Re: [Php-java-bridge-users] Conversion of array to HashMap

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

On Nov 3, 2006, at 1:54 PM, php-java-bridge- 
us...@li... wrote:

> I'm using php-java-bridge-3.1.8, and have run into something really
> confusing when creating
> HashMaps.
>
> I have a method in a Java class that accepts a HashMap.  If I  
> create an
> empty HashMap in
> php and add elements with put like this:
>
> $h = new java("java.util.HashMap");
> $h->put(0 , "Some Text");
>
> ...and pass that to my class I can get it's value with get(0) no  
> problem.
> However if I create
> the HashMap in php with something like this:
>
> $h = new java("java.util.HashMap", array(0=>"Some Text"));
>
> ...and pass that to the java class it wasn't able to get the key  
> 0.  Also,
> trying to use $h->get(0)
> within php didn't work either.

Since the PHP array type is not directly compatible with a HashMap -  
even though they are basically the same concept of key/value pairs -  
you have to be careful when moving values back and forth between the  
two.  I have found that building a PHP array with all the values I  
need first and then using a simple FOREACH loop to populate my Java  
HashMap works great.  Here's an example:

<?php
...
// build a request array
$request['key1'] = "value1";
$request['key2'] = "true";
$request['key3'] = 2342;
$request['key4'] = "internet";

// == Prepare the request HashMap for Java ==
$j_request = new Java("java.util.HashMap");
foreach ($request AS $key => $val) {
	$j_request->put($key,stripslashes($val));
}

// To get your PHP array back from a HashMap just use the following
$original_request_array = java_values($j_request);

...
?>
Since Java is so strongly "typed" I have also run into a lot of  
problems with PHP's loose typing and Java.

Hope this helps a bit.

>
> What I found is that the key to the resulting HashMap using the latter
> syntax isn't an
> Integer 0, but rather an Object of the class
> php.java.bridge.Request$PhpArrayKey.
>
> I see that creating a Vector directly from an array in a similar  
> manner such
> as:
>
> $h = new java("java.util.Vector", array(44.6, 5, 5.6, "some string"));
>
> ...works fine, and I get elements with all the expected data types  
> in java.
>
> Is this the expected behavior and possible something I missed in the
> documentation?
Nope.  This is just an issue with data types between PHP and Java.  I  
don't think you missed anything in the docs.  The doc's for the  
Bridge don't really discuss the intricacies of handling different  
data types between PHP and Java.  Maybe that is a good section to add  
to the documentation.  I'll add that to my list.

Jon Koerber
  (spladow)

> It had
> me going for hours.  I see that there's at least one other email on  
> the list
> were someone
> couldn't read a value with get()...possibly the same issue.
>
> Thanks in advance.
>
> Tom
>
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