Small examples for EMF-IncQuery part 1

ClassAttributeNames

pattern ClassAttributeNames(Cls,Name) = {
  EClass(Cls);
  EString(Name);
  // since eAttributes will refer to EAttribute, we can use its name feature
  EClass.eAttributes.name(Cls,Name); 
}

ClassAttributeNames2

pattern ClassAttributeNames(Cls,Name) = {
  EClass.eAttributes.name(Cls,Name); // Cls is EClass, Name is EString
}

ClassAttributes

pattern ClassAttributes(Cls,Attr) = {
  EClass(Cls);
  EAttribute(Attr);

  // path expression for indicating that there is an eAttributes relation between Cls and Attr
  EClass.eAttributes(Cls,Attr); 
}

ClassAttributes2

pattern ClassAttributes(Cls, Attr : EAttribute) = { // equal to EAttribute(Attr) in the body
  EClass.eStructuralFeatures(Cls,Attr); 
}

EClassWithGivenName

pattern EClassWithGivenName(Cls : EClass) = {
  EClass.name(Cls,Name);
  check((Name as String).equals("MyClass"));
}

EClassWithGivenName2

pattern EClassWithGivenName(Cls : EClass) = {
  EClass.name(Cls,"MyClass");
}

hello.eiq

package pckgname

pattern HelloIncQuery() = {}

HelloIncQuery

pattern HelloIncQuery(Obj) = { // patterns may have an aritrary number of named parameters
  EObject(Obj); // type constraint on Obj variable
}

import

// for registered EPackages, using the nsUri, content assist is available
import "http://www.eclipse.org/emf/2002/Ecore"