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CanCreateDiagramPredicate.java
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CanCreateDiagramPredicate.java
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/*******************************************************************************
* Copyright (c) 2019, 2024 Obeo.
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.sirius.components.compatibility.emf.diagrams;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Predicate;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.sirius.components.emf.DomainClassPredicate;
import org.eclipse.sirius.components.interpreter.AQLInterpreter;
import org.eclipse.sirius.components.interpreter.Result;
import org.eclipse.sirius.components.representations.IRepresentationDescription;
import org.eclipse.sirius.components.representations.VariableManager;
import org.eclipse.sirius.diagram.description.DiagramDescription;
/**
* Predicate to test the ability to create a diagram according to the given {@Link VariableManager}.
*
* @author hmarchadour
*/
public class CanCreateDiagramPredicate implements Predicate<VariableManager> {
private final DiagramDescription diagramDescription;
private final AQLInterpreter interpreter;
public CanCreateDiagramPredicate(DiagramDescription diagramDescription, AQLInterpreter interpreter) {
this.diagramDescription = Objects.requireNonNull(diagramDescription);
this.interpreter = Objects.requireNonNull(interpreter);
}
@Override
public boolean test(VariableManager variableManager) {
boolean result = false;
String domainClass = this.diagramDescription.getDomainClass();
// @formatter:off
Optional<EClass> optionalEObject = variableManager.get(IRepresentationDescription.CLASS, EClass.class)
.filter(new DomainClassPredicate(domainClass));
// @formatter:on
if (optionalEObject.isPresent()) {
String preconditionExpression = this.diagramDescription.getPreconditionExpression();
if (preconditionExpression != null && !preconditionExpression.isBlank()) {
Result preconditionResult = this.interpreter.evaluateExpression(variableManager.getVariables(), preconditionExpression);
result = preconditionResult.asBoolean().orElse(false);
} else {
result = true;
}
}
return result;
}
}