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DBCCHDS
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/*******************************************************************************
* Copyright (c) 2000, 2008 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 com.gg.eclipse.closure.ui.properties;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
/**
* Viewer filter used in selection dialogs.
*/
public class TypedViewerFilter extends ViewerFilter {
private Class[] fAcceptedTypes;
private Object[] fRejectedElements;
/**
* Creates a filter that only allows elements of gives types.
* @param acceptedTypes The types of accepted elements
*/
public TypedViewerFilter(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(Class[] acceptedTypes, Object[] rejectedElements) {
Assert.isNotNull(acceptedTypes);
fAcceptedTypes= acceptedTypes;
fRejectedElements= rejectedElements;
}
/**
* @see ViewerFilter#select(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
*/
public boolean select(Viewer viewer, Object parentElement, 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;
}
}