feat(gradle-plugin): Track the Gradle variant of dependencies

This is a preparation for finding an alternative solution to [1] that
does not require modifying the basic `Identifier` class. Note that the
tracking of variants is only fully implemented for the `gradle-plugin`
as used by the `GradleInspector`; for the "legacy" `Gradle` package
manager the variants are always empty.

[1]: #9817

Signed-off-by: Jendrik Johannes <[email protected]>
Signed-off-by: Sebastian Schuberth <[email protected]>

Author: sschuberth

plugins/package-managers/gradle-model/src/main/kotlin/GradleModel.kt

@@ -43,6 +43,7 @@ interface OrtDependency {
     val version: String
     val classifier: String
     val extension: String
+    val variants: Set<String>
     val dependencies: List<OrtDependency>
     val error: String?
     val warning: String?

plugins/package-managers/gradle-plugin/src/main/kotlin/OrtModelBuilder.kt

@@ -226,6 +226,7 @@ internal class OrtModelBuilder : ToolingModelBuilder {
                                 version = id.version,
                                 classifier = "",
                                 extension = modelBuildingResult?.effectiveModel?.packaging.orEmpty(),
+                                variants = selectedComponent.variants.mapTo(mutableSetOf()) { it.displayName },
                                 dependencies = dependencies,
                                 error = null,
                                 warning = null,
@@ -255,6 +256,7 @@ internal class OrtModelBuilder : ToolingModelBuilder {
                                 version = moduleId.version.takeUnless { it == "unspecified" }.orEmpty(),
                                 classifier = "",
                                 extension = "",
+                                variants = selectedComponent.variants.mapTo(mutableSetOf()) { it.displayName },
                                 dependencies = dependencies,
                                 error = null,
                                 warning = null,

plugins/package-managers/gradle-plugin/src/main/kotlin/OrtModelImpl.kt

@@ -52,6 +52,7 @@ internal class OrtDependencyImpl(
     override val version: String,
     override val classifier: String,
     override val extension: String,
+    override val variants: Set<String>,
     override val dependencies: List<OrtDependency>,
     override val error: String?,
     override val warning: String?,

plugins/package-managers/gradle/src/main/resources/init.gradle

@@ -72,6 +72,7 @@ interface OrtDependency {
     String getVersion()
     String getClassifier()
     String getExtension()
+    Set<String> getVariants()
     List<OrtDependency> getDependencies()
     String getError()
     String getWarning()
@@ -112,6 +113,7 @@ class OrtDependencyImpl implements OrtDependency, Serializable {
     String version = ''
     String classifier = ''
     String extension = ''
+    Set<String> variants = []
     List<OrtDependency> dependencies = []
     String error
     String warning
@@ -382,7 +384,7 @@ class AbstractOrtDependencyTreePlugin<T> implements Plugin<T> {
                     def classifier = artifact?.classifier ?: ''
                     def extension = artifact?.extension ?: ''
 
-                    return new OrtDependencyImpl(id.group, id.module, id.version, classifier, extension, dependencies,
+                    return new OrtDependencyImpl(id.group, id.module, id.version, classifier, extension, [] as Set, dependencies,
                             error, warning, pomFile, null)
                 } else if (id instanceof ProjectComponentIdentifier) {
                     if (id.build.isCurrentBuild() || !project.gradle.gradleVersion.isAtLeastVersion(7, 2)) {