/
vectorsource.js
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/
vectorsource.js
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goog.provide('ol.source.Vector');
goog.require('ol.Attribution');
goog.require('ol.Extent');
goog.require('ol.Feature');
goog.require('ol.Projection');
goog.require('ol.filter.Extent');
goog.require('ol.filter.Filter');
goog.require('ol.filter.Geometry');
goog.require('ol.filter.Logical');
goog.require('ol.geom.GeometryType');
goog.require('ol.source.TileSource');
goog.require('ol.structs.RTree');
goog.require('ol.tilegrid.TileGrid');
/**
* @constructor
*/
ol.source.FeatureCache = function() {
/**
* @type {Object.<string, ol.Feature>}
* @private
*/
this.idLookup_;
/**
* @type {Object.<string, ol.Feature>}
* @private
*/
this.geometryTypeIndex_;
/**
* @type {Object.<ol.geom.GeometryType, ol.structs.RTree>}
* @private
*/
this.boundsByGeometryType_;
this.clear();
};
/**
* Clear the cache.
*/
ol.source.FeatureCache.prototype.clear = function() {
this.idLookup_ = {};
var geometryTypeIndex = {},
boundsByGeometryType = {},
geometryType;
for (var key in ol.geom.GeometryType) {
geometryType = ol.geom.GeometryType[key];
geometryTypeIndex[geometryType] = {};
boundsByGeometryType[geometryType] = new ol.structs.RTree();
}
this.geometryTypeIndex_ = geometryTypeIndex;
this.boundsByGeometryType_ = boundsByGeometryType;
};
/**
* Add a feature to the cache.
* @param {ol.Feature} feature Feature to be cached.
*/
ol.source.FeatureCache.prototype.add = function(feature) {
var id = goog.getUid(feature).toString(),
geometry = feature.getGeometry();
this.idLookup_[id] = feature;
// index by geometry type and bounding box
if (!goog.isNull(geometry)) {
var geometryType = geometry.getType();
this.geometryTypeIndex_[geometryType][id] = feature;
this.boundsByGeometryType_[geometryType].put(geometry.getBounds(),
feature);
}
};
/**
* @param {ol.filter.Filter=} opt_filter Optional filter.
* @return {Object.<string, ol.Feature>} Object of features, keyed by id.
* @private
*/
ol.source.FeatureCache.prototype.getFeaturesObject_ = function(opt_filter) {
var i, features;
if (!goog.isDef(opt_filter)) {
features = this.idLookup_;
} else {
if (opt_filter instanceof ol.filter.Geometry) {
features = this.geometryTypeIndex_[opt_filter.getType()];
} else if (opt_filter instanceof ol.filter.Extent) {
var boundsByGeometryType = this.boundsByGeometryType_,
extent = opt_filter.getExtent();
features = {};
for (i in boundsByGeometryType) {
goog.object.extend(features, boundsByGeometryType[i].find(extent));
}
} else if (opt_filter instanceof ol.filter.Logical) {
var filters = opt_filter.getFilters();
if (filters.length === 2) {
var filter, geometryFilter, extentFilter;
for (i = 0; i <= 1; ++i) {
filter = filters[i];
if (filter instanceof ol.filter.Geometry) {
geometryFilter = filter;
} else if (filter instanceof ol.filter.Extent) {
extentFilter = filter;
}
}
if (extentFilter && geometryFilter) {
features = this.boundsByGeometryType_[geometryFilter.getType()]
.find(extentFilter.getExtent());
}
}
}
if (!goog.isDef(features)) {
// TODO: support fast lane for other filter types
var candidates = this.idLookup_,
feature;
features = {};
for (i in candidates) {
feature = candidates[i];
if (opt_filter.evaluate(feature) === true) {
features[i] = feature;
}
}
}
}
return features;
};
/**
* @param {ol.filter.Filter=} opt_filter Optional filter.
* @return {Array.<ol.Feature>} Array of features.
*/
ol.source.FeatureCache.prototype.getFeatures = function(opt_filter) {
return goog.object.getValues(this.getFeaturesObject_(opt_filter));
};
/**
* @param {ol.filter.Geometry} filter Geometry type filter.
* @return {Array.<ol.Feature>} Array of features.
* @private
*/
ol.source.FeatureCache.prototype.getFeaturesByGeometryType_ = function(filter) {
return goog.object.getValues(this.geometryTypeIndex_[filter.getType()]);
};
/**
* Get features by ids.
* @param {Array.<string>} ids Array of (internal) identifiers.
* @return {Array.<ol.Feature>} Array of features.
* @private
*/
ol.source.FeatureCache.prototype.getFeaturesByIds_ = function(ids) {
var len = ids.length,
features = new Array(len),
i;
for (i = 0; i < len; ++i) {
features[i] = this.idLookup_[ids[i]];
}
return features;
};
/**
* @typedef {{attributions: (Array.<ol.Attribution>|undefined),
* extent: (ol.Extent|undefined),
* projection: (ol.Projection|undefined),
* tileGrid: (ol.tilegrid.TileGrid|undefined)}}
*/
ol.source.VectorOptions;
/**
* @constructor
* @extends {ol.source.TileSource}
* @param {ol.source.VectorOptions} options Source options.
*/
ol.source.Vector = function(options) {
goog.base(this, {
attributions: options.attributions,
extent: options.extent,
projection: options.projection,
tileGrid: options.tileGrid
});
/**
* @type {ol.source.FeatureCache}
* @private
*/
this.featureCache_ = new ol.source.FeatureCache();
};
goog.inherits(ol.source.Vector, ol.source.TileSource);
/**
* @param {ol.tilegrid.TileGrid} tileGrid tile grid.
*/
ol.source.Vector.prototype.setTileGrid = function(tileGrid) {
this.tileGrid = tileGrid;
};
/**
* @param {Array.<ol.Feature>} features Array of features.
*/
ol.source.Vector.prototype.addFeatures = function(features) {
for (var i = 0, ii = features.length; i < ii; ++i) {
this.featureCache_.add(features[i]);
}
};
/**
* @param {ol.filter.Filter=} opt_filter Optional filter.
* @return {Array.<ol.Feature>} Array of features.
*/
ol.source.Vector.prototype.getFeatures = function(opt_filter) {
return this.featureCache_.getFeatures(opt_filter);
};