svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.plugin / org.gvsig.sqlite / org.gvsig.sqlite.provider / src / main / java / org / gvsig / sqlite / dal / functions / ST_ConvexHull.java @ 47583
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/*
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2020 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.sqlite.dal.functions; |
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import java.sql.SQLException; |
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import org.gvsig.fmap.geom.Geometry; |
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import org.gvsig.sqlite.dal.geopackage.GeopackageGeometryBuilder; |
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import org.gvsig.sqlite.dal.geopackage.GeopackageGeometryParser; |
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import org.gvsig.sqlite.dal.geopackage.GeopackageUtils; |
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import org.sqlite.SQLiteConnection; |
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/**
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*
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* @author gvSIG Team
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*/
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@SuppressWarnings("UseSpecificCatch") |
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public class ST_ConvexHull extends Functions.AbstractFunction { |
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public ST_ConvexHull(SQLiteConnection conn) {
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super("ST_ConvexHull", conn); |
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} |
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@Override
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protected void xFunc() throws SQLException { |
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try {
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byte[] bytes = value_blob(0); |
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if (bytes == null) { |
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this.result();
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return;
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} |
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SQLiteConnection conn = this.getConnection();
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GeopackageGeometryParser parser = GeopackageUtils.createGeometryParser(); |
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Geometry geom = parser.parseToGeometry(conn,bytes); |
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if (geom == null) { |
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this.result();
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return;
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} |
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GeopackageGeometryBuilder builder = GeopackageUtils.createGeometryBuilder(); |
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builder.setGeometry(conn, geom.convexHull()); |
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bytes = builder.build(); |
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if (bytes == null) { |
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this.result();
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} else {
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this.result(bytes);
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} |
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} catch (Throwable ex) { |
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throw new SQLException("Can't get geometry's convex hull", ex); |
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} |
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} |
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} |