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# openvrml::script_node Class Reference

Inheritance diagram for openvrml::script_node:

[legend]
List of all members.

## Detailed Description

Represents a VRML Script node.

## Public Types

typedef std::map< std::string, field_value_ptr > | field_value_map_t
| A std::map that keys field values on their field name.
typedef boost::shared_ptr< eventout > | eventout_ptr
| Reference-counted smart pointer to an eventout.
typedef std::map< std::string, eventout_ptr > | eventout_map_t
| Map of eventout instances.

## Public Member Functions

| script_node (script_node_class &class_, const boost::shared_ptr< openvrml::scope > &scope, const node_interface_set &interfaces, const initial_value_map &initial_values) throw (unsupported_interface, std::bad_cast, std::bad_alloc, std::invalid_argument)
| Construct.
virtual | ~script_node () throw ()
| Destroy.
void | update (double current_time)
| Update the script_node for the current time.
const field_value_map_t & | field_value_map () const throw ()
| field value map.
const eventout_map_t & | eventout_map () const throw ()
| eventOut map.

## Private Types

typedef script_event_listener< sfbool > | sfbool_listener
| sfbool event listener.
typedef script_event_listener< sfcolor > | sfcolor_listener
| sfcolor event listener.
typedef script_event_listener< sffloat > | sffloat_listener
| sffloat event listener.
typedef script_event_listener< sfimage > | sfimage_listener
| sfimage event listener.
typedef script_event_listener< sfint32 > | sfint32_listener
| sfint32 event listener.
typedef script_event_listener< sfnode > | sfnode_listener
| sfnode event listener.
typedef script_event_listener< sfrotation > | sfrotation_listener
| sfrotation event listener.
typedef script_event_listener< sfstring > | sfstring_listener
| sfstring event listener.
typedef script_event_listener< sftime > | sftime_listener
| sftime event listener.
typedef script_event_listener< sfvec2f > | sfvec2f_listener
| sfvec2f event listener.
typedef script_event_listener< sfvec3f > | sfvec3f_listener
| sfvec3f event listener.
typedef script_event_listener< mfcolor > | mfcolor_listener
| mfcolor event listener.
typedef script_event_listener< mffloat > | mffloat_listener
| mffloat event listener.
typedef script_event_listener< mfint32 > | mfint32_listener
| mfint32 event listener.
typedef script_event_listener< mfnode > | mfnode_listener
| mfnode event listener.
typedef script_event_listener< mfrotation > | mfrotation_listener
| mfrotation event listener.
typedef script_event_listener< mfstring > | mfstring_listener
| mfstring event listener.
typedef script_event_listener< mftime > | mftime_listener
| mftime event listener.
typedef script_event_listener< mfvec2f > | mfvec2f_listener
| mfvec2f event listener.
typedef script_event_listener< mfvec3f > | mfvec3f_listener
| mfvec3f event listener.
typedef boost::shared_ptr< openvrml::event_listener > | event_listener_ptr
| Reference-counted smart pointer to an event_listener.
typedef std::map< std::string, event_listener_ptr > | event_listener_map_t
| Map of event listeners.

## Private Member Functions

script * | create_script ()
| Create a script object.
void | assign_with_self_ref_check (const sfnode &, sfnode &) const throw ()
| Special assignment function to take into account the fact that Script nodes can be self referential.
void | assign_with_self_ref_check (const mfnode &, mfnode &) const throw ()
| Special assignment function to take into account the fact that Script nodes can be self referential.
virtual script_node * | to_script () throw ()
| Return a pointer to this script_node.
virtual void | do_initialize (double timestamp) throw (std::bad_alloc)
| Initialize.
virtual const field_value & | do_field (const std::string &id) const throw (unsupported_interface)
| Get the value of a field.
virtual openvrml::event_listener & | do_event_listener (const std::string &id) throw (unsupported_interface)
| Get an event listener.
virtual openvrml::event_emitter & | do_event_emitter (const std::string &id) throw (unsupported_interface)
| Get an event emitter.
virtual void | do_shutdown (double timestamp) throw ()
| Called by node::shutdown.
virtual void | do_render_child (viewer &v, rendering_context context)
| render_child implementation.

## Static Private Member Functions

static const boost::shared_ptr< openvrml::event_listener > | create_listener (field_value::type_id type, const std::string &id, script_node &node) throw (std::bad_alloc)
| Create a Script node event listener.

## Private Attributes

script_node_type | type
| Type object for the script_node instance.
sfbool | direct_output
| directOutput field.
sfbool | must_evaluate
| mustEvaluate field.
set_url_listener_t | set_url_listener
| set_url eventIn handler.
mfstring | url_
| url exposedField.
mfstring_emitter | url_changed_emitter
| url_changed eventOut emitter.
field_value_map_t | field_value_map_
| Maps user-defined field names to their values.
event_listener_map_t | event_listener_map
| Map of event listeners.
eventout_map_t | eventout_map_
| Map of eventout instances.
script * | script_
| A pointer to a script object.
int | events_received
| A count of the number of events received since script_node::update was called.

## Friends

class | script
| Abstract base class for script runtimes.

## Classes

class | eventout
| An event_emitter along with the emitted value. More...
class | script_event_listener
| Event listener. More...
class | script_node_type
| Type objects for script_nodes. More...
class | set_url_listener_t
| set_url event listener. More...

## Member Typedef Documentation

openvrml::script_node::field_value_map_t

| A std::map that keys field values on their field name.

openvrml::script_node::eventout_ptr

| Reference-counted smart pointer to an eventout.

openvrml::script_node::eventout_map_t

| Map of eventout instances.

openvrml::script_node::sfbool_listener`[private]`

| sfbool event listener. For internal use only.

openvrml::script_node::sfcolor_listener`[private]`

| sfcolor event listener. For internal use only.

openvrml::script_node::sffloat_listener`[private]`

| sffloat event listener. For internal use only.

openvrml::script_node::sfimage_listener`[private]`

| sfimage event listener. For internal use only.

openvrml::script_node::sfint32_listener`[private]`

| sfint32 event listener. For internal use only.

openvrml::script_node::sfnode_listener`[private]`

| sfnode event listener. For internal use only.

openvrml::script_node::sfrotation_listener`[private]`

| sfrotation event listener. For internal use only.

openvrml::script_node::sfstring_listener`[private]`

| sfstring event listener. For internal use only.

openvrml::script_node::sftime_listener`[private]`

| sftime event listener. For internal use only.

openvrml::script_node::sfvec2f_listener`[private]`

| sfvec2f event listener. For internal use only.

openvrml::script_node::sfvec3f_listener`[private]`

| sfvec3f event listener. For internal use only.

openvrml::script_node::mfcolor_listener`[private]`

| mfcolor event listener. For internal use only.

openvrml::script_node::mffloat_listener`[private]`

| mffloat event listener. For internal use only.

openvrml::script_node::mfint32_listener`[private]`

| mfint32 event listener. For internal use only.

openvrml::script_node::mfnode_listener`[private]`

| mfnode event listener. For internal use only.

openvrml::script_node::mfrotation_listener`[private]`

| mfrotation event listener. For internal use only.

openvrml::script_node::mfstring_listener`[private]`

| mfstring event listener. For internal use only.

openvrml::script_node::mftime_listener`[private]`

| mftime event listener. For internal use only.

openvrml::script_node::mfvec2f_listener`[private]`

| mfvec2f event listener. For internal use only.

openvrml::script_node::mfvec3f_listener`[private]`

| mfvec3f event listener. For internal use only.

openvrml::script_node::event_listener_ptr`[private]`

| Reference-counted smart pointer to an event_listener. For internal use only.

openvrml::script_node::event_listener_map_t`[private]`

| Map of event listeners. For internal use only.

## Constructor & Destructor Documentation

openvrml::script_node::script_node | ( | script_node_class & | class_,
|  | const boost::shared_ptr< openvrml::scope > & | scope,
|  | const node_interface_set & | interfaces,
|  | const initial_value_map & | initial_values
| ) | throw (unsupported_interface, std::bad_cast, std::bad_alloc, std::invalid_argument)

Construct.

Unlike other concrete node types, which are always instantiated via `node_type::create_node`, the `script_node` constructor is called directly when creating a new `script_node` from scratch. However, a `script_node` can be duplicated (or "cloned") by calling `node_type::create_node` on `script_node::type` of a `script_node` instance. This provides a consistent interface for cloning any node, regardless of its type. OpenVRML uses this internally when instantiating `PROTO`s.

Parameters:

  | class_ | the `script_node_class`. Typically there is one `script_node_class` per browser instance.
  | scope | the `scope` to which the node should belong.
  | interfaces | a `node_interface_set` containing specifications of user-defined fields, eventIns, and eventOuts particular to the `script_node` instance.
  | initial_values | a map of initial values for fields of the `script_node`.

Exceptions:

  | unsupported_interface | if `initial_values` specifies a field that is not supported by the `script_node`.
  | std::bad_cast | if `initial_values` includes a field value that is the wrong type for the specified field.
  | std::bad_alloc | if memory allocation fails.

  std::invalid_argument

  if:
  - `interfaces` includes an exposedField specification.
  - `interfaces` includes an interface specification that duplicates an existing Script node interface.
  - `initial_values` is missing an initial value for a user-defined field in `interfaces`.

openvrml::script_node::~script_node | ( |  | ) | throw ()`[virtual]`

| Destroy.

## Member Function Documentation

const boost::shared_ptr< event_listener > openvrml::script_node::create_listener | ( | field_value::type_id | type,
|  | const std::string & | id,
|  | script_node & | node
| ) | throw (std::bad_alloc)`[static, private]`

Create a Script node event listener.

For internal use only.

Parameters:

  | type | the type of listener to create.
  | id | eventIn identifier.
  | node | the containing script_node.

Returns:
  a Script node event listener.

Exceptions:

  | std::bad_alloc | if memory allocation fails.

void openvrml::script_node::update | ( | double | current_time | ) |

Update the script_node for the current time.

Parameters:

  | current_time | the current time.

const script_node::field_value_map_t & openvrml::script_node::field_value_map | ( |  | ) | const throw ()`[inline]`

field value map.

Returns:
  the field value map.

const script_node::eventout_map_t & openvrml::script_node::eventout_map | ( |  | ) | const throw ()`[inline]`

eventOut map.

Returns:
  the eventOut map.

script * openvrml::script_node::create_script | ( |  | ) | `[private]`

Create a script object.

For internal use only.

Returns:
  a new script object.

void openvrml::script_node::assign_with_self_ref_check | ( | const sfnode & | inval,
|  | sfnode & | retval
| ) | const throw ()`[private]`

Special assignment function to take into account the fact that Script nodes can be self referential.

For internal use only.

"Undo" the refcounting appropriately: decrement the refcount on any self-references we acquire ownership of, and increment the refcount on any self-references for which ownership is relinquished.

Parameters:

  | inval | input sfnode.

Return values:

  | retval | output sfnode.

void openvrml::script_node::assign_with_self_ref_check | ( | const mfnode & | inval,
|  | mfnode & | retval
| ) | const throw ()`[private]`

Special assignment function to take into account the fact that Script nodes can be self referential.

For internal use only.

"Undo" the refcounting appropriately: decrement the refcount on any self-references we acquire ownership of, and increment the refcount on any self-references for which ownership is relinquished.

Parameters:

  | inval | input mfnode.

Return values:

  | retval | output mfnode.

script_node * openvrml::script_node::to_script | ( |  | ) | throw ()`[private, virtual]`

Return a pointer to this script_node.

For internal use only.

Returns:
  a pointer to this script_node.

Reimplemented from openvrml::node.

void openvrml::script_node::do_initialize | ( | double | timestamp | ) | throw (std::bad_alloc)`[private, virtual]`

Initialize.

Parameters:

  | timestamp | the current time.

Exceptions:

  | std::bad_alloc | if memory allocation fails.

Reimplemented from openvrml::node.

const field_value & openvrml::script_node::do_field | ( | const std::string & | id | ) | const throw (unsupported_interface)`[private, virtual]`

Get the value of a field.

Parameters:

  | id | the name of the field to get.

Returns:
  the value for field `id`.

Exceptions:

  | unsupported_interface | if the node has no field `id`.

Implements openvrml::node.

event_listener & openvrml::script_node::do_event_listener | ( | const std::string & | id | ) | throw (unsupported_interface)`[private, virtual]`

Get an event listener.

This method is called by node::event_listener. Subclasses must implement this method.

Parameters:

  | id | eventIn identifier.

Returns:
  the event listener.

Exceptions:

  | unsupported_interface | if the node has no eventIn `id`.

Implements openvrml::node.

event_emitter & openvrml::script_node::do_event_emitter | ( | const std::string & | id | ) | throw (unsupported_interface)`[private, virtual]`

Get an event emitter.

This method is called by node::event_emitter.

Parameters:

  | id | eventOut identifier.

Returns:
  the event emitter.

Exceptions:

  | unsupported_interface | if the node has no eventOut `id`.

Implements openvrml::node.

void openvrml::script_node::do_shutdown | ( | double | timestamp | ) | throw ()`[private, virtual]`

Called by node::shutdown.

Parameters:

  | timestamp | the current time.

Reimplemented from openvrml::node.

void openvrml::script_node::do_render_child | ( | viewer & | v,
|  | rendering_context | context
| ) | `[private, virtual]`

render_child implementation.

Parameters:

  | v | viewer implementation responsible for actually doing the drawing.
  | context | generic context argument; holds things like the accumulated modelview transform.

Reimplemented from openvrml::child_node.

## Friends And Related Function Documentation

class openvrml::script_node::script`[friend]`

| Abstract base class for script runtimes.

## Member Data Documentation

script_node::script_node_type openvrml::script_node::type`[private]`

Type object for the script_node instance.

For internal use only.

Script node node_types are significantly different from other node_types. While most node_types are shared by the node instances they spawn, the script_node_type is unique to a script_node instance, and it shares the script_node's lifetime. This reflects the fact that Script nodes in VRML get their functionality by the addition of fields, eventIns, and eventOuts on a per-instance basis.

For script_node instances, node::node_type is an alias for the script_node_type object.

sfbool openvrml::script_node::direct_output`[private]`

| directOutput field. For internal use only.

sfbool openvrml::script_node::must_evaluate`[private]`

| mustEvaluate field. For internal use only.

script_node::set_url_listener_t openvrml::script_node::set_url_listener`[private]`

| set_url eventIn handler. For internal use only.

mfstring openvrml::script_node::url_`[private]`

| url exposedField. For internal use only.

mfstring_emitter openvrml::script_node::url_changed_emitter`[private]`

| url_changed eventOut emitter. For internal use only.

script_node::field_value_map_t openvrml::script_node::field_value_map_`[private]`

| Maps user-defined field names to their values. For internal use only.

script_node::event_listener_map_t openvrml::script_node::event_listener_map`[private]`

| Map of event listeners. For internal use only.

script_node::eventout_map_t openvrml::script_node::eventout_map_`[private]`

| Map of eventout instances. For internal use only.

script * openvrml::script_node::script_`[private]`

| A pointer to a script object. For internal use only.

int openvrml::script_node::events_received`[private]`

| A count of the number of events received since script_node::update was called. For internal use only.