}

        @Override
        public BuildOperationDescriptor.Builder description() {
            return BuildOperationDescriptor
                .displayName("List " + parent.getUri())
                .details(new ListOperationDetails(parent.getUri()));
        }
    }

        ExternalResourceReadBuildOperationType.Details operationDetails = new ReadOperationDetails(resourceName.getUri());
        return BuildOperationDescriptor
            .displayName("Download " + resourceName.getUri())
            .progressDisplayName(resourceName.getShortDisplayName())
            .details(operationDetails);
    }

import org.gradle.api.provider.Property;
import java.net.URI;
// tag::resource[]

public interface Resource {
    // Type must have a read-only 'name' property
    String getName();

    Property<URI> getUri();

    Property<String> getUserName();
}

        then:
        List<BuildOperationDescriptor> descriptors = buildOperationRunner.log.getDescriptors()
        descriptors.find { it.name == "Examining toolchain URI " + DOWNLOAD.getUri() }
        descriptors.find { it.name == "Downloading toolchain from URI " + DOWNLOAD.getUri() }
        descriptors.find { it.name == "Unpacking toolchain archive " + ARCHIVE_NAME }
    }

    def "skips downloading if already downloaded"() {

        STATS.resource(location.getUri());
        return accessor.withContent(location, revalidate, action);
    }

    @Nullable
    @Override
    public ExternalResourceMetaData getMetaData(ExternalResourceName location, boolean revalidate) {
        STATS.metadata(location.getUri());
        return accessor.getMetaData(location, revalidate);
    }

    @Nullable

            parseMavenMetadataInfo(metadataLocation, metadata);
        } catch (MissingResourceException e) {
            throw e;
        } catch (Exception e) {
            throw new ResourceException(metadataLocation.getUri(), String.format("Unable to load Maven meta-data from %s.", metadataLocation), e);
        }
        return metadata;
    }

import org.gradle.api.provider.Property;
import java.net.URI;
// tag::resource[]

public interface Resource {
    Property<URI> getUri();
}

        this.artifactFilePattern = artifactFilePattern ?: "[artifact]-[revision](-[classifier])(.[ext])"
    }

    URI getUri() {
        return rootDir.toURI()
    }

    private String getUriWithoutTrailingSlash() {
        String uri = getUri().toASCIIString()
        if (uri.endsWith('/')) {
            uri = uri.substring(0, uri.length() - 1)
        }
        return uri
    }

import org.gradle.api.provider.Property;
import java.net.URI;
// tag::resource[]

public interface Resource {
    // Type must have a read-only 'name' property
    String getName();

    Property<URI> getUri();

    Property<String> getUserName();
}

                List<ComponentVariant.File> invalidFiles = null;
                for (ComponentVariant.File file : mutableVariant.getFiles()) {
                    if (file.getUri().contains("SNAPSHOT")) {
                        if (invalidFiles == null) {
                            invalidFiles = Lists.newArrayListWithExpectedSize(2);
                        }