

Public Member Functions
	jsondom ()
	jsondom (bool stringcacheenabled)
virtual	~jsondom ()
virtual const char *	getType ()
bool	parse (input *in)
bool	parseFile (const char *filename)
bool	parseString (const char *string)
void	createRootNode ()
Public Member Functions inherited from jsonsax
	jsonsax ()
virtual	~jsonsax ()
Public Member Functions inherited from sax
	sax ()
virtual	~sax ()
void	setIgnoreHeaderLines (uint64_t lines)
uint64_t	getIgnoreHeaderLines ()
void	setIgnoreFooterLines (uint64_t lines)
uint64_t	getIgnoreFooterLines ()
const char *	getError ()
Public Member Functions inherited from object
virtual	~object ()
Public Member Functions inherited from dom
	dom ()
	dom (bool stringcacheenabled)
virtual	~dom ()
virtual domnode *	getRootNode ()
virtual domnode *	getNullNode ()
virtual ssize_t	writeFile (const char *filename, mode_t perms)
virtual ssize_t	writeFile (const char *filename, mode_t perms, bool indent)
virtual ssize_t	write ()
virtual ssize_t	write (bool indent)
virtual ssize_t	write (output *out)
virtual ssize_t	write (output *out, bool indent)
virtual ssize_t	writeXml ()
virtual ssize_t	writeXml (bool indent)
virtual ssize_t	writeXml (output *out)
virtual ssize_t	writeXml (output *out, bool indent)
bool	getStringCacheEnabled ()
Public Member Functions inherited from collection
	collection ()
	collection (collection &c)
collection &	operator= (collection &c)
virtual	~collection ()
virtual uint64_t	getCount ()=0
comparator *	getComparator ()
void	setComparator (comparator *newcomp)
virtual bool	isReadOnly ()
virtual bool	isBlockBased ()
virtual uint64_t	getBlockSize ()
virtual bool	isSequentialAccess ()
virtual void	setManageValues (bool manage)
virtual bool	getManageValues ()
virtual void	setManageArrayValues (bool manage)
virtual bool	getManageArrayValues ()
virtual void	setManageKeys (bool manage)
virtual bool	getManageKeys ()
virtual void	setManageArrayKeys (bool manage)
virtual bool	getManageArrayKeys ()
virtual bool	clear ()=0
virtual ssize_t	writeJson ()=0
virtual ssize_t	writeJson (bool indent)=0
virtual ssize_t	writeJson (output *out)=0
virtual ssize_t	writeJson (output *out, bool indent)=0

Protected Member Functions
virtual bool	objectStart ()
virtual bool	memberStart ()
virtual bool	memberName (const char *name)
virtual bool	valueStart ()
virtual bool	stringValue (const char *value)
virtual bool	numberValue (const char *value)
virtual bool	trueValue ()
virtual bool	falseValue ()
virtual bool	nullValue ()
virtual bool	arrayStart ()
virtual bool	arrayEnd ()
virtual bool	valueEnd ()
virtual bool	memberEnd ()
virtual bool	objectEnd ()

Detailed Description

The jsondom class implements a minimal JSON DOM parser.

It parses a file or string of JSON-formatted data and produces a dom tree representing the data. It creates an "r" element for the root, named elements for each object or array, and "v" elements for each array value. It adds a "t" attribute to each object, indicating the type: "o" for standard object, "a" for array, "s" for string, "n" for number, "t" for true, "f" for false, and "u" for null. It also adds a "v" attribute to each string or number object, containing the value.

For example, the following JSON:

{ string_object: "string value 1", number_object: 10, true_object: true, false_object: false, null_object: null, composite_object: { string_member: "string value", number_member: 10, true_member: true, false_member: false, null_member: null nested_composite_object: { string_member: "string value", number_member: 10, true_member: true, false_member: false, null_member: null } }, array_object: ["string value", 10, true, false, null] }

would produce the following dom tree:

<r t="o"> <string_object t="s" v="string value 1"> <number_object t="n" v="10"> <true_object t="t"> <false_object t="f"> <null_object t="u"> <composite_object t="o"> <string_member t="s" v="string value"> <number_member t="n" v="10"> <true_member t="t"> <false_member t="f"> <null_member t="u"> <nested_composite_object t="o"> <string_member t="s" v="string value"> <number_member t="n" v="10"> <true_member t="t"> <false_member t="f"> <null_member t="u"> <array_object t="a"> <v t="s" v="string value"> <v t="n" v="10"> <v t="t"> <v t="f"> <v t="u"> </array_object> </nested_composite_object> </composite_object> </r>

Constructor & Destructor Documentation

jsondom() [1/2]

jsondom::jsondom

(

)

Creates a new instance of the jsondom class.

jsondom() [2/2]

jsondom::jsondom

(

bool

stringcacheenabled

)

Creates a new instance of the jsondom class, allowing the user to enable or disable the "string cache" for this instance.

By default, as each domnode is added to the jsondom tree, tag and attribute names and values are stored in a string cache and pointers into the cache are assigned to each node. Reference counters are kept and the string is removed from the cache when no more nodes are using it. If the data is highly repetitive this conserves memory at the cost of speed.

If the string cache is disabled then memory is allocated in each domnode for names and values and freed when the domnode is freed. This is faster but uses much more memory.

~jsondom()

virtual jsondom::~jsondom ( )

virtual

Deletes this instance of the jsondom class.

Member Function Documentation

arrayEnd()

virtual bool jsondom::arrayEnd ( )

protectedvirtual

Gets called when an array end is parsed.

Reimplemented from jsonsax.

arrayStart()

virtual bool jsondom::arrayStart ( )

protectedvirtual

Gets called when an array start is parsed.

Reimplemented from jsonsax.

createRootNode()

void jsondom::createRootNode ( )

virtual

Creates a new root node. This is useful for building a tree from scratch.

Reimplemented from dom.

falseValue()

virtual bool jsondom::falseValue ( )

protectedvirtual

Gets called when a false value is parsed.

Reimplemented from jsonsax.

getType()

virtual const char* jsondom::getType ( )

virtual

Returns "jsondom".

Reimplemented from dom.

memberEnd()

virtual bool jsondom::memberEnd ( )

protectedvirtual

Gets called when a member end is parsed.

Reimplemented from jsonsax.

memberName()

virtual bool jsondom::memberName ( const char *  name )

protectedvirtual

Gets called when a member name is parsed.

Reimplemented from jsonsax.

memberStart()

virtual bool jsondom::memberStart ( )

protectedvirtual

Gets called when a member start is parsed.

Reimplemented from jsonsax.

nullValue()

virtual bool jsondom::nullValue ( )

protectedvirtual

Gets called when a null value is parsed.

Reimplemented from jsonsax.

numberValue()

virtual bool jsondom::numberValue ( const char *  value )

protectedvirtual

Gets called when a number value is parsed.

Reimplemented from jsonsax.

objectEnd()

virtual bool jsondom::objectEnd ( )

protectedvirtual

Gets called when an object end is parsed.

Reimplemented from jsonsax.

objectStart()

virtual bool jsondom::objectStart ( )

protectedvirtual

Gets called when an object start is parsed.

Reimplemented from jsonsax.

parse()

bool jsondom::parse ( input *  in )

virtual

Parses generic input "in" and generates a DOM tree.

Implements dom.

parseFile()

bool jsondom::parseFile ( const char *  filename )

virtual

Parses file "filename" and generates a DOM tree.

Implements dom.

parseString()

bool jsondom::parseString ( const char *  string )

virtual

Parses string "string" and generates a DOM tree.

Implements dom.

stringValue()

virtual bool jsondom::stringValue ( const char *  value )

protectedvirtual

Gets called when a string value is parsed.

Reimplemented from jsonsax.

trueValue()

virtual bool jsondom::trueValue ( )

protectedvirtual

Gets called when a true value is parsed.

Reimplemented from jsonsax.

valueEnd()

virtual bool jsondom::valueEnd ( )

protectedvirtual

Gets called when an value end is parsed.

Reimplemented from jsonsax.

valueStart()

virtual bool jsondom::valueStart ( )

protectedvirtual

Gets called when a value start is parsed.

Reimplemented from jsonsax.