Support getting Git Parameter choices via extra call

src/main/java/org/codinjutsu/tools/jenkins/logic/JenkinsJsonParser.java

@@ -468,6 +468,19 @@ public String getServerUrl(String serverData) {
         return getServerUrl(parseJson(serverData));
     }
 
+    @Override
+    public List<String> getFillValueItems(String fillValueItemsData) {
+        checkJsonDataAndThrowExceptionIfNecessary(fillValueItemsData);
+        JsonObject fillValueJson = parseJson(fillValueItemsData);
+        JsonArray fillValueArray = (JsonArray) fillValueJson.get("values");
+        List<String> values = new ArrayList<>();
+        for (Object obj : fillValueArray) {
+           JsonObject valueJson = (JsonObject) obj;
+           values.add(valueJson.getString(createJsonKey("value")));
+        }
+        return values;
+    }
+
     @NotNull
     private String getServerUrl(JsonObject jsonObject) {
         final Optional<View> primaryView = Optional.ofNullable((JsonObject) jsonObject.get(PRIMARY_VIEW)).map(this::getView);

src/main/java/org/codinjutsu/tools/jenkins/logic/JenkinsParser.java

@@ -91,4 +91,6 @@ public interface JenkinsParser {
 
     @NotNull
     String getServerUrl(String serverData);
+
+    List<String> getFillValueItems(String fillValueItemsData);
 }

src/main/java/org/codinjutsu/tools/jenkins/logic/RequestManager.java

@@ -486,6 +486,12 @@ public List<Computer> loadComputer(JenkinsAppSettings settings) {
         return jsonParser.createComputers(securityClient.execute(url));
     }
 
+    @Override
+    public List<String> getGitParameterChoices(Job job, JobParameter jobParameter) {
+        final URL url = urlBuilder.createFillValueItemsUrl(job.getUrl(), jobParameter.getJobParameterType().getClassName(), jobParameter.getName());
+        return jsonParser.getFillValueItems(securityClient.execute(url));
+    }
+
     @NotNull
     private HttpClientBuilder createHttpClientBuilder(String serverUrl, JenkinsSettings jenkinsSettings) {
         final CredentialsProvider provider = new BasicCredentialsProvider();

src/main/java/org/codinjutsu/tools/jenkins/logic/RequestManagerInterface.java

@@ -45,4 +45,6 @@ public interface RequestManagerInterface {
 
     @NotNull
     List<Computer> loadComputer(JenkinsAppSettings settings);
+
+    List<String> getGitParameterChoices(Job job, JobParameter jobParameter);
 }

src/main/java/org/codinjutsu/tools/jenkins/logic/UrlBuilder.java

@@ -46,6 +46,7 @@ public class UrlBuilder {
     private static final String NESTED_JOBS_INFO =  URL + "name,displayName,fullDisplayName,jobs[" + BASIC_JOB_INFO + "]";
     private static final String COMPUTER = "/computer";
     private static final String COMPUTER_INFO = "computer[displayName,description,offline,assignedLabels[name]]";
+    private static final String FILL_VALUE_ITEMS = "descriptorByName/%s/fillValueItems?param=%s";
 
     public static UrlBuilder getInstance(Project project) {
         return Optional.ofNullable(project.getService(UrlBuilder.class))
@@ -212,4 +213,13 @@ public String removeTrailingSlash(@NotNull String url) {
         }
         return withoutTrailingSlash;
     }
+
+    public URL createFillValueItemsUrl(String jobUrl, String className, String param) {
+        try {
+            return new URL(jobUrl + String.format(FILL_VALUE_ITEMS, className, param));
+        } catch (Exception ex) {
+            handleException(ex);
+        }
+        return null;
+    }
 }

src/main/java/org/codinjutsu/tools/jenkins/view/BuildParamDialog.java

@@ -33,6 +33,7 @@
 import org.codinjutsu.tools.jenkins.model.JobParameter;
 import org.codinjutsu.tools.jenkins.view.extension.JobParameterRenderer;
 import org.codinjutsu.tools.jenkins.view.extension.JobParameterRenderers;
+import org.codinjutsu.tools.jenkins.view.parameter.GitParameterRenderer;
 import org.codinjutsu.tools.jenkins.view.parameter.JobParameterComponent;
 import org.codinjutsu.tools.jenkins.view.util.SpringUtilities;
 import org.jetbrains.annotations.NotNull;
@@ -117,7 +118,20 @@ private void addParameterInputs() {
         for (JobParameter jobParameter : parameters) {
             final JobParameterRenderer jobParameterRenderer = JobParameterRenderer.findRenderer(jobParameter)
                     .orElseGet(ErrorRenderer::new);
-            final JobParameterComponent<?> jobParameterComponent = jobParameterRenderer.render(jobParameter);
+            JobParameterComponent<?> jobParameterComponent;
+            if (jobParameter.getChoices().isEmpty() && jobParameterRenderer instanceof GitParameterRenderer) {
+                JobParameter gitParameter = JobParameter.builder()
+                        .name(jobParameter.getName())
+                        .description(jobParameter.getDescription())
+                        .jobParameterType(jobParameter.getJobParameterType())
+                        .defaultValue(jobParameter.getDefaultValue())
+                        .choices(requestManager.getGitParameterChoices(job, jobParameter))
+                        .build();
+                jobParameterComponent = jobParameterRenderer.render(gitParameter);
+            } else {
+                jobParameterComponent = jobParameterRenderer.render(jobParameter);
+            }
+
             if (jobParameterComponent.isVisible()) {
                 rows.incrementAndGet();
                 jobParameterComponent.getViewElement().setName(jobParameter.getName());