not.ts
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not.ts
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	import Policy from "../../chip-types/policy";
	import * as Query from "../../datastore/query";
	import type { CollectionItem, Context } from "../../main";

	export default class Not extends Policy {
	static type_name = "not";
	strategy_to_negate: Policy;
	constructor(strategy: Policy) {
	super(strategy);
	this.strategy_to_negate = Policy.fromDefinition(strategy);
	}

	async _getRestrictingQuery(context: Context) {
	//assuming "not" can take only one access strategy as a parameter
	const query = await this.strategy_to_negate.getRestrictingQuery(
	context
	);
	return new Query.Not(query);
	}
	async isItemSensitive(context: Context) {
	return this.strategy_to_negate.isItemSensitive(context);
	}
	async checkerFunction(
	context: Context,
	item_getter: () => Promise<CollectionItem>
	) {
	const result = await this.strategy_to_negate.check(
	context,
	item_getter
	);
	if (result === null) {
	return null;
	}
	if (result.allowed) {
	return Policy.deny(
	context.app.i18n("policy_not_allow", [result.reason])
	);
	}
	return Policy.allow(`it's not true that "${result.reason}"`);
	}
	}