Am 05.10.2011 00:08, schrieb Marzia Forli:
I am a xml processing newbie, who have to read-transform-write some pretty big
xml files, and in my journey to the jaxp land I stumbled upon this wonderful
library... Here I ask for some kind advice regarding the my problem. For my
case let's imagine that we have a pretty big pom.xml and I would have to do the
following:
1) if under the tag 'repositories/repository/name' in the body is present
string 'snapshots' then rewrite the 'url' element stripping out the tags and
make it uppercase...
2) given the dependencies/dependency/groupId element if there is one dependency
with groupId = 'org.apache.cocoon.sax' then i have to get and rewrite all
dependencies elements
to make it simple if I found a desired element then I have to operate on
containing element rewriting it... Transformations I have to do a without the
xslt.
Maybe what I am asking seems trivial or plain stupid but I am not an expert
just learning... Is this library right for this task and if yes what would be
the right approach to handle this. Many many thanks
Cocoon 3 is certainly the right tool for that task.
Both SAX and StAX components will work fine and cause you no trouble
with file size, since they stream the file instead of loading it all
up-front.
You actually have a couple of options to achieve what you have mentioned:
1) You could implement the modifications using XSLT and use an existing
XSLT-Transformer (I saw your "without the XSLT", just added for
completeness)
2) You could implement your own transformer and express the
transformations in pure Java.
Both SAX and StAX can do this. I'd choose StAX for that (the
Navigators are quite handy!), but it's really what you prefer / know better.
You can take a look at
http://svn.apache.org/repos/asf/cocoon/cocoon3/trunk/cocoon-stax/src/test/java/org/apache/cocoon/stax/sample/src/ExampleComplexTransformer.java
as example for a StAXTransformer using Navigators.
3) You could always go with more advanced options like controllers, but
IMO that's really overkill for this.
Depending on how you want to execute this (embedded into another
application / stand-alone application / web-service) you will want to
use different Cocoon modules.
The easiest way for experimenting is using the Pipeline API directly.
This could look something like this:
Pipeline<SAXPipelineComponent> pipeline= new
NonCachingPipeline<SAXPipelineComponent>();
pipeline.addComponent(new XMLGenerator(new URL("file://path/to/pom.xml")));
pipeline.addComponent(new MyPomTransformer());
pipeline.addComponent(new XMLSerializer());
pipeline.setup(new FileOutputStream("/path/to/modified-pom.xml");
pipeline.execute();
Hope that helps a litte.
I'm sure you'll have further questions, tho... ;)
Steven
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