Add geometry parsing for point, line, polygon
This commit is contained in:
Bart van den Eijnden
349
src/ol/format/gmlformat.js
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349
src/ol/format/gmlformat.js
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goog.provide('ol.format.GML');
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goog.require('goog.array');
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goog.require('goog.asserts');
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goog.require('goog.dom');
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goog.require('goog.dom.NodeType');
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goog.require('goog.dom.TagName');
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goog.require('ol.format.XML');
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goog.require('ol.geom.GeometryCollection');
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goog.require('ol.geom.LineString');
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goog.require('ol.geom.Point');
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goog.require('ol.geom.Polygon');
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goog.require('ol.xml');
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/**
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* @constructor
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* @extends {ol.format.XML}
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* @todo stability experimental
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*/
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ol.format.GML = function() {
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goog.base(this);
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};
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goog.inherits(ol.format.GML, ol.format.XML);
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/**
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* @const
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* @private
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* @type {Array.<string>}
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*/
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ol.format.GML.NAMESPACE_URIS_ = [
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'http://www.opengis.net/gml'
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];
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/**
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* @inheritDoc
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*/
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ol.format.GML.prototype.readGeometryFromDocument = function(doc) {
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var node;
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if (doc.nodeType == goog.dom.NodeType.DOCUMENT) {
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// TODO intermediate element node - revisit later
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node = goog.dom.createElement(goog.dom.TagName.PRE);
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node.appendChild(doc.documentElement);
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} else {
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node = doc;
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}
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return this.readGeometryFromNode(node);
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};
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/**
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* @inheritDoc
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*/
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ol.format.GML.prototype.readGeometryFromNode = function(node) {
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var objectStack = [];
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var geometries = ol.xml.pushParseAndPop(
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/** @type {Array.<ol.geom.Geometry>} */ ([]),
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ol.format.GML.GEOMETRY_PARSERS_, node, objectStack);
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if (!goog.isDef(geometries)) {
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return null;
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}
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if (geometries.length === 0) {
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return new ol.geom.GeometryCollection(geometries);
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}
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return geometries[0];
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};
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/**
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* @param {Node} node Node.
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* @param {Array.<*>} objectStack Object stack.
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* @private
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* @return {ol.geom.Point|undefined} Point.
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*/
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ol.format.GML.readPoint_ = function(node, objectStack) {
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goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT);
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goog.asserts.assert(node.localName == 'Point');
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var flatCoordinates =
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ol.format.GML.readFlatCoordinatesFromNode_(node, objectStack);
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if (goog.isDefAndNotNull(flatCoordinates)) {
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var point = new ol.geom.Point(null);
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goog.asserts.assert(flatCoordinates.length == 3);
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point.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
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return point;
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} else {
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return undefined;
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}
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};
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/**
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* @param {Node} node Node.
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* @param {Array.<*>} objectStack Object stack.
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* @private
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* @return {ol.geom.LineString|undefined} LineString.
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*/
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ol.format.GML.readLineString_ = function(node, objectStack) {
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goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT);
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goog.asserts.assert(node.localName == 'LineString');
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var flatCoordinates =
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ol.format.GML.readFlatCoordinatesFromNode_(node, objectStack);
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if (goog.isDefAndNotNull(flatCoordinates)) {
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var lineString = new ol.geom.LineString(null);
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lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
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return lineString;
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} else {
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return undefined;
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}
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};
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/**
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* @param {Node} node Node.
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* @param {Array.<*>} objectStack Object stack.
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* @private
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*/
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ol.format.GML.interiorParser_ = function(node, objectStack) {
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goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT);
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goog.asserts.assert(node.localName == 'interior');
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var flatLinearRing = ol.xml.pushParseAndPop(
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/** @type {Array.<number>|undefined} */ (undefined),
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ol.format.GML.INTERIOR_PARSERS_, node, objectStack);
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if (goog.isDef(flatLinearRing)) {
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var flatLinearRings = /** @type {Array.<Array.<number>>} */
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(objectStack[objectStack.length - 1]);
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goog.asserts.assert(goog.isArray(flatLinearRings));
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goog.asserts.assert(flatLinearRings.length > 0);
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flatLinearRings.push(flatLinearRing);
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}
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};
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/**
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* @param {Node} node Node.
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* @param {Array.<*>} objectStack Object stack.
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* @private
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*/
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ol.format.GML.exteriorParser_ = function(node, objectStack) {
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goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT);
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goog.asserts.assert(node.localName == 'exterior');
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var flatLinearRing = ol.xml.pushParseAndPop(
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/** @type {Array.<number>|undefined} */ (undefined),
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ol.format.GML.EXTERIOR_PARSERS_, node, objectStack);
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if (goog.isDef(flatLinearRing)) {
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var flatLinearRings = /** @type {Array.<Array.<number>>} */
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(objectStack[objectStack.length - 1]);
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goog.asserts.assert(goog.isArray(flatLinearRings));
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goog.asserts.assert(flatLinearRings.length > 0);
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flatLinearRings[0] = flatLinearRing;
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}
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};
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/**
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* @param {Node} node Node.
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* @param {Array.<*>} objectStack Object stack.
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* @private
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* @return {Array.<number>} LinearRing flat coordinates.
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*/
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ol.format.GML.readFlatLinearRing_ = function(node, objectStack) {
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goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT);
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goog.asserts.assert(node.localName == 'LinearRing');
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return /** @type {Array.<number>} */ (ol.xml.pushParseAndPop(
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null, ol.format.GML.FLAT_LINEAR_RING_PARSERS_, node, objectStack));
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};
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/**
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* @param {Node} node Node.
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* @param {Array.<*>} objectStack Object stack.
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* @private
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* @return {ol.geom.Polygon|undefined} Polygon.
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*/
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ol.format.GML.readLinearRing_ = function(node, objectStack) {
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goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT);
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goog.asserts.assert(node.localName == 'LinearRing');
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var flatCoordinates =
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ol.format.GML.readFlatCoordinatesFromNode_(node, objectStack);
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if (goog.isDef(flatCoordinates)) {
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var polygon = new ol.geom.Polygon(null);
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polygon.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates,
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[flatCoordinates.length]);
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return polygon;
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} else {
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return undefined;
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}
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};
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/**
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* @param {Node} node Node.
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* @param {Array.<*>} objectStack Object stack.
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* @private
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* @return {ol.geom.Polygon|undefined} Polygon.
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*/
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ol.format.GML.readPolygon_ = function(node, objectStack) {
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goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT);
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goog.asserts.assert(node.localName == 'Polygon');
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var flatLinearRings = ol.xml.pushParseAndPop(
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/** @type {Array.<Array.<number>>} */ ([null]),
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ol.format.GML.FLAT_LINEAR_RINGS_PARSERS_, node, objectStack);
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if (goog.isDefAndNotNull(flatLinearRings) &&
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!goog.isNull(flatLinearRings[0])) {
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var polygon = new ol.geom.Polygon(null);
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var flatCoordinates = flatLinearRings[0];
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var ends = [flatCoordinates.length];
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var i, ii;
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for (i = 1, ii = flatLinearRings.length; i < ii; ++i) {
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goog.array.extend(flatCoordinates, flatLinearRings[i]);
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ends.push(flatCoordinates.length);
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}
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polygon.setFlatCoordinates(
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ol.geom.GeometryLayout.XYZ, flatCoordinates, ends);
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return polygon;
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} else {
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return undefined;
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}
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};
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/**
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* @param {Node} node Node.
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* @param {Array.<*>} objectStack Object stack.
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* @private
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* @return {Array.<number>} Flat coordinates.
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*/
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ol.format.GML.readFlatCoordinatesFromNode_ = function(node, objectStack) {
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goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT);
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return /** @type {Array.<number>} */ (ol.xml.pushParseAndPop(null,
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ol.format.GML.GEOMETRY_FLAT_COORDINATES_PARSERS_, node, objectStack));
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};
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/**
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* @param {Node} node Node.
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* @private
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* @return {Array.<number>|undefined} Flat coordinates.
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*/
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ol.format.GML.readFlatPos_ = function(node) {
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var s = ol.xml.getAllTextContent(node, false).replace(/^\s*|\s*$/g, '');
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var flatCoordinates = goog.array.map(s.split(/\s+/), parseFloat);
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// TODO handle axis order
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var len = flatCoordinates.length;
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if (len == 2) {
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flatCoordinates.push(0);
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}
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if (len === 0) {
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return undefined;
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}
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return flatCoordinates;
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};
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/**
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* @param {Node} node Node.
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* @private
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* @return {Array.<number>|undefined} Flat coordinates.
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*/
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ol.format.GML.readFlatPosList_ = function(node) {
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var s = ol.xml.getAllTextContent(node, false).replace(/^\s*|\s*$/g, '');
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var coords = s.split(/\s+/);
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// The "dimension" attribute is from the GML 3.0.1 spec.
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var dim = parseInt(node.getAttribute('srsDimension') ||
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node.getAttribute('dimension'), 10) || 2;
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var x, y, z;
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var flatCoordinates = [];
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for (var i = 0, ii = coords.length; i < ii; i += dim) {
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x = parseFloat(coords[i]);
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y = parseFloat(coords[i + 1]);
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z = (dim === 3) ? parseFloat(coords[i + 2]) : 0;
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// TODO axis orientation
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flatCoordinates.push(x, y, z);
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}
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return flatCoordinates;
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};
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/**
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* @const
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* @type {Object.<string, Object.<string, ol.xml.Parser>>}
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* @private
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*/
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ol.format.GML.GEOMETRY_PARSERS_ = ol.xml.makeParsersNS(
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ol.format.GML.NAMESPACE_URIS_, {
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'Point': ol.xml.makeArrayPusher(ol.format.GML.readPoint_),
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'LineString': ol.xml.makeArrayPusher(ol.format.GML.readLineString_),
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'LinearRing' : ol.xml.makeArrayPusher(ol.format.GML.readLinearRing_),
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'Polygon': ol.xml.makeArrayPusher(ol.format.GML.readPolygon_)
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});
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/**
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* @const
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* @type {Object.<string, Object.<string, ol.xml.Parser>>}
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* @private
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*/
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ol.format.GML.GEOMETRY_FLAT_COORDINATES_PARSERS_ = ol.xml.makeParsersNS(
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ol.format.GML.NAMESPACE_URIS_, {
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'pos': ol.xml.makeReplacer(ol.format.GML.readFlatPos_),
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'posList': ol.xml.makeReplacer(ol.format.GML.readFlatPosList_)
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});
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/**
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* @const
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* @type {Object.<string, Object.<string, ol.xml.Parser>>}
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* @private
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*/
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ol.format.GML.FLAT_LINEAR_RINGS_PARSERS_ = ol.xml.makeParsersNS(
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ol.format.GML.NAMESPACE_URIS_, {
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'interior': ol.format.GML.interiorParser_,
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'exterior': ol.format.GML.exteriorParser_
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});
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/**
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* @const
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* @type {Object.<string, Object.<string, ol.xml.Parser>>}
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* @private
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*/
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ol.format.GML.INTERIOR_PARSERS_ = ol.xml.makeParsersNS(
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ol.format.GML.NAMESPACE_URIS_, {
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'LinearRing': ol.xml.makeReplacer(ol.format.GML.readFlatLinearRing_)
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});
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/**
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* @const
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* @type {Object.<string, Object.<string, ol.xml.Parser>>}
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* @private
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*/
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ol.format.GML.EXTERIOR_PARSERS_ = ol.xml.makeParsersNS(
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ol.format.GML.NAMESPACE_URIS_, {
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'LinearRing': ol.xml.makeReplacer(ol.format.GML.readFlatLinearRing_)
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});
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/**
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* @const
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* @type {Object.<string, Object.<string, ol.xml.Parser>>}
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* @private
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*/
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ol.format.GML.FLAT_LINEAR_RING_PARSERS_ = ol.xml.makeParsersNS(
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ol.format.GML.NAMESPACE_URIS_, {
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'posList': ol.xml.makeReplacer(ol.format.GML.readFlatPosList_)
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});
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