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glennvorhes authoredglennvorhes authored
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SortedFeatures.ts 4.21 KiB
/**
* Created by gavorhes on 12/23/2015.
*/
import provide from '../util/provide';
import Feature from 'ol/Feature';
let nm = provide('olHelpers');
/**
* take an array of features and sort by a given property name
*/
export class SortedFeatures {
sortedFeatures: Array<Feature>;
propertyName: string;
_propertyType: string;
/**
*
* @param {Array<Feature>} features array of ol features
* @param {string} propertyName - the property name to use for lookup
*/
constructor(features: Feature[], propertyName: string) {
this.sortedFeatures = features;
this.propertyName = propertyName;
if (this.sortedFeatures.length > 0) {
this._propertyType = typeof this.sortedFeatures[0].getProperties()[this.propertyName];
let __this = this;
this.sortedFeatures.sort(function (a, b) : number {
if (__this._propertyType == 'number'){
let aMinusB = a['getProperties']()[__this.propertyName] - b['getProperties']()[__this.propertyName];
if (aMinusB == 0){
return 0;
} else {
return aMinusB > 0 ? 1 : -1;
}
} else if (__this._propertyType == 'string'){
let propA = a['getProperties']()[__this.propertyName] || '';
let propB = b['getProperties']()[__this.propertyName] || '';
propA = propA.toString().trim();
propB = propB.toString().trim();
if (propA == propB){
return 0;
} else {
return propA > propB ? 1 : 0;
}
}
});
}
}
/**
* recursive search to find the value
* @param {number|string} propertyValue - the property value to search for
* @param {boolean} [exactMatch=false] if only an exact match should be returned
* @param {Array} [sortedFeatures=this.sortedFeatures] - the candidate features
* @returns {Feature|undefined} the feature matching the lookup
*/
getFeature(propertyValue: number|string, exactMatch: boolean = false, sortedFeatures? :Array<Feature>): Feature {
if (typeof sortedFeatures == 'undefined'){
sortedFeatures = this.sortedFeatures;
}
if (sortedFeatures.length == 0){
return undefined;
}
if (sortedFeatures.length == 1){
if (exactMatch){
if (sortedFeatures[0].getProperties()[this.propertyName] == propertyValue){
return sortedFeatures[0];
} else {
return undefined;
}
} else {
return sortedFeatures[0];
}
}
let lowProp = sortedFeatures[0].getProperties()[this.propertyName];
let highProp = sortedFeatures[sortedFeatures.length - 1].getProperties()[this.propertyName];
if (exactMatch){
if (lowProp == propertyValue){
return sortedFeatures[0];
} else if (propertyValue < lowProp){
return undefined;
} else if (highProp == propertyValue){
return sortedFeatures[sortedFeatures.length - 1];
} else if (propertyValue > highProp){
return undefined;
}
} else {
if (propertyValue <= lowProp){
return sortedFeatures[0];
} else if (propertyValue >= highProp){
return sortedFeatures[sortedFeatures.length - 1];
}
}
let midIndex = Math.floor(sortedFeatures.length / 2);
let midFeature = sortedFeatures[midIndex];
let midProperty = midFeature.getProperties()[this.propertyName];
if (midProperty === propertyValue){
return midFeature;
}
if (propertyValue < midProperty){
return this.getFeature(propertyValue, exactMatch, sortedFeatures.slice(0, midIndex));
} else {
return this.getFeature(propertyValue, exactMatch, sortedFeatures.slice(midIndex));
}
}
}
nm.SortedFeatures = SortedFeatures;
export default SortedFeatures;