Thread: [Php-java-bridge-users] How to extend a Java class in PHP?

Hi everybody,

first of all thanks for this great piece of software that makes it  
easy to use powerful Java libs in a PHP based application. That's  
really awesome.

Currently I'm working on a PDF generation using iText and I'm  
surprised that it's quite easy to find my way around. But of course I  
wouldn't post this if there wasn't this one thing that is not working  
for me: writing a PHP class that derives from a Java class.

Before you guys scream "RTFM!", I really tried to find this out myself  
but all I could find was the FAQ file in the documentation. This  
points to java_closure() and to an example in the file script_api.php  
in the tests folder.

Reading the documentation of java_closure() and the example only the  
implementation of java interfaces in a PHP class is described (which  
will definitely be useful for me later - I'm sure).

So my question: can someone please explain how a PHP class can extend  
a Java class?

Any hint would be appreciated.

Thank you very much.

Regards,
Alexander Thomas

You could use the visitor- or the decorator design pattern to intercept the
method calls from your Java class.

It all depends on your requirements. If your java class is a data structure
with a few methods, I would use a visitor. To override specific methods from
the superclass I would use a decorator.

Please see a standard text book or wikipedia.org for details.

As far as the bridge is concerned, all you need is java_closure() to convert
your PHP object into a Java object. After that you can apply whatever
pattern you prefer to merge the two java instances.

Regards,
Jost Boekemeier

2. Jul 2009 12:52 nachm. schrieb am <
php...@li...>:

Hi everybody,

first of all thanks for this great piece of software that makes it
easy to use powerful Java libs in a PHP based application. That's
really awesome.

Currently I'm working on a PDF generation using iText and I'm
surprised that it's quite easy to find my way around. But of course I
wouldn't post this if there wasn't this one thing that is not working
for me: writing a PHP class that derives from a Java class.

Before you guys scream "RTFM!", I really tried to find this out myself
but all I could find was the FAQ file in the documentation. This
points to java_closure() and to an example in the file script_api.php
in the tests folder.

Reading the documentation of java_closure() and the example only the
implementation of java interfaces in a PHP class is described (which
will definitely be useful for me later - I'm sure).

So my question: can someone please explain how a PHP class can extend
a Java class?

Any hint would be appreciated.

Thank you very much.

Regards,
Alexander Thomas

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Thank you. Now I see how it has to be done.

Although it's not as fluffy as I would have wished but I guess it will  
work. :-)

Cheers,
Alexander Thomas

Am 02.07.2009 um 14:54 schrieb php...@li... 
:

> You could use the visitor- or the decorator design pattern to  
> intercept the
> method calls from your Java class.
>
> It all depends on your requirements. If your java class is a data  
> structure
> with a few methods, I would use a visitor. To override specific  
> methods from
> the superclass I would use a decorator.
>
> Please see a standard text book or wikipedia.org for details.
>
> As far as the bridge is concerned, all you need is java_closure() to  
> convert
> your PHP object into a Java object. After that you can apply whatever
> pattern you prefer to merge the two java instances.
>
> Regards,
> Jost Boekemeier
>
> 2. Jul 2009 12:52 nachm. schrieb am <
> php...@li...>:
>
> Hi everybody,
>
> first of all thanks for this great piece of software that makes it
> easy to use powerful Java libs in a PHP based application. That's
> really awesome.
>
> Currently I'm working on a PDF generation using iText and I'm
> surprised that it's quite easy to find my way around. But of course I
> wouldn't post this if there wasn't this one thing that is not working
> for me: writing a PHP class that derives from a Java class.
>
> Before you guys scream "RTFM!", I really tried to find this out myself
> but all I could find was the FAQ file in the documentation. This
> points to java_closure() and to an example in the file script_api.php
> in the tests folder.
>
> Reading the documentation of java_closure() and the example only the
> implementation of java interfaces in a PHP class is described (which
> will definitely be useful for me later - I'm sure).
>
> So my question: can someone please explain how a PHP class can extend
> a Java class?
>
> Any hint would be appreciated.
>
> Thank you very much.
>
> Regards,
> Alexander Thomas
>
> ------------------------------------------------------------------------------
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
> ------------------------------------------------------------------------------
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users

Well, if you use php 5.3 it is indeed easier. In PHP 5.3 you can autoload
Java libraries and import Java classes like ordinary PHP classes. The
following example extends java.lang.String:

<?php java_autoload();

use java\lang\String as JString;

class String extends JString {
  function toString(){
    return "I am " . parent::toString();
  }
  function __toString() {return this->toString();}
}

echo new String("foo");
?>
=> I am foo

Regards,
Jost Boekemeier

3. Jul 2009 10:46 vorm. schrieb am <
php...@li...>:

Thank you. Now I see how it has to be done.

Although it's not as fluffy as I would have wished but I guess it will
work. :-)

Cheers,
Alexander Thomas

Am 02.07.2009 um 14:54 schrieb php...@li...
:

> You could use the visitor- or the decorator design pattern to > intercept
the > method calls fr...

Ok. Now I'm impressed.

Are there any security issues that might go with java_autoload()?

Alex

Am 03.07.2009 um 12:46 schrieb php...@li... 
:

> Well, if you use php 5.3 it is indeed easier. In PHP 5.3 you can  
> autoload
> Java libraries and import Java classes like ordinary PHP classes. The
> following example extends java.lang.String:
>
> <?php java_autoload();
>
> use java\lang\String as JString;
>
> class String extends JString {
>  function toString(){
>    return "I am " . parent::toString();
>  }
>  function __toString() {return this->toString();}
> }
>
> echo new String("foo");
> ?>
> => I am foo
>
> Regards,
> Jost Boekemeier
>
> 3. Jul 2009 10:46 vorm. schrieb am <
> php...@li...>:
>
> Thank you. Now I see how it has to be done.
>
> Although it's not as fluffy as I would have wished but I guess it will
> work. :-)
>
> Cheers,
> Alexander Thomas
>
> Am 02.07.2009 um 14:54 schrieb php...@li...
> :
>
>> You could use the visitor- or the decorator design pattern to >  
>> intercept
> the > method calls fr...
> ------------------------------------------------------------------------------
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users

No. Its only slightly more work for the syntax transformer, that's all.

If you load additional libraries like java_autoload("c:/lucene.jar") the
first request must also load and cache the additional libs.

Regards,
Jost Boekemeier

3. Jul 2009 12:58 nachm. schrieb am <
php...@li...>:

Ok. Now I'm impressed.

Are there any security issues that might go with java_autoload()?

Alex

Am 03.07.2009 um 12:46 schrieb php...@li...
:

> Well, if you use php 5.3 it is indeed easier. In PHP 5.3 you can >
autoload > Java libraries an...

>
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php...@li...

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Thank you very much. That was indeed helpful.


Am 03.07.2009 um 13:06 schrieb php...@li... 
:

> No. Its only slightly more work for the syntax transformer, that's  
> all.
>
> If you load additional libraries like java_autoload("c:/lucene.jar")  
> the
> first request must also load and cache the additional libs.
>
> Regards,
> Jost Boekemeier
>
> 3. Jul 2009 12:58 nachm. schrieb am <
> php...@li...>:
>
> Ok. Now I'm impressed.
>
> Are there any security issues that might go with java_autoload()?
>
> Alex
>
> Am 03.07.2009 um 12:46 schrieb php...@li...
> :
>
>> Well, if you use php 5.3 it is indeed easier. In PHP 5.3 you can >
> autoload > Java libraries an...
>
>>
> ------------------------------------------------------------------------------
>> _________________...
>
>> php...@li...
>
>> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users----------------------------- 
>> ...
>
> php...@li...
>
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
> ------------------------------------------------------------------------------
> _______________________________________________
> php-java-bridge-users mailing list
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