/*******************************************************************************
* Copyright (c) 2011 Subgraph.
* 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:
* Subgraph - initial API and implementation
******************************************************************************/
package com.subgraph.vega.ui.web.views;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.Viewer;
import com.subgraph.vega.api.events.IEvent;
import com.subgraph.vega.api.events.IEventHandler;
import com.subgraph.vega.api.model.IWorkspace;
import com.subgraph.vega.api.model.web.IWebEntity;
import com.subgraph.vega.api.model.web.IWebHost;
import com.subgraph.vega.api.model.web.NewWebEntityEvent;
import com.subgraph.vega.api.model.web.UpdatedWebEntityEvent;
import com.subgraph.vega.ui.tree.web.WebModelAdapter;
public class WebsiteContentProvider implements ITreeContentProvider {
private final Object[] NULL_OB = new Object[0];
private IWorkspace workspace;
private StructuredViewer viewer;
private final IEventHandler modelListener = createModelListener();
private final List<IWebHost> webHosts = new ArrayList<IWebHost>();
private final WebModelAdapter treeAdapter = new WebModelAdapter();
public Object[] getChildren(Object parentElement) {
return treeAdapter.getChildren(parentElement);
}
public Object getParent(Object element) {
return treeAdapter.getParent(element);
}
public boolean hasChildren(Object element) {
return treeAdapter.hasChildren(element);
}
public Object[] getElements(Object inputElement) {
if(inputElement instanceof IWorkspace) {
return webHosts.toArray(NULL_OB);
} else {
return treeAdapter.getChildren(inputElement);
}
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
if(newInput == null)
setNullWorkspace();
else if(newInput instanceof IWorkspace)
setNewWorkspaceAndViewer((IWorkspace) newInput, (StructuredViewer)viewer);
}
private void setNullWorkspace() {
webHosts.clear();
workspace = null;
}
private void setNewWorkspaceAndViewer(IWorkspace newWorkspace, StructuredViewer newViewer) {
if(newWorkspace != workspace) {
if(workspace != null) {
workspace.getWebModel().removeChangeListener(modelListener);
}
workspace = newWorkspace;
webHosts.clear();
workspace.getWebModel().addChangeListenerAndPopulate(modelListener);
this.viewer = newViewer;
}
}
public void dispose() {
}
private IEventHandler createModelListener() {
return new IEventHandler() {
public void handleEvent(IEvent event) {
if(event instanceof NewWebEntityEvent)
handleNewWebEntity((NewWebEntityEvent) event);
else if(event instanceof UpdatedWebEntityEvent)
handleUpdatedWebEntity((UpdatedWebEntityEvent) event);
}
};
}
private void handleNewWebEntity(NewWebEntityEvent event) {
final IWebEntity entity = event.getEntity();
if(entity instanceof IWebHost) {
webHosts.add((IWebHost) entity);
}
refreshViewer();
}
private void handleUpdatedWebEntity(UpdatedWebEntityEvent event) {
refreshElement(event.getEntity());
}
private void refreshElement(final IWebEntity element) {
guiRun(new Runnable() {
@Override
public void run() {
viewer.refresh(element, true);
}
});
}
private void refreshViewer() {
guiRun(new Runnable() {
@Override
public void run() {
viewer.refresh(true);
}
});
}
private void guiRun(Runnable runnable) {
if(viewer != null && !viewer.getControl().isDisposed()) {
synchronized(viewer) {
viewer.getControl().getDisplay().asyncExec(runnable);
}
}
}
}