WIP build up displaysets.

extensions/default/src/DicomWebDataSource/wado/retrieveMetadataLoaderSync.js

@@ -0,0 +1,66 @@
+import { api } from 'dicomweb-client';
+import DICOMWeb from '../../../DICOMWeb/';
+import { createStudyFromSOPInstanceList } from './studyInstanceHelpers';
+import RetrieveMetadataLoader from './retrieveMetadataLoader';
+
+/**
+ * Class for sync load of study metadata.
+ * It inherits from RetrieveMetadataLoader
+ *
+ * A list of loaders (getLoaders) can be created so, it will be applied a fallback load strategy.
+ * I.e Retrieve metadata using all loaders possibilities.
+ */
+export default class RetrieveMetadataLoaderSync extends RetrieveMetadataLoader {
+  getOptions() {
+    const { studyInstanceUID, filters } = this;
+
+    const options = {
+      studyInstanceUID,
+    };
+
+    const { seriesInstanceUID } = filters;
+    if (seriesInstanceUID) {
+      options['seriesInstanceUID'] = seriesInstanceUID;
+    }
+
+    return options;
+  }
+
+  /**
+   * @returns {Array} Array of loaders. To be consumed as queue
+   */
+  *getLoaders() {
+    const loaders = [];
+    const {
+      studyInstanceUID,
+      filters: { seriesInstanceUID } = {},
+      client,
+    } = this;
+
+    if (seriesInstanceUID) {
+      loaders.push(
+        client.retrieveSeriesMetadata.bind(client, {
+          studyInstanceUID,
+          seriesInstanceUID,
+        })
+      );
+    }
+
+    loaders.push(
+      client.retrieveStudyMetadata.bind(client, { studyInstanceUID })
+    );
+
+    yield* loaders;
+  }
+
+  async load(preLoadData) {
+    const loaders = this.getLoaders();
+    const result = this.runLoaders(loaders);
+    return result;
+  }
+
+  async posLoad(loadData) {
+    const { server } = this;
+    return createStudyFromSOPInstanceList(server, loadData);
+  }
+}