org.mozilla.javascript.MemberBox Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of js Show documentation
Show all versions of js Show documentation
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.
The newest version!
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Igor Bukanov
* Felix Meschberger
* Norris Boyd
* Ulrike Mueller
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript;
import java.lang.reflect.*;
import java.io.*;
/**
* Wrappper class for Method and Constructor instances to cache
* getParameterTypes() results, recover from IllegalAccessException
* in some cases and provide serialization support.
*
* @author Igor Bukanov
*/
final class MemberBox implements Serializable
{
static final long serialVersionUID = 6358550398665688245L;
private transient Member memberObject;
transient Class[] argTypes;
transient Object delegateTo;
transient boolean vararg;
MemberBox(Method method)
{
init(method);
}
MemberBox(Constructor constructor)
{
init(constructor);
}
private void init(Method method)
{
this.memberObject = method;
this.argTypes = method.getParameterTypes();
this.vararg = VMBridge.instance.isVarArgs(method);
}
private void init(Constructor constructor)
{
this.memberObject = constructor;
this.argTypes = constructor.getParameterTypes();
this.vararg = VMBridge.instance.isVarArgs(constructor);
}
Method method()
{
return (Method)memberObject;
}
Constructor ctor()
{
return (Constructor)memberObject;
}
Member member()
{
return memberObject;
}
boolean isMethod()
{
return memberObject instanceof Method;
}
boolean isCtor()
{
return memberObject instanceof Constructor;
}
boolean isStatic()
{
return Modifier.isStatic(memberObject.getModifiers());
}
String getName()
{
return memberObject.getName();
}
Class getDeclaringClass()
{
return memberObject.getDeclaringClass();
}
String toJavaDeclaration()
{
StringBuffer sb = new StringBuffer();
if (isMethod()) {
Method method = method();
sb.append(method.getReturnType());
sb.append(' ');
sb.append(method.getName());
} else {
Constructor ctor = ctor();
String name = ctor.getDeclaringClass().getName();
int lastDot = name.lastIndexOf('.');
if (lastDot >= 0) {
name = name.substring(lastDot + 1);
}
sb.append(name);
}
sb.append(JavaMembers.liveConnectSignature(argTypes));
return sb.toString();
}
@Override
public String toString()
{
return memberObject.toString();
}
Object invoke(Object target, Object[] args)
{
Method method = method();
try {
try {
return method.invoke(target, args);
} catch (IllegalAccessException ex) {
Method accessible = searchAccessibleMethod(method, argTypes);
if (accessible != null) {
memberObject = accessible;
method = accessible;
} else {
if (!VMBridge.instance.tryToMakeAccessible(method)) {
throw Context.throwAsScriptRuntimeEx(ex);
}
}
// Retry after recovery
return method.invoke(target, args);
}
} catch (InvocationTargetException ite) {
// Must allow ContinuationPending exceptions to propagate unhindered
Throwable e = ite;
do {
e = ((InvocationTargetException) e).getTargetException();
} while ((e instanceof InvocationTargetException));
if (e instanceof ContinuationPending)
throw (ContinuationPending) e;
throw Context.throwAsScriptRuntimeEx(e);
} catch (Exception ex) {
throw Context.throwAsScriptRuntimeEx(ex);
}
}
Object newInstance(Object[] args)
{
Constructor ctor = ctor();
try {
try {
return ctor.newInstance(args);
} catch (IllegalAccessException ex) {
if (!VMBridge.instance.tryToMakeAccessible(ctor)) {
throw Context.throwAsScriptRuntimeEx(ex);
}
}
return ctor.newInstance(args);
} catch (Exception ex) {
throw Context.throwAsScriptRuntimeEx(ex);
}
}
private static Method searchAccessibleMethod(Method method, Class[] params)
{
int modifiers = method.getModifiers();
if (Modifier.isPublic(modifiers) && !Modifier.isStatic(modifiers)) {
Class c = method.getDeclaringClass();
if (!Modifier.isPublic(c.getModifiers())) {
String name = method.getName();
Class[] intfs = c.getInterfaces();
for (int i = 0, N = intfs.length; i != N; ++i) {
Class intf = intfs[i];
if (Modifier.isPublic(intf.getModifiers())) {
try {
return intf.getMethod(name, params);
} catch (NoSuchMethodException ex) {
} catch (SecurityException ex) { }
}
}
for (;;) {
c = c.getSuperclass();
if (c == null) { break; }
if (Modifier.isPublic(c.getModifiers())) {
try {
Method m = c.getMethod(name, params);
int mModifiers = m.getModifiers();
if (Modifier.isPublic(mModifiers)
&& !Modifier.isStatic(mModifiers))
{
return m;
}
} catch (NoSuchMethodException ex) {
} catch (SecurityException ex) { }
}
}
}
}
return null;
}
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
Member member = readMember(in);
if (member instanceof Method) {
init((Method)member);
} else {
init((Constructor)member);
}
}
private void writeObject(ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
writeMember(out, memberObject);
}
/**
* Writes a Constructor or Method object.
*
* Methods and Constructors are not serializable, so we must serialize
* information about the class, the name, and the parameters and
* recreate upon deserialization.
*/
private static void writeMember(ObjectOutputStream out, Member member)
throws IOException
{
if (member == null) {
out.writeBoolean(false);
return;
}
out.writeBoolean(true);
if (!(member instanceof Method || member instanceof Constructor))
throw new IllegalArgumentException("not Method or Constructor");
out.writeBoolean(member instanceof Method);
out.writeObject(member.getName());
out.writeObject(member.getDeclaringClass());
if (member instanceof Method) {
writeParameters(out, ((Method) member).getParameterTypes());
} else {
writeParameters(out, ((Constructor) member).getParameterTypes());
}
}
/**
* Reads a Method or a Constructor from the stream.
*/
private static Member readMember(ObjectInputStream in)
throws IOException, ClassNotFoundException
{
if (!in.readBoolean())
return null;
boolean isMethod = in.readBoolean();
String name = (String) in.readObject();
Class declaring = (Class) in.readObject();
Class[] parms = readParameters(in);
try {
if (isMethod) {
return declaring.getMethod(name, parms);
} else {
return declaring.getConstructor(parms);
}
} catch (NoSuchMethodException e) {
throw new IOException("Cannot find member: " + e);
}
}
private static final Class[] primitives = {
Boolean.TYPE,
Byte.TYPE,
Character.TYPE,
Double.TYPE,
Float.TYPE,
Integer.TYPE,
Long.TYPE,
Short.TYPE,
Void.TYPE
};
/**
* Writes an array of parameter types to the stream.
*
* Requires special handling because primitive types cannot be
* found upon deserialization by the default Java implementation.
*/
private static void writeParameters(ObjectOutputStream out, Class[] parms)
throws IOException
{
out.writeShort(parms.length);
outer:
for (int i=0; i < parms.length; i++) {
Class parm = parms[i];
boolean primitive = parm.isPrimitive();
out.writeBoolean(primitive);
if (!primitive) {
out.writeObject(parm);
continue;
}
for (int j=0; j < primitives.length; j++) {
if (parm.equals(primitives[j])) {
out.writeByte(j);
continue outer;
}
}
throw new IllegalArgumentException("Primitive " + parm +
" not found");
}
}
/**
* Reads an array of parameter types from the stream.
*/
private static Class[] readParameters(ObjectInputStream in)
throws IOException, ClassNotFoundException
{
Class[] result = new Class[in.readShort()];
for (int i=0; i < result.length; i++) {
if (!in.readBoolean()) {
result[i] = (Class) in.readObject();
continue;
}
result[i] = primitives[in.readByte()];
}
return result;
}
}