private ServerCapabilities createServerCapabilities() {
	ServerCapabilities capabilities = new ServerCapabilities();
	capabilities.setTextDocumentSync(TextDocumentSyncKind.Full);
	capabilities.setCompletionProvider(new CompletionOptions(Boolean.TRUE, Arrays.asList(".","?","&", "\"", "=")));
	capabilities.setHoverProvider(Boolean.TRUE);
	capabilities.setDocumentSymbolProvider(Boolean.TRUE);
	capabilities.setReferencesProvider(Boolean.TRUE);
	capabilities.setDefinitionProvider(Boolean.TRUE);
	capabilities.setCodeActionProvider(new CodeActionOptions(Arrays.asList(CodeActionKind.QuickFix)));
	return capabilities;
}
 

private CodeActionOptions getCodeActionOptions() {
	String[] kinds = { CodeActionKind.QuickFix, CodeActionKind.Refactor, CodeActionKind.RefactorExtract, CodeActionKind.RefactorInline, CodeActionKind.RefactorRewrite, CodeActionKind.Source, CodeActionKind.SourceOrganizeImports };
	List<String> codeActionKinds = new ArrayList<>();
	for (String kind : kinds) {
		if (preferenceManager.getClientPreferences().isSupportedCodeActionKind(kind)) {
			codeActionKinds.add(kind);
		}
	}
	CodeActionOptions options = new CodeActionOptions(codeActionKinds);
	return options;
}
 

public void setCodeActionProvider(final CodeActionOptions codeActionProvider) {
  if (codeActionProvider == null) {
    this.codeActionProvider = null;
    return;
  }
  this.codeActionProvider = Either.forRight(codeActionProvider);
}
 

/**
 * Configure the server capabilities for this instance.
 *
 * @param params
 *            the initialization parameters
 * @return the server capabilities
 */
protected ServerCapabilities createServerCapabilities(InitializeParams params) {
	ServerCapabilities serverCapabilities = new ServerCapabilities();
	serverCapabilities.setHoverProvider(true);
	serverCapabilities.setDefinitionProvider(true);
	serverCapabilities.setReferencesProvider(true);
	serverCapabilities.setDocumentSymbolProvider(true);
	serverCapabilities.setWorkspaceSymbolProvider(true);
	Set<? extends IResourceServiceProvider> allLanguages = getAllLanguages();
	if (allLanguages.stream().anyMatch((serviceProvider) -> serviceProvider.get(ICodeLensService.class) != null)) {
		CodeLensOptions codeLensOptions = new CodeLensOptions();
		codeLensOptions.setResolveProvider(allLanguages.stream()
				.anyMatch((serviceProvider) -> serviceProvider.get(ICodeLensResolver.class) != null));
		serverCapabilities.setCodeLensProvider(codeLensOptions);
	}
	boolean supportsCodeActions = allLanguages.stream()
			.anyMatch((serviceProvider) -> serviceProvider.get(ICodeActionService.class) != null
					|| serviceProvider.get(ICodeActionService2.class) != null);
	if (supportsCodeActions) {
		Optional<List<String>> supportedKinds = getSupportedCodeActionKinds();
		if (supportedKinds.isPresent()) {
			serverCapabilities.setCodeActionProvider(new CodeActionOptions(supportedKinds.get()));
		} else {
			serverCapabilities.setCodeActionProvider(true);
		}
	} else {
		serverCapabilities.setCodeActionProvider(false);
	}

	serverCapabilities.setSignatureHelpProvider(new SignatureHelpOptions(ImmutableList.of("(", ",")));
	serverCapabilities.setTextDocumentSync(TextDocumentSyncKind.Incremental);
	CompletionOptions completionOptions = new CompletionOptions();
	completionOptions.setResolveProvider(false);
	completionOptions.setTriggerCharacters(ImmutableList.of("."));
	serverCapabilities.setCompletionProvider(completionOptions);
	serverCapabilities.setDocumentFormattingProvider(true);
	serverCapabilities.setDocumentRangeFormattingProvider(true);
	serverCapabilities.setDocumentHighlightProvider(true);
	ClientCapabilities clientCapabilities = null;
	if (params != null) {
		clientCapabilities = params.getCapabilities();
	}
	TextDocumentClientCapabilities textDocument = null;
	if (clientCapabilities != null) {
		textDocument = clientCapabilities.getTextDocument();
	}
	RenameCapabilities rename = null;
	if (textDocument != null) {
		rename = textDocument.getRename();
	}
	Boolean prepareSupport = null;
	if (rename != null) {
		prepareSupport = rename.getPrepareSupport();
	}
	boolean clientPrepareSupport = Objects.equal(Boolean.TRUE, prepareSupport);
	if (clientPrepareSupport && allLanguages.stream()
			.anyMatch(serviceProvider -> serviceProvider.get(IRenameService2.class) != null)) {
		RenameOptions renameOptions = new RenameOptions();
		renameOptions.setPrepareProvider(true);
		serverCapabilities.setRenameProvider(Either.<Boolean, RenameOptions> forRight(renameOptions));
	} else {
		serverCapabilities.setRenameProvider(Either.forLeft(allLanguages.stream()
				.anyMatch((serviceProvider) -> serviceProvider.get(IRenameService.class) != null
						|| serviceProvider.get(IRenameService2.class) != null)));
	}
	WorkspaceClientCapabilities workspace = null;
	if (clientCapabilities != null) {
		workspace = clientCapabilities.getWorkspace();
	}
	ExecuteCommandCapabilities executeCommand = null;
	if (workspace != null) {
		executeCommand = workspace.getExecuteCommand();
	}
	if (executeCommand != null) {
		commandRegistry.initialize(allLanguages, clientCapabilities, client);
		ExecuteCommandOptions executeCommandOptions = new ExecuteCommandOptions();
		executeCommandOptions.setCommands(commandRegistry.getCommands());
		serverCapabilities.setExecuteCommandProvider(executeCommandOptions);
	}
	semanticHighlightingRegistry.initialize(allLanguages, clientCapabilities, client);
	serverCapabilities.setSemanticHighlighting(new SemanticHighlightingServerCapabilities(
			semanticHighlightingRegistry.getAllScopes()));

	for (IResourceServiceProvider language : allLanguages) {
		ICapabilitiesContributor capabilitiesContributor = language.get(ICapabilitiesContributor.class);
		if (capabilitiesContributor != null) {
			capabilitiesContributor.contribute(serverCapabilities, params);
		}
	}
	return serverCapabilities;
}
 

public void setBindings(LSPBindings bindings) {
    this.bindings = bindings;
    ServerCapabilities serverCapabilities = bindings.getInitResult().getCapabilities();
    Either<Boolean, CodeActionOptions> codeActions = serverCapabilities.getCodeActionProvider();
    allowCodeActions = codeActions != null && (!codeActions.isLeft() || codeActions.getLeft());
}
 

/**
 * The server provides code actions. The `CodeActionOptions` return type is only
 * valid if the client signals code action literal support via the property
 * `textDocument.codeAction.codeActionLiteralSupport`.
 */
@Pure
public Either<Boolean, CodeActionOptions> getCodeActionProvider() {
  return this.codeActionProvider;
}
 

/**
 * The server provides code actions. The `CodeActionOptions` return type is only
 * valid if the client signals code action literal support via the property
 * `textDocument.codeAction.codeActionLiteralSupport`.
 */
public void setCodeActionProvider(final Either<Boolean, CodeActionOptions> codeActionProvider) {
  this.codeActionProvider = codeActionProvider;
}