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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | 1x 156x 506x 25x 156x 139x 626x 139x 139x 6x 11x 3247x 14566x 14566x 2736x | // This module defines a way to access various metadata about an imageId. This layer of abstraction exists
// So metadata can be provided in different ways (e.g. by parsing DICOM P10 or by a WADO-RS document)
const providers = [];
/**
* Adds a metadata provider with the specified priority
* @param provider - Metadata provider function
* @param priority - 0 is default/normal, > 0 is high, < 0 is low
*
* @category MetaData
*/
export function addProvider(
provider: (type: string, ...query: string[]) => any,
priority = 0
): void {
let i;
// Find the right spot to insert this provider based on priority
for (i = 0; i < providers.length; i++) {
if (providers[i].priority <= priority) {
break;
}
}
// Insert the decode task at position i
providers.splice(i, 0, {
priority,
provider,
});
}
/**
* Removes the specified provider
*
* @param provider - Metadata provider function
*
* @category MetaData
*/
export function removeProvider(
provider: (type: string, query: any) => { any }
): void {
for (let i = 0; i < providers.length; i++) {
if (providers[i].provider === provider) {
providers.splice(i, 1);
break;
}
}
}
/**
* Removes all providers
*
* @category MetaData
*/
export function removeAllProviders(): void {
while (providers.length > 0) {
providers.pop();
}
}
/**
* Gets metadata from the registered metadata providers. Will call each one from highest priority to lowest
* until one responds
*
* @param type - The type of metadata requested from the metadata store
* @param query - The query for the metadata store, often imageId
* Some metadata providers support multi-valued strings, which are interpretted
* as the provider chooses.
*
* @returns The metadata retrieved from the metadata store
* @category MetaData
*/
function getMetaData(type: string, ...queries): any {
// Invoke each provider in priority order until one returns something
for (let i = 0; i < providers.length; i++) {
const result = providers[i].provider(type, ...queries);
if (result !== undefined) {
return result;
}
}
}
export { getMetaData as get };
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