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/**
* Copyright (c) 2005, 2007, 2008 IBM Corporation 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:
* IBM - Initial API and implementation
* Obeo - adaptation
*/
package org.eclipse.sirius.tools.internal.validation;
import java.util.Map;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.emf.common.util.BasicDiagnostic;
import org.eclipse.emf.common.util.DiagnosticChain;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.util.EObjectValidator;
import org.eclipse.emf.validation.model.EvaluationMode;
import org.eclipse.emf.validation.model.IConstraintStatus;
import org.eclipse.emf.validation.service.IBatchValidator;
import org.eclipse.emf.validation.service.ModelValidationService;
/**
* An adapter that plugs the EMF Model Validation Service API into the
* {@link org.eclipse.emf.ecore.EValidator} API.
*
* @author cbrun
*/
public class EValidatorAdapter extends EObjectValidator {
/**
* Model Validation Service interface for batch validation of EMF elements.
*/
private final IBatchValidator batchValidator;
/**
* Initializes me.
*/
public EValidatorAdapter() {
super();
batchValidator = (IBatchValidator) ModelValidationService.getInstance().newValidator(EvaluationMode.BATCH);
batchValidator.setIncludeLiveConstraints(true);
batchValidator.setReportSuccesses(false);
}
/**
* {@inheritDoc}
*/
@Override
public boolean validate(final EObject eObject, final DiagnosticChain diagnostics, final Map<Object, Object> context) {
return validate(eObject.eClass(), eObject, diagnostics, context);
}
/**
* {@inheritDoc}
*/
@Override
public boolean validate(final EClass eClass, final EObject eObject, final DiagnosticChain diagnostics, Map<Object, Object> context) {
// first, do whatever the basic EcoreValidator does
super.validate(eClass, eObject, diagnostics, context);
IStatus status = Status.OK_STATUS;
// no point in validating if we can't report results
if (diagnostics != null) {
// if EMF Mode Validation Service already covered the sub-tree,
// which it does for efficient computation and error reporting,
// then don't repeat (the Diagnostician does the recursion
// externally). If there is no context map, then we can't
// help it
if (!hasProcessed(eObject, context)) {
status = batchValidator.validate(eObject, new NullProgressMonitor());
processed(eObject, context, status);
appendDiagnostics(status, diagnostics);
}
}
return status.isOK();
}
/**
* If we have a context map, record this object's <code>status</code> in it
* so that we will know later that we have processed it and its sub-tree.
*
* @param eObject
* an element that we have validated
* @param context
* the context (may be <code>null</code>)
* @param status
* the element's validation status
*/
private void processed(final EObject eObject, final Map<Object, Object> context, final IStatus status) {
if (context != null) {
context.put(eObject, status);
}
}
/**
* Determines whether we have processed this <code>eObject</code> before, by
* automatic recursion of the EMF Model Validation Service. This is only
* possible if we do, indeed, have a context.
*
* @param eObject
* an element to be validated (we hope not)
* @param context
* the context (may be <code>null</code>)
* @return <code>true</code> if the context is not <code>null</code> and the
* <code>eObject</code> or one of its containers has already been
* validated; <code>false</code>, otherwise
*/
private boolean hasProcessed(final EObject root, final Map<Object, Object> context) {
EObject eObject = root;
boolean result = false;
if (context != null) {
// this is O(NlogN) but there's no helping it
while (eObject != null) {
if (context.containsKey(eObject)) {
result = true;
eObject = null;
} else {
eObject = eObject.eContainer();
}
}
}
return result;
}
/**
* Converts a status result from the EMF validation service to diagnostics.
*
* @param status
* the EMF validation service's status result
* @param diagnostics
* a diagnostic chain to accumulate results on
*/
private void appendDiagnostics(final IStatus status, final DiagnosticChain diagnostics) {
if (status.isMultiStatus()) {
final IStatus[] children = status.getChildren();
for (IStatus element : children) {
appendDiagnostics(element, diagnostics);
}
} else if (status instanceof IConstraintStatus) {
diagnostics.add(new BasicDiagnostic(status.getSeverity(), status.getPlugin(), status.getCode(), status.getMessage(), ((IConstraintStatus) status).getResultLocus().toArray()));
}
}
}
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