/**
* Copyright (c) 2010-2013 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.gis.spatial.pipes.processing;
import org.neo4j.gis.spatial.pipes.AbstractGroupGeoPipe;
import org.neo4j.gis.spatial.pipes.GeoPipeFlow;
/**
* Unites geometries of every item contained in the pipeline.
* This pipe groups every item in the pipeline in a single item containing the geometry output
* of the union.
*/
public class UnionAll extends AbstractGroupGeoPipe {
@Override
protected void group(GeoPipeFlow flow) {
if (groups.size() == 0) {
groups.add(flow);
} else {
GeoPipeFlow result = groups.get(0);
result.setGeometry(result.getGeometry().union(flow.getGeometry()));
result.merge(flow);
}
}
}