GGUF: make GgufMetadata serializable in order to be compatible with Room

examples/llama.android/app/src/main/java/com/example/llama/revamp/data/local/ModelEntity.kt

@@ -2,9 +2,11 @@ package com.example.llama.revamp.data.local
 
 import androidx.room.Entity
 import androidx.room.PrimaryKey
+import androidx.room.TypeConverters
 import com.example.llama.revamp.data.model.ModelInfo
+import com.example.llama.revamp.util.GgufMetadata
+import com.example.llama.revamp.util.GgufMetadataConverters
 
-// TODO-han.yin: Add GgufMetaData
 
 @Entity(tableName = "models")
 data class ModelEntity(
@@ -13,6 +15,8 @@ data class ModelEntity(
     val name: String,
     val path: String,
     val sizeInBytes: Long,
+    @field:TypeConverters(GgufMetadataConverters::class)
+    val metadata: GgufMetadata,
     val dateAdded: Long,
     val lastUsed: Long?
 ) {
@@ -21,6 +25,7 @@ data class ModelEntity(
         name = name,
         path = path,
         sizeInBytes = sizeInBytes,
+        metadata = metadata,
         lastUsed = lastUsed,
     )
 }

examples/llama.android/app/src/main/java/com/example/llama/revamp/data/model/ModelInfo.kt

@@ -1,5 +1,6 @@
 package com.example.llama.revamp.data.model
 
+import com.example.llama.revamp.util.GgufMetadata
 import com.example.llama.revamp.util.formatSize
 
 /**
@@ -10,6 +11,7 @@ data class ModelInfo(
     val name: String,
     val path: String,
     val sizeInBytes: Long,
+    val metadata: GgufMetadata,
     val lastUsed: Long? = null
 ) {
     val formattedSize: String

examples/llama.android/app/src/main/java/com/example/llama/revamp/data/repository/ModelRepository.kt

@@ -192,8 +192,8 @@ class ModelRepositoryImpl @Inject constructor(
                 Log.i(TAG, "Extracting GGUF Metadata from $filePath")
                 GgufMetadataReader().readStructuredMetadata(filePath)
             } catch (e: Exception) {
-                Log.e(TAG, "Failed to extract GGUF metadata: ${e.message}", e)
-                null
+                Log.e(TAG, "Cannot extract GGUF metadata: ${e.message}", e)
+                throw e
             }
 
             // Create model entity and save via DAO
@@ -202,15 +202,11 @@ class ModelRepositoryImpl @Inject constructor(
                 name = fileName.substringBeforeLast('.'),
                 path = modelFile.absolutePath,
                 sizeInBytes = modelFile.length(),
-                // TODO-han.yin: add metadata here
+                metadata = metadata,
                 dateAdded = System.currentTimeMillis(),
                 lastUsed = null
             ).let {
                 modelDao.insertModel(it)
-
-                importJob = null
-                currentModelFile = null
-
                 it.toModelInfo()
             }
 

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/components/ModelCards.kt

@@ -174,41 +174,7 @@ private fun ModelInfoContent(
 
         Spacer(modifier = Modifier.height(4.dp))
 
-        // Model details row (parameters, quantization, size)
-        Row {
-            if (model.parameters != null) {
-                Text(
-                    text = model.parameters,
-                    style = MaterialTheme.typography.bodyMedium,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant
-                )
-            }
-
-            if (model.quantization != null) {
-                Text(
-                    text = " • ${model.quantization}",
-                    style = MaterialTheme.typography.bodyMedium,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant
-                )
-            }
-
-            Text(
-                text = " • ${model.formattedSize}",
-                style = MaterialTheme.typography.bodyMedium,
-                color = MaterialTheme.colorScheme.onSurfaceVariant
-            )
-        }
-
-        Spacer(modifier = Modifier.height(4.dp))
-
-        // Context length
-        if (model.contextLength != null) {
-            Text(
-                text = "Context Length: ${model.contextLength}",
-                style = MaterialTheme.typography.bodySmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant
-            )
-        }
+        // TODO-han.yin: make use of GGUF metadata
 
         // Last used date
         model.lastUsed?.let { lastUsed ->

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/screens/ModelsManagementScreen.kt

@@ -85,7 +85,7 @@ fun ModelsManagementScreen(
                         if (isMultiSelectionMode) {
                             viewModel.toggleModelSelectionById(model.id)
                         } else {
-                            viewModel.viewModelDetails(model.id)
+                            viewModel.viewModelDetails(model)
                         }
                     },
                     modifier = Modifier.padding(bottom = 8.dp),
@@ -95,7 +95,7 @@ fun ModelsManagementScreen(
                         if (!isMultiSelectionMode) {
                             {
                                 ModelCardActions.InfoButton(
-                                    onClick = { viewModel.viewModelDetails(model.id) }
+                                    onClick = { viewModel.viewModelDetails(model) }
                                 )
                             }
                         } else null

examples/llama.android/app/src/main/java/com/example/llama/revamp/util/GgufMetadata.kt

@@ -1,11 +1,15 @@
 package com.example.llama.revamp.util
 
+import androidx.room.TypeConverter
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
 import java.io.IOException
 
 
 /**
  * Structured metadata of GGUF
  */
+@Serializable
 data class GgufMetadata(
     // Basic file info
     val version: GgufVersion,
@@ -69,6 +73,7 @@ data class GgufMetadata(
     val formattedContextLength: String?
         get() = dimensions?.contextLength?.let { "$it tokens" }
 
+    @Serializable
     enum class GgufVersion(val code: Int, val label: String) {
         /** First public draft; little‑endian only, no alignment key. */
         LEGACY_V1(1, "Legacy v1"),
@@ -88,6 +93,7 @@ data class GgufMetadata(
         override fun toString(): String = "$label (code=$code)"
     }
 
+    @Serializable
     data class BasicInfo(
         val uuid: String? = null,
         val name: String? = null,
@@ -95,6 +101,7 @@ data class GgufMetadata(
         val sizeLabel: String? = null,  // Size label like "7B"
     )
 
+    @Serializable
     data class AuthorInfo(
         val organization: String? = null,
         val author: String? = null,
@@ -105,6 +112,7 @@ data class GgufMetadata(
         val licenseLink: String? = null,
     )
 
+    @Serializable
     data class AdditionalInfo(
         val type: String? = null,
         val description: String? = null,
@@ -112,6 +120,7 @@ data class GgufMetadata(
         val languages: List<String>? = null,
     )
 
+    @Serializable
     data class ArchitectureInfo(
         val architecture: String? = null,
         val fileType: Int? = null,
@@ -120,6 +129,7 @@ data class GgufMetadata(
         val quantizationVersion: Int? = null,
     )
 
+    @Serializable
     data class BaseModelInfo(
         val name: String? = null,
         val author: String? = null,
@@ -131,6 +141,7 @@ data class GgufMetadata(
         val repoUrl: String? = null,
     )
 
+    @Serializable
     data class TokenizerInfo(
         val model: String? = null,
         val bosTokenId: Int? = null,
@@ -142,6 +153,7 @@ data class GgufMetadata(
         val chatTemplate: String? = null,
     )
 
+    @Serializable
     data class DimensionsInfo(
         val contextLength: Int? = null,
         val embeddingSize: Int? = null,
@@ -149,6 +161,7 @@ data class GgufMetadata(
         val feedForwardSize: Int? = null,
     )
 
+    @Serializable
     data class AttentionInfo(
         val headCount: Int? = null,
         val headCountKv: Int? = null,
@@ -158,6 +171,7 @@ data class GgufMetadata(
         val layerNormRmsEpsilon: Float? = null,
     )
 
+    @Serializable
     data class RopeInfo(
         val frequencyBase: Float? = null,
         val dimensionCount: Int? = null,
@@ -168,12 +182,25 @@ data class GgufMetadata(
         val finetuned: Boolean? = null,
     )
 
+    @Serializable
     data class ExpertsInfo(
         val count: Int? = null,
         val usedCount: Int? = null,
     )
 }
 
+class GgufMetadataConverters {
+    private val json = Json { encodeDefaults = false; ignoreUnknownKeys = true }
+
+    @TypeConverter
+    fun toJson(value: GgufMetadata?): String? =
+        value?.let { json.encodeToString(GgufMetadata.serializer(), it) }
+
+    @TypeConverter
+    fun fromJson(value: String?): GgufMetadata? =
+        value?.let { json.decodeFromString(GgufMetadata.serializer(), it) }
+}
+
 /**
  * Numerical codes used by `general.file_type` (see llama.cpp repo's `constants.py`).
  * The `label` matches what llama‑cli prints.

examples/llama.android/app/src/main/java/com/example/llama/revamp/viewmodel/ModelsManagementViewModel.kt

@@ -2,6 +2,7 @@ package com.example.llama.revamp.viewmodel
 
 import android.content.Context
 import android.net.Uri
+import android.util.Log
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.example.llama.revamp.data.model.ModelInfo
@@ -126,8 +127,9 @@ class ModelsManagementViewModel @Inject constructor(
         _managementState.value = ModelManagementState.Idle
     }
 
-    fun viewModelDetails(modelId: String) {
-        // TODO-han.yin: Stub for now. Would navigate to model details screen or show dialog
+    fun viewModelDetails(model: ModelInfo) {
+        // TODO-han.yin: print logs for now. Would navigate to model details screen or show dialog
+        Log.i(TAG, "${model.name} metadata: \n" + model.metadata.toString())
     }
 
     /**