/*
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* JtsBinaryParser.java
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*
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* Binary Parser for JTS - relies on org.postgis V1.0.0+ package.
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*
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* (C) 2005 Markus Schaber, markus.schaber@logix-tt.com
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*
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* This library is free software; you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation, either version 2.1 of the License.
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*
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* This library 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 Lesser 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 Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA or visit the web at
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* http://www.gnu.org.
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*
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* $Id$
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*/
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package com.ximple.eofms.util.postjts;
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import org.postgis.binary.ByteGetter;
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import org.postgis.binary.ByteGetter.BinaryByteGetter;
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import org.postgis.binary.ByteGetter.StringByteGetter;
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import org.postgis.binary.ValueGetter;
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import com.vividsolutions.jts.geom.Coordinate;
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import com.vividsolutions.jts.geom.CoordinateSequence;
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import com.vividsolutions.jts.geom.Geometry;
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import com.vividsolutions.jts.geom.GeometryCollection;
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import com.vividsolutions.jts.geom.LineString;
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import com.vividsolutions.jts.geom.LinearRing;
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import com.vividsolutions.jts.geom.MultiLineString;
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import com.vividsolutions.jts.geom.MultiPoint;
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import com.vividsolutions.jts.geom.MultiPolygon;
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import com.vividsolutions.jts.geom.Point;
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import com.vividsolutions.jts.geom.Polygon;
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import com.vividsolutions.jts.geom.impl.PackedCoordinateSequence;
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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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* <p/>
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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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* <p/>
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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, markus.schaber@logix-tt.com
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*/
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public class JtsBinaryParser
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{
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/**
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* Get the appropriate ValueGetter for my endianness
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*
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* @param bytes The appropriate Byte Getter
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* @return the ValueGetter
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*/
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public static ValueGetter valueGetterForEndian(ByteGetter bytes)
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{
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if (bytes.get(0) == ValueGetter.XDR.NUMBER)
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{ // XDR
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return new ValueGetter.XDR(bytes);
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} else if (bytes.get(0) == ValueGetter.NDR.NUMBER)
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{
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return new ValueGetter.NDR(bytes);
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} else
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{
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throw new IllegalArgumentException("Unknown Endian type:" + bytes.get(0));
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}
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}
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/**
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* Parse a hex encoded geometry
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*/
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public Geometry parse(String value)
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{
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StringByteGetter bytes = new ByteGetter.StringByteGetter(value);
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return parseGeometry(valueGetterForEndian(bytes));
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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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public Geometry parse(byte[] value)
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{
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BinaryByteGetter bytes = new ByteGetter.BinaryByteGetter(value);
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return parseGeometry(valueGetterForEndian(bytes));
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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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protected Geometry parseGeometry(ValueGetter data)
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{
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return parseGeometry(data, 0, false);
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}
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/**
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* Parse with a known geometry factory
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*/
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protected Geometry parseGeometry(ValueGetter data, int srid, boolean inheritSrid)
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{
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byte endian = data.getByte(); // skip and test endian flag
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if (endian != data.endian)
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{
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throw new IllegalArgumentException("Endian inconsistency!");
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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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boolean haveZ = (typeword & 0x80000000) != 0;
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boolean haveM = (typeword & 0x40000000) != 0;
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boolean haveS = (typeword & 0x20000000) != 0;
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if (haveS)
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{
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int newsrid = data.getInt();
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if (inheritSrid && newsrid != srid)
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{
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throw new IllegalArgumentException("Inconsistent srids in complex geometry: " + srid + ", " + newsrid);
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} else
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{
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srid = newsrid;
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}
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} else if (!inheritSrid)
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{
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srid = -1;
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}
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Geometry result;
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switch (realtype)
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{
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case org.postgis.Geometry.POINT:
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result = parsePoint(data, haveZ, haveM);
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break;
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case org.postgis.Geometry.LINESTRING:
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result = parseLineString(data, haveZ, haveM);
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break;
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case org.postgis.Geometry.POLYGON:
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result = parsePolygon(data, haveZ, haveM, srid);
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break;
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case org.postgis.Geometry.MULTIPOINT:
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result = parseMultiPoint(data, srid);
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break;
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case org.postgis.Geometry.MULTILINESTRING:
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result = parseMultiLineString(data, srid);
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break;
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case org.postgis.Geometry.MULTIPOLYGON:
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result = parseMultiPolygon(data, srid);
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break;
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case org.postgis.Geometry.GEOMETRYCOLLECTION:
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result = parseCollection(data, srid);
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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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result.setSRID(srid);
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return result;
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}
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private Point parsePoint(ValueGetter data, boolean haveZ, boolean haveM)
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{
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double X = data.getDouble();
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double Y = data.getDouble();
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Point result;
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if (haveZ)
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{
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double Z = data.getDouble();
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result = JtsGeometry.geofac.createPoint(new Coordinate(X, Y, Z));
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} else
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{
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result = JtsGeometry.geofac.createPoint(new Coordinate(X, Y));
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}
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if (haveM)
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{ // skip M value
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data.getDouble();
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}
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return result;
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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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private void parseGeometryArray(ValueGetter data, Geometry[] container, int srid)
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{
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for (int i = 0; i < container.length; i++)
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{
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container[i] = parseGeometry(data, srid, true);
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}
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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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*/
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private CoordinateSequence parseCS(ValueGetter data, boolean haveZ, boolean haveM)
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{
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int count = data.getInt();
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int dims = haveZ ? 3 : 2;
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CoordinateSequence cs = new PackedCoordinateSequence.Double(count, dims);
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for (int i = 0; i < count; i++)
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{
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for (int d = 0; d < dims; d++)
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{
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cs.setOrdinate(i, d, data.getDouble());
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}
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if (haveM)
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{ // skip M value
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data.getDouble();
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}
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}
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return cs;
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}
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private MultiPoint parseMultiPoint(ValueGetter data, int srid)
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{
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Point[] points = new Point[data.getInt()];
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parseGeometryArray(data, points, srid);
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return JtsGeometry.geofac.createMultiPoint(points);
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}
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private LineString parseLineString(ValueGetter data, boolean haveZ, boolean haveM)
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{
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return JtsGeometry.geofac.createLineString(parseCS(data, haveZ, haveM));
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}
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private LinearRing parseLinearRing(ValueGetter data, boolean haveZ, boolean haveM)
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{
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return JtsGeometry.geofac.createLinearRing(parseCS(data, haveZ, haveM));
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}
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private Polygon parsePolygon(ValueGetter data, boolean haveZ, boolean haveM, int srid)
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{
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int holecount = data.getInt() - 1;
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LinearRing[] rings = new LinearRing[holecount];
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LinearRing shell = parseLinearRing(data, haveZ, haveM);
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shell.setSRID(srid);
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for (int i = 0; i < holecount; i++)
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{
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rings[i] = parseLinearRing(data, haveZ, haveM);
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rings[i].setSRID(srid);
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}
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return JtsGeometry.geofac.createPolygon(shell, rings);
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}
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private MultiLineString parseMultiLineString(ValueGetter data, int srid)
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{
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int count = data.getInt();
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LineString[] strings = new LineString[count];
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parseGeometryArray(data, strings, srid);
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return JtsGeometry.geofac.createMultiLineString(strings);
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}
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private MultiPolygon parseMultiPolygon(ValueGetter data, int srid)
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{
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int count = data.getInt();
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Polygon[] polys = new Polygon[count];
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parseGeometryArray(data, polys, srid);
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return JtsGeometry.geofac.createMultiPolygon(polys);
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}
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private GeometryCollection parseCollection(ValueGetter data, int srid)
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{
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int count = data.getInt();
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Geometry[] geoms = new Geometry[count];
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parseGeometryArray(data, geoms, srid);
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return JtsGeometry.geofac.createGeometryCollection(geoms);
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}
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}
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