Consistently use "!isEmpty()" to detect non-empty list

Replace "size() > 0" with "!isEmpty()" where appropriate.

In the Status implementation we can drop the check; the subsequent
loop will only execute when the list is non-empty anyway.

Change-Id: I355aff551a603373e702a9d44304f087b476263c
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/TransferHandler.java

 		@Override
 		Body process() throws IOException {
 			Response.Body body = new Response.Body();
-			if (objects.size() > 0) {
+			if (!objects.isEmpty()) {
 				body.objects = new ArrayList<>();
 				for (LfsObject o : objects) {
 					addObjectInfo(body, o);
 		@Override
 		Body process() throws IOException {
 			Response.Body body = new Response.Body();
-			if (objects.size() > 0) {
+			if (!objects.isEmpty()) {
 				body.objects = new ArrayList<>();
 				for (LfsObject o : objects) {
 					addObjectInfo(body, o);

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Checkout.java

 		try (Git git = new Git(db)) {
 			CheckoutCommand command = git.checkout()
 					.setProgressMonitor(new TextProgressMonitor(errw));
-			if (paths.size() > 0) {
+			if (!paths.isEmpty()) {
 				command.setStartPoint(name);
 				if (paths.size() == 1 && paths.get(0).equals(".")) { //$NON-NLS-1$
 					command.setAllPaths(true);

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/LsFiles.java

 			CanonicalTreeParser p = new CanonicalTreeParser();
 			p.reset(rw.getObjectReader(), c.getTree());
 			tw.reset(); // drop the first empty tree, which we do not need here
-			if (paths.size() > 0) {
+			if (!paths.isEmpty()) {
 				tw.setFilter(PathFilterGroup.createFromStrings(paths));
 			}
 			tw.addTree(p);

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/LsTree.java

 	protected void run() {
 		try (TreeWalk walk = new TreeWalk(db)) {
 			walk.reset(); // drop the first empty tree, which we do not need here
-			if (paths.size() > 0) {
+			if (!paths.isEmpty()) {
 				walk.setFilter(PathFilterGroup.createFromStrings(paths));
 			}
 			walk.setRecursive(recursive);

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Reset.java

 		try (Git git = new Git(db)) {
 			ResetCommand command = git.reset();
 			command.setRef(commit);
-			if (paths.size() > 0) {
+			if (!paths.isEmpty()) {
 				for (String path : paths) {
 					command.addPath(path);
 				}

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Status.java

 	protected void run() {
 		try (Git git = new Git(db)) {
 			StatusCommand statusCommand = git.status();
-			if (filterPaths != null && filterPaths.size() > 0) {
+			if (filterPaths != null) {
 				for (String path : filterPaths) {
 					statusCommand.addPath(path);
 				}

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CleanCommandTest.java

 		StatusCommand command = git.status();
 		Status status = command.call();
 		Set<String> files = status.getUntracked();
-		assertTrue(files.size() > 0);
+		assertFalse(files.isEmpty());
 
 		// run clean
 		Set<String> cleanedFiles = git.clean().call();
 		StatusCommand command = git.status();
 		Status status = command.call();
 		Set<String> files = status.getUntracked();
-		assertTrue(files.size() > 0);
+		assertFalse(files.isEmpty());
 
 		// run clean
 		Set<String> cleanedFiles = git.clean().setCleanDirectories(true).call();
 		StatusCommand command = git.status();
 		Status status = command.call();
 		Set<String> files = status.getUntracked();
-		assertTrue(files.size() > 0);
+		assertFalse(files.isEmpty());
 
 		// run clean with setPaths
 		Set<String> paths = new TreeSet<>();
 		StatusCommand command = git.status();
 		Status status = command.call();
 		Set<String> files = status.getUntracked();
-		assertTrue(files.size() > 0);
+		assertFalse(files.isEmpty());
 
 		// run clean
 		Set<String> cleanedFiles = git.clean().setDryRun(true).call();
 		StatusCommand command = git.status();
 		Status status = command.call();
 		Set<String> files = status.getUntracked();
-		assertTrue(files.size() > 0);
+		assertFalse(files.isEmpty());
 
 		// run clean
 		Set<String> cleanedFiles = git.clean().setDryRun(true)

org.eclipse.jgit/src/org/eclipse/jgit/api/LogCommand.java

 	@Override
 	public Iterable<RevCommit> call() throws GitAPIException, NoHeadException {
 		checkCallable();
-		if (pathFilters.size() > 0)
+		if (!pathFilters.isEmpty())
 			walk.setTreeFilter(AndTreeFilter.create(
 					PathFilterGroup.create(pathFilters), TreeFilter.ANY_DIFF));
 		if (skip > -1 && maxCount > -1)

org.eclipse.jgit/src/org/eclipse/jgit/api/RebaseCommand.java

 			resetSoftToParent();
 			List<RebaseTodoLine> steps = repo.readRebaseTodo(
 					rebaseState.getPath(GIT_REBASE_TODO), false);
-			RebaseTodoLine nextStep = steps.size() > 0 ? steps.get(0) : null;
+			RebaseTodoLine nextStep = steps.isEmpty() ? null : steps.get(0);
 			File messageFixupFile = rebaseState.getFile(MESSAGE_FIXUP);
 			File messageSquashFile = rebaseState.getFile(MESSAGE_SQUASH);
 			if (isSquash && messageFixupFile.exists())
 
 		repo.writeRebaseTodoFile(rebaseState.getPath(GIT_REBASE_TODO),
 				todoLines, false);
-		if (poppedLines.size() > 0) {
+		if (!poppedLines.isEmpty()) {
 			repo.writeRebaseTodoFile(rebaseState.getPath(DONE), poppedLines,
 					true);
 		}

org.eclipse.jgit/src/org/eclipse/jgit/merge/ResolveMerger.java

 	 *         otherwise
 	 */
 	public boolean failed() {
-		return failingPaths.size() > 0;
+		return !failingPaths.isEmpty();
 	}
 
 	/**

org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleWriter.java

 				exc.add(r.getId());
 			packWriter.setIndexDisabled(true);
 			packWriter.setDeltaBaseAsOffset(true);
-			packWriter.setThin(exc.size() > 0);
+			packWriter.setThin(!exc.isEmpty());
 			packWriter.setReuseValidatingObjects(false);
 			if (exc.isEmpty()) {
 				packWriter.setTagTargets(tagTargets);