All files / FeatureServer/lib/helpers feature-layer-metadata.js

95.65% Statements 44/46
78.94% Branches 15/19
100% Functions 8/8
95.65% Lines 44/46

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 1392x 2x         2x 2x 2x 2x 2x             11x 11x 11x       18x 18x                                                 17x   17x   17x   17x   17x   17x   17x   17x       17x 17x 12x         17x 1x 1x     16x 2x 14x     14x         34x       34x   34x               17x         17x   17x 3x     14x       14x 5x     9x 9x   9x                       2x  
const _ = require('lodash')
const TableLayerMetadata = require('./table-layer-metadata')
const {
  PointRenderer,
  LineRenderer,
  PolygonRenderer
} = require('./renderers')
const { calculateBounds } = require('@terraformer/spatial')
const getSpatialReference = require('./get-spatial-reference')
const getGeometryTypeFromGeojson = require('./get-geometry-type-from-geojson')
const normalizeExtent = require('./normalize-extent')
 
class FeatureLayerMetadata extends TableLayerMetadata {
  static create (geojson, options) {
    const {
      geojson: normalizedGeojson,
      options: normalizedOptions
    } = FeatureLayerMetadata.normalizeInput(geojson, options)
    const layerMetadata = new FeatureLayerMetadata()
    return layerMetadata.mixinOverrides(normalizedGeojson, normalizedOptions)
  }
 
  constructor () {
    super()
    Object.assign(this, {
      type: 'Feature Layer',
      minScale: 0,
      maxScale: 0,
      canScaleSymbols: false,
      drawingInfo: {
        renderer: {},
        labelingInfo: null
      },
      extent: {
        xmin: -180,
        ymin: -90,
        xmax: 180,
        ymax: 90,
        spatialReference: {
          wkid: 4326,
          latestWkid: 4326
        }
      },
      supportsCoordinatesQuantization: false,
      hasLabels: false
    })
  }
 
  mixinOverrides (geojson = {}, options = {}) {
    super.mixinOverrides(geojson, options)
 
    const { renderer, extent, inputCrs, sourceSR, capabilities = {} } = options
 
    this.geometryType = getGeometryTypeFromGeojson({ ...geojson, ...options })
 
    this.supportsCoordinatesQuantization = !!capabilities.quantization
 
    this._setExtent(geojson, { inputCrs, sourceSR, extent })
 
    this._setRenderer(renderer)
 
    this._setDirectOverrides(options)
 
    return this
  }
 
  _setExtent (geojson, options) {
    const extent = getLayerExtent(geojson, options)
    if (extent) {
      this.extent = extent
    }
  }
 
  _setRenderer (renderer) {
    if (renderer) {
      this.drawingInfo.renderer = renderer
      return
    }
 
    if (this.geometryType === 'esriGeometryPolygon') {
      this.drawingInfo.renderer = new PolygonRenderer()
    } else Iif (this.geometryType === 'esriGeometryPolyline') {
      this.drawingInfo.renderer = new LineRenderer()
    } else {
      this.drawingInfo.renderer = new PointRenderer()
    }
  }
 
  _setDirectOverrides (options) {
    super._setDirectOverrides(options)
    const {
      minScale,
      maxScale
    } = options
 
    _.merge(this, {
      minScale,
      maxScale
    })
  }
}
 
function getLayerExtent (geojson, options) {
  const spatialReference = getSpatialReference(geojson, options) || {
    wkid: 4326,
    latestWkid: 4326
  }
 
  const { extent } = options
 
  if (extent) {
    return normalizeExtent(extent, spatialReference)
  }
 
  return calculateExtentFromFeatures(geojson, spatialReference)
}
 
function calculateExtentFromFeatures (geojson, spatialReference) {
  if (!geojson.features || geojson.features.length === 0) {
    return
  }
 
  try {
    const [xmin, ymin, xmax, ymax] = calculateBounds(geojson)
 
    return {
      xmin,
      xmax,
      ymin,
      ymax,
      spatialReference
    }
  } catch (error) {
    console.log(`Could not calculate extent from data: ${error.message}`)
  }
}
 
module.exports = FeatureLayerMetadata