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/*******************************************************************************
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* Copyright (c) 2006, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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******************************************************************************/
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package org.eclipse.ui.internal.navigator.filters;
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import org.eclipse.core.expressions.EvaluationResult;
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import org.eclipse.core.expressions.Expression;
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import org.eclipse.core.expressions.IEvaluationContext;
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import org.eclipse.jface.viewers.Viewer;
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import org.eclipse.jface.viewers.ViewerFilter;
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import org.eclipse.ui.internal.navigator.NavigatorPlugin;
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/**
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* @since 3.2
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*
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*/
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public class CoreExpressionFilter extends ViewerFilter {
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private Expression filterExpression;
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/**
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* Creates a filter which hides all elements that match the given
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* expression.
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*
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* @param aFilterExpression
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* An expression to hide elements in the viewer.
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*/
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public CoreExpressionFilter(Expression aFilterExpression) {
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filterExpression = aFilterExpression;
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}
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/*
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* (non-Javadoc)
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*
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* @see org.eclipse.jface.viewers.ViewerFilter#select(org.eclipse.jface.viewers.Viewer,
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* java.lang.Object, java.lang.Object)
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*/
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public boolean select(Viewer viewer, Object parentElement, Object element) {
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IEvaluationContext context = NavigatorPlugin.getEvalContext(element);
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return NavigatorPlugin.safeEvaluate(filterExpression, context) != EvaluationResult.TRUE;
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}
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}
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