/*******************************************************************************
* Copyright (c) 2000, 2006 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.erlide.ui.util;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
/**
* Viewer filter used in selection dialogs.
*/
public class TypedViewerFilter extends ViewerFilter {
private final Class<?>[] fAcceptedTypes;
private final Object[] fRejectedElements;
/**
* Creates a filter that only allows elements of gives types.
*
* @param acceptedTypes
* The types of accepted elements
*/
public TypedViewerFilter(final Class<?>[] acceptedTypes) {
this(acceptedTypes, null);
}
/**
* Creates a filter that only allows elements of gives types, but not from a list of
* rejected elements.
*
* @param acceptedTypes
* Accepted elements must be of this types
* @param rejectedElements
* Element equals to the rejected elements are filtered out
*/
public TypedViewerFilter(final Class<?>[] acceptedTypes,
final Object[] rejectedElements) {
fAcceptedTypes = acceptedTypes;
fRejectedElements = rejectedElements;
}
/**
* @see ViewerFilter#select(org.eclipse.jface.viewers.Viewer, java.lang.Object,
* java.lang.Object)
*/
@Override
public boolean select(final Viewer viewer, final Object parentElement,
final Object element) {
if (fRejectedElements != null) {
for (int i = 0; i < fRejectedElements.length; i++) {
if (element.equals(fRejectedElements[i])) {
return false;
}
}
}
for (int i = 0; i < fAcceptedTypes.length; i++) {
if (fAcceptedTypes[i].isInstance(element)) {
return true;
}
}
return false;
}
}