How to implement a lazy getObject method like Hibernate?

Question

I have a very large XML file from a legacy software. Its size is something about 9 GB.

I need to get parts of this XML in a lazy way, just like Hibernate does with databases. I already have POJOs in hierarchical structure to represent the records inside the XML and want to retrieve data from XML from POJO's 'get' methods since I have the Root element. Of course I can create a Manager class or sort of, but I want the same as the Hibernate does with lazy load.

Is there any pattern or library that could be used to change the behavior of a class method, exactly as Lazy Load in Hibernate?

You can use proxy pattern to achieve this, return a proxy instance and call actual method when really required — Jigar Joshi
– Jigar Joshi, Commented Jun 20, 2014 at 17:31

Markus Malkusch · Accepted Answer · 2014-06-21 09:59:08Z

2

I think your motivation is that huge amount of data. I don't know of any such library and I imagine this as a difficult task, as XML is very hard to point to the needed fragments.

The best I can imagine is event based processing (e.g. SAX) and transform it into an appropriate database scheme. The rest is ordinary JPA (e.g. hibernate) mapping.

edited Jun 21, 2014 at 9:59

answered Jun 20, 2014 at 17:38

Markus Malkusch

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2 Comments

adamitj Over a year ago

The time to insert all data into database tables should take too much time and storage (there is 1 XML file per day). But I agree, it's an option that I'm considering.

Markus Malkusch Over a year ago

You could omit the transformation step and work directly event based with the XML file without your POJOs.

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