Module jdk.scripting.nashorn

Package jdk.nashorn.api.scripting

Class AbstractJSObject

java.lang.Object

jdk.nashorn.api.scripting.AbstractJSObject

All Implemented Interfaces:

JSObject

Direct Known Subclasses:

ScriptObjectMirror

public abstract class AbstractJSObject
extends Object
implements JSObject

This is the base class for nashorn ScriptObjectMirror class. This class can also be subclassed by an arbitrary Java class. Nashorn will treat objects of such classes just like nashorn script objects. Usual nashorn operations like obj[i], obj.foo, obj.func(), delete obj.foo will be delegated to appropriate method call of this class.

Since:

1.8u40

Constructor Summary

Constructors

Constructor	Description
AbstractJSObject()	The default constructor.

Method Summary

Modifier and Type	Method	Description
Object	call(Object thiz, Object... args)	Call this object as a JavaScript function.
Object	eval(String s)	Evaluate a JavaScript expression.
String	getClassName()	ECMA [[Class]] property
static Object	getDefaultValue(JSObject jsobj, Class<?> hint)	Deprecated. use JSObject.getDefaultValue(Class) instead.
Object	getMember(String name)	Retrieves a named member of this JavaScript object.
Object	getSlot(int index)	Retrieves an indexed member of this JavaScript object.
boolean	hasMember(String name)	Does this object have a named member?
boolean	hasSlot(int slot)	Does this object have a indexed property?
boolean	isArray()	Is this an array object?
boolean	isFunction()	Is this a function object?
boolean	isInstance(Object instance)	Checking whether the given object is an instance of 'this' object.
boolean	isInstanceOf(Object clazz)	Checking whether this object is an instance of the given 'clazz' object.
boolean	isStrictFunction()	Is this a 'use strict' function object?
Set<String>	keySet()	Returns the set of all property names of this object.
Object	newObject(Object... args)	Call this 'constructor' JavaScript function to create a new object.
void	removeMember(String name)	Remove a named member from this JavaScript object
void	setMember(String name, Object value)	Set a named member in this JavaScript object
void	setSlot(int index, Object value)	Set an indexed member in this JavaScript object
double	toNumber()	Deprecated. use JSObject.getDefaultValue(Class) with Number hint instead.
Collection<Object>	values()	Returns the set of all property values of this object.

Methods inherited from interface jdk.nashorn.api.scripting.JSObject

getDefaultValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractJSObject

public AbstractJSObject()

The default constructor.

Method Detail

call

public Object call(Object thiz,
                   Object... args)

Description copied from interface: JSObject

Call this object as a JavaScript function. This is equivalent to 'func.apply(thiz, args)' in JavaScript.

Specified by:

call in interface JSObject

Implementation Requirements:

This implementation always throws UnsupportedOperationException

Parameters:

thiz - 'this' object to be passed to the function. This may be null.

args - arguments to method

Returns:

result of call

newObject

public Object newObject(Object... args)

Description copied from interface: JSObject

Call this 'constructor' JavaScript function to create a new object. This is equivalent to 'new func(arg1, arg2...)' in JavaScript.

Specified by:

newObject in interface JSObject

Implementation Requirements:

This implementation always throws UnsupportedOperationException

Parameters:

args - arguments to method

Returns:

result of constructor call

eval

public Object eval(String s)

Description copied from interface: JSObject

Evaluate a JavaScript expression.

Specified by:

eval in interface JSObject

Implementation Requirements:

This imlementation always throws UnsupportedOperationException

Parameters:

s - JavaScript expression to evaluate

Returns:

evaluation result

getMember

public Object getMember(String name)

Description copied from interface: JSObject

Retrieves a named member of this JavaScript object.

Specified by:

getMember in interface JSObject

Implementation Requirements:

This implementation always returns null

Parameters:

name - of member

Returns:

member

getSlot

public Object getSlot(int index)

Description copied from interface: JSObject

Retrieves an indexed member of this JavaScript object.

Specified by:

getSlot in interface JSObject

Implementation Requirements:

This implementation always returns null

Parameters:

index - index slot to retrieve

Returns:

member

hasMember

public boolean hasMember(String name)

Description copied from interface: JSObject

Does this object have a named member?

Specified by:

hasMember in interface JSObject

Implementation Requirements:

This implementation always returns false

Parameters:

name - name of member

Returns:

true if this object has a member of the given name

hasSlot

public boolean hasSlot(int slot)

Description copied from interface: JSObject

Does this object have a indexed property?

Specified by:

hasSlot in interface JSObject

Implementation Requirements:

This implementation always returns false

Parameters:

slot - index to check

Returns:

true if this object has a slot

removeMember

public void removeMember(String name)

Description copied from interface: JSObject

Remove a named member from this JavaScript object

Specified by:

removeMember in interface JSObject

Implementation Requirements:

This implementation is a no-op

Parameters:

name - name of the member

setMember

public void setMember(String name,
                      Object value)

Description copied from interface: JSObject

Set a named member in this JavaScript object

Specified by:

setMember in interface JSObject

Implementation Requirements:

This implementation is a no-op

Parameters:

name - name of the member

value - value of the member

setSlot

public void setSlot(int index,
                    Object value)

Description copied from interface: JSObject

Set an indexed member in this JavaScript object

Specified by:

setSlot in interface JSObject

Implementation Requirements:

This implementation is a no-op

Parameters:

index - index of the member slot

value - value of the member

keySet

public Set<String> keySet()

Description copied from interface: JSObject

Returns the set of all property names of this object.

Specified by:

keySet in interface JSObject

Implementation Requirements:

This implementation returns empty set

Returns:

set of property names

values

public Collection<Object> values()

Description copied from interface: JSObject

Returns the set of all property values of this object.

Specified by:

values in interface JSObject

Implementation Requirements:

This implementation returns empty set

Returns:

set of property values.

isInstance

public boolean isInstance(Object instance)

Description copied from interface: JSObject

Checking whether the given object is an instance of 'this' object.

Specified by:

isInstance in interface JSObject

Implementation Requirements:

This implementation always returns false

Parameters:

instance - instance to check

Returns:

true if the given 'instance' is an instance of this 'function' object

isInstanceOf

public boolean isInstanceOf(Object clazz)

Description copied from interface: JSObject

Checking whether this object is an instance of the given 'clazz' object.

Specified by:

isInstanceOf in interface JSObject

Parameters:

clazz - clazz to check

Returns:

true if this object is an instance of the given 'clazz'

getClassName

public String getClassName()

Description copied from interface: JSObject

ECMA [[Class]] property

Specified by:

getClassName in interface JSObject

Returns:

ECMA [[Class]] property value of this object

isFunction

public boolean isFunction()

Description copied from interface: JSObject

Is this a function object?

Specified by:

isFunction in interface JSObject

Implementation Requirements:

This implementation always returns false

Returns:

if this mirror wraps a ECMAScript function instance

isStrictFunction

public boolean isStrictFunction()

Description copied from interface: JSObject

Is this a 'use strict' function object?

Specified by:

isStrictFunction in interface JSObject

Implementation Requirements:

This implementation always returns false

Returns:

true if this mirror represents a ECMAScript 'use strict' function

isArray

public boolean isArray()

Description copied from interface: JSObject

Is this an array object?

Specified by:

isArray in interface JSObject

Implementation Requirements:

This implementation always returns false

Returns:

if this mirror wraps a ECMAScript array object

toNumber

@Deprecated
public double toNumber()

Deprecated. use JSObject.getDefaultValue(Class) with Number hint instead.

Returns this object's numeric value.

Specified by:

toNumber in interface JSObject

Returns:

this object's numeric value.

getDefaultValue

@Deprecated
public static Object getDefaultValue(JSObject jsobj,
                                     Class<?> hint)

Deprecated. use JSObject.getDefaultValue(Class) instead.

When passed an AbstractJSObject, invokes its JSObject.getDefaultValue(Class) method. When passed any other JSObject, it will obtain its [[DefaultValue]] method as per ECMAScript 5.1 section 8.6.2.

Parameters:

jsobj - the JSObject whose [[DefaultValue]] is obtained.

hint - the type hint. Should be either null, Number.class or String.class.

Returns:

this object's default value.

Throws:

UnsupportedOperationException - if the conversion can't be performed. The engine will convert this exception into a JavaScript TypeError.