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Querent.js
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Querent.js
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// The MIT License (MIT)
//
// Copyright (c) 2018-2021 Camptocamp SA
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import {getOverlayDefs} from 'api/Themes.js';
import {appendParams as olUriAppendParams} from 'ol/uri.js';
import olFormatGML2 from 'ol/format/GML2.js';
import olFormatWFS from 'ol/format/WFS.js';
import {buffer, createOrUpdateFromCoordinate} from 'ol/extent.js';
/**
* Click tolerance in pixel
* @type {number}
*/
const TOLERANCE = 10;
/**
* @param {import('./Themes.js').overlayDefinition} def Overlay definition.
* @return {boolean} Is the overlay queryable.
*/
function querable(def) {
return def.layer.type === 'WMS' && !!def.ogcServer.wfsSupport && !!def.ogcServer.urlWfs;
}
/**
* Issues a simple WFS GetFeature request for a single layer to fetch
* specific features using their ids.
*
* Requirements:
* - the layer must exist within the loaded themes
* - it must be queryable
* - it must support WFS
* - feature ids must exist
*
* @param {string} layer Name of the layer to query
* @param {string[]} ids List of ids
* @return {Promise<Array<import('ol/Feature.js').default<import("ol/geom/Geometry.js").default>>>} Promise.
* @hidden
*/
export function getFeaturesFromIds(layer, ids) {
return new Promise((resolve, reject) => {
getOverlayDefs().then((overlayDefs) => {
/** @type {Array<import('ol/Feature.js').default<import("ol/geom/Geometry.js").default>>} */
let features = [];
const overlayDef = overlayDefs.get(layer);
if (!overlayDef) {
reject(`Layer "${layer}" was not found in themes.`);
return;
}
if (!querable(overlayDef)) {
reject(`Layer "${layer}" does not support WFS.`);
return;
}
const gmfLayer = /** @type {import('gmf/themes.js').GmfLayerWMS} */ (
/** @type {any} */ (overlayDef.layer)
);
const childLayerNames = [];
/** @type {string[]} */
let featureIds = [];
for (const childLayer of gmfLayer.childLayers) {
childLayerNames.push(childLayer.name);
featureIds = featureIds.concat(ids.map((id) => `${childLayer.name}.${id}`));
}
const params = {
'FEATUREID': featureIds.join(','),
'MAXFEATURES': featureIds.length,
'REQUEST': 'GetFeature',
'SERVICE': 'WFS',
'TYPENAME': childLayerNames.join(','),
'VERSION': '1.0.0',
};
const url = olUriAppendParams(overlayDef.ogcServer.urlWfs, params);
fetch(url)
.then((response) =>
response.text().then((responseText) => {
const wfsFormat = new olFormatWFS({
featureNS: overlayDef.ogcServer.namespace,
gmlFormat: new olFormatGML2(),
});
features = /** @type {Array<import('ol/Feature').default<import('ol/geom/Geometry').default>>} */ (wfsFormat.readFeatures(
responseText
));
})
)
.catch((response) => {
console.error(`WFS GetFeature request failed, response: ${response}`);
})
.then(() => {
resolve(features);
});
});
});
}
/**
* @param {string} layer Name of the layer to query
* @param {number[]} coordinate Coordinate.
* @param {number} resolution Resolution
*
* @return {Promise<import('ol/Feature.js').default<import('ol/geom/Geometry.js').default>>} Promise.
* @hidden
*/
export function getFeaturesFromCoordinates(layer, coordinate, resolution) {
return new Promise((resolve, reject) => {
getOverlayDefs().then((overlayDefs) => {
const overlayDef = overlayDefs.get(layer);
if (!overlayDef) {
reject(`Layer "${layer}" was not found in themes.`);
return;
}
if (!querable(overlayDef)) {
reject(`Layer "${layer}" does not support WFS.`);
return;
}
const bbox = buffer(createOrUpdateFromCoordinate(coordinate), TOLERANCE * resolution);
const params = {
'BBOX': bbox.join(','),
'MAXFEATURES': 1,
'REQUEST': 'GetFeature',
'SERVICE': 'WFS',
'TYPENAME': layer,
'VERSION': '1.0.0',
};
const url = olUriAppendParams(overlayDef.ogcServer.urlWfs, params);
/** @type {?import('ol/Feature.js').default<import('ol/geom/Geometry.js').default>} */
let feature;
fetch(url)
.then((response) =>
response.text().then((responseText) => {
const wfsFormat = new olFormatWFS({
featureNS: overlayDef.ogcServer.namespace,
gmlFormat: new olFormatGML2(),
});
feature = /** @type {import('ol/Feature').default<import('ol/geom/Geometry').default>} */ (wfsFormat.readFeature(
responseText
));
})
)
.catch((response) => {
console.error(`WFS GetFeature request failed, response: ${response}`);
})
.then(() => {
if (!feature) {
throw new Error('Missing feature');
}
resolve(feature);
});
});
});
}