Added delete endpoint for rail systems.

src/main/java/nl/andrewl/railsignalapi/rest/RailSystemsApiController.java

@@ -4,6 +4,7 @@ import lombok.RequiredArgsConstructor;
 import nl.andrewl.railsignalapi.rest.dto.RailSystemCreationPayload;
 import nl.andrewl.railsignalapi.rest.dto.RailSystemResponse;
 import nl.andrewl.railsignalapi.service.RailSystemService;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
@@ -23,4 +24,10 @@ public class RailSystemsApiController {
 	public RailSystemResponse createRailSystem(@RequestBody RailSystemCreationPayload payload) {
 		return railSystemService.createRailSystem(payload);
 	}
+
+	@DeleteMapping(path = "/{rsId}")
+	public ResponseEntity<?> deleteRailSystem(@PathVariable long rsId) {
+		railSystemService.delete(rsId);
+		return ResponseEntity.noContent().build();
+	}
 }

src/main/java/nl/andrewl/railsignalapi/service/RailSystemService.java

@@ -1,7 +1,9 @@
 package nl.andrewl.railsignalapi.service;
 
 import lombok.RequiredArgsConstructor;
+import nl.andrewl.railsignalapi.dao.BranchRepository;
 import nl.andrewl.railsignalapi.dao.RailSystemRepository;
+import nl.andrewl.railsignalapi.dao.SignalRepository;
 import nl.andrewl.railsignalapi.model.RailSystem;
 import nl.andrewl.railsignalapi.rest.dto.RailSystemCreationPayload;
 import nl.andrewl.railsignalapi.rest.dto.RailSystemResponse;
@@ -17,6 +19,8 @@ import java.util.List;
 @RequiredArgsConstructor
 public class RailSystemService {
 	private final RailSystemRepository railSystemRepository;
+	private final SignalRepository signalRepository;
+	private final BranchRepository branchRepository;
 
 	@Transactional
 	public List<RailSystemResponse> getRailSystems() {
@@ -31,4 +35,15 @@ public class RailSystemService {
 		RailSystem rs = new RailSystem(payload.name());
 		return new RailSystemResponse(railSystemRepository.save(rs));
 	}
+
+	@Transactional
+	public void delete(long rsId) {
+		var rs = railSystemRepository.findById(rsId)
+				.orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND));
+		var signals = signalRepository.findAllByRailSystemOrderByName(rs);
+		signalRepository.deleteAll(signals);
+		var branches = branchRepository.findAllByRailSystemOrderByName(rs);
+		branchRepository.deleteAll(branches);
+		railSystemRepository.delete(rs);
+	}
 }

src/main/resources/static/js/main.js

@@ -3,6 +3,7 @@ const $ = jQuery;
 let railSystemSelect;
 let railMapCanvas;
 let railSystem = null;
+let detailPanel = null;
 
 let canvasTranslation = {x: 0, y: 0};
 let canvasDragOrigin = null;
@@ -23,6 +24,14 @@ $(document).ready(() => {
     railMapCanvas.mouseup(onCanvasMouseUp);
     railMapCanvas.mousemove(onCanvasMouseMove);
 
+    $('#addRailSystemInput').on("input", () => {
+        $('#addRailSystemButton').prop("disabled", $('#addRailSystemInput').val() === "");
+    });
+    $('#addRailSystemButton').click(addRailSystem);
+    $('#removeRailSystemButton').click(deleteRailSystem);
+
+    detailPanel = $('#railMapDetailPanel');
+
     $.get("/api/railSystems")
         .done(railSystems => {
             railSystems.forEach(railSystem => {
@@ -112,6 +121,7 @@ function getMousePoint(event) {
 }
 
 function railSystemChanged() {
+    detailPanel.empty();
     railSystem = {};
     railSystem.id = railSystemSelect.val();
     $.get("/api/railSystems/" + railSystem.id + "/signals")
@@ -138,10 +148,51 @@ function selectSignalById(id) {
 }
 
 function onSignalSelected(signal) {
-    const dp = $('#railMapDetailPanel');
-    dp.empty();
+    detailPanel.empty();
     if (signal !== null) {
         const tpl = Handlebars.compile($('#signalTemplate').html());
-        dp.html(tpl(signal));
+        detailPanel.html(tpl(signal));
     }
 }
+
+function addRailSystem() {
+    let name = $('#addRailSystemInput').val().trim();
+    $.post({
+        url: "/api/railSystems",
+        data: JSON.stringify({name: name}),
+        contentType: "application/json"
+    })
+        .done((response) => {
+            refreshRailSystems();
+        })
+        .always(() => {
+            $('#addRailSystemInput').val("");
+        });
+}
+
+function deleteRailSystem() {
+    if (railSystem !== null && railSystem.id) {
+        $.ajax({
+            url: "/api/railSystems/" + railSystem.id,
+            type: "DELETE"
+        })
+            .always(() => {
+                refreshRailSystems(true);
+            });
+    }
+}
+
+function refreshRailSystems(selectFirst) {
+    $.get("/api/railSystems")
+        .done(railSystems => {
+            railSystemSelect.empty();
+            railSystems.forEach(railSystem => {
+                let option = $('<option value="' + railSystem.id + '">' + railSystem.name + '</option>')
+                railSystemSelect.append(option);
+            });
+            if (selectFirst) {
+                railSystemSelect.val(railSystems[0].id);
+                railSystemSelect.change();
+            }
+        });
+}

src/main/resources/templates/index.html

@@ -30,7 +30,7 @@
             </div>
         </div>
         <div class="col-auto">
-            <button class="btn btn-danger" type="button" id="removeRailSystemButton" disabled>Remove Selected System</button>
+            <button class="btn btn-danger" type="button" id="removeRailSystemButton">Remove Selected System</button>
         </div>
     </div>