note cache breakup into classes, WIP

src/services/note_cache/expressions/exists.js

@@ -0,0 +1,27 @@
+export default class ExistsExp {
+    constructor(attributeType, attributeName) {
+        this.attributeType = attributeType;
+        this.attributeName = attributeName;
+    }
+
+    execute(noteSet) {
+        const attrs = findAttributes(this.attributeType, this.attributeName);
+        const resultNoteSet = new NoteSet();
+
+        for (const attr of attrs) {
+            const note = attr.note;
+
+            if (noteSet.hasNoteId(note.noteId)) {
+                if (attr.isInheritable) {
+                    resultNoteSet.addAll(note.subtreeNotesIncludingTemplated);
+                }
+                else if (note.isTemplate) {
+                    resultNoteSet.addAll(note.templatedNotes);
+                }
+                else {
+                    resultNoteSet.add(note);
+                }
+            }
+        }
+    }
+}