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/*******************************************************************************
* Copyright (c) 2012 Mia-Software.
* 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:
* Nicolas Bros (Mia-Software) - Bug 379683 - customizable Tree content provider
* Nicolas Bros (Mia-Software) - Bug 380407 - Missing since tag on CustomizedContentProviderUtils
*******************************************************************************/
package org.eclipse.papyrus.emf.facet.custom.ui;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.papyrus.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.EAttributeTreeElement;
import org.eclipse.papyrus.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.EObjectTreeElement;
import org.eclipse.papyrus.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.EReferenceTreeElement;
/**
* A companion utility class for {@link ICustomizedTreeContentProvider}
*
* @since 0.2
*/
public final class CustomizedContentProviderUtils {
private CustomizedContentProviderUtils() {
// utility class
}
/**
* Replace proxy objects by their underlying model elements in the given selection
*
* @return the unwrapped version of the selection
*/
public static ISelection resolveSelection(final ISelection selection) {
Assert.isNotNull(selection);
ISelection result;
if (selection instanceof IStructuredSelection) {
final IStructuredSelection strSelection = (IStructuredSelection) selection;
final List<Object> resolvedElements = new ArrayList<Object>();
final Iterator<?> iterator = strSelection.iterator();
while (iterator.hasNext()) {
final Object element = iterator.next();
resolvedElements.add(resolve(element));
}
result = new StructuredSelection(resolvedElements);
} else {
throw new IllegalArgumentException("Unhandled selection type: " + selection.getClass().getName()); //$NON-NLS-1$
}
return result;
}
/**
* Resolve the given UI element into the underlying model element.
*
* @param element
* a UI element, that may be a proxy for a model element
* @return the corresponding model element, or the given element if it is not a proxy
*/
public static Object resolve(final Object element) {
Object resolved = element;
if (element instanceof EObjectTreeElement) {
resolved = ((EObjectTreeElement) element).getEObject();
} else if (element instanceof EAttributeTreeElement) {
resolved = ((EAttributeTreeElement) element).getEAttribute();
} else if (element instanceof EReferenceTreeElement) {
resolved = ((EReferenceTreeElement) element).getEReference();
}
return resolved;
}
}
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