eu.esdihumboldt.hale.ui.views.mapping.CellComparator.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.views.mapping.CellComparator.java

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/*
 * Copyright (c) 2013 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.views.mapping;

import java.util.Comparator;

import com.google.common.collect.Multimap;

import eu.esdihumboldt.hale.common.align.helper.EntityDefinitionComparator;
import eu.esdihumboldt.hale.common.align.model.Cell;
import eu.esdihumboldt.hale.common.align.model.EntityDefinition;

/**
 * Comparator for cells.
 */
final class CellComparator implements Comparator<Cell> {

    private final Comparator<EntityDefinition> edComp = new EntityDefinitionComparator();

    @Override
    public int compare(Cell o1, Cell o2) {
        if (emptyOrNull(o1.getSource()) && emptyOrNull(o2.getSource())) {
            // compare first target
            EntityDefinition e1 = o1.getTarget().values().iterator().next().getDefinition();
            EntityDefinition e2 = o2.getTarget().values().iterator().next().getDefinition();
            return edComp.compare(e1, e2);
        } else if (emptyOrNull(o1.getSource())) {
            // o1 after o2
            return 1;
        } else if (emptyOrNull(o2.getSource())) {
            // o2 after o1
            return -1;
        }

        // compare first entity in source
        // XXX what about multiple sources?
        EntityDefinition e1 = o1.getSource().values().iterator().next().getDefinition();
        EntityDefinition e2 = o2.getSource().values().iterator().next().getDefinition();
        return edComp.compare(e1, e2);
    }

    private boolean emptyOrNull(Multimap<?, ?> source) {
        return source == null || source.isEmpty();
    }
}