Class NativeJavaClass
- java.lang.Object
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- org.mozilla.javascript.NativeJavaObject
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- org.mozilla.javascript.NativeJavaClass
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- All Implemented Interfaces:
java.io.Serializable,Callable,Constructable,Function,Scriptable,SymbolScriptable,Wrapper
public class NativeJavaClass extends NativeJavaObject implements Function
This class reflects Java classes into the JavaScript environment, mainly for constructors and static members. We lazily reflect properties, and currently do not guarantee that a single j.l.Class is only reflected once into the JS environment, although we should. The only known case where multiple reflections are possible occurs when a j.l.Class is wrapped as part of a method return or property access, rather than by walking the Packages/java tree.- See Also:
NativeJavaArray,NativeJavaObject,NativeJavaPackage, Serialized Form
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Field Summary
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Fields inherited from class org.mozilla.javascript.NativeJavaObject
isAdapter, javaObject, members, parent, prototype, staticType
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Fields inherited from interface org.mozilla.javascript.Scriptable
NOT_FOUND
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Constructor Summary
Constructors Constructor Description NativeJavaClass()NativeJavaClass(Scriptable scope, java.lang.Class<?> cl)NativeJavaClass(Scriptable scope, java.lang.Class<?> cl, boolean isAdapter)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Objectcall(Context cx, Scriptable scope, Scriptable thisObj, java.lang.Object[] args)Call the function.Scriptableconstruct(Context cx, Scriptable scope, java.lang.Object[] args)Call the function as a constructor.booleanequals(java.lang.Object obj)java.lang.Objectget(java.lang.String name, Scriptable start)Get a named property from the object.java.lang.StringgetClassName()Get the name of the set of objects implemented by this Java class.java.lang.Class<?>getClassObject()java.lang.ObjectgetDefaultValue(java.lang.Class<?> hint)Get the default value of the object with a given hint.java.lang.Object[]getIds()Get an array of property ids.booleanhas(java.lang.String name, Scriptable start)Indicates whether or not a named property is defined in an object.inthashCode()booleanhasInstance(Scriptable value)Determines if prototype is a wrapped Java object and performs a Java "instanceof".protected voidinitMembers()voidput(java.lang.String name, Scriptable start, java.lang.Object value)Sets a named property in this object.java.lang.StringtoString()-
Methods inherited from class org.mozilla.javascript.NativeJavaObject
canConvert, coerceType, createInterfaceAdapter, delete, delete, delete, get, get, getParentScope, getPrototype, has, has, put, put, setParentScope, setPrototype, unwrap, wrap
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Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.mozilla.javascript.Scriptable
delete, delete, get, getParentScope, getPrototype, has, put, setParentScope, setPrototype
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Constructor Detail
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NativeJavaClass
public NativeJavaClass()
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NativeJavaClass
public NativeJavaClass(Scriptable scope, java.lang.Class<?> cl)
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NativeJavaClass
public NativeJavaClass(Scriptable scope, java.lang.Class<?> cl, boolean isAdapter)
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Method Detail
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initMembers
protected void initMembers()
- Overrides:
initMembersin classNativeJavaObject
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getClassName
public java.lang.String getClassName()
Description copied from interface:ScriptableGet the name of the set of objects implemented by this Java class. This corresponds to the [[Class]] operation in ECMA and is used by Object.prototype.toString() in ECMA.See ECMA 8.6.2 and 15.2.4.2.
- Specified by:
getClassNamein interfaceScriptable- Overrides:
getClassNamein classNativeJavaObject
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has
public boolean has(java.lang.String name, Scriptable start)Description copied from interface:ScriptableIndicates whether or not a named property is defined in an object.Does not traverse the prototype chain.
The property is specified by a String name as defined for the
getmethod.- Specified by:
hasin interfaceScriptable- Overrides:
hasin classNativeJavaObject- Parameters:
name- the name of the propertystart- the object in which the lookup began- Returns:
- true if and only if the named property is found in the object
- See Also:
Scriptable.get(String, Scriptable),ScriptableObject.getProperty(Scriptable, String)
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get
public java.lang.Object get(java.lang.String name, Scriptable start)Description copied from interface:ScriptableGet a named property from the object.Looks property up in this object and returns the associated value if found. Returns NOT_FOUND if not found. Note that this method is not expected to traverse the prototype chain. This is different from the ECMA [[Get]] operation.
Depending on the property selector, the runtime will call this method or the form of
getthat takes an integer:JavaScript code Java code a.b a.get("b", a) a["foo"] a.get("foo", a) a[3] a.get(3, a) a["3"] a.get(3, a) a[3.0] a.get(3, a) a["3.0"] a.get("3.0", a) a[1.1] a.get("1.1", a) a[-4] a.get(-4, a) The values that may be returned are limited to the following:
- java.lang.Boolean objects
- java.lang.String objects
- java.lang.Number objects
- org.mozilla.javascript.Scriptable objects
- null
- The value returned by Context.getUndefinedValue()
- NOT_FOUND
- Specified by:
getin interfaceScriptable- Overrides:
getin classNativeJavaObject- Parameters:
name- the name of the propertystart- the object in which the lookup began- Returns:
- the value of the property (may be null), or NOT_FOUND
- See Also:
Context.getUndefinedValue()
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put
public void put(java.lang.String name, Scriptable start, java.lang.Object value)Description copied from interface:ScriptableSets a named property in this object.The property is specified by a string name as defined for
get.The possible values that may be passed in are as defined for
get. A class that implements this method may choose to ignore calls to set certain properties, in which case those properties are effectively read-only.For properties defined in a prototype chain, use
putPropertyin ScriptableObject.Note that if a property a is defined in the prototype p of an object o, then evaluating
o.a = 23will causesetto be called on the prototype p with o as the start parameter. To preserve JavaScript semantics, it is the Scriptable object's responsibility to modify o.This design allows properties to be defined in prototypes and implemented in terms of getters and setters of Java values without consuming slots in each instance.
The values that may be set are limited to the following:
- java.lang.Boolean objects
- java.lang.String objects
- java.lang.Number objects
- org.mozilla.javascript.Scriptable objects
- null
- The value returned by Context.getUndefinedValue()
Arbitrary Java objects may be wrapped in a Scriptable by first calling
Context.toObject. This allows the property of a JavaScript object to contain an arbitrary Java object as a value.Note that
haswill be called by the runtime first beforesetis called to determine in which object the property is defined. Note that this method is not expected to traverse the prototype chain, which is different from the ECMA [[Put]] operation.- Specified by:
putin interfaceScriptable- Overrides:
putin classNativeJavaObject- Parameters:
name- the name of the propertystart- the object whose property is being setvalue- value to set the property to- See Also:
Scriptable.has(String, Scriptable),Scriptable.get(String, Scriptable),ScriptableObject.putProperty(Scriptable, String, Object),Context.toObject(Object, Scriptable)
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getIds
public java.lang.Object[] getIds()
Description copied from interface:ScriptableGet an array of property ids.Not all property ids need be returned. Those properties whose ids are not returned are considered non-enumerable.
- Specified by:
getIdsin interfaceScriptable- Overrides:
getIdsin classNativeJavaObject- Returns:
- an array of Objects. Each entry in the array is either a java.lang.String or a java.lang.Number
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getClassObject
public java.lang.Class<?> getClassObject()
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getDefaultValue
public java.lang.Object getDefaultValue(java.lang.Class<?> hint)
Description copied from interface:ScriptableGet the default value of the object with a given hint. The hints are String.class for type String, Number.class for type Number, Scriptable.class for type Object, and Boolean.class for type Boolean.A
hintof null means "no hint".See ECMA 8.6.2.6.
- Specified by:
getDefaultValuein interfaceScriptable- Overrides:
getDefaultValuein classNativeJavaObject- Parameters:
hint- the type hint- Returns:
- the default value
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call
public java.lang.Object call(Context cx, Scriptable scope, Scriptable thisObj, java.lang.Object[] args)
Description copied from interface:FunctionCall the function.Note that the array of arguments is not guaranteed to have length greater than 0.
- Specified by:
callin interfaceCallable- Specified by:
callin interfaceFunction- Parameters:
cx- the current Context for this threadscope- the scope to execute the function relative to. This is set to the value returned by getParentScope() except when the function is called from a closure.thisObj- the JavaScriptthisobjectargs- the array of arguments- Returns:
- the result of the call
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construct
public Scriptable construct(Context cx, Scriptable scope, java.lang.Object[] args)
Description copied from interface:FunctionCall the function as a constructor.This method is invoked by the runtime in order to satisfy a use of the JavaScript
newoperator. This method is expected to create a new object and return it.- Specified by:
constructin interfaceConstructable- Specified by:
constructin interfaceFunction- Parameters:
cx- the current Context for this threadscope- an enclosing scope of the caller except when the function is called from a closure.args- the array of arguments- Returns:
- the allocated object
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toString
public java.lang.String toString()
- Overrides:
toStringin classjava.lang.Object
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hasInstance
public boolean hasInstance(Scriptable value)
Determines if prototype is a wrapped Java object and performs a Java "instanceof". Exception: if value is an instance of NativeJavaClass, it isn't considered an instance of the Java class; this forestalls any name conflicts between java.lang.Class's methods and the static methods exposed by a JavaNativeClass.- Specified by:
hasInstancein interfaceScriptable- Overrides:
hasInstancein classNativeJavaObject- Parameters:
value- The value that appeared on the LHS of the instanceof operator- Returns:
- an implementation dependent value
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equals
public boolean equals(java.lang.Object obj)
- Overrides:
equalsin classNativeJavaObject
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hashCode
public int hashCode()
- Overrides:
hashCodein classNativeJavaObject
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