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org.h2.util.geometry.JTSUtils Maven / Gradle / Ivy
/*
* Copyright 2004-2021 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.util.geometry;
import static org.h2.util.geometry.GeometryUtils.DIMENSION_SYSTEM_XY;
import static org.h2.util.geometry.GeometryUtils.DIMENSION_SYSTEM_XYM;
import static org.h2.util.geometry.GeometryUtils.DIMENSION_SYSTEM_XYZ;
import static org.h2.util.geometry.GeometryUtils.DIMENSION_SYSTEM_XYZM;
import static org.h2.util.geometry.GeometryUtils.GEOMETRY_COLLECTION;
import static org.h2.util.geometry.GeometryUtils.LINE_STRING;
import static org.h2.util.geometry.GeometryUtils.M;
import static org.h2.util.geometry.GeometryUtils.MULTI_LINE_STRING;
import static org.h2.util.geometry.GeometryUtils.MULTI_POINT;
import static org.h2.util.geometry.GeometryUtils.MULTI_POLYGON;
import static org.h2.util.geometry.GeometryUtils.POINT;
import static org.h2.util.geometry.GeometryUtils.POLYGON;
import static org.h2.util.geometry.GeometryUtils.X;
import static org.h2.util.geometry.GeometryUtils.Y;
import static org.h2.util.geometry.GeometryUtils.Z;
import static org.h2.util.geometry.GeometryUtils.checkFinite;
import static org.h2.util.geometry.GeometryUtils.toCanonicalDouble;
import java.io.ByteArrayOutputStream;
import org.h2.message.DbException;
import org.h2.util.geometry.EWKBUtils.EWKBTarget;
import org.h2.util.geometry.GeometryUtils.DimensionSystemTarget;
import org.h2.util.geometry.GeometryUtils.Target;
import org.locationtech.jts.geom.CoordinateSequence;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.GeometryCollection;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.LineString;
import org.locationtech.jts.geom.LinearRing;
import org.locationtech.jts.geom.MultiLineString;
import org.locationtech.jts.geom.MultiPoint;
import org.locationtech.jts.geom.MultiPolygon;
import org.locationtech.jts.geom.Point;
import org.locationtech.jts.geom.Polygon;
import org.locationtech.jts.geom.PrecisionModel;
import org.locationtech.jts.geom.impl.CoordinateArraySequenceFactory;
import org.locationtech.jts.geom.impl.PackedCoordinateSequenceFactory;
/**
* Utilities for Geometry data type from JTS library.
*/
public final class JTSUtils {
/**
* Converter output target that creates a JTS Geometry.
*/
public static final class GeometryTarget extends Target {
private final int dimensionSystem;
private GeometryFactory factory;
private int type;
private CoordinateSequence coordinates;
private CoordinateSequence[] innerCoordinates;
private int innerOffset;
private Geometry[] subgeometries;
/**
* Creates a new instance of JTS Geometry target.
*
* @param dimensionSystem
* dimension system to use
*/
public GeometryTarget(int dimensionSystem) {
this.dimensionSystem = dimensionSystem;
}
private GeometryTarget(int dimensionSystem, GeometryFactory factory) {
this.dimensionSystem = dimensionSystem;
this.factory = factory;
}
@Override
protected void init(int srid) {
factory = new GeometryFactory(new PrecisionModel(), srid,
(dimensionSystem & DIMENSION_SYSTEM_XYM) != 0 ? PackedCoordinateSequenceFactory.DOUBLE_FACTORY
: CoordinateArraySequenceFactory.instance());
}
@Override
protected void startPoint() {
type = POINT;
initCoordinates(1);
innerOffset = -1;
}
@Override
protected void startLineString(int numPoints) {
type = LINE_STRING;
initCoordinates(numPoints);
innerOffset = -1;
}
@Override
protected void startPolygon(int numInner, int numPoints) {
type = POLYGON;
initCoordinates(numPoints);
innerCoordinates = new CoordinateSequence[numInner];
innerOffset = -1;
}
@Override
protected void startPolygonInner(int numInner) {
innerCoordinates[++innerOffset] = createCoordinates(numInner);
}
@Override
protected void startCollection(int type, int numItems) {
this.type = type;
switch (type) {
case MULTI_POINT:
subgeometries = new Point[numItems];
break;
case MULTI_LINE_STRING:
subgeometries = new LineString[numItems];
break;
case MULTI_POLYGON:
subgeometries = new Polygon[numItems];
break;
case GEOMETRY_COLLECTION:
subgeometries = new Geometry[numItems];
break;
default:
throw new IllegalArgumentException();
}
}
@Override
protected Target startCollectionItem(int index, int total) {
return new GeometryTarget(dimensionSystem, factory);
}
@Override
protected void endCollectionItem(Target target, int type, int index, int total) {
subgeometries[index] = ((GeometryTarget) target).getGeometry();
}
private void initCoordinates(int numPoints) {
coordinates = createCoordinates(numPoints);
}
private CoordinateSequence createCoordinates(int numPoints) {
int d, m;
switch (dimensionSystem) {
case DIMENSION_SYSTEM_XY:
d = 2;
m = 0;
break;
case DIMENSION_SYSTEM_XYZ:
d = 3;
m = 0;
break;
case DIMENSION_SYSTEM_XYM:
d = 3;
m = 1;
break;
case DIMENSION_SYSTEM_XYZM:
d = 4;
m = 1;
break;
default:
throw DbException.getInternalError();
}
return factory.getCoordinateSequenceFactory().create(numPoints, d, m);
}
@Override
protected void addCoordinate(double x, double y, double z, double m, int index, int total) {
if (type == POINT && Double.isNaN(x) && Double.isNaN(y) && Double.isNaN(z) && Double.isNaN(m)) {
this.coordinates = createCoordinates(0);
return;
}
CoordinateSequence coordinates = innerOffset < 0 ? this.coordinates : innerCoordinates[innerOffset];
coordinates.setOrdinate(index, X, checkFinite(x));
coordinates.setOrdinate(index, Y, checkFinite(y));
switch (dimensionSystem) {
case DIMENSION_SYSTEM_XYZM:
coordinates.setOrdinate(index, M, checkFinite(m));
//$FALL-THROUGH$
case DIMENSION_SYSTEM_XYZ:
coordinates.setOrdinate(index, Z, checkFinite(z));
break;
case DIMENSION_SYSTEM_XYM:
coordinates.setOrdinate(index, 2, checkFinite(m));
}
}
Geometry getGeometry() {
switch (type) {
case POINT:
return new Point(coordinates, factory);
case LINE_STRING:
return new LineString(coordinates, factory);
case POLYGON: {
LinearRing shell = new LinearRing(coordinates, factory);
int innerCount = innerCoordinates.length;
LinearRing[] holes = new LinearRing[innerCount];
for (int i = 0; i < innerCount; i++) {
holes[i] = new LinearRing(innerCoordinates[i], factory);
}
return new Polygon(shell, holes, factory);
}
case MULTI_POINT:
return new MultiPoint((Point[]) subgeometries, factory);
case MULTI_LINE_STRING:
return new MultiLineString((LineString[]) subgeometries, factory);
case MULTI_POLYGON:
return new MultiPolygon((Polygon[]) subgeometries, factory);
case GEOMETRY_COLLECTION:
return new GeometryCollection(subgeometries, factory);
default:
throw new IllegalStateException();
}
}
}
/**
* Converts EWKB to a JTS geometry object.
*
* @param ewkb
* source EWKB
* @return JTS geometry object
*/
public static Geometry ewkb2geometry(byte[] ewkb) {
// Determine dimension system first
DimensionSystemTarget dimensionTarget = new DimensionSystemTarget();
EWKBUtils.parseEWKB(ewkb, dimensionTarget);
// Generate a Geometry
return ewkb2geometry(ewkb, dimensionTarget.getDimensionSystem());
}
/**
* Converts EWKB to a JTS geometry object.
*
* @param ewkb
* source EWKB
* @param dimensionSystem
* dimension system
* @return JTS geometry object
*/
public static Geometry ewkb2geometry(byte[] ewkb, int dimensionSystem) {
GeometryTarget target = new GeometryTarget(dimensionSystem);
EWKBUtils.parseEWKB(ewkb, target);
return target.getGeometry();
}
/**
* Converts Geometry to EWKB.
*
* @param geometry
* source geometry
* @return EWKB representation
*/
public static byte[] geometry2ewkb(Geometry geometry) {
// Determine dimension system first
DimensionSystemTarget dimensionTarget = new DimensionSystemTarget();
parseGeometry(geometry, dimensionTarget);
// Write an EWKB
return geometry2ewkb(geometry, dimensionTarget.getDimensionSystem());
}
/**
* Converts Geometry to EWKB.
*
* @param geometry
* source geometry
* @param dimensionSystem
* dimension system
* @return EWKB representation
*/
public static byte[] geometry2ewkb(Geometry geometry, int dimensionSystem) {
// Write an EWKB
ByteArrayOutputStream output = new ByteArrayOutputStream();
EWKBTarget target = new EWKBTarget(output, dimensionSystem);
parseGeometry(geometry, target);
return output.toByteArray();
}
/**
* Parses a JTS Geometry object.
*
* @param geometry
* geometry to parse
* @param target
* output target
*/
public static void parseGeometry(Geometry geometry, Target target) {
parseGeometry(geometry, target, 0);
}
/**
* Parses a JTS Geometry object.
*
* @param geometry
* geometry to parse
* @param target
* output target
* @param parentType
* type of parent geometry collection, or 0 for the root geometry
*/
private static void parseGeometry(Geometry geometry, Target target, int parentType) {
if (parentType == 0) {
target.init(geometry.getSRID());
}
if (geometry instanceof Point) {
if (parentType != 0 && parentType != MULTI_POINT && parentType != GEOMETRY_COLLECTION) {
throw new IllegalArgumentException();
}
target.startPoint();
Point p = (Point) geometry;
if (p.isEmpty()) {
target.addCoordinate(Double.NaN, Double.NaN, Double.NaN, Double.NaN, 0, 1);
} else {
CoordinateSequence sequence = p.getCoordinateSequence();
addCoordinate(sequence, target, 0, 1);
}
target.endObject(POINT);
} else if (geometry instanceof LineString) {
if (parentType != 0 && parentType != MULTI_LINE_STRING && parentType != GEOMETRY_COLLECTION) {
throw new IllegalArgumentException();
}
LineString ls = (LineString) geometry;
CoordinateSequence cs = ls.getCoordinateSequence();
int numPoints = cs.size();
if (numPoints < 0 || numPoints == 1) {
throw new IllegalArgumentException();
}
target.startLineString(numPoints);
for (int i = 0; i < numPoints; i++) {
addCoordinate(cs, target, i, numPoints);
}
target.endObject(LINE_STRING);
} else if (geometry instanceof Polygon) {
if (parentType != 0 && parentType != MULTI_POLYGON && parentType != GEOMETRY_COLLECTION) {
throw new IllegalArgumentException();
}
Polygon p = (Polygon) geometry;
int numInner = p.getNumInteriorRing();
if (numInner < 0) {
throw new IllegalArgumentException();
}
CoordinateSequence cs = p.getExteriorRing().getCoordinateSequence();
int size = cs.size();
// Size may be 0 (EMPTY) or 4+
if (size < 0 || size >= 1 && size <= 3) {
throw new IllegalArgumentException();
}
if (size == 0 && numInner > 0) {
throw new IllegalArgumentException();
}
target.startPolygon(numInner, size);
if (size > 0) {
addRing(cs, target, size);
for (int i = 0; i < numInner; i++) {
cs = p.getInteriorRingN(i).getCoordinateSequence();
size = cs.size();
// Size may be 0 (EMPTY) or 4+
if (size < 0 || size >= 1 && size <= 3) {
throw new IllegalArgumentException();
}
target.startPolygonInner(size);
addRing(cs, target, size);
}
target.endNonEmptyPolygon();
}
target.endObject(POLYGON);
} else if (geometry instanceof GeometryCollection) {
if (parentType != 0 && parentType != GEOMETRY_COLLECTION) {
throw new IllegalArgumentException();
}
GeometryCollection gc = (GeometryCollection) geometry;
int type;
if (gc instanceof MultiPoint) {
type = MULTI_POINT;
} else if (gc instanceof MultiLineString) {
type = MULTI_LINE_STRING;
} else if (gc instanceof MultiPolygon) {
type = MULTI_POLYGON;
} else {
type = GEOMETRY_COLLECTION;
}
int numItems = gc.getNumGeometries();
if (numItems < 0) {
throw new IllegalArgumentException();
}
target.startCollection(type, numItems);
for (int i = 0; i < numItems; i++) {
Target innerTarget = target.startCollectionItem(i, numItems);
parseGeometry(gc.getGeometryN(i), innerTarget, type);
target.endCollectionItem(innerTarget, type, i, numItems);
}
target.endObject(type);
} else {
throw new IllegalArgumentException();
}
}
private static void addRing(CoordinateSequence sequence, Target target, int size) {
// 0 or 4+ are valid
if (size >= 4) {
double startX = toCanonicalDouble(sequence.getX(0)), startY = toCanonicalDouble(sequence.getY(0));
addCoordinate(sequence, target, 0, size, startX, startY);
for (int i = 1; i < size - 1; i++) {
addCoordinate(sequence, target, i, size);
}
double endX = toCanonicalDouble(sequence.getX(size - 1)), //
endY = toCanonicalDouble(sequence.getY(size - 1));
/*
* TODO OGC 06-103r4 determines points as equal if they have the
* same X and Y coordinates. Should we check Z and M here too?
*/
if (startX != endX || startY != endY) {
throw new IllegalArgumentException();
}
addCoordinate(sequence, target, size - 1, size, endX, endY);
}
}
private static void addCoordinate(CoordinateSequence sequence, Target target, int index, int total) {
addCoordinate(sequence, target, index, total, toCanonicalDouble(sequence.getX(index)),
toCanonicalDouble(sequence.getY(index)));
}
private static void addCoordinate(CoordinateSequence sequence, Target target, int index, int total, double x,
double y) {
double z = toCanonicalDouble(sequence.getZ(index));
double m = toCanonicalDouble(sequence.getM(index));
target.addCoordinate(x, y, z, m, index, total);
}
private JTSUtils() {
}
}
