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/*****************************************************************************
* Copyright (c) 2013, 2015 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 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
* Christian W. Damus (CEA) - bug 429422
* Christian W. Damus - bug 461629
*
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.css.engine;
import java.io.IOException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.resources.ProjectScope;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.papyrus.infra.gmfdiag.common.helper.DiagramHelper;
import org.eclipse.papyrus.infra.gmfdiag.css.Activator;
import org.eclipse.papyrus.infra.gmfdiag.css.stylesheets.StyleSheet;
import org.eclipse.papyrus.infra.gmfdiag.css.stylesheets.StyleSheetReference;
/**
* A CSS Engine for the current Eclipse Project
*
* Note: Some models are not necessarily stored in a Project (e.g. CDO Models)
*
* @author Camille Letavernier
*
*/
public class ProjectCSSEngine extends ExtendedCSSEngineImpl {
private IResourceChangeListener resourceListener = new IResourceChangeListener() {
@Override
public void resourceChanged(IResourceChangeEvent event) {
if (project != null) {
try {
if (event != null && event.getDelta() != null) {
event.getDelta().accept(new IResourceDeltaVisitor() {
@Override
public boolean visit(IResourceDelta delta) throws CoreException {
if (delta.getResource().equals(stylesheetPreferences)) {
ProjectCSSEngine.this.reset();
DiagramHelper.scheduleRefresh();
return false;
}
return true;
}
});
}
} catch (CoreException ex) {
Activator.log.error(ex);
}
}
}
};
/**
* The file name of the EMF Model containing the {@link StyleSheet}s.
* It will be stored in the project's preferences scope (Typically the .settings folder)
*
* @see {@link ProjectScope}
*/
public static final String PROJECT_STYLESHEETS = "stylesheets.xmi"; //$NON-NLS-1$
/**
* The Engine's project. May be null or closed, or may not exist
*/
protected IProject project;
protected IFile stylesheetPreferences;
/**
* @deprecated Use the {@link #createEngine(Resource)} method, instead, which returns {@code null} for non-existent projects
*/
@Deprecated
public ProjectCSSEngine(Resource modelResource) {
super(WorkspaceCSSEngine.instance);
URI resourceURI = modelResource.getURI();
if (resourceURI.isPlatformResource()) {
String platformString = resourceURI.toPlatformString(true);
try {
IPath workspacePath = new Path(platformString);
this.project = ResourcesPlugin.getWorkspace().getRoot().getFile(workspacePath).getProject();
IPath preferencesAbsolutePath = new ProjectScope(project).getLocation().append(PROJECT_STYLESHEETS);
IPath projectRelativePath = preferencesAbsolutePath.makeRelativeTo(project.getLocation());
stylesheetPreferences = project.getFile(projectRelativePath);
ResourcesPlugin.getWorkspace().addResourceChangeListener(resourceListener);
} catch (Exception ex) {
Activator.log.error(ex);
}
}
}
protected ProjectCSSEngine(IProject project) {
super(WorkspaceCSSEngine.instance);
this.project = project;
try {
IPath preferencesAbsolutePath = new ProjectScope(project).getLocation().append(PROJECT_STYLESHEETS);
IPath projectRelativePath = preferencesAbsolutePath.makeRelativeTo(project.getLocation());
this.stylesheetPreferences = project.getFile(projectRelativePath);
project.getWorkspace().addResourceChangeListener(resourceListener);
} catch (Exception ex) {
Activator.log.error(ex);
}
}
/**
* Creates the project-scoped CSS engine for the project containing the specified {@code modelResource}, if such
* project actually exists.
*
* @param modelResource
* a model resource
* @return the containing project's CSS engine, or {@code null} if the containing project does not exist
*/
public static ProjectCSSEngine createEngine(Resource modelResource) {
ProjectCSSEngine result = null;
URI resourceURI = modelResource.getURI();
if (resourceURI.isPlatformResource()) {
String platformString = resourceURI.toPlatformString(true);
try {
IPath workspacePath = new Path(platformString);
IProject project = ResourcesPlugin.getWorkspace().getRoot().getFile(workspacePath).getProject();
if (project.isAccessible()) {
result = new ProjectCSSEngine(project);
}
} catch (Exception ex) {
// It's OK. We'll return a null result because it wouldn't be a valid CSS engine
Activator.log.error(ex);
}
}
return result;
}
@Override
public void dispose() {
ResourcesPlugin.getWorkspace().removeResourceChangeListener(resourceListener);
super.dispose();
}
@Override
protected void reloadStyleSheets() {
styleSheets.clear();
if (project == null || !project.exists() || !project.isOpen()) {
return;
}
if (stylesheetPreferences == null || !stylesheetPreferences.exists()) {
return;
}
IPath workspacePath = stylesheetPreferences.getFullPath();
URI workspaceURI = URI.createPlatformResourceURI(workspacePath.toString(), true);
ResourceSet resourceSet = new ResourceSetImpl();
try {
Resource stylesheetsResource = resourceSet.getResource(workspaceURI, true);
for (EObject rootElement : stylesheetsResource.getContents()) {
if (rootElement instanceof StyleSheet) {
// Do not call super#addStyleSheet(styleSheet) to avoid a StackOverFlow
styleSheets.add((StyleSheet) rootElement);
}
}
} catch (Exception ex) {
Activator.log.error(ex);
}
}
@SuppressWarnings("restriction")
@Override
protected void parseStyleSheet(StyleSheetReference styleSheet) throws IOException {
String path = styleSheet.getPath();
if (path.startsWith("/")) { //$NON-NLS-1$
super.parseStyleSheet(styleSheet);
} else {
// Parse relative paths from the Project
if (project != null && project.exists() && project.isOpen()) {
IFile file = project.getFile(path);
if (file.exists()) {
try {
parseStyleSheet(file.getContents());
} catch (CoreException ex) {
Activator.log.error(ex);
}
}
}
}
}
/**
* @see org.eclipse.papyrus.infra.gmfdiag.css.engine.ExtendedCSSEngineImpl#getCascadeScope()
*
* @return
*/
@Override
public CascadeScope getCascadeScope() {
return CascadeScope.AUTHOR;
}
}
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