server/protocols/jmap-draft/src/main/java/org/apache/james/jmap/draft/utils/quotas/QuotaLoaderWithDefaultPreloaded.java

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package org.apache.james.jmap.draft.utils.quotas;

import java.util.Optional;

import org.apache.james.jmap.draft.model.mailbox.Quotas;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.mailbox.model.MailboxPath;
import org.apache.james.mailbox.quota.QuotaManager;
import org.apache.james.mailbox.quota.QuotaRootResolver;

import reactor.core.publisher.Mono;

public class QuotaLoaderWithDefaultPreloaded extends QuotaLoader {

    public static Mono<QuotaLoaderWithDefaultPreloaded> preLoad(QuotaRootResolver quotaRootResolver,
                                            QuotaManager quotaManager,
                                            MailboxSession session) {
        DefaultQuotaLoader defaultQuotaLoader = new DefaultQuotaLoader(quotaRootResolver, quotaManager);

        return defaultQuotaLoader.getQuotas(MailboxPath.inbox(session))
            .map(Optional::of)
            .switchIfEmpty(Mono.just(Optional.empty()))
            .map(quotas -> new QuotaLoaderWithDefaultPreloaded(quotaRootResolver, defaultQuotaLoader, quotas));
    }

    private final QuotaRootResolver quotaRootResolver;
    private final DefaultQuotaLoader defaultQuotaLoader;
    private final Optional<Quotas> preloadedUserDefaultQuotas;

    private QuotaLoaderWithDefaultPreloaded(QuotaRootResolver quotaRootResolver, DefaultQuotaLoader defaultQuotaLoader, Optional<Quotas> preloadedUserDefaultQuotas) {
        this.quotaRootResolver = quotaRootResolver;
        this.defaultQuotaLoader = defaultQuotaLoader;
        this.preloadedUserDefaultQuotas = preloadedUserDefaultQuotas;
    }

    public Mono<Quotas> getQuotas(MailboxPath mailboxPath) {
        return Mono.from(quotaRootResolver.getQuotaRootReactive(mailboxPath))
            .flatMap(quotaRoot -> {
                Quotas.QuotaId quotaId = Quotas.QuotaId.fromQuotaRoot(quotaRoot);
                if (containsQuotaId(preloadedUserDefaultQuotas, quotaId)) {
                    return Mono.just(preloadedUserDefaultQuotas.get());
                }
                return defaultQuotaLoader.getQuotas(mailboxPath);
            });
    }

    private boolean containsQuotaId(Optional<Quotas> preloadedUserDefaultQuotas, Quotas.QuotaId quotaId) {
        return preloadedUserDefaultQuotas
            .map(Quotas::getQuotas)
            .map(quotaIdQuotaMap -> quotaIdQuotaMap.containsKey(quotaId))
            .orElse(false);
    }

}