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"use strict";
/**
* Helpers for filtering the index specifications returned by DBCollection.prototype.getIndexes().
*/
var GetIndexHelpers = (function() {
/**
* Returns the index specification with the name 'indexName' if it is present in the
* 'indexSpecs' array, and returns null otherwise.
*/
function getIndexSpecByName(indexSpecs, indexName) {
if (typeof indexName !== "string") {
throw new Error("'indexName' parameter must be a string, but got " + tojson(indexName));
}
const found = indexSpecs.filter(spec => spec.name === indexName);
if (found.length > 1) {
throw new Error("Found multiple indexes with name '" + indexName + "': " +
tojson(indexSpecs));
}
return (found.length === 1) ? found[0] : null;
}
/**
* Returns the index specification with the key pattern 'keyPattern' and the collation
* 'collation' if it is present in the 'indexSpecs' array, and returns null otherwise.
*
* The 'collation' parameter is optional and is only required to be specified when multiple
* indexes with the same key pattern exist.
*/
function getIndexSpecByKeyPattern(indexSpecs, keyPattern, collation) {
const collationWasSpecified = arguments.length >= 3;
const foundByKeyPattern = indexSpecs.filter(spec => {
return bsonWoCompare(spec.key, keyPattern) === 0;
});
if (!collationWasSpecified) {
if (foundByKeyPattern.length > 1) {
throw new Error("Found multiple indexes with key pattern " + tojson(keyPattern) +
" and 'collation' parameter was not specified: " +
tojson(indexSpecs));
}
return (foundByKeyPattern.length === 1) ? foundByKeyPattern[0] : null;
}
const foundByKeyPatternAndCollation = foundByKeyPattern.filter(spec => {
if (collation.locale === "simple") {
// The simple collation is not explicitly stored in the index catalog, so we expect
// the "collation" field to be absent.
return !spec.hasOwnProperty("collation");
}
return bsonWoCompare(spec.collation, collation) === 0;
});
if (foundByKeyPatternAndCollation.length > 1) {
throw new Error("Found multiple indexes with key pattern" + tojson(keyPattern) +
" and collation " + tojson(collation) + ": " + tojson(indexSpecs));
}
return (foundByKeyPatternAndCollation.length === 1) ? foundByKeyPatternAndCollation[0]
: null;
}
return {
findByName: getIndexSpecByName,
findByKeyPattern: getIndexSpecByKeyPattern,
};
})();
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