86 lines
2.2 KiB
JavaScript
86 lines
2.2 KiB
JavaScript
var _ = require('underscore');
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var pg = require('./pg');
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var ArrayBufferSer = require("../bin_encoder");
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function BinaryFormat() {}
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BinaryFormat.prototype = new pg('arraybuffer');
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BinaryFormat.prototype._contentType = "application/octet-stream";
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BinaryFormat.prototype._extractTypeFromName = function(name) {
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var g = name.match(/.*__(uintclamp|uint|int|float)(8|16|32)/i);
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if(g && g.length === 3) {
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var typeName = g[1] + g[2];
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return ArrayBufferSer.typeNames[typeName];
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}
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};
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// jshint maxcomplexity:12
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BinaryFormat.prototype.transform = function(result, options, callback) {
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var total_rows = result.rowCount;
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var rows = result.rows;
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// get headers
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if(!total_rows) {
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callback(null, new Buffer(0));
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return;
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}
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var headersNames = Object.keys(rows[0]);
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var headerTypes = [];
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if(_.contains(headersNames, 'the_geom')) {
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callback(new Error("geometry types are not supported"), null);
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return;
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}
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try {
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var i;
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var t;
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// get header types (and guess from name)
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for(i = 0; i < headersNames.length; ++i) {
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r = rows[0];
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n = headersNames[i];
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if(typeof(r[n]) === 'string') {
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headerTypes.push(ArrayBufferSer.STRING);
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} else if(typeof(r[n]) === 'object') {
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t = this._extractTypeFromName(n);
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t = t || ArrayBufferSer.FLOAT32;
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headerTypes.push(ArrayBufferSer.BUFFER + t);
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} else {
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t = this._extractTypeFromName(n);
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headerTypes.push(t || ArrayBufferSer.FLOAT32);
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}
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}
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// pack the data
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var header = new ArrayBufferSer(ArrayBufferSer.STRING, headersNames);
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var data = [header];
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for(i = 0; i < headersNames.length; ++i) {
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var d = [];
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var n = headersNames[i];
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for(var r = 0; r < total_rows; ++r) {
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var row = rows[r][n];
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if(headerTypes[i] > ArrayBufferSer.BUFFER) {
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row = new ArrayBufferSer(headerTypes[i] - ArrayBufferSer.BUFFER, row);
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}
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d.push(row);
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}
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var b = new ArrayBufferSer(headerTypes[i], d);
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data.push(b);
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}
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// create the final buffer
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var all = new ArrayBufferSer(ArrayBufferSer.BUFFER, data);
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callback(null, all.buffer);
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} catch(e) {
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callback(e, null);
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}
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};
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module.exports = BinaryFormat;
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