make something a constant

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@278472 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/ProjectHelper.java

@@ -72,6 +72,11 @@ public class ProjectHelper {
      */
     public static final String SERVICE_ID =
         "META-INF/services/org.apache.tools.ant.ProjectHelper";
+    
+    /**
+     * name of project helper reference that we add to a project
+     */ 
+    public static final String PROJECTHELPER_REFERENCE = "ant.projectHelper";
 
     /**
      * Configures the project with the contents of the specified XML file.
@@ -86,7 +91,7 @@ public class ProjectHelper {
     public static void configureProject(Project project, File buildFile)
         throws BuildException {
         ProjectHelper helper = ProjectHelper.getProjectHelper();
-        project.addReference("ant.projectHelper", helper);
+        project.addReference(PROJECTHELPER_REFERENCE, helper);
         helper.parse(project, buildFile);
     }
 

src/main/org/apache/tools/ant/taskdefs/ImportTask.java

@@ -91,7 +91,8 @@ public class ImportTask extends Task {
         }
 
         ProjectHelper helper =
-                (ProjectHelper) getProject().getReference("ant.projectHelper");
+                (ProjectHelper) getProject().
+                    getReference(ProjectHelper.PROJECTHELPER_REFERENCE);
         Vector importStack = helper.getImportStack();
 
         if (importStack.size() == 0) {