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/*****************************************************************************
* Copyright (c) 2010, 2015, 2019 LIFL, CEA LIST, Christian W. Damus, and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* LIFL - Initial API and implementation
* Christian W. Damus - bug 481149
* Vincent Lorenzo (CEA LIST) vincent.lorenzo@cea.fr - bug 548973
*****************************************************************************/
package org.eclipse.papyrus.infra.core.resource;
import java.io.IOException;
import org.eclipse.core.internal.resources.ResourceException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.emf.ecore.EObject;
/**
* Base class for models that can be created dynamically. Such models do not need to exist when others models are loaded.
* If the model is missing, it will be created.
* Furthermore, if the model is empty, it will not be saved.
*
*
* @author cedric dumoulin
*
* @param T
* Type of the roots of the model.
*/
public abstract class AbstractDynamicModel<T extends EObject> extends AbstractBaseModel {
/**
* boolean indicating than the resource contains or containing something previously and must be saved
*/
private boolean containsSomethingInThePast = false;
/**
*
* Constructor.
*
* @param modelKind
*/
public AbstractDynamicModel() {
super();
}
/**
* Load the model if it exist, or create a new one if it doesn't exist.
*
* @param fullPathWithoutExtension
*/
@SuppressWarnings("restriction")
@Override
public void loadModel(IPath fullPathWithoutExtension) {
// Try to load the model. It this fail, create a model.
try {
// Try to load the model
super.loadModel(fullPathWithoutExtension);
return;
} catch (RuntimeException e) {
// Check if the exception come from an non existing resource.
if (!(e.getCause() instanceof ResourceException)) {
throw e;
}
}
// The resource do not exist, crate it.
createModel(fullPathWithoutExtension);
// call registered snippets
startSnippets();
}
/**
* Save the model if it contains something.
*
* @see org.eclipse.papyrus.infra.core.resource.AbstractBaseModel#saveModel()
*
* @throws IOException
*/
@Override
public void saveModel() throws IOException {
// we check if the resource contains something
if (false == this.containsSomethingInThePast) {
this.containsSomethingInThePast = getResource().getContents().size() > 0;
}
/*
* the resource is empty and has always been empty
*/
if (false == this.containsSomethingInThePast && getResource().getContents().size() <= 0) {
return;
}
// Do the save
super.saveModel();
}
/**
* Add a root to this model.
*
* @param root
*/
public void addModelRoot(T root) {
getResource().getContents().add(root);
}
}
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