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/*****************************************************************************
* Copyright (c) 2010 CEA LIST.
*
* 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.constraints.runtime;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.infra.constraints.Activator;
import org.eclipse.papyrus.infra.constraints.ConstraintDescriptor;
import org.eclipse.papyrus.infra.constraints.DisplayUnit;
import org.eclipse.papyrus.infra.constraints.constraints.Constraint;
/**
* The default, generic implementation for ConstraintEngine
*
* @author Camille Letavernier
* @param <E>
* The type of DisplayUnit managed by this Constraint Engine
*/
public abstract class DefaultConstraintEngine<E extends DisplayUnit> implements ConstraintEngine<E> {
/**
* The constraints instantiated by this Engine
*/
protected final Set<Constraint> constraints = new LinkedHashSet<Constraint>();
public abstract void refresh();
public synchronized void addConstraint(ConstraintDescriptor descriptor) {
Constraint constraint = ConstraintFactory.getInstance().createFromModel(descriptor);
if(constraint != null) {
constraints.add(constraint);
}
}
public synchronized Set<E> getDisplayUnits(final ISelection forSelection) {
Set<E> result = new HashSet<E>();
IStructuredSelection selection;
if(forSelection instanceof IStructuredSelection) {
selection = (IStructuredSelection)forSelection;
} else {
return result;
}
Set<Constraint> matchedConstraints = match(selection);
return getDisplayUnits(matchedConstraints);
}
private Set<Constraint> match(final IStructuredSelection selection) {
Set<Constraint> matchedConstraints = new LinkedHashSet<Constraint>();
if(selection.isEmpty()) {
return matchedConstraints;
}
for(Constraint c : constraints) {
try {
if(c.match(selection)) {
matchedConstraints.add(c);
}
} catch (Throwable ex) {
String errorMessage = String.format("An error occurred when executing the matching constraint %s. This constraint will be ignored", c.getDescriptor().getName());
Activator.log.error(errorMessage, ex);
}
}
// String logValue;
//
// logValue = "Filtered Constraints : "; //$NON-NLS-1$
// for(Constraint constraint : matchedConstraints) {
// logValue += constraint.getDescriptor().getName() + ", ";
// }
// Activator.log.warn(logValue);
resolveConstraintConflicts(matchedConstraints);
// logValue = "Filtered Constraints : "; //$NON-NLS-1$
// for(Constraint constraint : matchedConstraints) {
// logValue += constraint.getDescriptor().getName() + ", ";
// }
//
// Activator.log.warn(logValue);
return matchedConstraints;
}
private void resolveConstraintConflicts(final Set<Constraint> matchedConstraints) {
Set<Constraint> constraintsSet = new HashSet<Constraint>(matchedConstraints);
for(Constraint c : constraintsSet) {
for(Constraint c2 : constraintsSet) {
if(c == c2) {
continue;
}
if(c.getDescriptor().getOverriddenConstraints().contains(c2.getDescriptor())) {
matchedConstraints.remove(c2);
continue;
}
if(c2.getDescriptor().isOverrideable() && c.overrides(c2)) {
matchedConstraints.remove(c2);
continue;
}
}
}
}
private Set<E> getDisplayUnits(final Set<Constraint> matchedConstraints) {
Set<E> displayUnits = new LinkedHashSet<E>();
for(Constraint c : matchedConstraints) {
displayUnits.add((E)c.getDescriptor().getDisplay());
}
return displayUnits;
}
}
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