/
capabilities.service.ts
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/
capabilities.service.ts
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import { Injectable } from '@angular/core';
import { HttpClient, HttpParams } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { ObjectUtils } from '../../utils';
import { TimeFilterOptions } from '../../filter';
import { WMTSDataSourceOptions, WMSDataSourceOptions } from './datasources';
import ol = require('openlayers');
@Injectable()
export class CapabilitiesService {
private capabilitiesStore: any[] = [];
private parsers = {
'wms': new ol.format.WMSCapabilities(),
'wmts': new ol.format.WMTSCapabilities()
};
constructor(private http: HttpClient) { }
getWMSOptions(baseOptions: WMSDataSourceOptions):
Observable<WMSDataSourceOptions> {
const url = baseOptions.url;
const version = (baseOptions.params as any).version;
return this.getCapabilities('wms', url, version)
.map((capabilities: any) =>
this.parseWMSOptions(baseOptions, capabilities));
}
getWMTSOptions(baseOptions: WMTSDataSourceOptions):
Observable<WMTSDataSourceOptions> {
const url = baseOptions.url;
const version = baseOptions.version;
const options = this.getCapabilities('wmts', url, version)
.map((capabilities: any) =>
this.parseWMTSOptions(baseOptions, capabilities));
return options;
}
getCapabilities(service: 'wms' | 'wmts',
baseUrl: string,
version?: string): Observable<any> {
const params = new HttpParams({
fromObject: {
request: 'GetCapabilities',
service: service,
version: version || '1.3.0'
}
});
const url = baseUrl + '?' + params.toString();
const cached = this.capabilitiesStore.find(value => value.url === url);
if (cached !== undefined) {
return new Observable(c => c.next(cached.capabilities));
}
const request = this.http.get(baseUrl, {
params: params,
responseType: 'text'
});
return request
.map((res) => {
const capabilities = this.parsers[service].read(res);
this.cache(url, capabilities);
return capabilities;
});
}
private parseWMSOptions(baseOptions: WMSDataSourceOptions,
capabilities: any): WMSDataSourceOptions {
const layers = (baseOptions.params as any).layers;
const layer = this.findDataSourceInCapabilities(
capabilities.Capability.Layer, layers);
if (!layer) {
return baseOptions;
}
const metadata = layer.DataURL ? layer.DataURL[0] : undefined;
const options: WMSDataSourceOptions = ObjectUtils.removeUndefined({
// Save title under "alias" because we want to overwrite
// the default, mandatory title. If the title defined
// in the context is to be used along with the
// "optionsFromCapabilities" option, then it should be
// defined under "alias" in the context
alias: layer.Title,
view: {
maxResolution: this.getResolutionFromScale(layer.MaxScaleDenominator) || Infinity,
minResolution: this.getResolutionFromScale(layer.MinScaleDenominator) || 0
},
metadata: {
url: metadata ? metadata.OnlineResource : undefined
},
timeFilter: this.getTimeFilter(layer)
});
return ObjectUtils.mergeDeep(options, baseOptions);
}
private parseWMTSOptions(baseOptions: WMTSDataSourceOptions,
capabilities: any): WMTSDataSourceOptions {
const options = ol.source.WMTS.optionsFromCapabilities(
capabilities, baseOptions);
return Object.assign(options, baseOptions);
}
private findDataSourceInCapabilities(layerArray, name): any {
if (Array.isArray(layerArray)) {
let layer;
layerArray.find(value => {
layer = this.findDataSourceInCapabilities(value, name);
return layer !== undefined;
}, this);
return layer;
} else if (layerArray.Layer) {
return this.findDataSourceInCapabilities(layerArray.Layer, name);
} else {
if (layerArray.Name && layerArray.Name === name) {
return layerArray;
}
return undefined;
}
}
private cache(url: string, capabilities: any) {
this.capabilitiesStore.push({
url: url,
capabilities: capabilities
});
}
private getResolutionFromScale(scale: number): number {
const dpi = 25.4 / 0.28;
return scale / (39.37 * dpi);
}
private getTimeFilter(layer): TimeFilterOptions {
let dimension;
if (layer.Dimension) {
const timeFilter: TimeFilterOptions = {};
dimension = layer.Dimension[0];
if (dimension.values) {
const minMaxDim = dimension.values.split('/');
timeFilter.min = minMaxDim[0] !== undefined ? minMaxDim[0] : undefined;
timeFilter.max = minMaxDim[1] !== undefined ? minMaxDim[1] : undefined;
timeFilter.step = minMaxDim[2] !== undefined ? minMaxDim[2] : undefined;
}
if (dimension.default) {
timeFilter.value = dimension.default;
}
return timeFilter;
}
}
}