下面列出了怎么用org.eclipse.lsp4j.SignatureHelp的API类实例代码及写法，或者点击链接到github查看源代码。
public SignatureHelp getSignatureHelp(IProgressMonitor monitor) {
SignatureHelp signatureHelp = new SignatureHelp();
response.setProposals(proposals);
CompletionResponses.store(response);
List<SignatureInformation> infos = new ArrayList<>();
for (int i = 0; i < proposals.size(); i++) {
if (!monitor.isCanceled()) {
CompletionProposal proposal = proposals.get(i);
SignatureInformation signatureInformation = this.toSignatureInformation(proposal);
infoProposals.put(signatureInformation, proposal);
infos.add(signatureInformation);
} else {
return signatureHelp;
}
}
infos.sort((SignatureInformation a, SignatureInformation b) -> a.getParameters().size() - b.getParameters().size());
signatureHelp.getSignatures().addAll(infos);
return signatureHelp;
}
@Test
public void testSignatureHelp_singleMethod() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" /** This is a method */\n");
buf.append(" public int foo(String s) { }\n");
buf.append(" public int bar(String s) { this.foo() }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 4, 39);
assertNotNull(help);
assertEquals(1, help.getSignatures().size());
assertEquals("foo(String s) : int", help.getSignatures().get(0).getLabel());
assertTrue(help.getSignatures().get(0).getDocumentation().getLeft().length() > 0);
assertEquals((Integer) 0, help.getActiveParameter());
}
@Test
public void testSignatureHelp_multipeMethod() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public int foo(String s) { }\n");
buf.append(" public int foo(int s) { }\n");
buf.append(" public int foo(int s, String s) { }\n");
buf.append(" public int bar(String s) { this.foo(2, ) }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 5, 42);
assertNotNull(help);
assertEquals(3, help.getSignatures().size());
assertEquals((Integer) 1, help.getActiveParameter());
assertEquals(help.getSignatures().get(help.getActiveSignature()).getLabel(), "foo(int s, String s) : int");
}
@Test
public void testSignatureHelp_binary() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public int bar(String s) { System.out.println( }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 2, 50);
assertNotNull(help);
assertTrue(help.getSignatures().size() >= 10);
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().equals("println() : void"));
SignatureHelp help2 = getSignatureHelp(cu, 2, 49);
assertEquals(help.getSignatures().size(), help2.getSignatures().size());
assertEquals(help.getActiveSignature(), help2.getActiveSignature());
}
@Test
public void testSignatureHelp_parameters() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public boolean bar() {\n");
buf.append(" foo(\"\",)\n");
buf.append(" return true;\n");
buf.append(" }\n");
buf.append(" public void foo(String s) {}\n");
buf.append(" public void foo(String s, boolean bar) {}\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 3, 12);
assertNotNull(help);
assertEquals(2, help.getSignatures().size());
assertEquals(help.getSignatures().get(help.getActiveSignature()).getLabel(), "foo(String s, boolean bar) : void");
}
@Test
public void testSignatureHelp_activeSignature() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public void bar() {\n");
buf.append(" foo(\"a\",\"b\");\n");
buf.append(" }\n");
buf.append(" public void foo(String s) {}\n");
buf.append(" public void foo(String s, String b) {}\n");
buf.append(" public void foo() {}\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 3, 12);
assertNotNull(help);
assertEquals(3, help.getSignatures().size());
assertEquals(help.getSignatures().get(help.getActiveSignature()).getLabel(), "foo(String s, String b) : void");
}
@Test
public void testSignatureHelp_constructor() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public void bar() {\n");
buf.append(" new RuntimeException()\n");
buf.append(" }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 3, 26);
assertNotNull(help);
assertEquals(4, help.getSignatures().size());
assertEquals(help.getSignatures().get(help.getActiveSignature()).getLabel(), "RuntimeException()");
}
@Test
public void testSignatureHelp_constructorParameters() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public void bar() {\n");
buf.append(" new RuntimeException(\"t\", )\n");
buf.append(" }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 3, 31);
assertNotNull(help);
assertEquals(4, help.getSignatures().size());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().matches("RuntimeException\\(String \\w+, Throwable \\w+\\)"));
}
@Test
public void testSignatureHelp_constructorParameters2() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public void bar() {\n");
buf.append(" new RuntimeException(\"foo\")\n");
buf.append(" }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 3, 31);
assertNotNull(help);
assertEquals(4, help.getSignatures().size());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().matches("RuntimeException\\(String \\w+\\)"));
}
@Test
public void testSignatureHelp_javadoc() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append("/**\n");
buf.append(" * @see String#substring()\n");
buf.append(" */\n");
buf.append(" public int test() {}\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 3, 25);
assertNotNull(help);
assertEquals(2, help.getSignatures().size());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().matches("substring\\(\\w+ \\w+\\) : String"));
}
@Test
public void testSignatureHelp_javadocOriginal() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("import java.util.LinkedList;\n");
buf.append("import org.sample.MyList;\n");
buf.append("public class E {\n\n");
buf.append(" void test() {\n");
buf.append(" MyList<String> l = new LinkedList<>();\n");
buf.append(" l.add(\n");
buf.append(" }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
int[] loc = findCompletionLocation(cu, "l.add(");
SignatureHelp help = getSignatureHelp(cu, loc[0], loc[1]);
assertNotNull(help);
assertEquals(2, help.getSignatures().size());
SignatureInformation signature = help.getSignatures().get(help.getActiveSignature());
assertTrue(signature.getLabel().equals("add(String e) : boolean"));
String documentation = signature.getDocumentation().getLeft();
assertEquals(" Test ", documentation);
}
@Test
public void testSignatureHelp_varargs() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("import java.util.Arrays;\n");
buf.append("public class E {\n");
buf.append(" public static void main(String[] args) {\n");
buf.append(" Arrays.asList(1,2,3);\n");
buf.append(" demo(\"1\", \"2\",\"3\" )\n");
buf.append(" }\n");
buf.append(" public static void demo (String s, String... s2) {\n");
buf.append(" }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 4, 21);
assertNotNull(help);
assertEquals(1, help.getSignatures().size());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().startsWith("asList(T... "));
help = getSignatureHelp(cu, 5, 19);
assertNotNull(help);
assertEquals(1, help.getSignatures().size());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().equals("demo(String s, String... s2) : void"));
}
@Test
public void testSignatureHelp_parameterTypes() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public static void main(String[] args) {\n");
buf.append(" new RuntimeException(new Exception(),)\n");
buf.append(" }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 3, 40);
assertNotNull(help);
assertEquals(4, help.getSignatures().size());
assertNull(help.getActiveParameter());
}
@Test
public void testSignatureHelp_parameterObject() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public static void main(String[] args) {\n");
buf.append(" Object foo = new Object();\n");
buf.append(" System.err.println(foo);\n");
buf.append(" }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 4, 23);
assertNotNull(help);
assertEquals(10, help.getSignatures().size());
assertNotNull(help.getActiveParameter());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().matches("println\\(Object \\w+\\) : void"));
}
@Override
public SignatureHelp getSignatureHelp(final Document document, final XtextResource resource, final SignatureHelpParams params, final CancelIndicator cancelIndicator) {
final int offset = document.getOffSet(params.getPosition());
Preconditions.<XtextResource>checkNotNull(resource, "resource");
Preconditions.checkArgument((offset >= 0), ("offset >= 0. Was: " + Integer.valueOf(offset)));
final EObject object = this.offsetHelper.resolveContainedElementAt(resource, offset);
if ((object instanceof OperationCall)) {
final String operationName = this.getOperationName(((OperationCall)object));
boolean _isNullOrEmpty = StringExtensions.isNullOrEmpty(operationName);
boolean _not = (!_isNullOrEmpty);
if (_not) {
return this.getSignatureHelp(((OperationCall)object), operationName, offset);
}
}
return ISignatureHelpService.EMPTY;
}
@Test
void testSignatureHelpOnMethod() throws Exception {
Path filePath = srcRoot.resolve("Completion.groovy");
String uri = filePath.toUri().toString();
StringBuilder contents = new StringBuilder();
contents.append("class SignatureHelp {\n");
contents.append(" public SignatureHelp() {\n");
contents.append(" method(\n");
contents.append(" }\n");
contents.append(" public void method(int param0) {}\n");
contents.append("}");
TextDocumentItem textDocumentItem = new TextDocumentItem(uri, LANGUAGE_GROOVY, 1, contents.toString());
services.didOpen(new DidOpenTextDocumentParams(textDocumentItem));
TextDocumentIdentifier textDocument = new TextDocumentIdentifier(uri);
Position position = new Position(2, 11);
SignatureHelp signatureHelp = services.signatureHelp(new TextDocumentPositionParams(textDocument, position))
.get();
List<SignatureInformation> signatures = signatureHelp.getSignatures();
Assertions.assertEquals(1, signatures.size());
SignatureInformation signature = signatures.get(0);
Assertions.assertEquals("public void method(int param0)", signature.getLabel());
List<ParameterInformation> params = signature.getParameters();
Assertions.assertEquals(1, params.size());
ParameterInformation param0 = params.get(0);
Assertions.assertEquals("int param0", param0.getLabel().get());
Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveSignature());
Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveParameter());
}
@Test
void testSignatureHelpOnMethodWithMultipleParameters() throws Exception {
Path filePath = srcRoot.resolve("Completion.groovy");
String uri = filePath.toUri().toString();
StringBuilder contents = new StringBuilder();
contents.append("class SignatureHelp {\n");
contents.append(" public SignatureHelp() {\n");
contents.append(" method(\n");
contents.append(" }\n");
contents.append(" public void method(int param0, String param1) {}\n");
contents.append("}");
TextDocumentItem textDocumentItem = new TextDocumentItem(uri, LANGUAGE_GROOVY, 1, contents.toString());
services.didOpen(new DidOpenTextDocumentParams(textDocumentItem));
TextDocumentIdentifier textDocument = new TextDocumentIdentifier(uri);
Position position = new Position(2, 11);
SignatureHelp signatureHelp = services.signatureHelp(new TextDocumentPositionParams(textDocument, position))
.get();
List<SignatureInformation> signatures = signatureHelp.getSignatures();
Assertions.assertEquals(1, signatures.size());
SignatureInformation signature = signatures.get(0);
Assertions.assertEquals("public void method(int param0, String param1)", signature.getLabel());
List<ParameterInformation> params = signature.getParameters();
Assertions.assertEquals(2, params.size());
ParameterInformation param0 = params.get(0);
Assertions.assertEquals("int param0", param0.getLabel().get());
ParameterInformation param1 = params.get(1);
Assertions.assertEquals("String param1", param1.getLabel().get());
Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveSignature());
Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveParameter());
}
@Test
void testSignatureHelpOnMethodWithActiveParameter() throws Exception {
Path filePath = srcRoot.resolve("Completion.groovy");
String uri = filePath.toUri().toString();
StringBuilder contents = new StringBuilder();
contents.append("class SignatureHelp {\n");
contents.append(" public SignatureHelp() {\n");
contents.append(" method(123,\n");
contents.append(" }\n");
contents.append(" public void method(int param0, String param1) {}\n");
contents.append("}");
TextDocumentItem textDocumentItem = new TextDocumentItem(uri, LANGUAGE_GROOVY, 1, contents.toString());
services.didOpen(new DidOpenTextDocumentParams(textDocumentItem));
TextDocumentIdentifier textDocument = new TextDocumentIdentifier(uri);
Position position = new Position(2, 15);
SignatureHelp signatureHelp = services.signatureHelp(new TextDocumentPositionParams(textDocument, position))
.get();
List<SignatureInformation> signatures = signatureHelp.getSignatures();
Assertions.assertEquals(1, signatures.size());
SignatureInformation signature = signatures.get(0);
Assertions.assertEquals("public void method(int param0, String param1)", signature.getLabel());
List<ParameterInformation> params = signature.getParameters();
Assertions.assertEquals(2, params.size());
ParameterInformation param0 = params.get(0);
Assertions.assertEquals("int param0", param0.getLabel().get());
ParameterInformation param1 = params.get(1);
Assertions.assertEquals("String param1", param1.getLabel().get());
Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveSignature());
Assertions.assertEquals((int) 1, (int) signatureHelp.getActiveParameter());
}
/** @return string for given element */
public String toString(SignatureHelp signatureHelp) {
if (signatureHelp == null) {
return "";
}
String str = Strings.join(", ",
signatureHelp.getActiveSignature(),
signatureHelp.getActiveParameter(),
Strings.toString(this::toString, signatureHelp.getSignatures()));
return "(" + str + ")";
}
@Override
public CompletableFuture<SignatureHelp> signatureHelp(TextDocumentPositionParams params) {
URI uri = getURI(params);
return openFilesManager.runInOpenFileContext(uri, "signatureHelp", (ofc, ci) -> {
return signatureHelp(ofc, params, ci);
});
}
/**
* Compute the signature help. Executed in a read request.
*/
protected SignatureHelp signatureHelp(OpenFileContext ofc, TextDocumentPositionParams params,
CancelIndicator cancelIndicator) {
URI uri = ofc.getURI();
ISignatureHelpService helper = getService(uri, ISignatureHelpService.class);
if (helper == null) {
return ISignatureHelpService.EMPTY;
}
XtextResource res = ofc.getResource();
XDocument doc = ofc.getDocument();
return helper.getSignatureHelp(doc, res, params, cancelIndicator);
}
private boolean isSameParameters(IMethod m, SignatureHelp help, SignatureHelpRequestor collector, IJavaProject javaProject) throws JavaModelException {
if (m == null || help == null || javaProject == null) {
return false;
}
List<SignatureInformation> infos = help.getSignatures();
for (int i = 0; i < infos.size(); i++) {
CompletionProposal proposal = collector.getInfoProposals().get(infos.get(i));
IMethod method = JDTUtils.resolveMethod(proposal, javaProject);
if (isSameParameters(method, m)) {
return true;
}
}
return false;
}
@Test
public void testSignatureHelp_invalid() throws JavaModelException {
IPackageFragment pack1 = sourceFolder.createPackageFragment("test1", false, null);
StringBuilder buf = new StringBuilder();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public int bar(String s) { if ( }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
SignatureHelp help = getSignatureHelp(cu, 2, 34);
assertNotNull(help);
assertEquals(0, help.getSignatures().size());
}
@Test
public void testSignatureHelp_varargs2() throws JavaModelException {
IJavaProject javaProject = JavaCore.create(project);
IType type = javaProject.findType("test1.Varargs");
ICompilationUnit cu = type.getCompilationUnit();
SignatureHelp help = getSignatureHelp(cu, 4, 16);
assertNotNull(help);
assertEquals(2, help.getSignatures().size());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().equals("run(Class<?> clazz, String... args) : void"));
}
@Test
public void testSignatureHelp_lambda() throws JavaModelException {
IJavaProject javaProject = JavaCore.create(project);
IType type = javaProject.findType("test1.SignatureHelp");
ICompilationUnit cu = type.getCompilationUnit();
SignatureHelp help = getSignatureHelp(cu, 8, 14);
assertNotNull(help);
assertEquals(1, help.getSignatures().size());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().equals("test(Function<String,String> f) : void"));
}
private void testStringLiteral(ICompilationUnit cu, int line, int character) {
SignatureHelp help = getSignatureHelp(cu, line, character);
assertNotNull(help);
assertEquals(1, help.getSignatures().size());
assertNotNull(help.getActiveParameter());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().equals("foo(String p, int x) : void"));
}
private void testAssertEquals(ICompilationUnit cu, int line, int character) {
SignatureHelp help = getSignatureHelp(cu, line, character);
assertNotNull(help);
assertEquals(12, help.getSignatures().size());
assertNotNull(help.getActiveParameter());
assertTrue(help.getSignatures().get(help.getActiveSignature()).getLabel().equals("assertEquals(long expected, long actual) : void"));
}
/**
* Displays a function's parameters, including which one is currently
* active. Called automatically by VSCode any time that the user types "(",
* so be sure to check that a function call is actually happening at the
* current position.
*/
@Override
public CompletableFuture<SignatureHelp> signatureHelp(SignatureHelpParams params)
{
return CompletableFutures.computeAsync(compilerWorkspace.getExecutorService(), cancelToken ->
{
cancelToken.checkCanceled();
//make sure that the latest changes have been passed to
//workspace.fileChanged() before proceeding
if(realTimeProblemsChecker != null)
{
realTimeProblemsChecker.updateNow();
}
compilerWorkspace.startBuilding();
try
{
SignatureHelpProvider provider = new SignatureHelpProvider(workspaceFolderManager, fileTracker);
return provider.signatureHelp(params, cancelToken);
}
finally
{
compilerWorkspace.doneBuilding();
}
});
}
protected String _toExpectation(final SignatureHelp it) {
String _xblockexpression = null;
{
int _size = it.getSignatures().size();
boolean _tripleEquals = (_size == 0);
if (_tripleEquals) {
StringConcatenation _builder = new StringConcatenation();
_builder.append("Signature index is expected to be null when no signatures are available. Was: ");
Integer _activeSignature = it.getActiveSignature();
_builder.append(_activeSignature);
_builder.append(".");
Assert.assertNull(_builder.toString(),
it.getActiveSignature());
return "<empty>";
}
Assert.assertNotNull("Active signature index must not be null when signatures are available.", it.getActiveSignature());
String _xifexpression = null;
Integer _activeParameter = it.getActiveParameter();
boolean _tripleEquals_1 = (_activeParameter == null);
if (_tripleEquals_1) {
_xifexpression = "<empty>";
} else {
_xifexpression = it.getSignatures().get((it.getActiveSignature()).intValue()).getParameters().get(
(it.getActiveParameter()).intValue()).getLabel().getLeft();
}
final String param = _xifexpression;
StringConcatenation _builder_1 = new StringConcatenation();
final Function1<SignatureInformation, String> _function = (SignatureInformation it_1) -> {
return it_1.getLabel();
};
String _join = IterableExtensions.join(ListExtensions.<SignatureInformation, String>map(it.getSignatures(), _function), " | ");
_builder_1.append(_join);
_builder_1.append(" | ");
_builder_1.append(param);
_xblockexpression = _builder_1.toString();
}
return _xblockexpression;
}
/**
* Compute the signature help. Executed in a read request.
* @since 2.20
*/
protected SignatureHelp signatureHelp(SignatureHelpParams params, CancelIndicator cancelIndicator) {
URI uri = getURI(params);
ISignatureHelpService helper = getService(uri, ISignatureHelpService.class);
if (helper == null) {
return ISignatureHelpService.EMPTY;
}
return workspaceManager.doRead(uri,
(doc, resource) -> helper.getSignatureHelp(doc, resource, params, cancelIndicator));
}