public class FunctionObject
extends org.mozilla.javascript.BaseFunction
| 限定符和类型 | 字段和说明 |
|---|---|
static int |
JAVA_BOOLEAN_TYPE |
static int |
JAVA_DOUBLE_TYPE |
static int |
JAVA_INT_TYPE |
static int |
JAVA_OBJECT_TYPE |
static int |
JAVA_SCRIPTABLE_TYPE |
static int |
JAVA_STRING_TYPE |
static int |
JAVA_UNSUPPORTED_TYPE |
CONST, DONTENUM, EMPTY, PERMANENT, READONLY, UNINITIALIZED_CONST| 构造器和说明 |
|---|
FunctionObject(java.lang.String name,
java.lang.reflect.Member methodOrConstructor,
org.mozilla.javascript.Scriptable scope)
Create a JavaScript function object from a Java method.
|
| 限定符和类型 | 方法和说明 |
|---|---|
void |
addAsConstructor(org.mozilla.javascript.Scriptable scope,
org.mozilla.javascript.Scriptable prototype)
Define this function as a JavaScript constructor.
|
java.lang.Object |
call(Context cx,
org.mozilla.javascript.Scriptable scope,
org.mozilla.javascript.Scriptable thisObj,
java.lang.Object[] args)
Performs conversions on argument types if needed and
invokes the underlying Java method or constructor.
|
static java.lang.Object |
convertArg(Context cx,
org.mozilla.javascript.Scriptable scope,
java.lang.Object arg,
java.lang.Class<?> desired)
已过时。
Use
getTypeTag(Class)
and convertArg(Context, Scriptable, Object, int)
for type conversion. |
static java.lang.Object |
convertArg(Context cx,
org.mozilla.javascript.Scriptable scope,
java.lang.Object arg,
int typeTag) |
org.mozilla.javascript.Scriptable |
createObject(Context cx,
org.mozilla.javascript.Scriptable scope)
Return new
Scriptable instance using the default
constructor for the class of the underlying Java method. |
int |
getArity()
Return the value defined by the method used to construct the object
(number of parameters of the method, or 1 if the method is a "varargs"
form).
|
java.lang.String |
getFunctionName() |
int |
getLength()
Return the same value as
getArity(). |
java.lang.reflect.Member |
getMethodOrConstructor()
Get Java method or constructor this function represent.
|
static int |
getTypeTag(java.lang.Class<?> type) |
construct, execIdCall, getClassName, getTypeOf, hasInstance, setImmunePrototypePropertyactivatePrototypeMap, defineOwnProperty, delete, exportAsJSClass, get, getAttributes, has, hasPrototypeMap, initPrototypeConstructor, initPrototypeMethod, initPrototypeValue, put, setAttributesassociateValue, avoidObjectDetection, callMethod, callMethod, defineClass, defineClass, defineClass, defineConst, defineConstProperty, defineFunctionProperties, defineOwnProperties, defineProperty, defineProperty, defineProperty, defineProperty, delete, deleteProperty, deleteProperty, get, get, getAllIds, getArrayPrototype, getAssociatedValue, getAttributes, getAttributes, getAttributes, getClassPrototype, getDefaultValue, getDefaultValue, getExternalArrayData, getExternalArrayLength, getFunctionPrototype, getGetterOrSetter, getIds, getObjectPrototype, getParentScope, getProperty, getProperty, getPropertyIds, getPrototype, getTopLevelScope, getTopScopeValue, getTypedProperty, getTypedProperty, has, hasProperty, hasProperty, isConst, isEmpty, isExtensible, isSealed, preventExtensions, put, putConst, putConstProperty, putProperty, putProperty, redefineProperty, sealObject, setAttributes, setAttributes, setAttributes, setExternalArrayData, setGetterOrSetter, setParentScope, setPrototype, sizepublic static final int JAVA_UNSUPPORTED_TYPE
public static final int JAVA_STRING_TYPE
public static final int JAVA_INT_TYPE
public static final int JAVA_BOOLEAN_TYPE
public static final int JAVA_DOUBLE_TYPE
public static final int JAVA_SCRIPTABLE_TYPE
public static final int JAVA_OBJECT_TYPE
public FunctionObject(java.lang.String name,
java.lang.reflect.Member methodOrConstructor,
org.mozilla.javascript.Scriptable scope)
The member argument must be either a java.lang.reflect.Method
or a java.lang.reflect.Constructor and must match one of two forms.
The first form is a member with zero or more parameters of the following types: Object, String, boolean, Scriptable, int, or double. The Long type is not supported because the double representation of a long (which is the EMCA-mandated storage type for Numbers) may lose precision. If the member is a Method, the return value must be void or one of the types allowed for parameters.
The runtime will perform appropriate conversions based upon the type of the parameter. A parameter type of Object specifies that no conversions are to be done. A parameter of type String will use Context.toString to convert arguments. Similarly, parameters of type double, boolean, and Scriptable will cause Context.toNumber, Context.toBoolean, and Context.toObject, respectively, to be called.
If the method is not static, the Java 'this' value will correspond to the JavaScript 'this' value. Any attempt to call the function with a 'this' value that is not of the right Java type will result in an error.
The second form is the variable arguments (or "varargs") form. If the FunctionObject will be used as a constructor, the member must have the following parameters
(Context cx, Object[] args, Function ctorObj,
boolean inNewExpr)
and if it is a Method, be static and return an Object result.Otherwise, if the FunctionObject will not be used to define a constructor, the member must be a static Method with parameters
(Context cx, Scriptable thisObj, Object[] args,
Function funObj)
and an Object result.
When the function varargs form is called as part of a function call,
the args parameter contains the
arguments, with thisObj
set to the JavaScript 'this' value. funObj
is the function object for the invoked function.
When the constructor varargs form is called or invoked while evaluating
a new expression, args contains the
arguments, ctorObj refers to this FunctionObject, and
inNewExpr is true if and only if a new
expression caused the call. This supports defining a function that
has different behavior when called as a constructor than when
invoked as a normal function call. (For example, the Boolean
constructor, when called as a function,
will convert to boolean rather than creating a new object.)
name - the name of the functionmethodOrConstructor - a java.lang.reflect.Method or a java.lang.reflect.Constructor
that defines the objectscope - enclosing scope of functionScriptablepublic static int getTypeTag(java.lang.Class<?> type)
JAVA_UNSUPPORTED_TYPE if the convertion is not
possiblepublic static java.lang.Object convertArg(Context cx, org.mozilla.javascript.Scriptable scope, java.lang.Object arg, int typeTag)
public int getArity()
getArity 在类中 org.mozilla.javascript.BaseFunctionpublic int getLength()
getArity().getLength 在类中 org.mozilla.javascript.BaseFunctionpublic java.lang.String getFunctionName()
getFunctionName 在类中 org.mozilla.javascript.BaseFunctionpublic java.lang.reflect.Member getMethodOrConstructor()
public void addAsConstructor(org.mozilla.javascript.Scriptable scope,
org.mozilla.javascript.Scriptable prototype)
Sets up the "prototype" and "constructor" properties. Also
calls setParent and setPrototype with appropriate values.
Then adds the function object as a property of the given scope, using
prototype.getClassName()
as the name of the property.
scope - the scope in which to define the constructor (typically
the global object)prototype - the prototype objectScriptable.setParentScope(org.mozilla.javascript.Scriptable),
Scriptable.setPrototype(org.mozilla.javascript.Scriptable),
Scriptable.getClassName()@Deprecated public static java.lang.Object convertArg(Context cx, org.mozilla.javascript.Scriptable scope, java.lang.Object arg, java.lang.Class<?> desired)
getTypeTag(Class)
and convertArg(Context, Scriptable, Object, int)
for type conversion.public java.lang.Object call(Context cx, org.mozilla.javascript.Scriptable scope, org.mozilla.javascript.Scriptable thisObj, java.lang.Object[] args)
Implements Function.call.
call 在接口中 org.mozilla.javascript.Callablecall 在接口中 org.mozilla.javascript.Functioncall 在类中 org.mozilla.javascript.BaseFunctionFunction.call(
Context, Scriptable, Scriptable, Object[])public org.mozilla.javascript.Scriptable createObject(Context cx, org.mozilla.javascript.Scriptable scope)
Scriptable instance using the default
constructor for the class of the underlying Java method.
Return null to indicate that the call method should be used to create
new objects.createObject 在类中 org.mozilla.javascript.BaseFunction