Re: [Php-java-bridge-users] passing objects from PHP to JAVA

[<php...@li...>]

Hi Verena,

> PhpScriptEngine engine = new PhpScriptEngine();
> String s =  "<?php \n";
> s += "java_context()->setAttribute( 'obj', new
> MyClass(), 100 ); \n";
> s += "java_context()->call(java_closure()); \n";
> s +=	"?>";
> engine.eval( new StringReader(s) );

the above code should work, it evaluates the php
script stored in the Java string s.

However, you'll get a warning that the instance of
MyClass is not a Java object. Use 

  java_closure(new MyClass())

instead. 

> Invocable inv = (Invocable) engine;
> inv.invokeMethod( engine.get("obj"), "saySomething",
> new Object() );

You will get a null pointer exception because obj is
bound to null, see the warning above. Furthermore you
have captured the top-level environment, but you
probably want to invoke methods from MyClass().

Frameworks such as Java Server Faces allow you to
define PHP beans and to inject these beans into the
framework:

http://php-java-bridge.cvs.sourceforge.net/php-java-bridge/php-java-bridge/examples/java-server-faces/helloWorld.php?revision=1.6&view=markup

  java_context()->call(java_closure(new helloWorld()))

  ||include("index.php");

The above code creates an instance of the PHP
helloWorld() class, creates a Java proxy for it and
then calls the framework (the java_context()->call
magic does this).

When the call() failed (which means that the first
request came in from the web server, and not from the
framework), we redirect to index.php, which forwards
the browser to the framework, which in turn evaluates
the PHP script. The script creates the PHP bean and
injects it into the framework. After that the
framework holds a reference to the PHP bean and can
call its methods:

http://php-java-bridge.cvs.sourceforge.net/php-java-bridge/php-java-bridge/server/php/java/faces/Script.java?revision=1.6&view=markup

return
((Invocable)((PhpFacesContext)FacesContext.getCurrentInstance()).getScriptEngine(this,
new URL(script))).invoke(name, args);

I think this is exactly what you want. The only
difference is that the above method calls out to a URL
instead of a local script file.
>         String script = "var obj = new Object();
> obj.hello = function(name) 
> { print('Hello, ' + name); }";

> Any chance todo something similar with PHP?

It is certainly possible to automatically call
java_closure(), when a php object is passed to a Java
procedure. But for several reasons we've decided to
require java_closure(php_object). Furthermore, if I
understand the above code correctly, the "new
Object()" above instanciates a Java object, not an
object from the js script interpreter.


Regards,
Jost Boekemeier



		
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