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/*******************************************************************************
* Copyright (c) 2005, 2007 committers of openArchitectureWare and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* committers of openArchitectureWare - initial API and implementation
*******************************************************************************/
package org.eclipse.xtend.util.stdlib;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.eclipse.emf.ecore.EFactory;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.mwe.core.issues.Issues;
public class DanglingRefFinder {
private Set<EObject> set = new HashSet<EObject>();
public void handle(EObject o, Issues issues) {
if ( set.contains( o ) || shouldIgnore(o) ) return;
set.add( o );
EObject cont = o.eContainer();
if ( cont != null ) handle(cont, issues);
List<EReference> refs = o.eClass().getEAllReferences();
for (EReference reference : refs) {
if ( reference.isMany() ) {
Collection<EObject> col = (Collection<EObject>)o.eGet(reference);
for (EObject object : col) {
checkNullRef( o, reference, object, issues );
if ( object != null ) {
checkDangling( o, reference, object, issues );
handle( object, issues );
}
}
} else {
EObject object = (EObject)o.eGet(reference);
if ( object != null ) {
checkDangling( o, reference, object, issues );
handle( object, issues );
}
}
}
}
private boolean shouldIgnore(EObject o) {
boolean b = o instanceof EFactory;
return b;
}
private void checkNullRef(EObject ctx, EReference reference, EObject target, Issues issues) {
if ( target == null ) {
issues.addWarning(renderEObject(ctx)+"."+renderEReference(reference)+": contains a null object");
}
}
private void checkDangling(EObject ctx, EReference reference, EObject target, Issues issues) {
if ( shouldIgnore(target)) return;
if ( (target.eContainer() == null) && (target.eResource() == null) ) {
issues.addWarning(renderEObject(target)+" is not contained in an eContainer or Resource. Found in "+renderEObject(ctx)+"."+renderEReference(reference));
}
}
private String renderEObject(EObject ctx) {
DynamicEcoreHelper h = new DynamicEcoreHelper(ctx);
return h.getName(ctx)+"("+ctx.eClass().getName()+")";
}
private String renderEReference(EReference ctx) {
return ctx.getName()+" ["+(ctx.isContainer() ? "container=true":"container=false")+"]";
}
}
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