@angular/fire
Version:
The official Angular library for Firebase.
107 lines • 17.1 kB
JavaScript
import { fromCollectionRef } from '../observable/fromRef';
import { distinctUntilChanged, map, pairwise, scan, startWith } from 'rxjs/operators';
/**
* Return a stream of document changes on a query. These results are not in sort order but in
* order of occurence.
*/
export function docChanges(query, scheduler) {
return fromCollectionRef(query, scheduler)
.pipe(startWith(undefined), pairwise(), map(([priorAction, action]) => {
const docChanges = action.payload.docChanges();
const actions = docChanges.map(change => ({ type: change.type, payload: change }));
// the metadata has changed from the prior emission
if (priorAction && JSON.stringify(priorAction.payload.metadata) !== JSON.stringify(action.payload.metadata)) {
// go through all the docs in payload and figure out which ones changed
action.payload.docs.forEach((currentDoc, currentIndex) => {
const docChange = docChanges.find(d => d.doc.ref.isEqual(currentDoc.ref));
const priorDoc = priorAction === null || priorAction === void 0 ? void 0 : priorAction.payload.docs.find(d => d.ref.isEqual(currentDoc.ref));
if (docChange && JSON.stringify(docChange.doc.metadata) === JSON.stringify(currentDoc.metadata) ||
!docChange && priorDoc && JSON.stringify(priorDoc.metadata) === JSON.stringify(currentDoc.metadata)) {
// document doesn't appear to have changed, don't log another action
}
else {
// since the actions are processed in order just push onto the array
actions.push({
type: 'modified',
payload: {
oldIndex: currentIndex,
newIndex: currentIndex,
type: 'modified',
doc: currentDoc
}
});
}
});
}
return actions;
}));
}
/**
* Return a stream of document changes on a query. These results are in sort order.
*/
export function sortedChanges(query, events, scheduler) {
return docChanges(query, scheduler)
.pipe(scan((current, changes) => combineChanges(current, changes.map(it => it.payload), events), []), distinctUntilChanged(), // cut down on unneed change cycles
map(changes => changes.map(c => ({ type: c.type, payload: c }))));
}
/**
* Combines the total result set from the current set of changes from an incoming set
* of changes.
*/
export function combineChanges(current, changes, events) {
changes.forEach(change => {
// skip unwanted change types
if (events.indexOf(change.type) > -1) {
current = combineChange(current, change);
}
});
return current;
}
/**
* Splice arguments on top of a sliced array, to break top-level ===
* this is useful for change-detection
*/
function sliceAndSplice(original, start, deleteCount, ...args) {
const returnArray = original.slice();
returnArray.splice(start, deleteCount, ...args);
return returnArray;
}
/**
* Creates a new sorted array from a new change.
* Build our own because we allow filtering of action types ('added', 'removed', 'modified') before scanning
* and so we have greater control over change detection (by breaking ===)
*/
export function combineChange(combined, change) {
switch (change.type) {
case 'added':
if (combined[change.newIndex] && combined[change.newIndex].doc.ref.isEqual(change.doc.ref)) {
// Not sure why the duplicates are getting fired
}
else {
return sliceAndSplice(combined, change.newIndex, 0, change);
}
break;
case 'modified':
if (combined[change.oldIndex] == null || combined[change.oldIndex].doc.ref.isEqual(change.doc.ref)) {
// When an item changes position we first remove it
// and then add it's new position
if (change.oldIndex !== change.newIndex) {
const copiedArray = combined.slice();
copiedArray.splice(change.oldIndex, 1);
copiedArray.splice(change.newIndex, 0, change);
return copiedArray;
}
else {
return sliceAndSplice(combined, change.newIndex, 1, change);
}
}
break;
case 'removed':
if (combined[change.oldIndex] && combined[change.oldIndex].doc.ref.isEqual(change.doc.ref)) {
return sliceAndSplice(combined, change.oldIndex, 1);
}
break;
}
return combined;
}
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These results are not in sort order but in\n * order of occurence.\n */\nexport function docChanges<T>(query: Query, scheduler?: SchedulerLike): Observable<DocumentChangeAction<T>[]> {\n  return fromCollectionRef(query, scheduler)\n    .pipe(\n      startWith<Action<QuerySnapshot<firebase.firestore.DocumentData>>, undefined>(undefined),\n      pairwise(),\n      map(([priorAction, action]) => {\n        const docChanges = action.payload.docChanges();\n        const actions = docChanges.map(change => ({ type: change.type, payload: change }));\n        // the metadata has changed from the prior emission\n        if (priorAction && JSON.stringify(priorAction.payload.metadata) !== JSON.stringify(action.payload.metadata)) {\n          // go through all the docs in payload and figure out which ones changed\n          action.payload.docs.forEach((currentDoc, currentIndex) => {\n            const docChange = docChanges.find(d => d.doc.ref.isEqual(currentDoc.ref));\n            const priorDoc = priorAction?.payload.docs.find(d => d.ref.isEqual(currentDoc.ref));\n            if (docChange && JSON.stringify(docChange.doc.metadata) === JSON.stringify(currentDoc.metadata) ||\n              !docChange && priorDoc && JSON.stringify(priorDoc.metadata) === JSON.stringify(currentDoc.metadata)) {\n              // document doesn't appear to have changed, don't log another action\n            } else {\n              // since the actions are processed in order just push onto the array\n              actions.push({\n                type: 'modified',\n                payload: {\n                  oldIndex: currentIndex,\n                  newIndex: currentIndex,\n                  type: 'modified',\n                  doc: currentDoc\n                }\n              });\n            }\n          });\n        }\n        return actions as DocumentChangeAction<T>[];\n      }),\n  );\n}\n\n/**\n * Return a stream of document changes on a query. These results are in sort order.\n */\nexport function sortedChanges<T>(\n  query: Query,\n  events: DocumentChangeType[],\n  scheduler?: SchedulerLike): Observable<DocumentChangeAction<T>[]> {\n  return docChanges<T>(query, scheduler)\n    .pipe(\n      scan((current, changes) => combineChanges<T>(current, changes.map(it => it.payload), events), []),\n      distinctUntilChanged(), // cut down on unneed change cycles\n      map(changes => changes.map(c => ({ type: c.type, payload: c } as DocumentChangeAction<T>))));\n}\n\n/**\n * Combines the total result set from the current set of changes from an incoming set\n * of changes.\n */\nexport function combineChanges<T>(current: DocumentChange<T>[], changes: DocumentChange<T>[], events: DocumentChangeType[]) {\n  changes.forEach(change => {\n    // skip unwanted change types\n    if (events.indexOf(change.type) > -1) {\n      current = combineChange(current, change);\n    }\n  });\n  return current;\n}\n\n/**\n * Splice arguments on top of a sliced array, to break top-level ===\n * this is useful for change-detection\n */\nfunction sliceAndSplice<T>(\n  original: T[],\n  start: number,\n  deleteCount: number,\n  ...args: T[]\n): T[] {\n  const returnArray = original.slice();\n  returnArray.splice(start, deleteCount, ...args);\n  return returnArray;\n}\n\n/**\n * Creates a new sorted array from a new change.\n * Build our own because we allow filtering of action types ('added', 'removed', 'modified') before scanning\n * and so we have greater control over change detection (by breaking ===)\n */\nexport function combineChange<T>(combined: DocumentChange<T>[], change: DocumentChange<T>): DocumentChange<T>[] {\n  switch (change.type) {\n    case 'added':\n      if (combined[change.newIndex] && combined[change.newIndex].doc.ref.isEqual(change.doc.ref)) {\n        // Not sure why the duplicates are getting fired\n      } else {\n        return sliceAndSplice(combined, change.newIndex, 0, change);\n      }\n      break;\n    case 'modified':\n      if (combined[change.oldIndex] == null || combined[change.oldIndex].doc.ref.isEqual(change.doc.ref)) {\n        // When an item changes position we first remove it\n        // and then add it's new position\n        if (change.oldIndex !== change.newIndex) {\n          const copiedArray = combined.slice();\n          copiedArray.splice(change.oldIndex, 1);\n          copiedArray.splice(change.newIndex, 0, change);\n          return copiedArray;\n        } else {\n          return sliceAndSplice(combined, change.newIndex, 1, change);\n        }\n      }\n      break;\n    case 'removed':\n      if (combined[change.oldIndex] && combined[change.oldIndex].doc.ref.isEqual(change.doc.ref)) {\n        return sliceAndSplice(combined, change.oldIndex, 1);\n      }\n      break;\n  }\n  return combined;\n}\n"]}