I have created a plugin where i am in a need of finding the changes inside the method. I have used JavaCore.addElementChangedListener to listen to the changes happening in the java file. but i cant get the changes inside the method. I want to get the changes inside the method .I have gone through the How to capture changes inside methods in an Eclipse plugin but i am not able to get the subtrees and changes fileds . Actually am not able to get the actual concept . can you please help me to get the changes in the method?
Finally some how I found the solution to identify the changes happening inside the method but it gives simultaneously . I store it in a hash map as specified in the How to capture changes inside methods in an Eclipse plugin answer and by using IResourceChangeEvent.POST_CHANGE we can get the collection of changes happened up to the user saves the file.
public void elementChanged(ElementChangedEvent event) {
IJavaElementDelta delta= event.getDelta();
if (delta != null) {
delta.getCompilationUnitAST().accept(new ASTVisitor() {
@Override
public boolean visit(MethodDeclaration node) {
String name = ( (TypeDeclaration) node.getParent()).getName()
.getFullyQualifiedName() + "." + node.getName().getFullyQualifiedName();
boolean changedmethodvalue = false;
if (subtrees.containsKey(name)){
changedmethodvalue = !node.subtreeMatch(new ASTMatcher(),subtrees.get(Name));
if(changedmethodvalue){
System.out.println("method changed"+Name+":"+changedmethodvalue);
/**
* Store the changed method inside the hash map for future reflection.
*/
changed.put(Name, (IMethod) node.resolveBinding().getJavaElement());
/**
* setting up the hash map value each time changes happened.
*
*/
ModificationStore.setChanged(changed);
}
}
else{
// No earlier entry found, definitely changed
methodHasChanged = true;
System.out.println("A new method is added");
}
}
/**
* updating the subtree structure
*/
subtrees.put(mName, node);
return true;
}
});
}
}
}
When the user invokes save option we can get the collection of method name and its location from the hash map
public class InvokeSynchronizer implements IResourceDeltaVisitor{
private static HashMap<String, IMethod> methodtoinvoke = new HashMap<String, IMethod>();
public boolean visit(IResourceDelta delta) {
IResource res = delta.getResource();
switch (delta.getKind()) {
case IResourceDelta.ADDED:
System.out.println("ADDED: ");
break;
case IResourceDelta.CHANGED:
/**
* methodtoinvoke is a hash map values got from the modification store class.
*/
methodtoinvoke=ModificationStore.getChanged();
Iterator it = methodtoinvoke.entrySet().iterator();
while (it.hasNext()) {
Map.Entry pairs = (Map.Entry)it.next();
// System.out.println(pairs.getKey() + " = " + pairs.getValue());
IMethod methods=(IMethod) pairs.getValue();
//IResource resource=(IResource) methods;
System.out.println("I resource value"+res);
System.out.println("\nlocation of the method:"+methods.getParent().getResource().toString());
System.out.println("\n\nmethod name ::"+methods.getElementName());
it.remove(); // avoids a ConcurrentModificationException
}}
return true;
}
}