Correct constructor snippet for additional classes in a file

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/corext/template/java/CodeSnippetTemplate.java

@@ -110,7 +110,7 @@ class TemplatePreferences {
 	public static final String TRYCATCH_CONTENT = "try {\n" + "\t$$TM_SELECTED_TEXT$${1}\n" + "} catch ($${2:Exception} $${3:e}) {\n" + "\t$${0}// TODO: handle exception\n" + "}";
 	public static final String TRYRESOURCES_CONTENT = "try ($${1}) {\n" + "\t$$TM_SELECTED_TEXT$${2}\n" + "} catch ($${3:Exception} $${4:e}) {\n" + "\t$${0}// TODO: handle exception\n" + "}";
 	public static final String MAIN_CONTENT = "public static void main(String[] args) {\n" + "\t$${0}\n" + "}";
-	public static final String CTOR_CONTENT = "$${1|public,protected,private|} $${2:$$TM_FILENAME_BASE}($${3}) {\n" + "\t$${4:super();}$${0}\n" + "}";
+	public static final String CTOR_CONTENT = "$${1|public,protected,private|} ${enclosing_simple_type}($${2}) {\n" + "\t$${3:super();}$${0}\n" + "}";
 	public static final String METHOD_CONTENT = "$${1|public,protected,private|}$${2| , static |}$${3:void} $${4:name}($${5}) {\n" + "\t$${0}\n" + "}";
 	public static final String NEW_CONTENT = "$${1:Object} $${2:foo} = new $${1}($${3});\n" + "$${0}";
 	public static final String FIELD_CONTENT = "$${1|public,protected,private|} $${2:String} $${3:name};";

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/corext/template/java/JavaContextType.java

@@ -13,9 +13,15 @@
 
 package org.eclipse.jdt.ls.core.internal.corext.template.java;
 
+import org.eclipse.jdt.core.IJavaElement;
+import org.eclipse.jdt.core.IType;
+import org.eclipse.jdt.internal.core.manipulation.JavaElementLabelsCore;
 import org.eclipse.jdt.internal.corext.template.java.AbstractJavaContextTypeCore;
+import org.eclipse.jdt.internal.corext.template.java.CompilationUnitContext;
 import org.eclipse.jdt.internal.corext.template.java.IJavaContext;
+import org.eclipse.jdt.internal.corext.template.java.JavaTemplateMessages;
 import org.eclipse.jdt.internal.corext.template.java.VarResolver;
+import org.eclipse.jface.text.templates.TemplateContext;
 import org.eclipse.jface.text.templates.TemplateVariableResolver;
 
 /**
@@ -75,10 +81,44 @@ public void initializeContextTypeResolvers() {
 		// TODO: Some of the resolvers are defined in org.eclipse.jdt.ui/plugin.xml, now we have to add them manually.
 		// See: https://github.com/eclipse-jdt/eclipse.jdt.ui/blob/dc995e7a0069e1eca58b19a4bc365032c50b0201/org.eclipse.jdt.ui/plugin.xml#L5674-L5752
 		addResolver("var", new VarResolver());
+		addResolver(new SimpleType());
 	}
 
 	public synchronized void addResolver(String type, TemplateVariableResolver resolver) {
 		resolver.setType(type);
 		addResolver(resolver);
 	}
+
+	// Copied from org.eclipse.jdt.internal.corext.template.java.CompilationUnitContextType.EnclosingJavaElement
+	protected static class EnclosingJavaElement extends TemplateVariableResolver {
+		protected final int fElementType;
+
+		public EnclosingJavaElement(String name, String description, int elementType) {
+			super(name, description);
+			fElementType = elementType;
+		}
+
+		@Override
+		protected String resolve(TemplateContext context) {
+			IJavaElement element = ((CompilationUnitContext) context).findEnclosingElement(fElementType);
+			if (element instanceof IType) {
+				// Flag was changed to permit non-qualified types
+				return JavaElementLabelsCore.getElementLabel(element, 0);
+			}
+			return (element == null) ? null : element.getElementName();
+		}
+
+		@Override
+		protected boolean isUnambiguous(TemplateContext context) {
+			return resolve(context) != null;
+		}
+	}
+
+	// Copied from org.eclipse.jdt.internal.corext.template.java.CompilationUnitContextType.Type
+	protected static class SimpleType extends EnclosingJavaElement {
+		public SimpleType() {
+			super("enclosing_simple_type", JavaTemplateMessages.CompilationUnitContextType_variable_description_enclosing_type, IJavaElement.TYPE);
+		}
+	}
 }
+

org.eclipse.jdt.ls.tests/src/org/eclipse/jdt/ls/core/internal/handlers/CompletionHandlerTest.java

@@ -1282,6 +1282,28 @@ public void testSnippet_multiline_string() throws JavaModelException {
 		assertTrue(items.size() > 0);
 	}
 
+	@Test
+	public void testSnippet_ctor() throws JavaModelException {
+		//@formatter:off
+			ICompilationUnit unit = getWorkingCopy(
+				"src/org/sample/Test.java",
+				"package org.sample;\n" +
+				"public class MainClass {\n"
+				+ "}" +
+				"class AnotherClass {\n"
+				+ "ctor\n"
+				+ "}"
+			);
+			//@formatter:on
+		CompletionList list = requestCompletions(unit, "ctor");
+		assertNotNull(list);
+		List<CompletionItem> items = new ArrayList<>(list.getItems());
+		CompletionItem item = items.get(0);
+		assertEquals("ctor", item.getLabel());
+		String newText = item.getTextEdit().getLeft().getNewText();
+		assertEquals("${1|public,protected,private|} AnotherClass(${2}) {\n" + "\t${3:super();}${0}\n" + "}", newText);
+	}
+
 	@Test
 	public void testSnippet_interface() throws JavaModelException {
 		ICompilationUnit unit = getWorkingCopy("src/org/sample/Test.java", "");