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Traverse an EMF tree [message #541873]

Tue, 22 June 2010 20:54

bachra04

Messages: 148
Registered: April 2010

Senior Member

Hi Experts,

I want to traverse an EMF tree to get all the classes and put them inside a map. Is there any sample code doing that?

Thanks

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Re: Traverse an EMF tree [message #541894 is a reply to message #541873]

Wed, 23 June 2010 02:13

Bryan Hunt

Messages: 366
Registered: July 2009

Senior Member

Yes, there is a very simple way to do this. Assuming you generated your code from an ecore model, you whould have generated a switch class in the util package. Create a class that extends that switch class and override the methods for your parent and child types. For example:

public class ModelTraversal extends ModelSwitch<Boolean>
{
  @Override
  public Boolean caseParentType(ParentType object)
  {
    for(AbstractType child : object.getChildren())
      doSwitch(child);

    return Boolean.TRUE;
  }

  @Override
  public Boolean case ChildType(ChildType object)
  {
    // do something with the child
    return Boolean.TRUE;
  }
}

and to use the switch:

ModelTraversal mt = new ModelTraversal();
mt.doSwitch(model);

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Re: Traverse an EMF tree [message #541928 is a reply to message #541873]

Wed, 23 June 2010 08:53

Cedric Brun

Messages: 431
Registered: July 2009

Senior Member

Hi,

EMF perfectly fits with Google Collections, you can write somethings like

Iterator<MyClass> it =
Iterators.filter(root.eAllContents(),my.package.MyClass.clas s);
while (it.hasNext())
{
MyClass clazz = it.next();
//process the class
}

bachra04 wrote:

> Hi Experts,
>
> I want to traverse an EMF tree to get all the classes and put them inside
> a map. Is there any sample code doing that?
>
> Thanks

http://cedric.brun.io news and articles on eclipse and eclipse modeling.

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Re: Traverse an EMF tree [message #542379 is a reply to message #541928]

Thu, 24 June 2010 16:18

bachra04

Messages: 148
Registered: April 2010

Senior Member

Are you referring here to java.util.Iterator?
I couldn't find filter method ?

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Re: Traverse an EMF tree [message #542381 is a reply to message #542379]

Thu, 24 June 2010 16:21

bachra04

Messages: 148
Registered: April 2010

Senior Member

Sorry I got it Google collection library Surprised

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Re: Traverse an EMF tree [message #542387 is a reply to message #542379]

Thu, 24 June 2010 16:34

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

com.google.common.collect.Iterators.

bachra04 wrote:
> Are you referring here to java.util.Iterator?
> I couldn't find filter method ?

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Traverse an EMF tree [message #542411 is a reply to message #542387]

Thu, 24 June 2010 18:14

bachra04

Messages: 148
Registered: April 2010

Senior Member

I had issues with adding to my created plugin, is there any documentation or example on how to add this library toyour plugin ?

Thanks

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Re: Traverse an EMF tree [message #542417 is a reply to message #542411]

Thu, 24 June 2010 18:24

bachra04

Messages: 148
Registered: April 2010

Senior Member

I had the following error:

Package 'com.google.common.collect' does not exist in this plug-in

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Re: Traverse an EMF tree [message #542420 is a reply to message #542417]

Thu, 24 June 2010 18:49

bachra04

Messages: 148
Registered: April 2010

Senior Member

More info:

- Access restriction: The type Iterators is not accessible due to restriction on required library C:\dev\google-collect-0.5-20080322.110711-2.jar
- Access restriction: The method filter(Iterator<?>, Class<EObject>) from the type Iterators is not accessible due to restriction on required library C:\dev\google-
collect-0.5-20080322.110711-2.jar

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Re: Traverse an EMF tree [message #542432 is a reply to message #542420]

Thu, 24 June 2010 19:38

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

It's not an EMF question. I think the Orbit project has a p2 repository
with a bundlized version of this library.

bachra04 wrote:
> More info:
>
> - Access restriction: The type Iterators is not accessible due to
> restriction on required library
> C:\dev\google-collect-0.5-20080322.110711-2.jar
> - Access restriction: The method filter(Iterator<?>,
> Class<EObject>) from the type Iterators is not accessible due to
> restriction on required library C:\dev\google-
> collect-0.5-20080322.110711-2.jar

Ed Merks
Professional Support: https://www.macromodeling.com/

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