173 lines
3.9 KiB
JavaScript
173 lines
3.9 KiB
JavaScript
/**
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* @module ol/format/JSONFeature
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*/
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import {inherits} from '../util.js';
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import FeatureFormat from '../format/Feature.js';
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import FormatType from '../format/FormatType.js';
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/**
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* @classdesc
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* Abstract base class; normally only used for creating subclasses and not
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* instantiated in apps.
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* Base class for JSON feature formats.
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*
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* @constructor
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* @abstract
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* @extends {module:ol/format/Feature}
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*/
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const JSONFeature = function() {
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FeatureFormat.call(this);
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};
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inherits(JSONFeature, FeatureFormat);
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/**
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* @param {Document|Node|Object|string} source Source.
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* @return {Object} Object.
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*/
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function getObject(source) {
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if (typeof source === 'string') {
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const object = JSON.parse(source);
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return object ? /** @type {Object} */ (object) : null;
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} else if (source !== null) {
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return source;
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} else {
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return null;
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}
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}
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/**
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* @inheritDoc
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*/
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JSONFeature.prototype.getType = function() {
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return FormatType.JSON;
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};
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/**
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* @inheritDoc
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*/
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JSONFeature.prototype.readFeature = function(source, opt_options) {
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return this.readFeatureFromObject(
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getObject(source), this.getReadOptions(source, opt_options));
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};
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/**
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* @inheritDoc
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*/
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JSONFeature.prototype.readFeatures = function(source, opt_options) {
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return this.readFeaturesFromObject(
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getObject(source), this.getReadOptions(source, opt_options));
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};
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/**
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* @abstract
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* @param {Object} object Object.
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* @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
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* @protected
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* @return {module:ol/Feature} Feature.
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*/
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JSONFeature.prototype.readFeatureFromObject = function(object, opt_options) {};
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/**
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* @abstract
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* @param {Object} object Object.
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* @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
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* @protected
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* @return {Array.<module:ol/Feature>} Features.
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*/
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JSONFeature.prototype.readFeaturesFromObject = function(object, opt_options) {};
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/**
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* @inheritDoc
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*/
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JSONFeature.prototype.readGeometry = function(source, opt_options) {
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return this.readGeometryFromObject(
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getObject(source), this.getReadOptions(source, opt_options));
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};
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/**
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* @abstract
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* @param {Object} object Object.
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* @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
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* @protected
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* @return {module:ol/geom/Geometry} Geometry.
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*/
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JSONFeature.prototype.readGeometryFromObject = function(object, opt_options) {};
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/**
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* @inheritDoc
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*/
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JSONFeature.prototype.readProjection = function(source) {
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return this.readProjectionFromObject(getObject(source));
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};
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/**
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* @abstract
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* @param {Object} object Object.
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* @protected
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* @return {module:ol/proj/Projection} Projection.
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*/
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JSONFeature.prototype.readProjectionFromObject = function(object) {};
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/**
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* @inheritDoc
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*/
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JSONFeature.prototype.writeFeature = function(feature, opt_options) {
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return JSON.stringify(this.writeFeatureObject(feature, opt_options));
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};
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/**
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* @abstract
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* @param {module:ol/Feature} feature Feature.
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* @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
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* @return {Object} Object.
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*/
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JSONFeature.prototype.writeFeatureObject = function(feature, opt_options) {};
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/**
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* @inheritDoc
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*/
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JSONFeature.prototype.writeFeatures = function(features, opt_options) {
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return JSON.stringify(this.writeFeaturesObject(features, opt_options));
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};
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/**
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* @abstract
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* @param {Array.<module:ol/Feature>} features Features.
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* @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
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* @return {Object} Object.
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*/
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JSONFeature.prototype.writeFeaturesObject = function(features, opt_options) {};
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/**
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* @inheritDoc
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*/
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JSONFeature.prototype.writeGeometry = function(geometry, opt_options) {
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return JSON.stringify(this.writeGeometryObject(geometry, opt_options));
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};
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/**
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* @abstract
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* @param {module:ol/geom/Geometry} geometry Geometry.
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* @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
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* @return {Object} Object.
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*/
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JSONFeature.prototype.writeGeometryObject = function(geometry, opt_options) {};
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export default JSONFeature;
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