Make ExposedThingBuilder able to handle link annotations.

kotlin-wot-integration-tests/src/main/kotlin/integration/ChatAgent.kt

@@ -25,6 +25,7 @@ import org.springframework.stereotype.Component
 @Thing(id="chatagent", title="Chat Agent",
     description="A chat agent.", type= LMOSThingType.AGENT)
 @Context(prefix = LMOSContext.prefix, url = LMOSContext.url)
+@Link(href = "lmos/capabilities", rel = "service-meta", type = "application/json")
 @VersionInfo(instance = "1.0.0")
 @Component
 class ChatAgent(agentProvider: AgentProvider, @Property(readOnly = true)

kotlin-wot-reflection/src/main/kotlin/reflection/ExposedThingBuilder.kt

@@ -4,6 +4,7 @@ import ai.ancf.lmos.wot.JsonMapper
 import ai.ancf.lmos.wot.Wot
 import ai.ancf.lmos.wot.reflection.annotations.*
 import ai.ancf.lmos.wot.reflection.annotations.Context
+import ai.ancf.lmos.wot.reflection.annotations.Link
 import ai.ancf.lmos.wot.reflection.annotations.VersionInfo
 import ai.ancf.lmos.wot.thing.DEFAULT_CONTEXT
 import ai.ancf.lmos.wot.thing.ExposedThing
@@ -77,6 +78,26 @@ object ExposedThingBuilder {
                 if(versionInfoAnnotation != null){
                     version = ai.ancf.lmos.wot.thing.schema.VersionInfo(versionInfoAnnotation.instance, versionInfoAnnotation.model)
                 }
+                clazz.findAnnotation<Link>()?.let { linkAnnotation ->
+                    links.add(ai.ancf.lmos.wot.thing.schema.Link(
+                        href = linkAnnotation.href,
+                        type = linkAnnotation.type,
+                        rel = linkAnnotation.rel,
+                        anchor = linkAnnotation.anchor,
+                        sizes = linkAnnotation.sizes,
+                        hreflang = linkAnnotation.hreflang.toList()
+                    ))
+                }
+                clazz.findAnnotation<Links>()?.values?.forEach { linkAnnotation ->
+                    links.add(ai.ancf.lmos.wot.thing.schema.Link(
+                        href = linkAnnotation.href,
+                        type = linkAnnotation.type,
+                        rel = linkAnnotation.rel,
+                        anchor = linkAnnotation.anchor,
+                        sizes = linkAnnotation.sizes,
+                        hreflang = linkAnnotation.hreflang.toList()
+                    ))
+                }
                 // 3. Inspect the properties of the class and find @Property annotations
                 clazz.memberProperties.forEach { property ->
                     val propertyAnnotation = property.findAnnotation<Property>()

kotlin-wot-reflection/src/main/kotlin/reflection/annotations/Annotations.kt

@@ -15,6 +15,21 @@ annotation class Context(val prefix: String, val url : String)
 @Retention(AnnotationRetention.RUNTIME)
 annotation class VersionInfo(val instance : String, val model : String = "")
 
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+annotation class Link(
+    val href: String,
+    val type: String = "",
+    val rel: String = "",
+    val anchor: String = "",
+    val sizes: String = "",
+    val hreflang: Array<String> = []
+)
+
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+annotation class Links(val values: Array<Link>)
+
 @Target(AnnotationTarget.PROPERTY, AnnotationTarget.VALUE_PARAMETER, AnnotationTarget.TYPE_PARAMETER)
 @Retention(AnnotationRetention.RUNTIME)
 annotation class Property(val title: String = "", val description: String = "", val readOnly: Boolean = false, val writeOnly: Boolean = false)

kotlin-wot-reflection/src/test/kotlin/reflection/ComplexThingTest.kt

@@ -35,6 +35,7 @@ class ComplexThingTest {
         assertEquals("Complex Thing", thingDescription.title, "ThingDescription title should match")
         assertEquals("A thing with complex properties, actions, and events.", thingDescription.description, "ThingDescription description should match")
         assertEquals("1.0.0", thingDescription.version?.instance)
+        assertEquals(listOf(Link("my/link", "my/type", "my-rel", "my-anchor", "my-sizes", listOf("my-lang-1", "my-lang-2"))), thingDescription.links)
     }
 
     @Test

kotlin-wot-reflection/src/test/kotlin/reflection/SimpleThingTest.kt

@@ -8,7 +8,9 @@ import ai.ancf.lmos.wot.content.toJsonContent
 import ai.ancf.lmos.wot.reflection.things.SimpleThing
 import ai.ancf.lmos.wot.thing.ExposedThing
 import ai.ancf.lmos.wot.thing.schema.ContentListener
+import ai.ancf.lmos.wot.thing.schema.Link
 import ai.ancf.lmos.wot.thing.schema.StringSchema
+import ai.ancf.lmos.wot.thing.schema.WoTThingDescription
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.test.runTest
 import java.util.concurrent.CountDownLatch
@@ -21,6 +23,7 @@ class SimpleThingTest {
     lateinit var wot: Wot
     lateinit var simpleThing: SimpleThing
     lateinit var exposedThing: ExposedThing
+    lateinit var thingDescription: WoTThingDescription
 
     @BeforeTest
     fun setUp() = runTest {
@@ -35,11 +38,22 @@ class SimpleThingTest {
 
         // Generate ThingDescription from the class
         exposedThing = ExposedThingBuilder.createExposedThing(wot, simpleThing, SimpleThing::class) as ExposedThing
+        thingDescription = exposedThing.getThingDescription()
 
         servient.addThing(exposedThing)
         servient.expose("simpleThing")
     }
 
+    @Test
+    fun `test ThingDescription creation for SimpleThing`() {
+        // Validate Thing metadata
+        assertEquals("simpleThing", thingDescription.id, "ThingDescription ID should match the class ID")
+        assertEquals("Simple Thing", thingDescription.title, "ThingDescription title should match")
+        assertEquals("A thing with complex properties, actions, and events.", thingDescription.description, "ThingDescription description should match")
+        assertEquals("1.0.0", thingDescription.version?.instance)
+        assertEquals(listOf(Link("my/link", "my/type", "my-rel", "my-anchor", "my-sizes", listOf("my-lang-1", "my-lang-2"))), thingDescription.links)
+    }
+
     @Test
     fun `Read mutable property`() = runTest {
         val content = exposedThing.handleReadProperty("mutableProperty")

kotlin-wot-reflection/src/test/kotlin/reflection/things/ComplexThing.kt

@@ -13,6 +13,16 @@ import kotlin.random.Random
     title = "Complex Thing",
     description = "A thing with complex properties, actions, and events."
 )
+@Links(
+    values = [Link(
+        href = "my/link",
+        rel = "my-rel",
+        type = "my/type",
+        anchor = "my-anchor",
+        sizes = "my-sizes",
+        hreflang = ["my-lang-1", "my-lang-2"]
+    )]
+)
 @VersionInfo(instance = "1.0.0")
 class ComplexThing(@Property(readOnly = true) val constructorProperty: String = "Hello World") {
 

kotlin-wot-reflection/src/test/kotlin/reflection/things/SimpleThing.kt

@@ -10,6 +10,14 @@ import kotlinx.coroutines.flow.flow
     title = "Simple Thing",
     description = "A thing with complex properties, actions, and events."
 )
+@Link(
+    href = "my/link",
+    rel = "my-rel",
+    type = "my/type",
+    anchor = "my-anchor",
+    sizes = "my-sizes",
+    hreflang = ["my-lang-1", "my-lang-2"]
+)
 @VersionInfo(instance = "1.0.0")
 class SimpleThing {
 

kotlin-wot/src/main/kotlin/thing/ThingDescription.kt

@@ -74,7 +74,7 @@ data class ThingDescription @JsonCreator constructor(
     @JsonInclude(NON_EMPTY) override var created: String? = null,
     @JsonInclude(NON_EMPTY) override var modified: String? = null,
     @JsonInclude(NON_EMPTY) override var support: String? = null,
-    @JsonInclude(NON_EMPTY) override var links: List<Link>? = null,
+    @JsonInclude(NON_EMPTY) override var links: MutableList<Link> = mutableListOf(),
     @JsonFormat(with = [JsonFormat.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY]) @JsonInclude(NON_EMPTY) override var profile: List<String>? = null,
     @JsonInclude(NON_EMPTY) override var schemaDefinitions: MutableMap<String, DataSchema<Any>>? = null,
     @JsonInclude(NON_EMPTY) override var uriVariables: MutableMap<String, DataSchema<Any>>? = null

kotlin-wot/src/main/kotlin/thing/schema/WoTThingDescription.kt

@@ -103,7 +103,7 @@ interface WoTThingDescription : BaseSchema {
      * @return an array of links.
      */
     @get:JsonInclude(JsonInclude.Include.NON_EMPTY)
-    var links: List<Link>? // Optional: Array of Link
+    var links: MutableList<Link> // Optional: Array of Link
 
     /**
      * Set of form hypermedia controls that describe how an operation can be performed.