@wroud/preconditions/lib/PreconditionManager.js

A flexible and extensible library for managing preconditions in JavaScript and TypeScript applications. Simplify validation and preparation of entities like nodes, connections, and features with dynamic precondition handling.

export class PreconditionManager {
    preconditions = [];
    /**
     * Registers a new precondition for this entity type.
     * @param precondition - The precondition to register.
     */
    register(...precondition) {
        this.preconditions.push(...precondition);
    }
    /**
     * Checks if all applicable preconditions are fulfilled for the given entity instance.
     * @param entity - The entity instance.
     * @return {Promise<boolean>} - Resolves to true if all applicable preconditions are fulfilled.
     */
    async checkPreconditions(entity) {
        for (const precondition of this.getApplicablePreconditions(entity)) {
            const isFulfilled = await precondition.check(entity);
            if (!isFulfilled) {
                return false;
            }
        }
        return true;
    }
    /**
     * Attempts to fulfill all applicable preconditions for the given entity instance.
     * @param entity - The entity instance.
     * @return {Promise<void>}
     */
    async fulfillPreconditions(entity) {
        for (const precondition of this.getApplicablePreconditions(entity)) {
            const isFulfilled = await precondition.check(entity);
            if (!isFulfilled) {
                await precondition.fulfill(entity);
            }
        }
    }
    *getApplicablePreconditions(entity) {
        for (const precondition of this.preconditions) {
            if (precondition.isApplicable(entity)) {
                yield precondition;
            }
        }
    }
}
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