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var extend = require('extend'),
_ = require('lodash');
function addStandardTargetsToAliases(standard, aliases) {
var combined = _.extend({}, aliases);
standard.forEach(function(target) {
if (combined[target] === undefined) {
combined[target] = [target];
}
});
return combined;
}
/*
* Sources
*/
// a list of all sources
var SOURCES = ['openstreetmap', 'openaddresses', 'geonames', 'whosonfirst'];
/*
* A list of alternate names for sources, mostly used to save typing
*/
var SOURCE_ALIASES = {
'osm': ['openstreetmap'],
'oa': ['openaddresses'],
'gn': ['geonames'],
'wof': ['whosonfirst']
};
/*
* Create an object that contains all sources or aliases. The key is the source or alias,
* the value is either that source, or the canonical name for that alias if it's an alias.
*/
var SOURCE_MAPPING = addStandardTargetsToAliases(SOURCES, SOURCE_ALIASES);
/*
* Layers
*/
/*
* A list of all layers in each source. This is used for convenience elswhere
* and to determine when a combination of source and layer parameters is
* not going to match any records and will return no results.
*/
var LAYERS_BY_SOURCE = {
openstreetmap: [ 'address', 'venue' ],
openaddresses: [ 'address' ],
geonames: [ 'country','macroregion', 'region', 'county','localadmin',
'locality', 'neighbourhood', 'venue' ],
whosonfirst: [ 'continent', 'country', 'dependency', 'macroregion', 'region',
'locality', 'localadmin', 'macrocounty', 'county', 'macrohood', 'borough',
'neighbourhood', 'microhood', 'disputed']
};
/*
* A list of layer aliases that can be used to support specific use cases
* (like coarse geocoding) * or work around the fact that different sources
* may have layers that mean the same thing but have a different name
*/
var LAYER_ALIASES = {
'coarse': LAYERS_BY_SOURCE.whosonfirst
};
// create a list of all layers by combining each entry from LAYERS_BY_SOURCE
var LAYERS = _.uniq(Object.keys(LAYERS_BY_SOURCE).reduce(function(acc, key) {
return acc.concat(LAYERS_BY_SOURCE[key]);
}, []));
/*
* Create the an object that has a key for each possible layer or alias,
* and returns either that layer, or all the layers in the alias
*/
var LAYER_MAPPING = addStandardTargetsToAliases(LAYERS, LAYER_ALIASES);
module.exports = {
sources: SOURCES,
layers: LAYERS,
source_mapping: SOURCE_MAPPING,
layer_mapping: LAYER_MAPPING,
layers_by_source: LAYERS_BY_SOURCE
};