add cancel support to job

unused.methods/src/unused/methods/FindUnusedMethodsInJavaProject.java

@@ -27,38 +27,50 @@ public FindUnusedMethodsInJavaProject(IJavaProject project) {
 	protected IStatus run(IProgressMonitor monitor) {
 		try {
 
-			findUnusedMethods(monitor);
+			return findUnusedMethods(monitor);
 
 		} catch (JavaModelException e) {
 			String pluginId = UnusedMethodsPlugin.getDefault().getBundle().getSymbolicName();
 			return new Status(ERROR, pluginId, "Problem searching for unused methods in " + project.getElementName(), e);
 		}
-
-		return Status.OK_STATUS;
 	}
 
-	void findUnusedMethods(IProgressMonitor monitor) throws JavaModelException {
-		DeclaredMethods methods = new DeclaredMethods();
-		methods.addFilter(new DoNotAcceptAnnotation("org.junit.Test"));
-		methods.addFilter(new DoNotAcceptMethodsOverridingBinary());
+	private IStatus findUnusedMethods(IProgressMonitor monitor) throws JavaModelException {
 		List<IJavaProject> allJavaProjects = new JavaProjectsInWorkspace().collectAllJavaProjects();
 
 		int totalWork = 1 + allJavaProjects.size();
-		monitor.beginTask("Searching for unused methods", totalWork);
+		monitor.beginTask("Searching for unused methods in " + project.getElementName(), totalWork);
 
 		monitor.subTask("Collecting declared methods from " + project.getElementName());
+		DeclaredMethods methods = setupDeclaredMethods();
 		new JavaAstParser(project).accept(new AddDeclaredMethodsTo(methods));
 		monitor.worked(1);
 
+		if (monitor.isCanceled()) {
+			return Status.CANCEL_STATUS;
+		}
+
 		for (IJavaProject javaProject : allJavaProjects) {
-			monitor.subTask("Removing methods used by " + project.getElementName());
+			monitor.subTask("Removing methods used by " + javaProject.getElementName());
 			new JavaAstParser(javaProject).accept(new RemoveUsedMethodsFrom(methods));
 			monitor.worked(1);
+
+			if (monitor.isCanceled()) {
+				return Status.CANCEL_STATUS;
+			}
 		}
 
 		monitor.done();
 
 		unusedMethods = methods.getMethods();
+		return Status.OK_STATUS;
+	}
+
+	private DeclaredMethods setupDeclaredMethods() throws JavaModelException {
+		DeclaredMethods methods = new DeclaredMethods();
+		methods.addFilter(new DoNotAcceptAnnotation("org.junit.Test"));
+		methods.addFilter(new DoNotAcceptMethodsOverridingBinary());
+		return methods;
 	}
 
 	public List<IMethod> getUnusedMethods() {

unused.methods/test/unused/methods/FindUnusedMethodsInJavaProjectPdeTest.java

@@ -37,7 +37,7 @@ public void findUnusedMethodsInProject() throws CoreException, IOException {
 
 	private List<IMethod> calculateUnusedMethods() throws JavaModelException {
 		FindUnusedMethodsInJavaProject finder = new FindUnusedMethodsInJavaProject(project.asJavaProject());
-		finder.findUnusedMethods(new NullProgressMonitor());
+		finder.run(new NullProgressMonitor());
 		return finder.getUnusedMethods();
 	}
 }