org.mozilla.javascript
Class VMBridge

java.lang.Object
  extended by org.mozilla.javascript.VMBridge
Direct Known Subclasses:
VMBridge_jdk13

public abstract class VMBridge
extends java.lang.Object


Constructor Summary
VMBridge()
           
 
Method Summary
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.