Initial commit
This commit is contained in:
zhongjin
@@ -0,0 +1,813 @@
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const $ = require('jquery');
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const Backbone = require('backbone');
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const _ = require('underscore');
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const TableDataCollection = require('dashboard/data/table/table-data-collection');
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const RowModel = require('dashboard/data/table/row-model');
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const checkAndBuildOpts = require('builder/helpers/required-opts');
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const WKT = require('dashboard/common/wkt');
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const safeTableNameQuoting = require('dashboard/helpers/safe-table-name-quoting');
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const cartoMetadataStatic = require('dashboard/views/public-dataset/carto-table-metadata-static');
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const REQUIRED_OPTS = [
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'configModel'
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];
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module.exports = TableDataCollection.extend({
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_ADDED_ROW_TEXT: 'Row added correctly',
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_ADDING_ROW_TEXT: 'Adding a new row',
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_GEOMETRY_UPDATED: 'Table geometry updated',
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model: function (attrs, opts) {
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var configModel = opts.collection._configModel;
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return new RowModel(attrs, {
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configModel,
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// TODO: Check this
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collection: opts.collection
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});
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},
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initialize: function (models, options) {
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checkAndBuildOpts(options, REQUIRED_OPTS, this);
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this.table = options ? options.table : null;
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this.model.prototype.idAttribute = 'cartodb_id';
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this.initOptions();
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this.filter = null;
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this._fetching = false;
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this.pages = [];
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this.lastPage = false;
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this.bind('newPage', this.newPage, this);
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this.bind('reset', function () {
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var pages = Math.floor(this.size() / this.options.get('rows_per_page'));
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this.pages = [];
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for (var i = 0; i < pages; ++i) {
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this.pages.push(i);
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}
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}, this);
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if (this.table) {
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this.bind('add change:the_geom', function (row) {
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var gt = this.table.get('geometry_types');
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if (gt && gt.length > 0) return;
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if (row.get('the_geom')) {
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// we set it to silent because a change in geometry_types
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// raises rendering and column feching
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this.table.addGeomColumnType(row.getGeomType());
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}
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}, this);
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}
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TableDataCollection.prototype.initialize.call(this);
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},
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initOptions: function () {
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this.options = new Backbone.Model({
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rows_per_page: 40,
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page: 0,
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sort_order: 'asc',
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order_by: 'cartodb_id',
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filter_column: '',
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filter_value: ''
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});
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this.options.bind('change', () => {
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if (this._fetching) {
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return;
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}
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this._fetching = true;
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var opt = {};
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var previous = this.options.previous('page');
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if (this.options.hasChanged('page')) {
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opt.add = true;
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opt.changingPage = true;
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// if user is going backwards insert new rows at the top
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if (previous > this.options.get('page')) {
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opt.at = 0;
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}
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} else {
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if (this.options.hasChanged('mode')) {
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this.options.set({
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'page': 0
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}, { silent: true });
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}
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}
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opt.success = (_coll, resp) => {
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this.trigger('loaded');
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if (resp.rows && resp.rows.length !== 0) {
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if (opt.changingPage) {
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this.trigger('newPage', this.options.get('page'), opt.at === 0 ? 'up' : 'down');
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}
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} else {
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// no data so do not change the page
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this.options.set({page: previous});//, { silent: true });
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}
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this.trigger('endLoadingRows', this.options.get('page'), opt.at === 0 ? 'up' : 'down');
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this._fetching = false;
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};
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opt.error = () => {
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console.error('there was some problem fetching rows');
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this.trigger('endLoadingRows');
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this._fetching = false;
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};
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this.trigger('loadingRows', opt.at === 0 ? 'up' : 'down');
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this.fetch(opt);
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}, this);
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},
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parse: function (d) {
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// when the query modifies the data modified flag is true
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// TODO: change this when SQL API was able to say if a
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// query modify some data
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// HACK, it will fail if using returning sql statement
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this.modify_rows = d.rows.length === 0 && _.size(d.fields) === 0;
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this.affected_rows = d.affected_rows;
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this.lastPage = false;
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if (d.rows.length < this.options.get('rows_per_page')) {
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this.lastPage = true;
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}
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return d.rows;
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},
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// given fields array as they come from SQL create a map name -> type
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_schemaFromQueryFields: function (fields) {
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var sc = {};
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for (var k in fields) {
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sc[k] = fields[k].type;
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}
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return sc;
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},
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_createUrlOptions: function (filter) {
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var attr;
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if (filter) {
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var a = {};
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for (var k in this.options.attributes) {
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if (filter(k)) {
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a[k] = this.options.attributes[k];
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}
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}
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attr = _(a);
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} else {
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attr = _(this.options.attributes);
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}
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var params = attr.map(function (v, k) {
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return k + '=' + encodeURIComponent(v);
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}).join('&');
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params += '&api_key=' + this._configModel.get('api_key');
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return params;
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},
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_geometryColumnSQL: function (c) {
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return [
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'CASE',
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'WHEN GeometryType(' + c + ") = 'POINT' THEN",
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'ST_AsGeoJSON(' + c + ',8)',
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'WHEN (' + c + ' IS NULL) THEN',
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'NULL',
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'ELSE',
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'GeometryType(' + c + ')',
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'END ' + c
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].join(' ');
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},
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// return wrapped SQL removing the_geom and the_geom_webmercator
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// to avoid fetching those columns.
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// So for a sql like
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// select * from table the returned value is
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// select column1, column2, column3... from table
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wrappedSQL: function (schema, exclude, fetchGeometry) {
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exclude = exclude || ['the_geom_webmercator'];
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schema = _.clone(schema);
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var select_columns = _.chain(schema).omit(exclude).map((v, k) => {
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if (v === 'geometry') {
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if (fetchGeometry) {
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return 'st_astext("' + k + '") ' + 'as ' + k;
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}
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return this._geometryColumnSQL(k);
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}
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return '"' + k + '"';
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}).value();
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select_columns = select_columns.join(',');
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var mode = this.options.get('sort_order') === 'desc' ? 'desc' : 'asc';
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var q = 'select ' + select_columns + ' from (' + this.getSQL() + ') __wrapped';
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var order_by = this.options.get('order_by');
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if (order_by && order_by.length > 0) {
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q += ' order by ' + order_by + ' ' + mode;
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}
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return q;
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},
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url: function () {
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return this.sqlApiUrl();
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},
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/**
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* we need to override sync to avoid the sql request to be sent by GET.
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* For security reasons, we need them to be send as a PUT request.
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* @method sync
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* @param method {'save' || 'read' || 'delete' || 'create'}
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* @param model {Object}
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* @param options {Object}
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*/
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sync: function (method, model, options) {
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if (!options) { options = {}; }
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options.data = this._createUrlOptions(function (d) {
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return d !== 'sql';
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});
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if (cartoMetadataStatic.alterTableData(this.options.get('sql') || '')) {
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options.data += '&q=' + encodeURIComponent(this.options.get('sql'));
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options.type = 'POST';
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} else {
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// when a geometry can be lazy fetched, don't fetch it
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var fetchGeometry = 'cartodb_id' in this.query_schema;
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options.data += '&q=' + encodeURIComponent(this.wrappedSQL(this.query_schema, [], !fetchGeometry));
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if (options.data.length > 2048) {
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options.type = 'POST';
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}
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}
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return Backbone.sync.call(this, method, this, options);
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},
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sqlApiUrl: function () {
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return this._configModel.getSqlApiUrl();
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},
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setOptions: function (opt) {
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this.options.set(opt);
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},
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// Refresh all table data
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refresh: function () {
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this.fetch();
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},
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isFetchingPage: function () {
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return this._fetching;
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},
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loadPageAtTop: function () {
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if (!this._fetching) {
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var first = this.pages[0];
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if (first > 0) {
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this.options.set('page', first - 1);
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}
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}
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},
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loadPageAtBottom: function () {
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if (!this._fetching) {
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var last = this.pages[this.pages.length - 1];
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if (!this.lastPage) {
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this.options.set('page', last + 1);
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}
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}
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},
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/**
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* called when a new page is loaded
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* removes the models to max
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*/
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newPage: function (currentPage, direction) {
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if (this.pages.indexOf(currentPage) < 0) {
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this.pages.push(currentPage);
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}
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this.pages.sort(function (a, b) {
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return Number(a) > Number(b);
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});
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// remove blocks if there are more rows than allowed
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var rowspp = this.options.get('rows_per_page');
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var max_items = rowspp * 4;
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if (this.size() > max_items) {
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if (direction == 'up') { // eslint-disable-line eqeqeq
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// remove page from the bottom (the user is going up)
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this.pages.pop();
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this.remove(this.models.slice(max_items, this.size()));
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} else {
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// remove page from the top (the user is going down)
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this.pages.shift();
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this.remove(this.models.slice(0, rowspp));
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}
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}
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},
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addRow: function (opts) {
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this.table.notice(this._ADDING_ROW_TEXT, 'load', 0);
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opts = opts || {};
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_.extend(opts, {
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wait: true,
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success: () => {
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this.table.notice(this._ADDED_ROW_TEXT);
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},
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error: (e, resp) => {
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// TODO: notice user
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this.table.error(this._ADDING_ROW_TEXT, resp);
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}
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});
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return this.create(null, opts);
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},
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/**
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* creates a new row model in local, it is NOT serialized to the server
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*/
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newRow: function (attrs) {
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var r = new RowModel(attrs, {
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configModel: this._configModel
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});
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r.table = this.table;
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r.bind('saved', function _saved () {
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if (r.table.data().length === 0) {
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r.table.data().fetch();
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r.unbind('saved', _saved, r.table);
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}
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}, r.table);
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return r;
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},
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/**
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* return a model row
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*/
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getRow: function (id, options) {
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options = options || {};
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var r = this.get(id);
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if (!r) {
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r = new RowModel({cartodb_id: id}, { configModel: this._configModel });
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}
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if (!options.no_add) {
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this.table._data.add(r);
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}
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r.table = this.table;
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return r;
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},
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getRowAt: function (index) {
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var r = this.at(index);
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r.table = this.table;
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return r;
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},
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deleteRow: function (row_id) {
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},
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isReadOnly: function () {
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return false;
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},
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quartiles: function (nslots, column, callback, error) {
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var tmpl = _.template('select quartile, max(<%= column %>) as maxamount from (select <%= column %>, ntile(<%= slots %>) over (order by <%= column %>) as quartile from (<%= sql %>) _table_sql where <%= column %> is not null) x group by quartile order by quartile');
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this._sqlQuery(tmpl({
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slots: nslots,
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sql: this.getSQL(),
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column: column
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}),
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function (data) {
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callback(_(data.rows).pluck('maxamount'));
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},
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error);
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},
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equalInterval: function (nslots, column, callback, error) {
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var tmpl = _.template(`
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with params as (select min(a), max(a) from ( select <%= column %> as a from (<%= sql %>) _table_sql where <%= column %> is not null ) as foo )
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select (max-min)/<%= slots %> as s, min, max from params`
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);
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this._sqlQuery(tmpl({
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slots: nslots,
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sql: this.getSQL(),
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column: column
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}),
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function (data) {
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var min = data.rows[0].min;
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var max = data.rows[0].max;
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var range = data.rows[0].s;
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var values = [];
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for (var i = 1, l = nslots; i < l; i++) {
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values.push((range * i) + min);
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}
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// Add last value
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values.push(max);
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// Callback
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callback(values);
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},
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error);
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},
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_quantificationMethod: function (functionName, nslots, column, distinct, callback, error) {
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var tmpl = _.template('select unnest(<%= functionName %>(array_agg(<%= simplify_fn %>((<%= column %>::numeric))), <%= slots %>)) as buckets from (<%= sql %>) _table_sql where <%= column %> is not null');
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this._sqlQuery(tmpl({
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slots: nslots,
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sql: this.getSQL(),
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column: column,
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functionName: functionName,
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simplify_fn: 'distinct'
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}),
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function (data) {
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callback(_(data.rows).pluck('buckets'));
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},
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error);
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},
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discreteHistogram: function (nbuckets, column, callback, error) {
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var query = 'SELECT DISTINCT(<%= column %>) AS bucket, count(*) AS value FROM (<%= sql %>) _table_sql GROUP BY <%= column %> ORDER BY value DESC LIMIT <%= nbuckets %> + 1';
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var sql = _.template(query, {
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column: column,
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nbuckets: nbuckets,
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sql: this.getSQL()
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});
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this._sqlQuery(sql, function (data) {
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var count = data.rows.length;
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var reached_limit = false;
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if (count > nbuckets) {
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data.rows = data.rows.slice(0, nbuckets);
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reached_limit = true;
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}
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callback({ rows: data.rows, reached_limit: reached_limit }); // eslint-disable-line
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});
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},
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date_histogram: function (nbuckets, column, callback, error) {
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column = 'EXTRACT(EPOCH FROM ' + column + '::TIMESTAMP WITH TIME ZONE )';
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var tmpl = _.template(
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'with bounds as ( ' +
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'SELECT ' +
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'current_timestamp as tz, ' +
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'min(<%= column %>) as lower, ' +
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'max(<%= column %>) as upper, ' +
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'(max(<%= column %>) - min(<%= column %>)) as span, ' +
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'CASE WHEN ABS((max(<%= column %>) - min(<%= column %>))/<%= nbuckets %>) <= 0 THEN 1 ELSE GREATEST(1.0, pow(10,ceil(log((max(<%= column %>) - min(<%= column %>))/<%= nbuckets %>)))) END as bucket_size ' +
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'FROM (<%= sql %>) _table_sql ' +
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') ' +
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'select array_agg(v) val, array_agg(bucket) buckets, tz, bounds.upper, bounds.lower, bounds.span, bounds.bucket_size from ' +
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'( ' +
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'select ' +
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'count(<%= column %>) as v, ' +
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'round((<%= column %> - bounds.lower)/bounds.bucket_size) as bucket ' +
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'from (<%= sql %>) _table_sql, bounds ' +
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'where <%= column %> is not null ' +
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'group by bucket order by bucket ' +
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') a, bounds ' +
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'group by ' +
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'bounds.upper, bounds.lower, bounds.span, bounds.bucket_size, bounds.tz ');
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||||
// transform array_agg from postgres to a js array
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function agg_array (a) {
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return a.map(function (v) { return parseFloat(v); });
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}
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this._sqlQuery(tmpl({
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nbuckets: nbuckets,
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sql: this.getSQL(),
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||||
column: column
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||||
}),
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||||
|
||||
function (data) {
|
||||
if (!data.rows || data.rows.length === 0) {
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callback(null, null);
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return;
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||||
}
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||||
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data = data.rows[0];
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||||
data.val = agg_array(data.val);
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data.buckets = agg_array(data.buckets);
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||||
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||||
var hist = [];
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||||
var bounds = {};
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||||
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||||
// create a sorted array and normalize
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||||
var upper = data.upper;
|
||||
var lower = data.lower;
|
||||
var tz = data.tz;
|
||||
var bucket_size = data.bucket_size;
|
||||
var max;
|
||||
|
||||
max = data.val[0];
|
||||
|
||||
for (var r = 0; r < data.buckets.length; ++r) {
|
||||
var b = data.buckets[r];
|
||||
var v = hist[b] = data.val[r];
|
||||
max = Math.max(max, v);
|
||||
}
|
||||
|
||||
// var maxBucket = _.max(data.buckets)
|
||||
for (var i = 0; i < hist.length; ++i) {
|
||||
if (hist[i] === undefined) {
|
||||
hist[i] = 0;
|
||||
} else {
|
||||
hist[i] = hist[i] / max;
|
||||
}
|
||||
}
|
||||
|
||||
bounds.upper = parseFloat(upper);
|
||||
bounds.lower = parseFloat(lower);
|
||||
bounds.bucket_size = parseFloat(bucket_size);
|
||||
bounds.tz = tz;
|
||||
|
||||
callback(hist, bounds);
|
||||
},
|
||||
|
||||
error);
|
||||
},
|
||||
|
||||
histogram: function (nbuckets, column, callback, error) {
|
||||
var tmpl = _.template(
|
||||
'with bounds as ( ' +
|
||||
'SELECT ' +
|
||||
'min(<%= column %>) as lower, ' +
|
||||
'max(<%= column %>) as upper, ' +
|
||||
'(max(<%= column %>) - min(<%= column %>)) as span, ' +
|
||||
'CASE WHEN ABS((max(<%= column %>) - min(<%= column %>))/<%= nbuckets %>) <= 0 THEN 1 ELSE GREATEST(1.0, pow(10,ceil(log((max(<%= column %>) - min(<%= column %>))/<%= nbuckets %>)))) END as bucket_size ' +
|
||||
'FROM (<%= sql %>) _table_sql ' +
|
||||
') ' +
|
||||
'select array_agg(v) val, array_agg(bucket) buckets, bounds.upper, bounds.lower, bounds.span, bounds.bucket_size from ' +
|
||||
'( ' +
|
||||
'select ' +
|
||||
'count(<%= column %>) as v, ' +
|
||||
'round((<%= column %> - bounds.lower)/bounds.bucket_size) as bucket ' +
|
||||
'from (<%= sql %>) _table_sql, bounds ' +
|
||||
'where <%= column %> is not null ' +
|
||||
'group by bucket order by bucket ' +
|
||||
') a, bounds ' +
|
||||
'group by ' +
|
||||
'bounds.upper, ' +
|
||||
'bounds.lower, bounds.span, bounds.bucket_size ');
|
||||
|
||||
// transform array_agg from postgres to a js array
|
||||
function agg_array (a) {
|
||||
return a.map(function (v) { return parseFloat(v); });
|
||||
// return JSON.parse(a.replace('{', '[').replace('}', ']'))
|
||||
}
|
||||
|
||||
this._sqlQuery(tmpl({
|
||||
nbuckets: nbuckets,
|
||||
sql: this.getSQL(),
|
||||
column: column
|
||||
}),
|
||||
|
||||
function (data) {
|
||||
if (!data.rows || data.rows.length === 0) {
|
||||
callback(null, null);
|
||||
return;
|
||||
}
|
||||
|
||||
data = data.rows[0];
|
||||
|
||||
data.val = agg_array(data.val);
|
||||
data.buckets = agg_array(data.buckets);
|
||||
|
||||
var hist = [];
|
||||
var bounds = {};
|
||||
|
||||
// create a sorted array and normalize
|
||||
var upper = data.upper;
|
||||
var lower = data.lower;
|
||||
var bucket_size = data.bucket_size;
|
||||
var max;
|
||||
|
||||
max = data.val[0];
|
||||
|
||||
for (var r = 0; r < data.buckets.length; ++r) {
|
||||
var b = data.buckets[r];
|
||||
var v = hist[b] = data.val[r];
|
||||
max = Math.max(max, v);
|
||||
}
|
||||
|
||||
// var maxBucket = _.max(data.buckets)
|
||||
for (var i = 0; i < hist.length; ++i) {
|
||||
if (hist[i] === undefined) {
|
||||
hist[i] = 0;
|
||||
} else {
|
||||
hist[i] = hist[i] / max;
|
||||
}
|
||||
}
|
||||
|
||||
bounds.upper = parseFloat(upper);
|
||||
bounds.lower = parseFloat(lower);
|
||||
bounds.bucket_size = parseFloat(bucket_size);
|
||||
|
||||
callback(hist, bounds);
|
||||
},
|
||||
|
||||
error);
|
||||
},
|
||||
|
||||
jenkBins: function (nslots, column, callback, error) {
|
||||
this._quantificationMethod('CDB_JenksBins', nslots, column, true, callback, error);
|
||||
},
|
||||
|
||||
headTails: function (nslots, column, callback, error) {
|
||||
this._quantificationMethod('CDB_HeadsTailsBins', nslots, column, false, callback, error);
|
||||
},
|
||||
|
||||
quantileBins: function (nslots, column, callback, error) {
|
||||
this._quantificationMethod('CDB_QuantileBins', nslots, column, false, callback, error);
|
||||
},
|
||||
|
||||
categoriesForColumn: function (max_values, column, callback, error) {
|
||||
var tmpl = _.template('SELECT <%= column %>, count(<%= column %>) FROM (<%= sql %>) _table_sql ' +
|
||||
'GROUP BY <%= column %> ORDER BY count DESC LIMIT <%= max_values %> '
|
||||
);
|
||||
|
||||
this._sqlQuery(tmpl({
|
||||
sql: this.getSQL(),
|
||||
column: column,
|
||||
max_values: max_values + 1
|
||||
}),
|
||||
function (data) {
|
||||
callback({// eslint-disable-line
|
||||
type: data.fields[column].type || 'string',
|
||||
categories: _(data.rows).pluck(column)
|
||||
});
|
||||
},
|
||||
error);
|
||||
},
|
||||
|
||||
/**
|
||||
* call callback with the geometry bounds
|
||||
*/
|
||||
geometryBounds: function (callback) {
|
||||
var tmpl = _.template('SELECT ST_XMin(ST_Extent(the_geom)) as minx,ST_YMin(ST_Extent(the_geom)) as miny, ST_XMax(ST_Extent(the_geom)) as maxx,ST_YMax(ST_Extent(the_geom)) as maxy from (<%= sql %>) _table_sql');
|
||||
this._sqlQuery(tmpl({
|
||||
sql: this.getSQL()
|
||||
}),
|
||||
function (result) {
|
||||
var coordinates = result.rows[0];
|
||||
|
||||
var lon0 = coordinates.maxx;
|
||||
var lat0 = coordinates.maxy;
|
||||
var lon1 = coordinates.minx;
|
||||
var lat1 = coordinates.miny;
|
||||
|
||||
var minlat = -85.0511;
|
||||
var maxlat = 85.0511;
|
||||
var minlon = -179;
|
||||
var maxlon = 179;
|
||||
|
||||
var clampNum = function (x, min, max) {
|
||||
return x < min ? min : x > max ? max : x;
|
||||
};
|
||||
|
||||
lon0 = clampNum(lon0, minlon, maxlon);
|
||||
lon1 = clampNum(lon1, minlon, maxlon);
|
||||
lat0 = clampNum(lat0, minlat, maxlat);
|
||||
lat1 = clampNum(lat1, minlat, maxlat);
|
||||
callback([ [lat0, lon0], [lat1, lon1]]); // eslint-disable-line
|
||||
}
|
||||
);
|
||||
},
|
||||
|
||||
_sqlQuery: function (sql, callback, error, type) {
|
||||
var s = encodeURIComponent(sql);
|
||||
return $.ajax({
|
||||
type: type || 'POST',
|
||||
data: 'q=' + s + '&api_key=' + this._configModel.get('api_key'),
|
||||
url: this.url(),
|
||||
success: callback,
|
||||
error: error
|
||||
});
|
||||
},
|
||||
|
||||
getSQL: function () {
|
||||
// use table.id to fetch data because if always contains the real table name
|
||||
return 'select * from ' + safeTableNameQuoting(this.table.get('id'));
|
||||
},
|
||||
|
||||
fetch: function (opts) {
|
||||
opts = opts || {};
|
||||
if (!opts || !opts.add) {
|
||||
this.options.attributes.page = 0;
|
||||
this.options._previousAttributes.page = 0;
|
||||
this.pages = [];
|
||||
}
|
||||
var error = opts.error;
|
||||
opts.error = (model, resp) => {
|
||||
this.fetched = true;
|
||||
this.trigger('error', model, resp);
|
||||
error && error(model, resp);
|
||||
};
|
||||
var success = opts.success;
|
||||
opts.success = (model, resp) => {
|
||||
this.fetched = true;
|
||||
success && success.apply(this, arguments);
|
||||
};
|
||||
this._fetch(opts);
|
||||
},
|
||||
|
||||
_fetch: function (opts) {
|
||||
var MAX_GET_LENGTH = 1024;
|
||||
this.trigger('loading', opts);
|
||||
|
||||
var sql = this.getSQL();
|
||||
// if the query changes the database just send it
|
||||
if (cartoMetadataStatic.alterTableData(sql)) {
|
||||
TableDataCollection.prototype.fetch.call(this, opts);
|
||||
return;
|
||||
}
|
||||
|
||||
// use get to fetch the schema, probably cached
|
||||
this._sqlQuery(_.template('select * from (<%= sql %>) __wrapped limit 0')({ sql: sql }), (data) => {
|
||||
// get schema
|
||||
this.query_schema = this._schemaFromQueryFields(data.fields);
|
||||
if (!this.table.isInSQLView()) {
|
||||
if ('the_geom' in this.query_schema) {
|
||||
delete this.query_schema['the_geom_webmercator'];
|
||||
}
|
||||
}
|
||||
TableDataCollection.prototype.fetch.call(this, opts);
|
||||
}, (err) => {
|
||||
this.trigger('error', this, err);
|
||||
}, sql.length > MAX_GET_LENGTH ? 'POST' : 'GET');
|
||||
},
|
||||
|
||||
/**
|
||||
* with the data from the rows fetch create an schema
|
||||
* if the schema from original table is passed the method
|
||||
* set the column types according to it
|
||||
* return an empty list if no data was fetch
|
||||
*/
|
||||
schemaFromData: function (originalTableSchema) {
|
||||
// build schema in format [ [field, type] , ...]
|
||||
return cartoMetadataStatic.sortSchema(_(this.query_schema).map(function (v, k) {
|
||||
return [k, v];
|
||||
}));
|
||||
},
|
||||
|
||||
geometryTypeFromGeoJSON: function (geojson) {
|
||||
try {
|
||||
var geo = JSON.parse(geojson);
|
||||
return geo.type;
|
||||
} catch (e) {
|
||||
}
|
||||
},
|
||||
|
||||
geometryTypeFromWKT: function (wkt) {
|
||||
if (!wkt) return null;
|
||||
var types = WKT.types;
|
||||
wkt = wkt.toUpperCase();
|
||||
for (var i = 0; i < types.length; ++i) {
|
||||
var t = types[i];
|
||||
if (wkt.indexOf(t) !== -1) {
|
||||
return t;
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
geometryTypeFromWKB: function (wkb) {
|
||||
if (!wkb) return null;
|
||||
|
||||
var typeMap = {
|
||||
'0001': 'Point',
|
||||
'0002': 'LineString',
|
||||
'0003': 'Polygon',
|
||||
'0004': 'MultiPoint',
|
||||
'0005': 'MultiLineString',
|
||||
'0006': 'MultiPolygon'
|
||||
};
|
||||
|
||||
var bigendian = wkb[0] === '0' && wkb[1] === '0';
|
||||
var type = wkb.substring(2, 6);
|
||||
if (!bigendian) {
|
||||
// swap '0100' => '0001'
|
||||
type = type[2] + type[3] + type[0] + type[1];
|
||||
}
|
||||
return typeMap[type];
|
||||
},
|
||||
|
||||
//
|
||||
// guesses from the first row the geometry types involved
|
||||
// returns an empty array where there is no rows
|
||||
// return postgist types, like st_GEOTYPE
|
||||
//
|
||||
getGeometryTypes: function () {
|
||||
var row = null;
|
||||
var i = this.size();
|
||||
while (i-- && !(row && row.get('the_geom'))) {
|
||||
row = this.at(i);
|
||||
}
|
||||
if (!row) return [];
|
||||
var geom = row.get('the_geom') || row.get('the_geom_webmercator');
|
||||
var geoType = this.geometryTypeFromWKB(geom) || this.geometryTypeFromWKT(geom);
|
||||
if (geoType) {
|
||||
return ['ST_' + geoType[0].toUpperCase() + geoType.substring(1).toLowerCase()];
|
||||
}
|
||||
return [];
|
||||
}
|
||||
|
||||
});
|
||||
Reference in New Issue
Block a user