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/*****************************************************************************
* Copyright (c) 2012 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.gmfdiag.css.engine;
import java.io.IOException;
import java.net.URL;
import org.eclipse.core.databinding.observable.ChangeEvent;
import org.eclipse.core.databinding.observable.IChangeListener;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.infra.gmfdiag.common.helper.DiagramHelper;
import org.eclipse.papyrus.infra.gmfdiag.css.helper.SemanticElementHelper;
import org.eclipse.papyrus.infra.gmfdiag.css.notation.CSSDiagram;
import org.eclipse.papyrus.infra.gmfdiag.css.stylesheets.StyleSheet;
import org.eclipse.papyrus.infra.gmfdiag.css.stylesheets.StyleSheetReference;
import org.w3c.dom.Element;
/**
* A CSS Engine associated to a Diagram.
*
* This Engine is a child of a ModelCSSEngine.
*
* @author Camille Letavernier
*/
@SuppressWarnings("restriction")
public class DiagramCSSEngine extends ExtendedCSSEngineImpl implements IChangeListener {
private CSSDiagram diagram;
/**
* Constructor
*
* Builds a DiagramCSSEngine for a given CSSDiagram
*
* @param parent
* The diagram's parent CSSEngine. Its stylesheets will be inherited
* @param diagram
* This engine's diagram
*/
public DiagramCSSEngine(ExtendedCSSEngine parent, CSSDiagram diagram) {
super(parent);
this.diagram = diagram;
setElementProvider(new GMFElementProvider());
}
@Override
protected void reloadStyleSheets() {
styleSheets.clear();
for(StyleSheet styleSheet : diagram.getStyleSheets()) {
//Do not call super#addStyleSheet(styleSheet) to avoid a StackOverFlow
styleSheets.add(styleSheet);
}
}
@Override
protected void parseStyleSheet(StyleSheetReference styleSheet) throws IOException {
String path = styleSheet.getPath();
if(path.startsWith("/")) { //Either plug-in or workspace
path = "platform:/resource" + path;
URL url = new URL(path);
try {
url.openConnection();
} catch (IOException ex) {
path = "platform:/plugin" + styleSheet.getPath();
}
} else {
URI uri = URI.createURI(styleSheet.getPath());
uri = uri.resolve(diagram.eResource().getURI());
path = uri.toString();
}
URL url = new URL(path);
parseStyleSheet(url.openStream());
}
/**
* {@inheritDoc}
*
* Returns the GMF Notation EObject
*/
@Override
public EObject getNativeWidget(Object element) {
element = super.getNativeWidget(element);
if(element == null) {
return null;
}
if(!(element instanceof EObject)) {
throw new IllegalArgumentException("Unknown element : " + element);
}
return (EObject)element; //GMFElement
}
public void handleChange(ChangeEvent event) {
resetCache();
DiagramHelper.refreshDiagrams(); //FIXME: Should be contextual. We should only refresh the editor(s) containing this Diagram
}
@Override
public Element getElement(Object node) {
if(node == null) {
return null;
}
EObject notationElement = getNativeWidget(node);
View canonicalNotationElement = SemanticElementHelper.findPrimaryView(notationElement);
//A View and a Compartment associated to the same Semantic Element
//must have the same XML Element. They share the same children.
//This is required to map the Semantic model (Used by the CSS selectors)
//to the Notation model (Used by the CSS properties)
return super.getElement(canonicalNotationElement);
}
}
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