import org.gradle.api.publish.Publication;
import org.gradle.api.publish.PublicationArtifact;
import org.gradle.api.publish.internal.versionmapping.VersionMappingStrategyInternal;

import java.io.File;

public interface PublicationInternal<T extends PublicationArtifact> extends Publication, ProjectComponentPublication {
    ModuleVersionIdentifier getCoordinates();

    ImmutableAttributes getAttributes();

    void setAlias(boolean alias);

/**
 * Builds a {@link ModuleMetadataSpec} from a {@link PublicationInternal} and its {@link SoftwareComponent}.
 *
 * <p>This builder extracts the variants, dependencies, artifacts, etc from the component to build
 * an independent representation of a GMM file that can be published without additional processing.</p>
 */
public class ModuleMetadataSpecBuilder {

    private final PublicationInternal<?> publication;

        for (Publication publication : publications) {
            PublicationInternal<?> publicationInternal = (PublicationInternal<?>) publication;
            dependsOn((Callable<Set<? extends PublicationArtifact>>) () -> {
                return publicationInternal.getPublishableArtifacts().matching(this::isNoSignatureArtifact);
            });
            publicationInternal.allPublishableArtifacts(artifact -> {

import org.gradle.api.internal.tasks.TaskDependencyInternal;
import org.gradle.api.publish.internal.PublicationInternal;

import java.io.File;

import static com.google.common.io.Files.getFileExtension;

public class DerivedMavenArtifact extends AbstractMavenArtifact {
    private final AbstractMavenArtifact original;
    private final PublicationInternal.DerivedArtifact derivedFile;

import org.gradle.api.publish.internal.PublicationInternal;
import org.gradle.api.publish.ivy.IvyArtifact;
import org.gradle.api.tasks.TaskDependency;

import java.io.File;

import static com.google.common.io.Files.getFileExtension;

public class DerivedIvyArtifact extends AbstractIvyArtifact {
    private final IvyArtifact original;
    private final PublicationInternal.DerivedArtifact derived;

    private MavenNormalizedPublication computeNormalizedPublication() {
        MavenPublicationInternal publicationInternal = getPublicationInternal();
        if (publicationInternal == null) {
            throw new InvalidUserDataException("The 'publication' property is required");
        }

        return publicationInternal.asNormalisedPublication();
    }

    @TaskAction
    public void publish() {

import org.gradle.api.Task;
import org.gradle.api.publish.internal.PublicationInternal;
import org.gradle.api.publish.maven.MavenArtifact;
import org.gradle.api.publish.maven.MavenPublication;
import org.gradle.api.publish.maven.internal.publisher.MavenNormalizedPublication;
import org.gradle.api.tasks.TaskProvider;

public interface MavenPublicationInternal extends MavenPublication, PublicationInternal<MavenArtifact> {

    @Override

        // Allow the publication to participate in incremental build
        getInputs().files((Callable<FileCollection>) () -> {
            MavenPublicationInternal publicationInternal = getPublicationInternal();
            return publicationInternal == null ? null : publicationInternal.getPublishableArtifacts().getFiles();
        })
            .withPropertyName("publication.publishableFiles")
            .withPathSensitivity(PathSensitivity.NAME_ONLY);

import org.gradle.api.artifacts.dsl.RepositoryHandler
import org.gradle.api.publish.PublicationContainer
import org.gradle.api.publish.PublishingExtension
import org.gradle.api.publish.internal.PublicationInternal
import org.gradle.test.fixtures.AbstractProjectBuilderSpec

class PublishingPluginTest extends AbstractProjectBuilderSpec {

    PublishingExtension extension

    def setup() {

        // Allow the publication to participate in incremental build
        getInputs().files((Callable<FileCollection>) () -> {
            IvyPublicationInternal publicationInternal = getPublicationInternal();
            return publicationInternal == null ? null : publicationInternal.getPublishableArtifacts().getFiles();
        })
            .withPropertyName("publication.publishableFiles")
            .withPathSensitivity(PathSensitivity.NAME_ONLY);