svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.geometry / org.gvsig.fmap.geometry.jts / src / main / java / org / gvsig / fmap / geom / jts / operation / fromwkb / PostGISEWKBParser.java @ 43020
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2013 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 3 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us at info AT
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* gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.fmap.geom.jts.operation.fromwkb; |
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/*
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* Based in
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* PostGIS extension for PostgreSQL JDBC driver - Binary Parser
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*
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* (C) 2005 Markus Schaber, schabios@logi-track.com
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*/
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import java.nio.ByteBuffer; |
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import java.nio.ByteOrder; |
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import org.gvsig.fmap.geom.Geometry; |
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import org.gvsig.fmap.geom.GeometryLocator; |
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import org.gvsig.fmap.geom.GeometryManager; |
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import org.gvsig.fmap.geom.Geometry.SUBTYPES; |
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import org.gvsig.fmap.geom.Geometry.TYPES; |
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import org.gvsig.fmap.geom.aggregate.MultiPoint; |
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import org.gvsig.fmap.geom.aggregate.MultiPrimitive; |
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import org.gvsig.fmap.geom.exception.CreateGeometryException; |
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import org.gvsig.fmap.geom.primitive.OrientablePrimitive; |
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import org.gvsig.fmap.geom.primitive.Point; |
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import org.gvsig.fmap.geom.primitive.Primitive; |
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import org.gvsig.fmap.geom.primitive.Ring; |
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import org.gvsig.fmap.geom.type.GeometryType; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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import com.vividsolutions.jts.io.WKBConstants; |
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import org.gvsig.fmap.geom.primitive.Line; |
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import org.gvsig.fmap.geom.primitive.Polygon; |
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/**
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* Parse binary representation of geometries. Currently, only text rep (hexed)
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* implementation is tested.
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*
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* It should be easy to add char[] and CharSequence ByteGetter instances,
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* although the latter one is not compatible with older jdks.
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*
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* I did not implement real unsigned 32-bit integers or emulate them with long,
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* as both java Arrays and Strings currently can have only 2^31-1 elements
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* (bytes), so we cannot even get or build Geometries with more than approx.
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* 2^28 coordinates (8 bytes each).
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*
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* @author markus.schaber@logi-track.com
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*
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* https://github.com/postgis/postgis-java/blob/master/jdbc/src/main/java/org/postgis/binary/BinaryWriter.java
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*
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*/
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public class PostGISEWKBParser { |
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private boolean gHaveM, gHaveZ, gHaveS; // M, Z y SRID |
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private static final Logger LOG = LoggerFactory.getLogger(PostGISEWKBParser.class); |
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private final GeometryManager geomManager = GeometryLocator.getGeometryManager(); |
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private final GeometryType[] pointGeometryTypes; |
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public PostGISEWKBParser() {
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pointGeometryTypes |
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= new GeometryType[]{ |
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loadPointGeometryType(Geometry.SUBTYPES.GEOM2D, "2D"),
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loadPointGeometryType(Geometry.SUBTYPES.GEOM3D, "3D"),
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loadPointGeometryType(Geometry.SUBTYPES.GEOM2DM, "2DM"),
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loadPointGeometryType(Geometry.SUBTYPES.GEOM3DM, "3DM")};
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} |
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@SuppressWarnings("UseSpecificCatch") |
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private GeometryType loadPointGeometryType(int subtype, String subTypeName) { |
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try {
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return geomManager.getGeometryType(Geometry.TYPES.POINT, subtype);
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} catch (Exception e) { |
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LOG.info("Unable to get a reference to the geometry "
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+ "type Point{}, to be cached", subTypeName);
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return null; |
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} |
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} |
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/**
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* Parse a binary encoded geometry.
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*
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* Is synchronized to protect offset counter. (Unfortunately, Java does not
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* have neither call by reference nor multiple return values.)
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*
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* @param value
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* @return
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* @throws CreateGeometryException
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*/
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public synchronized Geometry parse(byte[] value) throws CreateGeometryException { |
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// BinaryByteGetter bytes = new ByteGetter.BinaryByteGetter(value);
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ByteBuffer buf = ByteBuffer.wrap(value); |
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return parseGeometry(buf);
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} |
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/**
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* Parse a geometry starting at offset.
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*
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* @param data
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* @return
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* @throws CreateGeometryException
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*/
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protected Geometry parseGeometry(ByteBuffer data) throws CreateGeometryException { |
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int realtype = parseTypeAndSRID(data);
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Geometry result1 = null;
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switch (realtype) {
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case WKBConstants.wkbPoint:
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result1 = parsePoint(data, gHaveZ, gHaveM); |
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break;
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case WKBConstants.wkbLineString:
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result1 = parseLineString(data, gHaveZ, gHaveM); |
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break;
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case WKBConstants.wkbPolygon:
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result1 = parsePolygon(data, gHaveZ, gHaveM); |
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break;
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case WKBConstants.wkbMultiPoint:
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result1 = parseMultiPoint(data, gHaveZ, gHaveM); |
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break;
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case WKBConstants.wkbMultiLineString:
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result1 = parseMultiLineString(data, gHaveZ, gHaveM); |
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return result1;
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case WKBConstants.wkbMultiPolygon:
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result1 = parseMultiPolygon(data, gHaveZ, gHaveM); |
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break;
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case WKBConstants.wkbGeometryCollection:
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result1 = parseCollection(data); |
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break;
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default:
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//throw new IllegalArgumentException("Unknown Geometry Type!");
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} |
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return result1;
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} |
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protected int parseTypeAndSRID(ByteBuffer data) { |
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byte endian = data.get(); // skip and test endian flag |
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if (endian == 1) { |
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data.order(ByteOrder.LITTLE_ENDIAN);
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} |
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int typeword = data.getInt();
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int realtype = typeword & 0x1FFFFFFF; // cut off high flag bits |
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gHaveZ = (typeword & 0x80000000) != 0; |
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gHaveM = (typeword & 0x40000000) != 0; |
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gHaveS = (typeword & 0x20000000) != 0; |
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// not used
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int srid = -1; |
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if (gHaveS) {
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srid = data.getInt(); |
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} |
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// Intento de dar soporte a WKB junto a EWKB
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// https://en.wikipedia.org/wiki/Well-known_text#Well-known_binary
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if( realtype >= 3000 ) { |
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gHaveM = true;
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gHaveZ = true;
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gHaveS = false;
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realtype -= 3000;
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} else if( realtype >= 2000 ) { |
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gHaveM = true;
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gHaveZ = false;
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gHaveS = false;
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realtype -= 2000;
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} else if( realtype >= 1000 ) { |
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gHaveM = false;
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gHaveZ = true;
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gHaveS = false;
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realtype -= 1000;
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} |
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return realtype;
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} |
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private Point parsePoint(ByteBuffer data, boolean haveZ, boolean haveM) |
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throws CreateGeometryException {
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double x = data.getDouble();
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double y = data.getDouble();
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Point point;
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int subtype = getSubType(haveZ, haveM);
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// If we have a cached GeometryType use it, otherwise call the manager
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if (pointGeometryTypes[subtype] == null) { |
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point = (Point) geomManager.create(Geometry.TYPES.POINT, subtype);
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} else {
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point = (Point) pointGeometryTypes[subtype].create();
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} |
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point.setX(x); |
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point.setY(y); |
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// Other dimensions
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if (haveZ) {
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point.setCoordinateAt(Geometry.DIMENSIONS.Z, data.getDouble()); |
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} |
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if (haveM) {
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point.setCoordinateAt(point.getDimension()-1, data.getDouble());
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} |
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return point;
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} |
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/**
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* @param haveZ
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* @param haveM
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* @return
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*/
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private int getSubType(boolean haveZ, boolean haveM) { |
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int subtype;
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if( haveZ ) {
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if( haveM ) {
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subtype = Geometry.SUBTYPES.GEOM3DM; |
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} else {
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subtype = Geometry.SUBTYPES.GEOM3D; |
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} |
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} else {
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if( haveM ) {
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subtype = Geometry.SUBTYPES.GEOM2DM; |
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} else {
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subtype = Geometry.SUBTYPES.GEOM2D; |
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} |
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} |
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return subtype;
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} |
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private MultiPrimitive parseMultiLineString(ByteBuffer data, boolean haveZ, boolean haveM) throws CreateGeometryException { |
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int subType = getSubType(haveZ, haveM);
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MultiPrimitive multiline = geomManager.createMultiLine(subType); |
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int count = data.getInt();
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for (int i = 0; i < count; i++) { |
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parseTypeAndSRID(data); |
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Point[] points = parsePointArray(data, haveZ, haveM); |
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Line line = geomManager.createLine(getSubType(haveZ, haveM));
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line.ensureCapacity(points.length); |
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for (Point point : points) { |
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line.addVertex(point); |
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} |
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multiline.addPrimitive(line); |
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} |
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return multiline;
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} |
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private MultiPrimitive parseMultiPolygon(ByteBuffer data, boolean haveZ, boolean haveM) |
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throws CreateGeometryException {
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int count = data.getInt();
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int subType = getSubType(haveZ, haveM);
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MultiPrimitive multipolygon = geomManager.createMultiPolygon(subType); |
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for (int i = 0; i < count; i++) { |
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parseTypeAndSRID(data); |
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Polygon polygon = geomManager.createPolygon(subType);
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int countRings = data.getInt();
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for (int nring = 0; nring < countRings; nring++) { |
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OrientablePrimitive ring; |
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if( nring==0 ) { |
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ring = polygon; |
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} else {
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ring = (Ring) geomManager.create(Geometry.TYPES.RING,subType); |
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} |
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Point[] points = parsePointsAsPointsArray(data, haveZ, haveM); |
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ring.ensureCapacity(points.length); |
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int lastPoint = points.length - 1; |
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for (int k = 0; k <= lastPoint; k++) { |
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ring.addVertex(points[k]); |
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} |
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if( nring!=0 ) { |
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polygon.addInteriorRing((Ring)ring); |
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} |
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} |
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multipolygon.addPrimitive(polygon); |
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} |
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return multipolygon;
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} |
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private Point[] parsePointsAsPointsArray(ByteBuffer data, boolean haveZ, |
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boolean haveM) throws CreateGeometryException { |
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int count = data.getInt();
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Point points[] = new Point[count]; |
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int subtype = getSubType(haveZ, haveM);
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for (int i = 0; i < count; i++) { |
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points[i] = geomManager.createPoint(data.getDouble(), data.getDouble(), subtype); |
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switch (subtype) {
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case Geometry.SUBTYPES.GEOM3D:
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points[i].setCoordinateAt(Geometry.DIMENSIONS.Z, data.getDouble()); // z
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break;
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case Geometry.SUBTYPES.GEOM2DM:
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points[i].setCoordinateAt(points[i].getDimension()-1, data.getDouble()); // m |
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break;
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case Geometry.SUBTYPES.GEOM3DM:
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points[i].setCoordinateAt(Geometry.DIMENSIONS.Z, data.getDouble()); // z
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points[i].setCoordinateAt(points[i].getDimension()-1, data.getDouble()); // m |
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break;
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default:
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break;
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} |
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} |
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return points;
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} |
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private MultiPrimitive parseCollection(ByteBuffer data) throws CreateGeometryException { |
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int count = data.getInt();
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Geometry[] geoms = new Geometry[count]; |
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parseGeometryArray(data, geoms); |
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MultiPrimitive multiPrimitive = (MultiPrimitive) geomManager.create(TYPES.AGGREGATE, SUBTYPES.GEOM2D); |
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for (Geometry geom : geoms) {
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multiPrimitive.addPrimitive((Primitive) geom); |
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} |
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return multiPrimitive;
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} |
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/**
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* Parse an Array of "full" Geometries
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*
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* @throws CreateGeometryException
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*/
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private void parseGeometryArray(ByteBuffer data, Geometry[] container) throws CreateGeometryException { |
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for (int i = 0; i < container.length; i++) { |
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container[i] = parseGeometry(data); |
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} |
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} |
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private Line parseLineString(ByteBuffer data, boolean haveZ, boolean haveM) throws CreateGeometryException { |
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Point[] points = parsePointArray(data, haveZ, haveM); |
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Line line = geomManager.createLine(getSubType(haveZ, haveM));
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line.ensureCapacity(points.length); |
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for (Point point : points) { |
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line.addVertex(point); |
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} |
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return line;
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} |
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/**
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* Parse an Array of "slim" Points (without endianness and type, part of
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* LinearRing and Linestring, but not MultiPoint!
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*
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* @param haveZ
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* @param haveM
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* @throws CreateGeometryException
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*/
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private Point[] parsePointArray(ByteBuffer data, boolean haveZ, boolean haveM) |
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throws CreateGeometryException {
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int count = data.getInt();
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Point[] result = new Point[count]; |
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for (int i = 0; i < count; i++) { |
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result[i] = parsePoint(data, haveZ, haveM); |
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} |
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return result;
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} |
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private Polygon parsePolygon(ByteBuffer data, boolean haveZ, boolean haveM) throws CreateGeometryException { |
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int count = data.getInt();
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int subType = getSubType(haveZ, haveM);
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Polygon polygon = geomManager.createPolygon(subType);
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fillLinearRing(data, polygon, haveZ, haveM); |
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for (int i = 1; i < count; i++) { |
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Ring ring = (Ring) geomManager.create(Geometry.TYPES.RING, subType); |
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fillLinearRing(data, ring, haveZ, haveM); |
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polygon.addInteriorRing(ring); |
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} |
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return polygon;
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} |
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private void fillLinearRing(ByteBuffer data, OrientablePrimitive ring, boolean haveZ, boolean haveM) |
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throws CreateGeometryException {
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Point[] points = parsePointArray(data, haveZ, haveM); |
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int lastPoint = points.length - 1; |
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ring.ensureCapacity(points.length); |
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for (int i = 0; i <= lastPoint; i++) { |
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ring.addVertex(points[i]); |
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} |
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} |
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private MultiPoint parseMultiPoint(ByteBuffer data, boolean haveZ, boolean haveM) throws CreateGeometryException { |
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int subType = getSubType(haveZ, haveM);
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MultiPoint multipoint = geomManager.createMultiPoint(subType); |
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int points = data.getInt();
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multipoint.ensureCapacity(points); |
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for (int i = 0; i < points; i++) { |
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parseTypeAndSRID(data); |
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multipoint.addPoint(parsePoint(data, haveZ, haveM)); |
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} |
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return multipoint;
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} |
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} |