Styleable and updates to Configuration

build.gradle

@@ -5,7 +5,7 @@ plugins {
 description = "The basic interfaces for DataForge meta-data"
 
 group 'hep.dataforge'
-version '0.1.0-SNAPSHOT'
+version '0.1.1-SNAPSHOT'
 
 repositories {
     mavenCentral()

src/main/kotlin/hep/dataforge/meta/Configuration.kt

@@ -1,5 +1,8 @@
 package hep.dataforge.meta
 
+import hep.dataforge.names.Name
+import hep.dataforge.names.plus
+
 //TODO add validator to configuration
 
 /**
@@ -10,35 +13,25 @@ class Configuration : MutableMetaNode<Configuration>() {
     /**
      * Attach configuration node instead of creating one
      */
-    override fun wrap(meta: Meta): Configuration {
+    override fun wrap(name: Name, meta: Meta): Configuration {
         return meta as? Configuration ?: Configuration().also { builder ->
-            items.mapValues { entry ->
+            meta.items.mapValues { entry ->
                 val item = entry.value
                 builder[entry.key] = when (item) {
                     is MetaItem.ValueItem -> MetaItem.ValueItem(item.value)
-                    is MetaItem.SingleNodeItem -> MetaItem.SingleNodeItem(wrap(item.node))
+                    is MetaItem.SingleNodeItem -> MetaItem.SingleNodeItem(wrap(name + entry.key, item.node))
-                    is MetaItem.MultiNodeItem -> MetaItem.MultiNodeItem(item.nodes.map { wrap(it) })
+                    is MetaItem.MultiNodeItem -> MetaItem.MultiNodeItem(item.nodes.map { wrap(name + entry.key, it) })
                 }
             }
         }
     }
 
-    override fun empty(): Configuration = Configuration()
 
-    /**
+    override fun empty(): Configuration = Configuration()
-     * Universal set method
-     */
-    operator fun set(key: String, value: Any?) {
-        when (value) {
-            null -> remove(key)
-            is Meta -> set(key, value)
-            else -> set(key, Value.of(value))
-        }
-    }
 }
 
 interface Configurable {
     val config: Configuration
 }
 
-open class SimpleConfigurable(override val config:Configuration): Configurable
+open class SimpleConfigurable(override val config: Configuration) : Configurable

src/main/kotlin/hep/dataforge/meta/Delegates.kt

@@ -7,6 +7,8 @@ import kotlin.reflect.KProperty
 
 /* Meta delegates */
 
+//TODO add caching for sealed nodes
+
 class ValueDelegate(private val key: String? = null, private val default: Value? = null) : ReadOnlyProperty<Metoid, Value?> {
     override fun getValue(thisRef: Metoid, property: KProperty<*>): Value? {
         return thisRef.meta[key ?: property.name]?.value ?: default

src/main/kotlin/hep/dataforge/meta/Meta.kt

@@ -38,7 +38,7 @@ operator fun Meta.get(name: Name): MetaItem<out Meta>? {
     return when (name.length) {
         0 -> error("Can't resolve element from empty name")
         1 -> items[name.first()!!.body]
-        else -> name.first()!!.let{ token -> items[token.body]?.nodes?.get(token.query)}?.get(name.cutFirst())
+        else -> name.first()!!.let { token -> items[token.body]?.nodes?.get(token.query) }?.get(name.cutFirst())
     }
 }
 
@@ -48,14 +48,14 @@ operator fun Meta.get(key: String): MetaItem<out Meta>? = get(key.toName())
 /**
  * A meta node that ensures that all of its descendants has at least the same type
  */
-abstract class MetaNode<M: MetaNode<M>>: Meta{
+abstract class MetaNode<M : MetaNode<M>> : Meta {
     abstract override val items: Map<String, MetaItem<M>>
 
     operator fun get(name: Name): MetaItem<M>? {
         return when (name.length) {
             0 -> error("Can't resolve element from empty name")
             1 -> items[name.first()!!.body]
-            else -> name.first()!!.let{ token -> items[token.body]?.nodes?.get(token.query)}?.get(name.cutFirst())
+            else -> name.first()!!.let { token -> items[token.body]?.nodes?.get(token.query) }?.get(name.cutFirst())
         }
     }
 
@@ -87,9 +87,13 @@ class SealedMeta(meta: Meta) : MetaNode<SealedMeta>() {
  */
 fun Meta.seal(): SealedMeta = this as? SealedMeta ?: SealedMeta(this)
 
+object EmptyMeta : Meta {
+    override val items: Map<String, MetaItem<out Meta>> = emptyMap()
+}
+
 /**
  * Generic meta-holder object
  */
-interface Metoid{
+interface Metoid {
     val meta: Meta
 }

src/main/kotlin/hep/dataforge/meta/MetaBuilder.kt

@@ -1,10 +1,12 @@
 package hep.dataforge.meta
 
+import hep.dataforge.names.Name
+
 /**
  * DSL builder for meta. Is not intended to store mutable state
  */
 class MetaBuilder : MutableMetaNode<MetaBuilder>() {
-    override fun wrap(meta: Meta): MetaBuilder = meta.builder()
+    override fun wrap(name: Name, meta: Meta): MetaBuilder = meta.builder()
     override fun empty(): MetaBuilder = MetaBuilder()
 
     infix fun String.to(value: Any) {

src/main/kotlin/hep/dataforge/meta/MutableMetaNode.kt

@@ -10,7 +10,10 @@ class MetaListener(val owner: Any? = null, val action: (name: Name, oldItem: Met
 
 
 interface MutableMeta<M : MutableMeta<M>> : Meta {
+    override val items: Map<String, MetaItem<M>>
     operator fun set(name: Name, item: MetaItem<M>?)
+    fun onChange(owner: Any? = null, action: (Name, MetaItem<*>?, MetaItem<*>?) -> Unit)
+    fun removeListener(owner: Any)
 }
 
 /**
@@ -22,14 +25,14 @@ abstract class MutableMetaNode<M : MutableMetaNode<M>> : MetaNode<M>(), MutableM
     /**
      * Add change listener to this meta. Owner is declared to be able to remove listeners later. Listener without owner could not be removed
      */
-    fun onChange(owner: Any? = null, action: (Name, MetaItem<*>?, MetaItem<*>?) -> Unit) {
+    override fun onChange(owner: Any?, action: (Name, MetaItem<*>?, MetaItem<*>?) -> Unit) {
         listeners.add(MetaListener(owner, action))
     }
 
     /**
      * Remove all listeners belonging to given owner
      */
-    fun removeListener(owner: Any) {
+    override fun removeListener(owner: Any) {
         listeners.removeAll { it.owner === owner }
     }
 
@@ -61,13 +64,15 @@ abstract class MutableMetaNode<M : MutableMetaNode<M>> : MetaNode<M>(), MutableM
 
     /**
      * Transform given meta to node type of this meta tree
+     * @param name the name of the node where meta should be attached. Needed for correct assignment validators and styles
+     * @param meta the node itself
      */
-    protected abstract fun wrap(meta: Meta): M
+    abstract fun wrap(name: Name, meta: Meta): M
 
     /**
      * Create empty node
      */
-    protected abstract fun empty(): M
+    abstract fun empty(): M
 
     override operator fun set(name: Name, item: MetaItem<M>?) {
         when (name.length) {
@@ -87,14 +92,29 @@ abstract class MutableMetaNode<M : MutableMetaNode<M>> : MetaNode<M>(), MutableM
         }
     }
 
-    fun remove(name: String) = set(name.toName(), null)
 
-    operator fun set(name: Name, value: Value) = set(name, MetaItem.ValueItem(value))
+}
-    operator fun set(name: Name, meta: Meta) = set(name, MetaItem.SingleNodeItem(wrap(meta)))
-    operator fun set(name: Name, metas: List<Meta>) = set(name, MetaItem.MultiNodeItem(metas.map { wrap(it) }))
 
-    operator fun set(name: String, item: MetaItem<M>) = set(name.toName(), item)
+fun <M : MutableMeta<M>> M.remove(name: Name) = set(name, null)
-    operator fun set(name: String, value: Value) = set(name.toName(), MetaItem.ValueItem(value))
+fun <M : MutableMeta<M>> M.remove(name: String) = remove(name.toName())
-    operator fun set(name: String, meta: Meta) = set(name.toName(), MetaItem.SingleNodeItem(wrap(meta)))
+
-    operator fun set(name: String, metas: List<Meta>) = set(name.toName(), MetaItem.MultiNodeItem(metas.map { wrap(it) }))
+operator fun <M : MutableMeta<M>> M.set(name: Name, value: Value) = set(name, MetaItem.ValueItem(value))
+operator fun <M : MutableMetaNode<M>> M.set(name: Name, meta: Meta) = set(name, MetaItem.SingleNodeItem(wrap(name, meta)))
+operator fun <M : MutableMetaNode<M>> M.set(name: Name, metas: List<Meta>) = set(name, MetaItem.MultiNodeItem(metas.map { wrap(name, it) }))
+
+operator fun <M : MutableMeta<M>> M.set(name: String, item: MetaItem<M>) = set(name.toName(), item)
+operator fun <M : MutableMeta<M>> M.set(name: String, value: Value) = set(name.toName(), MetaItem.ValueItem(value))
+operator fun <M : MutableMetaNode<M>> M.set(name: String, meta: Meta) = set(name.toName(), meta)
+operator fun <M : MutableMetaNode<M>> M.set(name: String, metas: List<Meta>) = set(name.toName(), metas)
+
+
+/**
+ * Universal set method
+ */
+operator fun <M : MutableMeta<M>> M.set(key: String, value: Any?) {
+    when (value) {
+        null -> remove(key)
+        is Meta -> set(key, value)
+        else -> set(key, Value.of(value))
+    }
 }

src/main/kotlin/hep/dataforge/meta/Styleable.kt

@@ -0,0 +1,58 @@
+package hep.dataforge.meta
+
+import hep.dataforge.names.Name
+
+/**
+ * A configuration decorator with applied style
+ */
+class StyledConfig(val config: Configuration, val style: Meta = EmptyMeta) : MutableMeta<StyledConfig> {
+
+    override fun onChange(owner: Any?, action: (Name, MetaItem<*>?, MetaItem<*>?) -> Unit) {
+        config.onChange(owner, action)
+    }
+
+    override fun removeListener(owner: Any) {
+        config.removeListener(owner)
+    }
+
+    override fun set(name: Name, item: MetaItem<StyledConfig>?) {
+        when (item) {
+            null -> config.remove(name)
+            is MetaItem.ValueItem -> config[name] = item.value
+            is MetaItem.SingleNodeItem -> config[name] = item.node
+            is MetaItem.MultiNodeItem -> config[name] = item.nodes
+        }
+    }
+
+    override val items: Map<String, MetaItem<StyledConfig>>
+        get() = (config.items.keys + style.items.keys).associate { key ->
+            val value = config.items[key]
+            val styleValue = style[key]
+            val item: MetaItem<StyledConfig> = when (value) {
+                null -> when (styleValue) {
+                    null -> error("Should be unreachable")
+                    is MetaItem.ValueItem -> MetaItem.ValueItem(styleValue.value)
+                    is MetaItem.SingleNodeItem -> MetaItem.SingleNodeItem(StyledConfig(config.empty(), styleValue.node))
+                    is MetaItem.MultiNodeItem -> MetaItem.MultiNodeItem(styleValue.nodes.map { StyledConfig(config.empty(), it) })
+                }
+                is MetaItem.ValueItem -> MetaItem.ValueItem(value.value)
+                is MetaItem.SingleNodeItem -> MetaItem.SingleNodeItem(
+                        StyledConfig(value.node, styleValue?.node ?: EmptyMeta)
+                )
+                is MetaItem.MultiNodeItem -> MetaItem.MultiNodeItem(value.nodes.map {
+                    StyledConfig(it, styleValue?.node ?: EmptyMeta)
+                })
+            }
+            key to item
+        }
+}
+
+interface Styleable : Configurable {
+    val styledConfig: StyledConfig
+
+    override val config
+        get() = styledConfig.config
+
+    val style
+        get() = styledConfig.style
+}