org.mozilla.javascript
Interface Function

All Known Implementing Classes:

org.mozilla.javascript.NativeFunction

public abstract interface Function

extends Scriptable

This is interface that all functions in JavaScript must implement. The interface provides for calling functions and constructors.

Author:

Norris Boyd

See Also:

Scriptable

Fields inherited from class org.mozilla.javascript.Scriptable

NOT_FOUND

Method Summary

java.lang.Object	call(Context cx, Scriptable scope, Scriptable thisObj, java.lang.Object[] args) Call the function.
Scriptable	construct(Context cx, Scriptable scope, java.lang.Object[] args) Call the function as a constructor.

Methods inherited from interface org.mozilla.javascript.Scriptable

delete, delete, get, get, getClassName, getDefaultValue, getIds, getParentScope, getPrototype, has, has, hasInstance, put, put, setParentScope, setPrototype

Method Detail

call

public java.lang.Object call(Context cx,
                             Scriptable scope,
                             Scriptable thisObj,
                             java.lang.Object[] args)
                      throws JavaScriptException

Call the function. Note that the array of arguments is not guaranteed to have length greater than 0.

Parameters:

cx - the current Context for this thread

scope - the scope to execute the function relative to. This set to the value returned by getParentScope() except when the function is called from a closure.

thisObj - the JavaScript this object

args - the array of arguments

Returns:

the result of the call

Throws:

JavaScriptException - if an uncaught exception occurred while executing the function

construct

public Scriptable construct(Context cx,
                            Scriptable scope,
                            java.lang.Object[] args)
                     throws JavaScriptException

Call the function as a constructor. This method is invoked by the runtime in order to satisfy a use of the JavaScript new operator. This method is expected to create a new object and return it.

Parameters:

cx - the current Context for this thread

scope - an enclosing scope of the caller except when the function is called from a closure.

args - the array of arguments

Returns:

the allocated object

Throws:

JavaScriptException - if an uncaught exception occurred while executing the constructor