Some help with AcroFields.setFieldCache()?

[msinatl]

Can anyone help me to better understand the use of AcroFields.setFieldCache()
when filling form fields?

I have looked at the Subscribe.java example
(http://itextpdf.com/examples/iia.php?id=161) and the example code in the
JavaDoc
(http://api.itextpdf.com/itext/com/itextpdf/text/pdf/AcroFields.html#setFieldCache()).
In these examples, an empty HashMap is being created and then assigned to
the AcroFields object -- but what I don't understand is how appearances are
loaded into the HashMap.  The code examples don't really make it clear
what's happening with the cache.

Is there anything that I need to do besides loading an empty HashMap into
the object in order to benefit from caching?

Thanks!



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[iText Info]

On 12/09/2012 17:25, msinatl wrote:
> I don't understand is how appearances are
> loaded into the HashMap.
The cache is loaded automagically the first time an appearance needs to
be created.
Isn't that how a cache usually works?

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[msinatl]

In that case, why not just instantiate the empty HashMap at the same time AcroFields.getFields() is called and save the developer the extra lines of code?

From:        "1T3XT BVBA [via iText - General]" <[hidden email]>
To:        msinatl <[hidden email]>
Date:        09/12/2012 01:01 PM
Subject:        Re: Some help with AcroFields.setFieldCache()?

---

On 12/09/2012 17:25, msinatl wrote:
> I don't understand is how appearances are
> loaded into the HashMap.
The cache is loaded automagically the first time an appearance needs to
be created.
Isn't that how a cache usually works?

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[iText Info]

On 12/09/2012 19:03, msinatl wrote:

In that case, why not just instantiate the empty HashMap at the same time AcroFields.getFields() is called and save the developer the extra lines of code?

That wouldn't make sense, would it?
You'd be making a new HashMap for every AcroFields instance.
That wouldn't be a cache, that would be overhead.

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