Use isEmpty() instead of size()==0 where possible

Change-Id: I97f1367a2ea9f1f6146e264c27c3981b842f2a26
Signed-off-by: Carsten Hammer <carsten.hammer@t-online.de>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/opt/PathTreeFilterHandler.java

@@ -96,7 +96,7 @@ public class PathTreeFilterHandler extends OptionHandler<TreeFilter> {
 			filters.add(PathFilter.create(path));
 		}
 
-		if (filters.size() == 0)
+		if (filters.isEmpty())
 			return 0;
 		if (filters.size() == 1) {
 			setter.addValue(filters.get(0));

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

@@ -128,7 +128,7 @@ public class CleanCommandTest extends RepositoryTestCase {
 		status = git.status().call();
 		files = status.getUntracked();
 
-		assertTrue(files.size() == 0);
+		assertTrue(files.isEmpty());
 		assertTrue(cleanedFiles.contains("File2.txt"));
 		assertTrue(cleanedFiles.contains("File3.txt"));
 		assertTrue(!cleanedFiles.contains("sub-noclean/File1.txt"));

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ReflogConfigTest.java

@@ -45,7 +45,6 @@
 
 package org.eclipse.jgit.lib;
 
-import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
@@ -63,7 +62,8 @@ public class ReflogConfigTest extends RepositoryTestCase {
 
 		// check that there are no entries in the reflog and turn off writing
 		// reflogs
-		assertEquals(0, db.getReflogReader(Constants.HEAD).getReverseEntries().size());
+		assertTrue(db.getReflogReader(Constants.HEAD).getReverseEntries()
+				.isEmpty());
 		final FileBasedConfig cfg = db.getConfig();
 		cfg.setBoolean("core", null, "logallrefupdates", false);
 		cfg.save();
@@ -72,9 +72,8 @@ public class ReflogConfigTest extends RepositoryTestCase {
 		// written
 		commit("A Commit\n", commitTime, tz);
 		commitTime += 60 * 1000;
-		assertTrue(
-				"Reflog for HEAD still contain no entry",
-				db.getReflogReader(Constants.HEAD).getReverseEntries().size() == 0);
+		assertTrue("Reflog for HEAD still contain no entry", db
+				.getReflogReader(Constants.HEAD).getReverseEntries().isEmpty());
 
 		// set the logAllRefUpdates parameter to true and check it
 		cfg.setBoolean("core", null, "logallrefupdates", true);

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

@@ -282,7 +282,7 @@ public class CommitCommand extends GitCommand<RevCommit> {
 					ru.setRefLogMessage(reflogComment, false);
 				} else {
 					String prefix = amend ? "commit (amend): " //$NON-NLS-1$
-							: parents.size() == 0 ? "commit (initial): " //$NON-NLS-1$
+							: parents.isEmpty() ? "commit (initial): " //$NON-NLS-1$
 									: "commit: "; //$NON-NLS-1$
 					ru.setRefLogMessage(prefix + revCommit.getShortMessage(),
 							false);

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

@@ -246,9 +246,9 @@ public class DescribeCommand extends GitCommand<String> {
 	};
 
 	private Optional<Ref> getBestMatch(List<Ref> tags) {
-		if (tags == null || tags.size() == 0) {
+		if (tags == null || tags.isEmpty()) {
 			return Optional.empty();
-		} else if (matchers.size() == 0) {
+		} else if (matchers.isEmpty()) {
 			Collections.sort(tags, TAG_TIE_BREAKER);
 			return Optional.of(tags.get(0));
 		} else {

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

@@ -362,7 +362,7 @@ public class RebaseCommand extends GitCommand<RebaseResult> {
 
 			List<RebaseTodoLine> steps = repo.readRebaseTodo(
 					rebaseState.getPath(GIT_REBASE_TODO), false);
-			if (steps.size() == 0) {
+			if (steps.isEmpty()) {
 				return finishRebase(walk.parseCommit(repo.resolve(Constants.HEAD)), false);
 			}
 			if (isInteractive()) {

org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffFormatter.java

@@ -1063,7 +1063,7 @@ public class DiffFormatter implements AutoCloseable {
 					entry.newId = id;
 					break;
 				}
-			} else if (ids.size() == 0)
+			} else if (ids.isEmpty())
 				throw new MissingObjectException(id, Constants.OBJ_BLOB);
 			else
 				throw new AmbiguousObjectException(id, ids);

org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheCheckout.java

@@ -632,7 +632,7 @@ public class DirCacheCheckout {
 			if (!builder.commit())
 				throw new IndexWriteException();
 		}
-		return toBeDeleted.size() == 0;
+		return toBeDeleted.isEmpty();
 	}
 
 	private void checkoutGitlink(String path, DirCacheEntry entry)

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectory.java

@@ -745,7 +745,7 @@ public class RefDirectory extends RefDatabase {
 		for (LockFile ol : heldLocks.values()) {
 			ol.requireLock();
 		}
-		if (refs.size() == 0) {
+		if (refs.isEmpty()) {
 			return null;
 		}
 		FS fs = parent.getFS();

org.eclipse.jgit/src/org/eclipse/jgit/lib/Repository.java

@@ -923,7 +923,7 @@ public abstract class Repository implements AutoCloseable {
 		AbbreviatedObjectId id = AbbreviatedObjectId.fromString(revstr);
 		try (ObjectReader reader = newObjectReader()) {
 			Collection<ObjectId> matches = reader.resolve(id);
-			if (matches.size() == 0)
+			if (matches.isEmpty())
 				return null;
 			else if (matches.size() == 1)
 				return matches.iterator().next();

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

@@ -1179,7 +1179,7 @@ public class ResolveMerger extends ThreeWayMerger {
 	 *         fail.
 	 */
 	public Map<String, MergeFailureReason> getFailingPaths() {
-		return (failingPaths.size() == 0) ? null : failingPaths;
+		return failingPaths.isEmpty() ? null : failingPaths;
 	}
 
 	/**

org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevWalk.java

@@ -506,7 +506,7 @@ public class RevWalk implements Iterable<RevCommit>, AutoCloseable {
 
 		if (sorting.size() > 1)
 			sorting.remove(RevSort.NONE);
-		else if (sorting.size() == 0)
+		else if (sorting.isEmpty())
 			sorting.add(RevSort.NONE);
 	}
 

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

@@ -229,8 +229,9 @@ public class BundleWriter {
 			packWriter.setDeltaBaseAsOffset(true);
 			packWriter.setThin(exc.size() > 0);
 			packWriter.setReuseValidatingObjects(false);
-			if (exc.size() == 0)
+			if (exc.isEmpty()) {
 				packWriter.setTagTargets(tagTargets);
+			}
 			packWriter.preparePack(monitor, inc, exc);
 
 			final Writer w = new OutputStreamWriter(os, UTF_8);