@geogirafe/lib-geoportal/tools/drawing/drawingSerializer.js

GeoGirafe is a flexible application to build online geoportals.

import DrawingFeature from './drawingFeature.js';
import DrawingState from './drawingState.js';
export default class DrawingSerializer {
    context;
    constructor(context) {
        this.context = context;
    }
    get state() {
        return this.context.stateManager.state;
    }
    brainSerialize(drawingState) {
        const serializedDrawings = [];
        for (const feature of drawingState.features) {
            serializedDrawings.push(feature.serialize());
        }
        return JSON.stringify(serializedDrawings);
    }
    brainDeserialize(str, stateLocation) {
        const serializedFeatures = JSON.parse(str);
        if (serializedFeatures) {
            let drawingState = new DrawingState();
            if (this.state.extendedState[stateLocation]) {
                // First, delete existing drawing features in the state before adding new ones.
                //  This will trigger removal of the ol features in the map.
                drawingState = this.state.extendedState[stateLocation];
                drawingState.features.splice(0, drawingState.features.length);
            }
            else {
                this.state.extendedState[stateLocation] = drawingState;
            }
            serializedFeatures.forEach((f) => DrawingFeature.deserialize(f, this.context, drawingState));
        }
        else {
            throw new Error(`Cannot deserialize the drawing state for ${stateLocation}`);
        }
    }
}