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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.script.javascript;
import sun.org.mozilla.javascript.internal.*;
import javax.script.*;
This class serves as top level scope for Rhino. This class adds
3 top level functions (bindings, scope, sync) and two constructors
(JSAdapter, JavaAdapter).
Author: A. Sundararajan Since: 1.6
/**
* This class serves as top level scope for Rhino. This class adds
* 3 top level functions (bindings, scope, sync) and two constructors
* (JSAdapter, JavaAdapter).
*
* @author A. Sundararajan
* @since 1.6
*/
public final class RhinoTopLevel extends ImporterTopLevel {
// variables defined always to help Java access from JavaScript
private static final String builtinVariables =
"var com = Packages.com; \n" +
"var edu = Packages.edu; \n" +
"var javax = Packages.javax; \n" +
"var net = Packages.net; \n" +
"var org = Packages.org; \n";
RhinoTopLevel(Context cx, RhinoScriptEngine engine) {
// second boolean parameter to super constructor tells whether
// to seal standard JavaScript objects or not. If security manager
// is present, we seal the standard objects.
super(cx, System.getSecurityManager() != null);
this.engine = engine;
// initialize JSAdapter lazily. Reduces footprint & startup time.
new LazilyLoadedCtor(this, "JSAdapter",
"com.sun.script.javascript.JSAdapter",
false);
/*
* initialize JavaAdapter. We can't lazy initialize this because
* lazy initializer attempts to define a new property. But, JavaAdapter
* is an exisiting property that we overwrite.
*/
JavaAdapter.init(cx, this, false);
// add top level functions
String names[] = { "bindings", "scope", "sync" };
defineFunctionProperties(names, RhinoTopLevel.class,
ScriptableObject.DONTENUM);
// define built-in variables
cx.evaluateString(this, builtinVariables, "<builtin>", 1, null);
}
The bindings function takes a JavaScript scope object
of type ExternalScriptable and returns the underlying Bindings
instance.
var page = scope(pageBindings);
with (page) {
// code that uses page scope
}
var b = bindings(page);
// operate on bindings here.
/**
* The bindings function takes a JavaScript scope object
* of type ExternalScriptable and returns the underlying Bindings
* instance.
*
* var page = scope(pageBindings);
* with (page) {
* // code that uses page scope
* }
* var b = bindings(page);
* // operate on bindings here.
*/
public static Object bindings(Context cx, Scriptable thisObj, Object[] args,
Function funObj) {
if (args.length == 1) {
Object arg = args[0];
if (arg instanceof Wrapper) {
arg = ((Wrapper)arg).unwrap();
}
if (arg instanceof ExternalScriptable) {
ScriptContext ctx = ((ExternalScriptable)arg).getContext();
Bindings bind = ctx.getBindings(ScriptContext.ENGINE_SCOPE);
return Context.javaToJS(bind,
ScriptableObject.getTopLevelScope(thisObj));
}
}
return cx.getUndefinedValue();
}
The scope function creates a new JavaScript scope object
with given Bindings object as backing store. This can be used
to create a script scope based on arbitrary Bindings instance.
For example, in webapp scenario, a 'page' level Bindings instance
may be wrapped as a scope and code can be run in JavaScripe 'with'
statement:
var page = scope(pageBindings);
with (page) {
// code that uses page scope
}
/**
* The scope function creates a new JavaScript scope object
* with given Bindings object as backing store. This can be used
* to create a script scope based on arbitrary Bindings instance.
* For example, in webapp scenario, a 'page' level Bindings instance
* may be wrapped as a scope and code can be run in JavaScripe 'with'
* statement:
*
* var page = scope(pageBindings);
* with (page) {
* // code that uses page scope
* }
*/
public static Object scope(Context cx, Scriptable thisObj, Object[] args,
Function funObj) {
if (args.length == 1) {
Object arg = args[0];
if (arg instanceof Wrapper) {
arg = ((Wrapper)arg).unwrap();
}
if (arg instanceof Bindings) {
ScriptContext ctx = new SimpleScriptContext();
ctx.setBindings((Bindings)arg, ScriptContext.ENGINE_SCOPE);
Scriptable res = new ExternalScriptable(ctx);
res.setPrototype(ScriptableObject.getObjectPrototype(thisObj));
res.setParentScope(ScriptableObject.getTopLevelScope(thisObj));
return res;
}
}
return cx.getUndefinedValue();
}
The sync function creates a synchronized function (in the sense
of a Java synchronized method) from an existing function. The
new function synchronizes on the this object of
its invocation.
js> var o = { f : sync(function(x) {
print("entry");
Packages.java.lang.Thread.sleep(x*1000);
print("exit");
})};
js> thread(function() {o.f(5);});
entry
js> thread(function() {o.f(5);});
js>
exit
entry
exit
/**
* The sync function creates a synchronized function (in the sense
* of a Java synchronized method) from an existing function. The
* new function synchronizes on the <code>this</code> object of
* its invocation.
* js> var o = { f : sync(function(x) {
* print("entry");
* Packages.java.lang.Thread.sleep(x*1000);
* print("exit");
* })};
* js> thread(function() {o.f(5);});
* entry
* js> thread(function() {o.f(5);});
* js>
* exit
* entry
* exit
*/
public static Object sync(Context cx, Scriptable thisObj, Object[] args,
Function funObj) {
if (args.length == 1 && args[0] instanceof Function) {
return new Synchronizer((Function)args[0]);
} else {
throw Context.reportRuntimeError("wrong argument(s) for sync");
}
}
RhinoScriptEngine getScriptEngine() {
return engine;
}
AccessControlContext getAccessContext() {
return engine.getAccessContext();
}
private RhinoScriptEngine engine;
}