feat(gradle-plugin): enable lazy configuration

changes:
  - enable lazy evaluation by
    - replacing all Task configurations with gradles Property types
    - using `register` instead of `create` to register the task
  - remove wrongly set task dependencies that can cause circular dependencies. Task dependencies are now inferred by the set classpath. When gradle detects that an output of a task (like compileJava) is used an automatic dependency is formed and `resolve` will always execute compileJava first. The advantage is that this is dynamic. If one does NOT want `compileJava` to be executed it won't be as soon as nothing of compileJava is on the configured classpath

Author: nbrugger-tgm

modules/swagger-gradle-plugin/src/main/java/io/swagger/v3/plugins/gradle/SwaggerPlugin.java

@@ -4,9 +4,10 @@
 import org.gradle.api.Action;
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
-import org.gradle.api.Task;
 import org.gradle.api.artifacts.Configuration;
 import org.gradle.api.artifacts.DependencySet;
+import org.gradle.api.tasks.SourceSetContainer;
+import org.gradle.api.tasks.TaskProvider;
 
 public class SwaggerPlugin implements Plugin<Project> {
     public void apply(Project project) {
@@ -21,24 +22,20 @@ public void execute(DependencySet dependencies) {
                 dependencies.add(project.getDependencies().create("javax.servlet:javax.servlet-api:3.1.0"));
             }
         });
-        Task task = project.getTasks().create("resolve", ResolveTask.class);
-        ((ResolveTask)task).setBuildClasspath(config);
-
-        try {
-            if (project.getTasks().findByPath("classes") != null) {
-                task.dependsOn("classes");
-            }
-            if (project.getTasks().findByPath("compileJava") != null) {
-                task.dependsOn("compileJava");
-            }
-            if (project.getTasks().findByPath("compileTestJava") != null) {
-                task.dependsOn("compileTestJava");
-            }
-            if (project.getTasks().findByPath("testClasses") != null) {
-                task.dependsOn("testClasses");
-            }
-        } catch (Exception e) {
-            project.getLogger().warn("Exception in task dependencies: " + e.getMessage(), e);
-        }
+        TaskProvider<ResolveTask> lazyTask = project.getTasks().register("resolve", ResolveTask.class,task -> {
+            task.buildClasspath.setFrom(config);
+            task.classpath.setFrom(project.getExtensions().findByType(SourceSetContainer.class).getByName("main").getRuntimeClasspath().getFiles());
+            task.prettyPrint.convention(false);
+            task.readAllResources.convention(true);
+            task.outputFormat.convention(ResolveTask.Format.JSON);
+            task.skip.convention(false);
+            task.encoding.convention("UTF-8");
+            task.sortOutput.convention(Boolean.FALSE);
+            task.alwaysResolveAppPath.convention(Boolean.FALSE);
+            task.skipResolveAppPath.convention(Boolean.FALSE);
+            task.openAPI31.convention(false);
+            task.convertToOpenAPI31.convention(false);
+            task.outputDir.convention(project.getLayout().getBuildDirectory().dir("swagger"));
+        });
     }
 }