141 lines
3.7 KiB
JavaScript
141 lines
3.7 KiB
JavaScript
'use strict';
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// jshint ignore:start
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var Pg = require('./../pg');
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var _ = require('underscore');
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var geojson = require('./geojson');
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var TopoJSON = require('topojson');
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function TopoJsonFormat () {
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this.features = [];
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}
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TopoJsonFormat.prototype = new Pg('topojson');
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TopoJsonFormat.prototype.getQuery = function (sql, options) {
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return geojson.prototype.getQuery(sql, options) + ' where ' + options.gn + ' is not null';
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};
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TopoJsonFormat.prototype.handleQueryRow = function (row) {
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var _geojson = {
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type: 'Feature'
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};
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_geojson.geometry = JSON.parse(row[this.opts.gn]);
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delete row[this.opts.gn];
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delete row.the_geom_webmercator;
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_geojson.properties = row;
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this.features.push(_geojson);
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};
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TopoJsonFormat.prototype.handleQueryEnd = function () {
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if (this.error) {
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this.callback(this.error);
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return;
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}
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if (this.opts.profiler) {
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this.opts.profiler.done('gotRows');
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}
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var topology = TopoJSON.topology(this.features, {
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quantization: 1e4,
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'force-clockwise': true,
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'property-filter': function (d) {
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return d;
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}
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});
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this.features = [];
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var stream = this.opts.sink;
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var jsonpCallback = this.opts.callback;
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var bufferedRows = this.opts.bufferedRows;
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var buffer = '';
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var immediately = global.setImmediate || process.nextTick;
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function streamObjectSubtree (obj, key, done) {
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buffer += '"' + key + '":';
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var isObject = _.isObject(obj[key]);
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var isArray = _.isArray(obj[key]);
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var isIterable = isArray || isObject;
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if (isIterable) {
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buffer += isArray ? '[' : '{';
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var subtreeKeys = Object.keys(obj[key]);
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var pos = 0;
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function streamNext () {
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immediately(function () {
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var subtreeKey = subtreeKeys.shift();
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if (!isArray) {
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buffer += '"' + subtreeKey + '":';
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}
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buffer += JSON.stringify(obj[key][subtreeKey]);
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if (pos++ % (bufferedRows || 1000)) {
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stream.write(buffer);
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buffer = '';
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}
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if (subtreeKeys.length > 0) {
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delete obj[key][subtreeKey];
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buffer += ',';
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streamNext();
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} else {
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buffer += isArray ? ']' : '}';
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stream.write(buffer);
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buffer = '';
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done();
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}
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});
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}
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streamNext();
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} else {
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buffer += JSON.stringify(obj[key]);
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done();
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}
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}
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if (jsonpCallback) {
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buffer += jsonpCallback + '(';
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}
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buffer += '{';
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var keys = Object.keys(topology);
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function sendResponse () {
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immediately(function () {
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var key = keys.shift();
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function done () {
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if (keys.length > 0) {
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delete topology[key];
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buffer += ',';
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sendResponse();
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} else {
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buffer += '}';
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if (jsonpCallback) {
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buffer += ')';
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}
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stream.write(buffer);
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stream.end();
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topology = null;
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}
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}
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streamObjectSubtree(topology, key, done);
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});
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}
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sendResponse();
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this.callback();
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};
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TopoJsonFormat.prototype.cancel = function () {
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if (this.queryCanceller) {
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this.queryCanceller.call();
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}
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};
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module.exports = TopoJsonFormat;
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// jshint ignore:end
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