Efficient XML Parsing For Count Using Java Hashmap?

Aug 20, 2014

I am kind of new to Java. I have a query.. look at it. Have an xml like

<ProductList>
<Product Quality='Good' color='Blue'>
<Details ItemID='1001'/>
</Product>
...
..
</ProductList>

The <Product> tags can run into hundreds or thousands. Quality can have values like Good, Bad, Damaged. Color can also have various values (Blue, Red ..)

ItemID can repeat or can be different. So I want group by ItemID->Color->Good count or BadCount and TotalCount as below.

I want to get a sum like

<ProductList>
<ProductType ItemID="1001">
<Product_Detail CountGood="1" CountBad="2" CountTotal="3" Type="Blue"/>
</ProductType>
...
...
</ProductList>

I think using Hashmaps (Hashmap1 for ItemID, Hashmap2 for color, Hashmap3 for quality) may do the work. But I have to parse the xml number of ItemID's multiply-by number of colors multiply by various colors times for this.

Any better algorithm is there in performance perspective using Java.

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