jsts/org/locationtech/jts/geom/util/GeometryTransformer.js

A JavaScript library of spatial predicates and functions for processing geometry

import LineString from '../LineString.js'
import GeometryFactory from '../GeometryFactory.js'
import LinearRing from '../LinearRing.js'
import MultiPolygon from '../MultiPolygon.js'
import GeometryCollection from '../GeometryCollection.js'
import ArrayList from '../../../../../java/util/ArrayList.js'
import MultiLineString from '../MultiLineString.js'
import IllegalArgumentException from '../../../../../java/lang/IllegalArgumentException.js'
import Point from '../Point.js'
import Polygon from '../Polygon.js'
import MultiPoint from '../MultiPoint.js'
export default class GeometryTransformer {
  constructor() {
    GeometryTransformer.constructor_.apply(this, arguments)
  }
  static constructor_() {
    this._inputGeom = null
    this._factory = null
    this._pruneEmptyGeometry = true
    this._preserveGeometryCollectionType = true
    this._preserveCollections = false
    this._preserveType = false
  }
  transformPoint(geom, parent) {
    return this._factory.createPoint(this.transformCoordinates(geom.getCoordinateSequence(), geom))
  }
  transformPolygon(geom, parent) {
    let isAllValidLinearRings = true
    const shell = this.transformLinearRing(geom.getExteriorRing(), geom)
    if (shell === null || !(shell instanceof LinearRing) || shell.isEmpty()) isAllValidLinearRings = false
    const holes = new ArrayList()
    for (let i = 0; i < geom.getNumInteriorRing(); i++) {
      const hole = this.transformLinearRing(geom.getInteriorRingN(i), geom)
      if (hole === null || hole.isEmpty()) 
        continue
      
      if (!(hole instanceof LinearRing)) isAllValidLinearRings = false
      holes.add(hole)
    }
    if (isAllValidLinearRings) {
      return this._factory.createPolygon(shell, holes.toArray([]))
    } else {
      const components = new ArrayList()
      if (shell !== null) components.add(shell)
      components.addAll(holes)
      return this._factory.buildGeometry(components)
    }
  }
  createCoordinateSequence(coords) {
    return this._factory.getCoordinateSequenceFactory().create(coords)
  }
  getInputGeometry() {
    return this._inputGeom
  }
  transformMultiLineString(geom, parent) {
    const transGeomList = new ArrayList()
    for (let i = 0; i < geom.getNumGeometries(); i++) {
      const transformGeom = this.transformLineString(geom.getGeometryN(i), geom)
      if (transformGeom === null) continue
      if (transformGeom.isEmpty()) continue
      transGeomList.add(transformGeom)
    }
    return this._factory.buildGeometry(transGeomList)
  }
  transformCoordinates(coords, parent) {
    return this.copy(coords)
  }
  transformLineString(geom, parent) {
    return this._factory.createLineString(this.transformCoordinates(geom.getCoordinateSequence(), geom))
  }
  transformMultiPoint(geom, parent) {
    const transGeomList = new ArrayList()
    for (let i = 0; i < geom.getNumGeometries(); i++) {
      const transformGeom = this.transformPoint(geom.getGeometryN(i), geom)
      if (transformGeom === null) continue
      if (transformGeom.isEmpty()) continue
      transGeomList.add(transformGeom)
    }
    return this._factory.buildGeometry(transGeomList)
  }
  transformMultiPolygon(geom, parent) {
    const transGeomList = new ArrayList()
    for (let i = 0; i < geom.getNumGeometries(); i++) {
      const transformGeom = this.transformPolygon(geom.getGeometryN(i), geom)
      if (transformGeom === null) continue
      if (transformGeom.isEmpty()) continue
      transGeomList.add(transformGeom)
    }
    return this._factory.buildGeometry(transGeomList)
  }
  copy(seq) {
    return seq.copy()
  }
  transformLinearRing(geom, parent) {
    const seq = this.transformCoordinates(geom.getCoordinateSequence(), geom)
    if (seq === null) return this._factory.createLinearRing(null)
    const seqSize = seq.size()
    if (seqSize > 0 && seqSize < 4 && !this._preserveType) return this._factory.createLineString(seq)
    return this._factory.createLinearRing(seq)
  }
  transformGeometryCollection(geom, parent) {
    const transGeomList = new ArrayList()
    for (let i = 0; i < geom.getNumGeometries(); i++) {
      const transformGeom = this.transform(geom.getGeometryN(i))
      if (transformGeom === null) continue
      if (this._pruneEmptyGeometry && transformGeom.isEmpty()) continue
      transGeomList.add(transformGeom)
    }
    if (this._preserveGeometryCollectionType) return this._factory.createGeometryCollection(GeometryFactory.toGeometryArray(transGeomList))
    return this._factory.buildGeometry(transGeomList)
  }
  transform(inputGeom) {
    this._inputGeom = inputGeom
    this._factory = inputGeom.getFactory()
    if (inputGeom instanceof Point) return this.transformPoint(inputGeom, null)
    if (inputGeom instanceof MultiPoint) return this.transformMultiPoint(inputGeom, null)
    if (inputGeom instanceof LinearRing) return this.transformLinearRing(inputGeom, null)
    if (inputGeom instanceof LineString) return this.transformLineString(inputGeom, null)
    if (inputGeom instanceof MultiLineString) return this.transformMultiLineString(inputGeom, null)
    if (inputGeom instanceof Polygon) return this.transformPolygon(inputGeom, null)
    if (inputGeom instanceof MultiPolygon) return this.transformMultiPolygon(inputGeom, null)
    if (inputGeom instanceof GeometryCollection) return this.transformGeometryCollection(inputGeom, null)
    throw new IllegalArgumentException('Unknown Geometry subtype: ' + inputGeom.getGeometryType())
  }
}