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/*
* Copyright (c) 2014 CEA 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:
* Christian W. Damus (CEA) - Initial API and implementation
*
*/
package org.eclipse.papyrus.infra.ui.editor.reload;
import java.util.List;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import com.google.common.collect.Lists;
/**
* A convenient context object for {@link IEditorReloadListener}s to store in an {@link EditorReloadEvent} to capture and restore
* the selection state a selection provider;
*
* @param <V>
* the type of selection provider
* @param <T>
* the type of token used to restore the selection state
*/
public abstract class SelectionContext<V extends ISelectionProvider, T> {
private List<T> selection = Lists.newArrayList();
public SelectionContext(V structuredSelectionProvider) {
for (Object next : ((IStructuredSelection) structuredSelectionProvider.getSelection()).toList()) {
T token = token(next);
if (token != null) {
selection.add(token);
}
}
}
public void restore(V structuredSelectionProvider) {
List<Object> select = Lists.newArrayListWithCapacity(selection.size());
for (T next : selection) {
Object resolved = resolve(next);
if (resolved != null) {
select.add(resolved);
}
}
setSelection(structuredSelectionProvider, select);
}
T token(Object selectableElement) {
Object deresolved = deresolveSelectableElement(selectableElement);
return (deresolved == null) ? null : getToken(deresolved);
}
protected Object deresolveSelectableElement(Object selectableElement) {
return selectableElement;
}
protected abstract T getToken(Object object);
Object resolve(T token) {
Object deresolved = resolveToken(token);
return (deresolved == null) ? null : resolveSelectableElement(deresolved);
}
protected Object resolveSelectableElement(Object deresolved) {
return deresolved;
}
protected abstract Object resolveToken(T token);
protected void setSelection(V structuredSelectionProvider, List<?> selection) {
structuredSelectionProvider.setSelection(new StructuredSelection(selection));
}
}
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