Can show an asset

src/main/java/be/seeseepuff/pcinv/controllers/WebController.java

@@ -24,6 +24,7 @@ public class WebController {
     private static final String DESCRIPTORS = "descriptors";
     /// The name of the model attribute that holds the asset descriptor for the current view.
     private static final String DESCRIPTOR = "descriptor";
+    private static final String GENERIC_DESCRIPTOR = "generic";
 
     private final AssetService assetService;
 
@@ -37,6 +38,23 @@ public class WebController {
         return "index";
     }
 
+    /**
+     * Handles the view of an asset by its QR code.
+     * If the asset does not exist, it redirects to the index page.
+     *
+     * @param qr    The QR code of the asset to view.
+     */
+    @GetMapping("/view/{qr}")
+    public String view(Model model, @PathVariable long qr) {
+        var asset = assetService.getAssetByQr(qr);
+        if (asset == null) {
+            return "redirect:/";
+        }
+        model.addAttribute("asset", asset);
+        model.addAttribute(DESCRIPTORS, assetService.getAssetDescriptorTree(asset.getAsset().getType()));
+        return "view";
+    }
+
     /**
      * Shows a view where the user can create the type of asset to create.
      */

src/main/java/be/seeseepuff/pcinv/meta/AssetDescriptor.java

@@ -46,7 +46,7 @@ public class AssetDescriptor {
                 .displayName(assetInfo.displayName())
                 .visible(assetInfo.isVisible())
                 .properties(Arrays.stream(assetType.getDeclaredFields())
-                        .map(AssetProperty::loadFrom)
+                        .map(field -> AssetProperty.loadFrom(field, assetInfo.type()))
                         .filter(Objects::nonNull)
                         .toList());
         if (Asset.class.isAssignableFrom(assetType)) {

src/main/java/be/seeseepuff/pcinv/meta/AssetProperty.java

@@ -1,6 +1,9 @@
 package be.seeseepuff.pcinv.meta;
 
+import be.seeseepuff.pcinv.models.Asset;
 import be.seeseepuff.pcinv.models.AssetCondition;
+import be.seeseepuff.pcinv.models.GenericAsset;
+import jakarta.annotation.Nonnull;
 import jakarta.annotation.Nullable;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
@@ -10,6 +13,7 @@ import lombok.Singular;
 import java.lang.reflect.Field;
 import java.util.List;
 import java.util.function.BiConsumer;
+import java.util.function.Function;
 
 /**
  * Represents a property of an asset, such as its name or type.
@@ -35,6 +39,8 @@ public class AssetProperty {
     private final boolean capacityAsIEC;
     /// A setter function that can be used to set the value of the property on an asset.
     private final BiConsumer<Object, Object> setter;
+    /// A getter function that can be used to get the value of the property from an asset.
+    private final Function<Object, Object> getter;
 
     /**
      * Enum representing the possible types of asset properties.
@@ -66,7 +72,7 @@ public class AssetProperty {
      * @return An AssetProperty instance with the name, display name, and type determined from the field.
      */
     @Nullable
-    public static AssetProperty loadFrom(Field property) {
+    public static AssetProperty loadFrom(Field property, @Nonnull  String assetType) {
         var annotation = property.getAnnotation(Property.class);
         if (annotation == null) {
             return null;
@@ -85,6 +91,17 @@ public class AssetProperty {
                     } catch (IllegalAccessException e) {
                         throw new RuntimeException(e);
                     }
+                })
+                .getter(obj -> {
+                    try {
+                        if (assetType.equals(GenericAsset.TYPE) && obj instanceof Asset asset) {
+                            obj = asset.getAsset();
+                        }
+                        property.setAccessible(true);
+                        return property.get(obj);
+                    } catch (IllegalAccessException e) {
+                        throw new RuntimeException(e);
+                    }
                 });
 
         if (type.isEnum) {
@@ -144,6 +161,39 @@ public class AssetProperty {
         setter.accept(asset, value);
     }
 
+    /**
+     * Gets the value of the property from the given asset.
+     *
+     * @param asset The asset to get the property value from.
+     * @return The value of the property.
+     */
+    public Object getValue(Object asset) {
+        return getter.apply(asset);
+    }
+
+    /**
+     * Renders the value of the property as a string.
+     *
+     * @return The rendered value as a string.
+     */
+    public String renderValue(Object asset) {
+        var value = getValue(asset);
+        if (value == null) {
+            return "Unknown";
+        } else if (type == Type.INTEGER || type == Type.STRING) {
+            return value.toString();
+        } else if (type == Type.CAPACITY) {
+            return String.format("%s bytes", value);
+        } else if (type.isEnum) {
+            if (value instanceof AssetEnum assetEnum) {
+                return assetEnum.getDisplayName();
+            }
+            throw new IllegalArgumentException("Expected value to be an instance of AssetEnum, but got: " + value.getClass().getName());
+        } else {
+            return value.toString();
+        }
+    }
+
     @Override
     public String toString() {
         var enumOptions = "";

src/main/java/be/seeseepuff/pcinv/models/GenericAsset.java

@@ -23,6 +23,8 @@ import lombok.Setter;
 @Table(name = "assets")
 public class GenericAsset
 {
+	public static final String TYPE = "asset";
+
 	@Id @GeneratedValue
 	private long id;
 
@@ -30,6 +32,9 @@ public class GenericAsset
 	@Property(value = "QR", required = true)
 	private long qr;
 
+	/// The type of asset
+	private String type;
+
 	/// The brand of the asset.
 	@Property("Brand")
 	private String brand;

src/main/java/be/seeseepuff/pcinv/repositories/AssetRepository.java

@@ -1,6 +1,7 @@
 package be.seeseepuff.pcinv.repositories;
 
 import be.seeseepuff.pcinv.models.Asset;
+import be.seeseepuff.pcinv.models.GenericAsset;
 import org.springframework.stereotype.Repository;
 
 @Repository
@@ -16,6 +17,8 @@ public interface AssetRepository<T extends Asset> {
         }
     }
 
+    T findByAsset(GenericAsset asset);
+
     Class<T> getAssetType();
 
     long count();

src/main/java/be/seeseepuff/pcinv/repositories/GenericAssetRepository.java

@@ -5,4 +5,5 @@ import org.springframework.data.jpa.repository.JpaRepository;
 
 @SuppressWarnings("unused")
 public interface GenericAssetRepository extends JpaRepository<GenericAsset, Long> {
+    GenericAsset findByQr(long qr);
 }

src/main/java/be/seeseepuff/pcinv/services/AssetService.java

@@ -35,6 +35,21 @@ public class AssetService {
         return genericRepository.count();
     }
 
+    /**
+     * Retrieves an asset by its QR code.
+     *
+     * @param qr the QR code of the asset to retrieve
+     * @return the Asset associated with the given QR code
+     * @throws IllegalArgumentException if no asset is found with the given QR code
+     */
+    public Asset getAssetByQr(long qr) {
+        var genericAsset = genericRepository.findByQr(qr);
+        if (genericAsset == null) {
+            throw new IllegalArgumentException("No asset found with QR code: " + qr);
+        }
+        return getRepositoryFor(genericAsset.getType()).findByAsset(genericAsset);
+    }
+
     /**
      * Retrieves the global asset descriptors for all asset types.
      *
@@ -69,10 +84,10 @@ public class AssetService {
      * @return a list of AssetDescriptors for the specified type
      */
     public List<AssetDescriptor> getAssetDescriptorTree(String type) {
-        if (type.equals("asset")) {
-            return List.of(getAssetDescriptor("asset"));
+        if (type.equals(GenericAsset.TYPE)) {
+            return List.of(getAssetDescriptor(GenericAsset.TYPE));
         }
-        return List.of(getAssetDescriptor("asset"), getAssetDescriptor(type));
+        return List.of(getAssetDescriptor(GenericAsset.TYPE), getAssetDescriptor(type));
     }
 
     /**
@@ -84,10 +99,11 @@ public class AssetService {
      */
     @Transactional
     public Asset createAsset(String type, Map<String, String> formData) {
-        var genericDescriptor = getAssetDescriptor("asset");
+        var genericDescriptor = getAssetDescriptor(GenericAsset.TYPE);
         var assetDescriptor = getAssetDescriptor(type);
 
         var genericAsset = new GenericAsset();
+        genericAsset.setType(type);
         fillIn(genericAsset, genericDescriptor, formData);
 
         var asset = assetDescriptor.newInstance();

src/main/resources/templates/fragments.html

@@ -4,7 +4,12 @@
     <title>PC Inventory</title>
 </head>
 <body>
-<h1>PC Inventory - <span th:text="${title}"></span></h1>
+<h1>PC Inventory - <span th:text="${title}"></span>
+</h1>
+<hr>
+    <a href="/">Home</a>
+    <a href="/browse">Browse</a>
+    <a href="/create">Create</a>
 <hr>
 <div th:replace="${content}">
 </div>

src/main/resources/templates/index.html

@@ -1,6 +1,5 @@
 <div th:replace="fragments :: base(title='Home', content=~{::content})">
 	<div th:fragment="content">
-		<a href="/create">Create a new device</a>
 		<p>This system holds <span th:text="${asset_count}">5</span> assets.</p>
 	</div>
 </div>

src/main/resources/templates/view.html

@@ -0,0 +1,14 @@
+<body th:replace="~{fragments :: base(title='Select type to create', content=~{::content})}">
+<div th:fragment="content">
+  View device details
+  <div th:each="d : ${descriptors}">
+    <h2 th:text="${d.displayName}"></h2>
+    <table border="1">
+      <tr th:each="p : ${d.properties}">
+        <td><b th:text="${p.displayName}"></b></td>
+        <td th:text="${p.renderValue(asset)}"></td>
+      </tr>
+    </table>
+  </div>
+</div>
+</body>