/*******************************************************************************
* Copyright (c) 2006, 2015 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.eclipse.ui.internal.navigator.filters;
import org.eclipse.core.expressions.EvaluationResult;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.ui.internal.navigator.NavigatorPlugin;
/**
* @since 3.2
*
*/
public class CoreExpressionFilter extends ViewerFilter {
private Expression filterExpression;
/**
* Creates a filter which hides all elements that match the given
* expression.
*
* @param aFilterExpression
* An expression to hide elements in the viewer.
*/
public CoreExpressionFilter(Expression aFilterExpression) {
filterExpression = aFilterExpression;
}
@Override
public boolean select(Viewer viewer, Object parentElement, Object element) {
IEvaluationContext context = NavigatorPlugin.getEvalContext(element);
return NavigatorPlugin.safeEvaluate(filterExpression, context) != EvaluationResult.TRUE;
}
}