org.mozilla.javascript

Class VMBridge

java.lang.Object

org.mozilla.javascript.VMBridge

Direct Known Subclasses:

VMBridge_jdk13

public abstract class VMBridge
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
VMBridge()

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract Context	getContext(java.lang.Object contextHelper) Get Context instance associated with the current thread or null if none.
protected abstract java.lang.ClassLoader	getCurrentThreadClassLoader() Return the ClassLoader instance associated with the current thread.
protected java.lang.Object	getInterfaceProxyHelper(ContextFactory cf, java.lang.Class<?>[] interfaces) Create helper object to create later proxies implementing the specified interfaces later.
java.util.Iterator<?>	getJavaIterator(Context cx, Scriptable scope, java.lang.Object obj) If "obj" is a java.util.Iterator or a java.lang.Iterable, return a wrapping as a JavaScript Iterator.
protected abstract java.lang.Object	getThreadContextHelper() Return a helper object to optimize Context access.
protected abstract boolean	isVarArgs(java.lang.reflect.Member member) Returns whether or not a given member (method or constructor) has variable arguments.
protected java.lang.Object	newInterfaceProxy(java.lang.Object proxyHelper, ContextFactory cf, InterfaceAdapter adapter, java.lang.Object target, Scriptable topScope) Create proxy object for InterfaceAdapter.
protected abstract void	setContext(java.lang.Object contextHelper, Context cx) Associate Context instance with the current thread or remove the current association if cx is null.
protected abstract boolean	tryToMakeAccessible(java.lang.Object accessibleObject) In many JVMSs, public methods in private classes are not accessible by default (Sun Bug #4071593).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

VMBridge

public VMBridge()

Method Detail

getThreadContextHelper

protected abstract java.lang.Object getThreadContextHelper()

Return a helper object to optimize Context access.

The runtime will pass the resulting helper object to the subsequent calls to getContext(Object contextHelper) and setContext(Object contextHelper, Context cx) methods. In this way the implementation can use the helper to cache information about current thread to make Context access faster.

getContext

protected abstract Context getContext(java.lang.Object contextHelper)

Get Context instance associated with the current thread or null if none.

Parameters:

contextHelper - The result of getThreadContextHelper() called from the current thread.

setContext

protected abstract void setContext(java.lang.Object contextHelper,
              Context cx)

Associate Context instance with the current thread or remove the current association if cx is null.

Parameters:

contextHelper - The result of getThreadContextHelper() called from the current thread.

getCurrentThreadClassLoader

protected abstract java.lang.ClassLoader getCurrentThreadClassLoader()

Return the ClassLoader instance associated with the current thread.

tryToMakeAccessible

protected abstract boolean tryToMakeAccessible(java.lang.Object accessibleObject)

In many JVMSs, public methods in private classes are not accessible by default (Sun Bug #4071593). VMBridge instance should try to workaround that via, for example, calling method.setAccessible(true) when it is available. The implementation is responsible to catch all possible exceptions like SecurityException if the workaround is not available.

Returns:

true if it was possible to make method accessible or false otherwise.

getInterfaceProxyHelper

protected java.lang.Object getInterfaceProxyHelper(ContextFactory cf,
                                       java.lang.Class<?>[] interfaces)

Create helper object to create later proxies implementing the specified interfaces later. Under JDK 1.3 the implementation can look like:

 return java.lang.reflect.Proxy.getProxyClass(..., interfaces).
     getConstructor(new Class[] {
         java.lang.reflect.InvocationHandler.class });
 

Parameters:

interfaces - Array with one or more interface class objects.

newInterfaceProxy

protected java.lang.Object newInterfaceProxy(java.lang.Object proxyHelper,
                                 ContextFactory cf,
                                 InterfaceAdapter adapter,
                                 java.lang.Object target,
                                 Scriptable topScope)

Create proxy object for InterfaceAdapter. The proxy should call InterfaceAdapter#invoke(ContextFactory cf, Object target, Scriptable topScope, Method method, Object[] args) as implementation of interface methods associated with proxyHelper.

Parameters:

proxyHelper - The result of the previous call to getInterfaceProxyHelper(ContextFactory, Class[]).

isVarArgs

protected abstract boolean isVarArgs(java.lang.reflect.Member member)

Returns whether or not a given member (method or constructor) has variable arguments. Variable argument methods have only been supported in Java since JDK 1.5.

getJavaIterator

public java.util.Iterator<?> getJavaIterator(Context cx,
                                    Scriptable scope,
                                    java.lang.Object obj)

If "obj" is a java.util.Iterator or a java.lang.Iterable, return a wrapping as a JavaScript Iterator. Otherwise, return null. This method is in VMBridge since Iterable is a JDK 1.5 addition.