php-java-bridge-users

[Php-java-bridge-users] access elements of java-array

[Peter N. <pn...@kr...>]

Hi,

for a few days I have been testing the php-java-bridge and I must admit 
it seems pretty mature and useful. :->

One slight problem remains though. I do need to call a java-method which 
will return a (dynamic sized)Java-Array of Java-Objects.

signature of the java-method:
public NameValue[] process_context()

usage via php-java-bridge:
$nameValues = $activity->process_context();

So far I couldn't figure out a way how to iterate through all the 
elements of the returned array in PHP. It seems not possible to access 
the java.length property '$nameValues->length' nor will a
'foreach ($nameValues as $value) { echo "soemthing" }' work.

Are there any means available so I can determine how many elements are 
in $nameValues?

I did see the provided examples and manual regarding the use of arrays 
but I am not quite sury about it yet. ;(

Do I need to modify the native Java-Class so it provides another 
java-interface(collection,ArrayList)?

Thx,
Peter

Re: [Php-java-bridge-users] access elements of java-array

[Jost B. <jos...@ya...>]

Hi,

> public NameValue[] process_context
> $nameValues = $activity->process_context();
> So far I couldn't figure out a way how to iterate through all the 
> elements of the returned array in PHP. 

$Array = new java_class("java.lang.reflect.Array");
for($i=0; $i<$Array->getLength($nameValues); $i++)
   echo $nameValues[i] . "\n";

should work if you have PHP5 (please see
tests.php5/arrayInterface.php).  In PHP4 the bridge uses the same method
as the ext/java: it copies all elements from the java array into a PHP
hashtable $nameValues.  I don't know at the moment how it is possible to
ask a PHP hash table for its length.


> It seems not possible to access the java.length property '$nameValues->length' 

The bridge accesses java via reflection.  For some reasons Sun decided
to wrap arrays differently (via a separate java.lang.reflect.Array
interface).


> 'foreach ($nameValues as $value) { echo "soemthing" }' work.

This should work in both PHP4 and PHP5, please see
tests.php5/iteratorInterface.php. The example uses a Map, but
getPhpMap() works for Arrays, Maps and Collections. 

Can you please set the log level to debug and send the result? I am
looking for the output of: logDebug("returning map for "+
value.getClass());

> Do I need to modify the native Java-Class so it provides another 
> java-interface(collection,ArrayList)?

Not necessary.  I think that for some reason the value is neither an
Array, nor a Map or Collection.  We'll see.


Jost 

Re: [Php-java-bridge-users] access elements of java-array

[Peter N. <pn...@kr...>]

Hi,

Jost Boekemeier schrieb:
> Hi,
> 
> 
>>public NameValue[] process_context
>>$nameValues = $activity->process_context();
>>So far I couldn't figure out a way how to iterate through all the 
>>elements of the returned array in PHP. 
> 
> 
> $Array = new java_class("java.lang.reflect.Array");
> for($i=0; $i<$Array->getLength($nameValues); $i++)
>    echo $nameValues[i] . "\n";
> 
> should work if you have PHP5 (please see
> tests.php5/arrayInterface.php).

PHP5 is quite OK.
Works perfect this way, Thx!
(I looked at all the tests and examples already but didn't manage to
adjust it to my problem correctly)

>  In PHP4 the bridge uses the same method
> as the ext/java: it copies all elements from the java array into a PHP
> hashtable $nameValues.  I don't know at the moment how it is possible to
> ask a PHP hash table for its length.

Sorry, no help from me. :-<

[...]
>>'foreach ($nameValues as $value) { echo "soemthing" }' work.
> 
> 
> This should work in both PHP4 and PHP5, please see
> tests.php5/iteratorInterface.php. The example uses a Map, but
> getPhpMap() works for Arrays, Maps and Collections. 
> 
> Can you please set the log level to debug and send the result? I am
> looking for the output of: logDebug("returning map for "+
> value.getClass());

OK, here you go, since the log-file is 70k I just put it online [1]
instead of posting it to the list.

What I am doing is only proof-of-concept for an exam, no
production-code. performancewise(and stability) I should probably rather
do a lot of the stuff in a native java-library instead. It involves
heavy usage of CORBA, so that might be causing the problem?
Although, it pretty much looks like it was really possible to use a java
CORBA-library within PHP.

>>Do I need to modify the native Java-Class so it provides another 
>>java-interface(collection,ArrayList)?
> 
> 
> Not necessary.  I think that for some reason the value is neither an
> Array, nor a Map or Collection.  We'll see.

hopefully it is of some help...

[1] http://www.niekom.de/pub/php-java-bridge.log

Big thx,
Peter