cleanup redundant code

src/org/intellij/grammar/BnfASTFactory.java

@@ -17,7 +17,7 @@
 final class BnfASTFactory extends ASTFactory {
 
  @Override
- public @Nullable CompositeElement createComposite(@NotNull IElementType type) {
+ public CompositeElement createComposite(@NotNull IElementType type) {
  return BnfTypes.Factory.createElement(type);
  }
 }

src/org/intellij/grammar/BnfDocumentationProvider.java

@@ -32,16 +32,6 @@
  */
 final class BnfDocumentationProvider implements DocumentationProvider {
 
- @Override
- public @Nullable String getQuickNavigateInfo(PsiElement element, PsiElement originalElement) {
- return null;
- }
-
- @Override
- public @Nullable List<String> getUrlFor(PsiElement element, PsiElement originalElement) {
- return null;
- }
-
  @Override
  public @Nullable String generateDoc(PsiElement element, PsiElement originalElement) {
  if (element instanceof BnfRule) {
@@ -89,16 +79,6 @@ else if (element instanceof BnfAttr) {
  return null;
  }
 
- @Override
- public @Nullable PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object obj5ect, PsiElement element) {
- return null;
- }
-
- @Override
- public @Nullable PsiElement getDocumentationElementForLink(PsiManager psiManager, String link, PsiElement context) {
- return null;
- }
-
  private static void dumpContents(StringBuilder docBuilder, BnfRule rule, BnfFile file) {
  Map<PsiElement, RuleGraphHelper.Cardinality> map = RuleGraphHelper.getCached(file).getFor(rule);
  Collection<BnfRule> sortedPublicRules = ParserGeneratorUtil.getSortedPublicRules(map.keySet());

src/org/intellij/grammar/livePreview/LivePreviewFileType.java

@@ -29,6 +29,7 @@ private LivePreviewFileType() {
  return "BNF_LP";
  }
 
+ @SuppressWarnings("DialogTitleCapitalization")
  @Override
  public @NotNull String getDescription() {
  return GrammarKitBundle.message("language.name.bnf.live.preview");
@@ -40,17 +41,8 @@ private LivePreviewFileType() {
  }
 
  @Override
- public @Nullable Icon getIcon() {
+ public Icon getIcon() {
  return BnfIcons.FILE;
  }
 
- @Override
- public boolean isReadOnly() {
- return false;
- }
-
- @Override
- public @Nullable String getCharset(@NotNull VirtualFile file, byte @NotNull [] content) {
- return null;
- }
 }

src/org/intellij/jflex/parser/JFlexASTFactory.java

@@ -17,7 +17,7 @@
 final class JFlexASTFactory extends ASTFactory {
 
  @Override
- public @Nullable CompositeElement createComposite(@NotNull IElementType type) {
+ public CompositeElement createComposite(@NotNull IElementType type) {
  return JFlexTypes.Factory.createElement(type);
  }
 }

tests/org/intellij/grammar/expression/ExpressionParserDefinition.java

@@ -80,10 +80,6 @@ public FileType getFileType() {
  return FILE_TYPE;
  }
 
- @Override
- public void accept(@NotNull PsiElementVisitor visitor) {
- visitor.visitFile(this);
- }
  };
  }
 

tests/org/intellij/grammar/inspection/BnfHighlightingTest.java

@@ -104,11 +104,6 @@ private void doTest() {
  myFixture.checkHighlighting(true, false, false);
  }
 
- @Override
- protected boolean isWriteActionRequired() {
- return false;
- }
-
  private static void toggleGrammarKitSrc(Module module, String testDataPath) {
  String absolutePath = new File("").getAbsolutePath();
  JavaPsiFacade facade = JavaPsiFacade.getInstance(module.getProject());