Bean completion invocation for this. prefix

Author: BoykoAlex

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/beans/BeanCompletionProvider.java

@@ -19,11 +19,14 @@
 
 import org.eclipse.jdt.core.dom.ASTNode;
 import org.eclipse.jdt.core.dom.Annotation;
+import org.eclipse.jdt.core.dom.Assignment;
 import org.eclipse.jdt.core.dom.Block;
 import org.eclipse.jdt.core.dom.CompilationUnit;
+import org.eclipse.jdt.core.dom.FieldAccess;
 import org.eclipse.jdt.core.dom.IAnnotationBinding;
 import org.eclipse.jdt.core.dom.ITypeBinding;
 import org.eclipse.jdt.core.dom.SimpleName;
+import org.eclipse.jdt.core.dom.ThisExpression;
 import org.eclipse.jdt.core.dom.TypeDeclaration;
 import org.eclipse.jdt.core.dom.VariableDeclaration;
 import org.slf4j.Logger;
@@ -81,6 +84,14 @@ public void provideCompletions(ASTNode node, int offset, TextDocument doc,
 		            return;
 		        }
 
+	        	// Empty SimpleName usually comes from unresolved FieldAccess, i.e. `this.owner` where `owner` field is not defined
+		        if (node instanceof SimpleName se && se.getLength() == 0
+		        		&& node.getParent() instanceof Assignment assign 
+		        		&& assign.getLeftHandSide() instanceof FieldAccess fa
+		        		&& fa.getExpression() instanceof ThisExpression) {
+		        	node = fa.getName();
+		        }
+		        
 				if (isSpringComponent(topLevelClass)) {
 		            String className = getFullyQualifiedName(topLevelClass);
 					Bean[] beans = this.springIndex.getBeansOfProject(project.getElementName());

headless-services/spring-boot-language-server/src/test/java/org/springframework/ide/vscode/boot/java/beans/test/BeanCompletionProviderTest.java

@@ -482,6 +482,43 @@ public void test() {
 									""");
 	}
 
+	@Test
+	public void beanCompletionWithThis() throws Exception {
+		String content = """
+				package org.sample.test;
+				
+				import org.springframework.stereotype.Controller;
+				
+				@Controller
+				public class TestBeanCompletionClass {
+					public void test() {
+						this.owner<*>
+					}
+				}
+				""";
+		
+		
+		assertCompletions(content, new String[] {"ownerRepository", "ownerService"}, 0, 
+				"""
+				package org.sample.test;
+				
+				import org.springframework.samples.petclinic.owner.OwnerRepository;
+				import org.springframework.stereotype.Controller;
+				
+				@Controller
+				public class TestBeanCompletionClass {
+				
+				    private final OwnerRepository ownerRepository;
+				
+				    TestBeanCompletionClass(OwnerRepository ownerRepository) {
+				        this.ownerRepository = ownerRepository;
+				    }
+					public void test() {
+						this.ownerRepository<*>
+					}
+				}
+				""");
+	}
 
 
 	private void assertCompletions(String completionLine, String[] expectedCompletions, int chosenCompletion, String expectedResult) throws Exception {