feat(dicomJSON): Add Loading Other Display Sets and JSON Metadata Generation script (#3777)

platform/core/src/utils/addAccessors.js

@@ -0,0 +1,66 @@
+const handler = {
+  /**
+   * Get a proxied value from the array or property value
+   * Note that the property value get works even if you update the underlying object.
+   * Also, return true of proxy.__isProxy in order to distinguish proxies and not double proxy them.
+   */
+  get: (target, prop) => {
+    if (prop == '__isProxy') {
+      return true;
+    }
+    if (prop in target) {
+      return target[prop];
+    }
+    return target[0][prop];
+  },
+
+  set: (obj, prop, value) => {
+    if (typeof prop === 'number' || prop in obj) {
+      obj[prop] = value;
+    } else {
+      obj[0][prop] = value;
+    }
+    return true;
+  },
+};
+
+/**
+ * Add a proxy object for sqZero or the src[0] element if sqZero is unspecified, AND
+ * src is an array of length 1.
+ *
+ * If sqZero isn't passed in, then assume this is a create call on the destination object
+ * itself, by:
+ * 1. If not an object, return dest
+ * 2. If an array of length != 1, return dest
+ * 3. If an array, use dest[0] as sqZero
+ * 4. Use dest as sqZero
+ *
+ * @example
+ * src = [{a:5,b:'string', c:null}]
+ * addAccessors(src)
+ * src.c = 'outerChange'
+ * src[0].b='innerChange'
+ *
+ * assert src.a===5
+ * assert src[0].c === 'outerChange'
+ * assert src.b === 'innerChange'
+ */
+const addAccessors = (dest, sqZero) => {
+  if (dest.__isProxy) {
+    return dest;
+  }
+  let itemZero = sqZero;
+  if (itemZero === undefined) {
+    if (typeof dest !== 'object') {
+      return dest;
+    }
+    if (Array.isArray(dest) && dest.length !== 1) {
+      return dest;
+    }
+    itemZero = Array.isArray(dest) ? dest[0] : dest;
+  }
+  const ret = [itemZero];
+  return new Proxy(ret, handler);
+};
+
+export default addAccessors;

platform/core/src/utils/index.js

@@ -27,6 +27,7 @@ import debounce from './debounce';
 import roundNumber from './roundNumber';
 import downloadCSVReport from './downloadCSVReport';
 import isEqualWithin from './isEqualWithin';
+import addAccessors from './addAccessors';
 import {
   sortStudy,
   sortStudySeries,
@@ -65,6 +66,7 @@ const utils = {
   Queue,
   isDicomUid,
   isEqualWithin,
+  addAccessors,
   resolveObjectPath,
   hierarchicalListUtils,
   progressTrackingUtils,

platform/core/src/utils/index.test.js

@@ -40,6 +40,7 @@ describe('Top level exports', () => {
       'progressTrackingUtils',
       'subscribeToNextViewportGridChange',
       'uuidv4',
+      'addAccessors',
     ].sort();
 
     const exports = Object.keys(utils.default).sort();