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/*****************************************************************************
* Copyright (c) 2017 CEA LIST 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:
* CEA LIST - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.emf.expressions.properties.provider;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.papyrus.infra.emf.expressions.ExpressionCatalog;
import org.eclipse.papyrus.infra.emf.expressions.catalog.ExpressionCatalogRegistry;
import org.eclipse.papyrus.infra.widgets.providers.IGraphicalContentProvider;
import org.eclipse.papyrus.infra.widgets.providers.IHierarchicContentProvider;
import org.eclipse.papyrus.infra.widgets.providers.IStaticContentProvider;
import org.eclipse.swt.widgets.Composite;
/**
* This ContentProvider allows to show the expressions owned by a catalog
*
*/
public class ExpressionCatalogContentProvider implements IGraphicalContentProvider, IHierarchicContentProvider, IStaticContentProvider, ITreeContentProvider, IContentProvider {
/** used to return empty value */
private final Object[] emptyArray = new Object[] {};
/**
* the edited feature
*/
private final EReference editedFeature;
/**
*
* Constructor.
*
* @param editedFeature
* the edited feature
*/
public ExpressionCatalogContentProvider(final EReference editedFeature) {
this.editedFeature = editedFeature;
}
/**
* @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
*
* @param inputElement
* @return
*/
@Override
public Object[] getElements(Object inputElement) {
return ExpressionCatalogRegistry.INSTANCE.getAllRegisteredCatalog().toArray();
}
/**
* @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
*
* @param parentElement
* @return
*/
@Override
public Object[] getChildren(Object parentElement) {
if (parentElement instanceof ExpressionCatalog) {
return ((ExpressionCatalog) parentElement).getExpressions().toArray();
}
return this.emptyArray;
}
/**
* @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
*
* @param element
* @return
*/
@Override
public Object getParent(Object element) {
if (element instanceof EObject) {
return ((EObject) element).eContainer();
}
return null;
}
/**
* @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
*
* @param element
* @return
*/
@Override
public boolean hasChildren(Object element) {
if (element instanceof ExpressionCatalog) {
return !((ExpressionCatalog) element).getExpressions().isEmpty();
}
return false;
}
/**
* @see org.eclipse.papyrus.infra.widgets.providers.IStaticContentProvider#getElements()
*
* @return
*/
@Override
public Object[] getElements() {
return this.emptyArray;
}
/**
* @see org.eclipse.papyrus.infra.widgets.providers.IGraphicalContentProvider#createBefore(org.eclipse.swt.widgets.Composite)
*
* @param parent
*/
@Override
public void createBefore(Composite parent) {
// nothing to do
}
/**
* @see org.eclipse.papyrus.infra.widgets.providers.IGraphicalContentProvider#createAfter(org.eclipse.swt.widgets.Composite)
*
* @param parent
*/
@Override
public void createAfter(Composite parent) {
// nothing to do
}
/**
* @see org.eclipse.papyrus.infra.widgets.providers.IHierarchicContentProvider#isValidValue(java.lang.Object)
*
* @param element
* @return
*/
@Override
public boolean isValidValue(Object element) {
if(null==this.editedFeature) {
return true;
}
if (null != element) {
return this.editedFeature.getEType().isInstance(element);
}
return false;
}
}
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