Resolve path bindings through cross-class static helpers.

EntryPointBindingExpander follows single-arg normalize helpers declared on other types and accepts switch selectors wrapped by those helpers when extracting string case arms.

Co-authored-by: Cursor <cursoragent@cursor.com>

state_machine_exporter/src/test/java/click/kamil/springstatemachineexporter/analysis/service/EntryPointBindingExpanderTest.java

@@ -579,4 +579,112 @@ class EntryPointBindingExpanderTest {
         assertThat(variants).extracting(map -> map.get("event"))
                 .containsExactlyInAnyOrder("PAY", "SHIP");
     }
+
+    @Test
+    void shouldExpandEventWhenParameterIsPassedThroughCrossClassStaticHelper(@TempDir Path tempDir) throws Exception {
+        String source = """
+            package com.example;
+            public class OrderController {
+                OrderGateway gateway;
+                public void transition(String event) {
+                    gateway.trigger(event);
+                }
+            }
+            class OrderGateway {
+                void trigger(String event) {
+                    OrderEvent.valueOf(EventNormalizer.normalize(event));
+                }
+            }
+            class EventNormalizer {
+                static String normalize(String raw) {
+                    return raw.toUpperCase();
+                }
+            }
+            enum OrderEvent { PAY, SHIP }
+            """;
+        Files.writeString(tempDir.resolve("App.java"), source);
+
+        CodebaseContext context = new CodebaseContext();
+        context.setResolveBindings(true);
+        context.scan(tempDir);
+
+        HeuristicCallGraphEngine engine = new HeuristicCallGraphEngine(context);
+        Map<String, List<click.kamil.springstatemachineexporter.analysis.model.CallEdge>> graph = engine.buildCallGraph();
+
+        EntryPoint entryPoint = EntryPoint.builder()
+                .className("com.example.OrderController")
+                .methodName("transition")
+                .name("POST /api/order/{event}")
+                .parameters(List.of(EntryPoint.Parameter.builder()
+                        .name("event")
+                        .type("String")
+                        .annotations(List.of("PathVariable"))
+                        .build()))
+                .build();
+
+        List<Map<String, String>> variants =
+                EntryPointBindingExpander.expandPathVariableBindings(entryPoint, context, graph);
+
+        assertThat(variants).extracting(map -> map.get("event"))
+                .containsExactlyInAnyOrder("PAY", "SHIP");
+    }
+
+    @Test
+    void shouldExpandPathVariableFromSwitchOnCrossClassStaticHelper(@TempDir Path tempDir) throws Exception {
+        String source = """
+            package com.example;
+            public class GenericCommandController {
+                CommandGateway gateway;
+                public void execute(String commandKey) {
+                    gateway.executeViaMapper(commandKey);
+                }
+            }
+            class CommandGateway {
+                StringCommandMapper mapper;
+                void executeViaMapper(String commandKey) {
+                    mapper.fromString(commandKey);
+                }
+            }
+            class StringCommandMapper {
+                DomainCommand fromString(String commandKey) {
+                    return switch (CommandKeys.normalize(commandKey)) {
+                        case "order.pay" -> DomainCommand.ORDER_PAY;
+                        case "order.ship" -> DomainCommand.ORDER_SHIP;
+                        default -> throw new IllegalArgumentException(commandKey);
+                    };
+                }
+            }
+            class CommandKeys {
+                static String normalize(String raw) {
+                    return raw.trim();
+                }
+            }
+            enum DomainCommand { ORDER_PAY, ORDER_SHIP }
+            """;
+        Files.writeString(tempDir.resolve("App.java"), source);
+
+        CodebaseContext context = new CodebaseContext();
+        context.setResolveBindings(true);
+        context.scan(tempDir);
+
+        HeuristicCallGraphEngine engine = new HeuristicCallGraphEngine(context);
+        Map<String, List<click.kamil.springstatemachineexporter.analysis.model.CallEdge>> graph = engine.buildCallGraph();
+
+        EntryPoint entryPoint = EntryPoint.builder()
+                .className("com.example.GenericCommandController")
+                .methodName("execute")
+                .name("POST /api/commands/{commandKey}")
+                .parameters(List.of(EntryPoint.Parameter.builder()
+                        .name("commandKey")
+                        .type("String")
+                        .annotations(List.of("PathVariable"))
+                        .build()))
+                .build();
+
+        List<Map<String, String>> variants =
+                EntryPointBindingExpander.expandPathVariableBindings(entryPoint, context, graph);
+
+        assertThat(variants).extracting(map -> map.get("commandKey"))
+                .containsExactlyInAnyOrder("order.pay", "order.ship");
+    }
 }