fix #493: add effective access matrix

src/main/java/com/cloudhandson/vpdbackoffice/web/EffectiveMatrixController.java

@@ -0,0 +1,31 @@
+package com.cloudhandson.vpdbackoffice.web;
+
+import com.cloudhandson.vpdbackoffice.domain.effective.EffectiveMatrixView;
+import com.cloudhandson.vpdbackoffice.service.EffectiveMatrixService;
+import java.util.List;
+import org.springframework.dao.DataAccessException;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@Controller
+public class EffectiveMatrixController {
+
+  private final EffectiveMatrixService matrixService;
+
+  public EffectiveMatrixController(EffectiveMatrixService matrixService) {
+    this.matrixService = matrixService;
+  }
+
+  @GetMapping("/effective-matrix")
+  public String matrix(Model model) {
+    try {
+      model.addAttribute("matrix", matrixService.matrix());
+    } catch (DataAccessException e) {
+      RuntimeErrorMessage message = RuntimeErrorMessages.dataAccess(e);
+      model.addAttribute("matrix", new EffectiveMatrixView(List.of(), List.of(), List.of(), 0));
+      model.addAttribute("runtimeError", message);
+    }
+    return "effective-matrix";
+  }
+}