package org.gradle.internal.resolve.result;

import javax.annotation.Nullable;

public interface ResolveResult {
    /**
     * Returns the resolve failure, if any.
     */
    @Nullable
    Throwable getFailure();

    /**
     * Returns true if the result either has some value, or a failure.
     */
    boolean hasResult();

import org.gradle.tooling.internal.protocol.InternalFailure;

import javax.annotation.Nullable;

public interface InternalBasicProblemDetailsVersion2 extends InternalBasicProblemDetails {

    @Nullable
    InternalFailure getFailure();

                    getFlowProviders().getBuildWorkResult().map(result -> // <5>
                        new File(
                            soundsDir,
                            result.getFailure().isPresent() ? "sad-trombone.mp3" : "tada.mp3"
                        )
                    )
                )
        );
    }
}

 *
 * @since 2.0
 */
public interface UnresolvedComponentResult extends ComponentResult {
    /**
     * Returns the failure that occurred when trying to resolve the component.
     */
    Throwable getFailure();

 *
 * @since 2.0
 */
public interface UnresolvedArtifactResult extends ArtifactResult {
    /**
     * The failure that occurred when the artifact was resolved.
     */
    Throwable getFailure();

    /**
     * Marks the resolution as failed with the given failure.
     */
    void failed(E error);

    /**
     * {@inheritDoc}
     */
    @Nullable
    @Override
    E getFailure();

    Collection<? extends T> getCandidates();

    void select(T candidate);

    void fail(Throwable error);

    @Nullable
    T getSelected();

    @Nullable
    Throwable getFailure();

    boolean hasFailure();

    boolean hasSelected();

    private final Failure failure;

    public DefaultFailureContainer(@Nullable Failure failure) {
        this.failure = failure;
    }

    @Override
    public Failure getFailure() {
        return failure;
    }

    public RepositoryAwareVerificationFailure(VerificationFailure failure, String repositoryName) {
        this.failure = failure;
        this.repositoryName = repositoryName;
    }

    public VerificationFailure getFailure() {
        return failure;
    }

    public String getRepositoryName() {
        return repositoryName;
    }

    @Override
    public String toString() {

     * scheduled work.
     *
     * @return {@link Optional#empty() empty} when no failures occur.
     */
    Optional<Throwable> getFailure();