Create an example for #80 that doesn't require library changes.

Author: pdvrieze

examples/src/main/kotlin/net/devrieze/serialization/examples/boxingTag/main.kt

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2025.
+ *
+ * This file is part of xmlutil.
+ *
+ * This file is licenced to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You should have received a copy of the license with the source distribution.
+ * Alternatively, you may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package net.devrieze.serialization.examples.boxingTag
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.builtins.serializer
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.descriptors.buildClassSerialDescriptor
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.encoding.CompositeDecoder
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.encoding.decodeStructure
+import kotlinx.serialization.encoding.encodeStructure
+import nl.adaptivity.xmlutil.serialization.XML
+import nl.adaptivity.xmlutil.serialization.XmlSerialName
+
+/*
+ * This is an example for implementing #80 in a more compact way.
+ */
+
+@Serializable
+class Header(
+    @XmlSerialName("ModelInfo") val modelInfo: BoxedString,
+    @XmlSerialName("ModelVersion") val modelVersion: BoxedString,
+    @XmlSerialName("PersistencyVersion") val persistencyVersion: BoxedString,
+)
+
+fun main() {
+    val data = Header("foo", "bar", "baz")
+
+    println(XML{ recommended_0_90_2()}.encodeToString(data))
+}
+
+typealias BoxedString = @Serializable(BoxedSerializer::class) String
+
+object BoxedSerializer: KSerializer<String> {
+    override val descriptor: SerialDescriptor = buildClassSerialDescriptor(BoxedSerializer::class.qualifiedName!!) {
+        element("value", String.serializer().descriptor)
+    }
+
+    override fun serialize(encoder: Encoder, value: String) {
+        encoder.encodeStructure(descriptor) {
+            encodeStringElement(descriptor, 0, value)
+        }
+    }
+
+    override fun deserialize(decoder: Decoder): String {
+        return decoder.decodeStructure(descriptor) {
+            lateinit var value: String
+            do {
+                when (val i = this.decodeElementIndex(descriptor)) {
+                    CompositeDecoder.DECODE_DONE -> break
+                    0 -> value = decodeStringElement(descriptor, 0)
+                    else -> throw IllegalArgumentException("Unknown index $i")
+                }
+            } while (true)
+            value
+        }
+    }
+}