use LoadingCache instead of Cache

[EMFCompare2.git] / plugins / org.eclipse.emf.compare.rcp.ui / src / org / eclipse / emf / compare / rcp / ui / structuremergeviewer / filters / RemovedElementsFilter.java

/*******************************************************************************
 * Copyright (c) 2013 Obeo.
 * 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:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.eclipse.emf.compare.rcp.ui.structuremergeviewer.filters;

import static org.eclipse.emf.compare.utils.EMFComparePredicates.ofKind;

import com.google.common.base.Predicate;

import org.eclipse.emf.compare.Comparison;
import org.eclipse.emf.compare.Diff;
import org.eclipse.emf.compare.DifferenceKind;
import org.eclipse.emf.compare.scope.IComparisonScope;
import org.eclipse.emf.ecore.EObject;

/**
 * A filter used by default that filtered out removed elements.
 * 
 * @author <a href="mailto:axel.richard@obeo.fr">Axel Richard</a>
 * @since 3.0
 */
public class RemovedElementsFilter implements IDifferenceFilter {

        /** A human-readable label for this filter. This will be displayed in the EMF Compare UI. */
        private String label;

        /** The initial activation state of the filter. */
        private boolean activeByDefault;

        /** The Predicate activate through this action. */
        private Predicate<? super EObject> predicate;

        /**
         * Constructs the filter with the appropriate predicate.
         */
        public RemovedElementsFilter() {
                super();
                setPredicate();
        }

        /**
         * {@inheritDoc}
         * 
         * @see org.eclipse.emf.compare.rcp.ui.structuremergeviewer.filters.IDifferenceFilter#getLabel()
         */
        public String getLabel() {
                return label;
        }

        /**
         * {@inheritDoc}
         * 
         * @see org.eclipse.emf.compare.rcp.ui.structuremergeviewer.filters.IDifferenceFilter#setLabel(java.lang.String)
         */
        public void setLabel(String label) {
                this.label = label;
        }

        /**
         * {@inheritDoc}
         * 
         * @see org.eclipse.emf.compare.rcp.ui.structuremergeviewer.filters.IDifferenceFilter#defaultSelected()
         */
        public boolean defaultSelected() {
                return activeByDefault;
        }

        /**
         * {@inheritDoc}
         * 
         * @see org.eclipse.emf.compare.rcp.ui.structuremergeviewer.filters.IDifferenceFilter#setDefaultSelected(boolean)
         */
        public void setDefaultSelected(boolean activeByDefault) {
                this.activeByDefault = activeByDefault;
        }

        /**
         * {@inheritDoc}
         * 
         * @see org.eclipse.emf.compare.rcp.ui.structuremergeviewer.filters.IDifferenceFilter#isEnabled(org.eclipse.emf.compare.scope.IComparisonScope,
         *      org.eclipse.emf.compare.Comparison)
         */
        public boolean isEnabled(IComparisonScope scope, Comparison comparison) {
                return true;
        }

        /**
         * {@inheritDoc}
         * 
         * @see org.eclipse.emf.compare.rcp.ui.structuremergeviewer.filters.IDifferenceFilter#getPredicate()
         */
        public Predicate<? super EObject> getPredicate() {
                return predicate;
        }

        /**
         * Set the predicate that will be activate through this filter.
         */
        private void setPredicate() {
                final Predicate<? super EObject> actualPredicate = new Predicate<EObject>() {
                        public boolean apply(EObject input) {
                                return input instanceof Diff && ofKind(DifferenceKind.DELETE).apply((Diff)input);
                        }
                };
                predicate = actualPredicate;
        }

}