55946: Refactored item-select to object-select to allow for easier implementation of collection-select

src/app/shared/object-select/object-select.reducer.ts

@@ -0,0 +1,84 @@
+import { isEmpty } from '../empty.util';
+import { ObjectSelectionAction, ObjectSelectionActionTypes } from './object-select.actions';
+
+/**
+ * Interface that represents the state for a single filters
+ */
+export interface ObjectSelectionState {
+  checked: boolean;
+}
+
+/**
+ * Interface that represents the state for all available filters
+ */
+export interface ObjectSelectionsState {
+  [id: string]: ObjectSelectionState
+}
+
+const initialState: ObjectSelectionsState = Object.create(null);
+
+/**
+ * Performs a search filter action on the current state
+ * @param {SearchFiltersState} state The state before the action is performed
+ * @param {SearchFilterAction} action The action that should be performed
+ * @returns {SearchFiltersState} The state after the action is performed
+ */
+export function objectSelectionReducer(state = initialState, action: ObjectSelectionAction): ObjectSelectionsState {
+
+  switch (action.type) {
+
+    case ObjectSelectionActionTypes.INITIAL_SELECT: {
+      if (isEmpty(state) || isEmpty(state[action.id])) {
+        return Object.assign({}, state, {
+          [action.id]: {
+            checked: true
+          }
+        });
+      }
+      return state;
+    }
+
+    case ObjectSelectionActionTypes.INITIAL_DESELECT: {
+      if (isEmpty(state) || isEmpty(state[action.id])) {
+        return Object.assign({}, state, {
+          [action.id]: {
+            checked: false
+          }
+        });
+      }
+      return state;
+    }
+
+    case ObjectSelectionActionTypes.SELECT: {
+      return Object.assign({}, state, {
+        [action.id]: {
+          checked: true
+        }
+      });
+    }
+
+    case ObjectSelectionActionTypes.DESELECT: {
+      return Object.assign({}, state, {
+        [action.id]: {
+          checked: false
+        }
+      });
+    }
+
+    case ObjectSelectionActionTypes.SWITCH: {
+      return Object.assign({}, state, {
+        [action.id]: {
+          checked: (isEmpty(state) || isEmpty(state[action.id])) ? true : !state[action.id].checked
+        }
+      });
+    }
+
+    case ObjectSelectionActionTypes.RESET: {
+      return {};
+    }
+
+    default: {
+      return state;
+    }
+  }
+}