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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically
embedded into Java applications to provide scripting to end users.
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// API class
package org.mozilla.javascript;
/**
* Class ImporterTopLevel
*
* This class defines a ScriptableObject that can be instantiated
* as a top-level ("global") object to provide functionality similar
* to Java's "import" statement.
*
* This class can be used to create a top-level scope using the following code:
*
* Scriptable scope = new ImporterTopLevel(cx);
*
* Then JavaScript code will have access to the following methods:
*
* - importClass - will "import" a class by making its unqualified name
* available as a property of the top-level scope
*
- importPackage - will "import" all the classes of the package by
* searching for unqualified names as classes qualified
* by the given package.
*
* The following code from the shell illustrates this use:
*
* js> importClass(java.io.File)
* js> f = new File('help.txt')
* help.txt
* js> importPackage(java.util)
* js> v = new Vector()
* []
*
*
* @author Norris Boyd
*/
public class ImporterTopLevel extends TopLevel {
private static final long serialVersionUID = -9095380847465315412L;
private static final Object IMPORTER_TAG = "Importer";
public ImporterTopLevel() { }
public ImporterTopLevel(Context cx) {
this(cx, false);
}
public ImporterTopLevel(Context cx, boolean sealed)
{
initStandardObjects(cx, sealed);
}
@Override
public String getClassName()
{
return (topScopeFlag) ? "global" : "JavaImporter";
}
public static void init(Context cx, Scriptable scope, boolean sealed)
{
ImporterTopLevel obj = new ImporterTopLevel();
obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
}
public void initStandardObjects(Context cx, boolean sealed)
{
// Assume that Context.initStandardObjects initialize JavaImporter
// property lazily so the above init call is not yet called
cx.initStandardObjects(this, sealed);
topScopeFlag = true;
// If seal is true then exportAsJSClass(cx, seal) would seal
// this obj. Since this is scope as well, it would not allow
// to add variables.
IdFunctionObject ctor = exportAsJSClass(MAX_PROTOTYPE_ID, this, false);
if (sealed) {
ctor.sealObject();
}
// delete "constructor" defined by exportAsJSClass so "constructor"
// name would refer to Object.constructor
// and not to JavaImporter.prototype.constructor.
delete("constructor");
}
@Override
public boolean has(String name, Scriptable start) {
return super.has(name, start)
|| getPackageProperty(name, start) != NOT_FOUND;
}
@Override
public Object get(String name, Scriptable start) {
Object result = super.get(name, start);
if (result != NOT_FOUND)
return result;
result = getPackageProperty(name, start);
return result;
}
private Object getPackageProperty(String name, Scriptable start) {
Object result = NOT_FOUND;
Object[] elements;
synchronized (importedPackages) {
elements = importedPackages.toArray();
}
for (int i=0; i < elements.length; i++) {
NativeJavaPackage p = (NativeJavaPackage) elements[i];
Object v = p.getPkgProperty(name, start, false);
if (v != null && !(v instanceof NativeJavaPackage)) {
if (result == NOT_FOUND) {
result = v;
} else {
throw Context.reportRuntimeError2(
"msg.ambig.import", result.toString(), v.toString());
}
}
}
return result;
}
/**
* @deprecated Kept only for compatibility.
*/
@Deprecated
public void importPackage(Context cx, Scriptable thisObj, Object[] args,
Function funObj)
{
js_importPackage(args);
}
private Object js_construct(Scriptable scope, Object[] args)
{
ImporterTopLevel result = new ImporterTopLevel();
for (int i = 0; i != args.length; ++i) {
Object arg = args[i];
if (arg instanceof NativeJavaClass) {
result.importClass((NativeJavaClass)arg);
} else if (arg instanceof NativeJavaPackage) {
result.importPackage((NativeJavaPackage)arg);
} else {
throw Context.reportRuntimeError1(
"msg.not.class.not.pkg", Context.toString(arg));
}
}
// set explicitly prototype and scope
// as otherwise in top scope mode BaseFunction.construct
// would keep them set to null. It also allow to use
// JavaImporter without new and still get properly
// initialized object.
result.setParentScope(scope);
result.setPrototype(this);
return result;
}
private Object js_importClass(Object[] args)
{
for (int i = 0; i != args.length; i++) {
Object arg = args[i];
if (!(arg instanceof NativeJavaClass)) {
throw Context.reportRuntimeError1(
"msg.not.class", Context.toString(arg));
}
importClass((NativeJavaClass)arg);
}
return Undefined.instance;
}
private Object js_importPackage(Object[] args)
{
for (int i = 0; i != args.length; i++) {
Object arg = args[i];
if (!(arg instanceof NativeJavaPackage)) {
throw Context.reportRuntimeError1(
"msg.not.pkg", Context.toString(arg));
}
importPackage((NativeJavaPackage)arg);
}
return Undefined.instance;
}
private void importPackage(NativeJavaPackage pkg)
{
if(pkg == null) {
return;
}
synchronized (importedPackages) {
for (int j = 0; j != importedPackages.size(); j++) {
if (pkg.equals(importedPackages.get(j))) {
return;
}
}
importedPackages.add(pkg);
}
}
private void importClass(NativeJavaClass cl)
{
String s = cl.getClassObject().getName();
String n = s.substring(s.lastIndexOf('.')+1);
Object val = get(n, this);
if (val != NOT_FOUND && val != cl) {
throw Context.reportRuntimeError1("msg.prop.defined", n);
}
//defineProperty(n, cl, DONTENUM);
put(n, this, cl);
}
@Override
protected void initPrototypeId(int id)
{
String s;
int arity;
switch (id) {
case Id_constructor: arity=0; s="constructor"; break;
case Id_importClass: arity=1; s="importClass"; break;
case Id_importPackage: arity=1; s="importPackage"; break;
default: throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(IMPORTER_TAG, id, s, arity);
}
@Override
public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
if (!f.hasTag(IMPORTER_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
switch (id) {
case Id_constructor:
return js_construct(scope, args);
case Id_importClass:
return realThis(thisObj, f).js_importClass(args);
case Id_importPackage:
return realThis(thisObj, f).js_importPackage(args);
}
throw new IllegalArgumentException(String.valueOf(id));
}
private ImporterTopLevel realThis(Scriptable thisObj, IdFunctionObject f)
{
if (topScopeFlag) {
// when used as top scope importPackage and importClass are global
// function that ignore thisObj
return this;
}
if (!(thisObj instanceof ImporterTopLevel))
throw incompatibleCallError(f);
return (ImporterTopLevel)thisObj;
}
// #string_id_map#
@Override
protected int findPrototypeId(String s)
{
int id;
// #generated# Last update: 2007-05-09 08:15:24 EDT
L0: { id = 0; String X = null; int c;
int s_length = s.length();
if (s_length==11) {
c=s.charAt(0);
if (c=='c') { X="constructor";id=Id_constructor; }
else if (c=='i') { X="importClass";id=Id_importClass; }
}
else if (s_length==13) { X="importPackage";id=Id_importPackage; }
if (X!=null && X!=s && !X.equals(s)) id = 0;
break L0;
}
// #/generated#
return id;
}
private static final int
Id_constructor = 1,
Id_importClass = 2,
Id_importPackage = 3,
MAX_PROTOTYPE_ID = 3;
// #/string_id_map#
private ObjArray importedPackages = new ObjArray();
private boolean topScopeFlag;
}
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