Initial work on Nucleus parity merge

Packages/ohif-viewerbase/client/lib/StackManager.js

@@ -0,0 +1,124 @@
+import { OHIF } from 'meteor/ohif:core';
+import { getImageId } from './getImageId';
+import { addMetaData } from './metaDataProvider';
+import { OHIFError } from './classes/OHIFError';
+
+let stackMap = {};
+let configuration = {};
+const stackUpdatedCallbacks = [];
+
+/**
+ * Loop through the current series and add metadata to the
+ * Cornerstone meta data provider. This will be used to fill information
+ * into the viewport overlays, and to calculate reference lines and orientation markers
+ * @param  {Object} stackMap              stackMap object
+ * @param  {Object} study                 Study object
+ * @param  {Object} displaySet            The set of images to make the stack from
+ * @return {Array}                        Array with image IDs
+ */
+function createAndAddStack(stackMap, study, displaySet) {
+  const numImages = displaySet.images.length;
+  const imageIds = [];
+  let imageId;
+
+  displaySet.images.forEach((image, imageIndex) => {
+      const metaData = {
+          instance: image,
+          series: displaySet, // TODO: Check this
+          study: study,
+          numImages: numImages,
+          imageIndex: imageIndex + 1
+      };
+
+      const numFrames = image.numFrames;
+      if (numFrames > 1) {
+          OHIF.log.info('Multiframe image detected');
+          for (let i = 0; i < numFrames; i++) {
+              metaData.frame = i;
+              imageId = getImageId(image, i);
+              imageIds.push(imageId);
+              addMetaData(imageId, metaData);
+          }
+      } 
+      else {
+          imageId = getImageId(image);
+          imageIds.push(imageId);
+          addMetaData(imageId, metaData);
+      }
+  });
+
+  return imageIds;
+}
+
+configuration = {
+  createAndAddStack: createAndAddStack
+};
+
+/**
+ * This object contains all the functions needed for interacting with the stack manager.
+ * Generally, findStack is the only function used. If you want to know when new stacks
+ * come in, you can register a callback with addStackUpdatedCallback.
+ * clearStacks and makeAndAddStack should not used outside of loadStudy and removeStudies.
+ */
+const StackManager = {
+  /**
+   * Removes all current stacks
+   */
+  clearStacks() {
+    stackMap = {};
+  },
+  /**
+   * Create a stack from an image set, as well as add in the metadata on a per image bases.
+   * @param study The study who's metadata will be added
+   * @param displaySet The set of images to make the stack from
+   * @return {Array} Array with image IDs
+   */
+  makeAndAddStack(study, displaySet) {
+    return configuration.createAndAddStack(stackMap, study, displaySet, stackUpdatedCallbacks);
+  },
+  /**
+   * Find a stack from the currently created stacks.
+   * @param displaySetInstanceUid The UID of the stack to find.
+   * @returns {*} undefined if not found, otherwise the stack object is returned.
+   */
+  findStack(displaySetInstanceUid) {
+    return stackMap[displaySetInstanceUid];
+  },
+  /**
+   * Gets the underlying map of displaySetInstanceUid to stack object.
+   * WARNING: Do not change this object. It directly affects the manager.
+   * @returns {{}} map of displaySetInstanceUid -> stack.
+   */
+  getAllStacks() {
+    return stackMap;
+  },
+  /**
+   * Adds in a callback to be called on a stack being added / updated.
+   * @param callback must accept at minimum one argument,
+   * which is the stack that was added / updated.
+   */
+  addStackUpdatedCallback(callback) {
+    if (typeof callback !== 'function') {
+      throw new OHIFError('callback must be provided as a function');
+    }
+    stackUpdatedCallbacks.push(callback);
+  },
+  /**
+   * Return configuration
+   */
+  getConfiguration() {
+    return configuration;
+  },
+  /**
+   * Set configuration, in order to provide compatibility
+   * with other systems by overriding this functions
+   * @param {Object} config object with functions to be overrided
+   *
+   * For now, only makeAndAddStack can be overrided
+   */
+  setConfiguration(config) {
+    configuration = config;
+  }
+};
+
+export { StackManager };