Optimized generics added jvm module for tests

dataforge-meta-jvm/build.gradle

@@ -0,0 +1,27 @@
+plugins {
+    id 'kotlin-platform-jvm'
+}
+
+group 'hep.dataforge'
+version '0.1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    expectedBy rootProject
+
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+    testCompile "junit:junit:4.12"
+    testCompile "org.jetbrains.kotlin:kotlin-test"
+    testCompile "org.jetbrains.kotlin:kotlin-test-junit"
+}
+
+compileKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}
+compileTestKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}
+sourceCompatibility = "1.8"

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

@@ -0,0 +1,23 @@
+package hep.dataforge.meta
+
+//TODO add validator to configuration
+
+class Configuration: MutableMetaNode<Configuration>() {
+    /**
+     * Attach configuration node instead of creating one
+     */
+    override fun wrap(meta: Meta): Configuration {
+        return meta as? Configuration ?: Configuration().also { builder ->
+            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.MultiNodeItem -> MetaItem.MultiNodeItem(item.nodes.map { wrap(it) })
+                }
+            }
+        }
+    }
+
+    override fun empty(): Configuration = Configuration()
+}

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

@@ -1,7 +1,6 @@
 package hep.dataforge.meta
 
 import hep.dataforge.names.Name
-import hep.dataforge.names.NameToken
 import hep.dataforge.names.toName
 
 /**
@@ -10,13 +9,13 @@ import hep.dataforge.names.toName
  * * a single node
  * * a list of nodes
  */
-sealed class MetaItem<M : Meta<M>> {
+sealed class MetaItem<M : Meta> {
-    class ValueItem<M : Meta<M>>(val value: Value) : MetaItem<M>()
+    class ValueItem<M : Meta>(val value: Value) : MetaItem<M>()
-    class SingleNodeItem<M : Meta<M>>(val node: M) : MetaItem<M>()
+    class SingleNodeItem<M : Meta>(val node: M) : MetaItem<M>()
-    class MultiNodeItem<M : Meta<M>>(val nodes: List<M>) : MetaItem<M>()
+    class MultiNodeItem<M : Meta>(val nodes: List<M>) : MetaItem<M>()
 }
 
-operator fun <M : Meta<M>> List<M>.get(query: String): M? {
+operator fun <M : Meta> List<M>.get(query: String): M? {
     return if (query.isEmpty()) {
         first()
     } else {
@@ -31,8 +30,26 @@ operator fun <M : Meta<M>> List<M>.get(query: String): M? {
  *  * [MetaItem.SingleNodeItem] single node
  *  * [MetaItem.MultiNodeItem] multi-value node
  */
-interface Meta<M : Meta<M>> {
+interface Meta {
-    val items: Map<String, MetaItem<M>>
+    val items: Map<String, MetaItem<out Meta>>
+}
+
+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())
+    }
+}
+
+//TODO create Java helper for meta operations
+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 override val items: Map<String, MetaItem<M>>
 
     operator fun get(name: Name): MetaItem<M>? {
         return when (name.length) {
@@ -50,7 +67,7 @@ interface Meta<M : Meta<M>> {
  *
  * If the argument is possibly mutable node, it is copied on creation
  */
-class SealedMeta(meta: Meta<*>) : Meta<SealedMeta> {
+class SealedMeta(meta: Meta) : MetaNode<SealedMeta>() {
     override val items: Map<String, MetaItem<SealedMeta>> = if (meta is SealedMeta) {
         meta.items
     } else {
@@ -68,4 +85,4 @@ class SealedMeta(meta: Meta<*>) : Meta<SealedMeta> {
 /**
  * Generate sealed node from [this]. If it is already sealed return it as is
  */
-fun Meta<*>.seal(): SealedMeta = this as? SealedMeta ?: SealedMeta(this)
+fun Meta.seal(): SealedMeta = this as? SealedMeta ?: SealedMeta(this)

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

@@ -3,8 +3,8 @@ package hep.dataforge.meta
 /**
  * DSL builder for meta
  */
-class MetaBuilder : MutableMeta<MetaBuilder>() {
+class MetaBuilder : MutableMetaNode<MetaBuilder>() {
-    override fun wrap(meta: Meta<*>): MetaBuilder = meta.builder()
+    override fun wrap(meta: Meta): MetaBuilder = meta.builder()
     override fun empty(): MetaBuilder = MetaBuilder()
 
     infix fun String.to(value: Any) {
@@ -19,7 +19,7 @@ class MetaBuilder : MutableMeta<MetaBuilder>() {
 /**
  * For safety, builder always copies the initial meta even if it is builder itself
  */
-fun Meta<*>.builder(): MetaBuilder {
+fun Meta.builder(): MetaBuilder {
     return MetaBuilder().also { builder ->
         items.mapValues { entry ->
             val item = entry.value
@@ -30,4 +30,6 @@ fun Meta<*>.builder(): MetaBuilder {
             }
         }
     }
-}
+}
+
+fun buildMeta(builder: MetaBuilder.() -> Unit): Meta = MetaBuilder().apply(builder)

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

@@ -13,7 +13,7 @@ val MetaItem<*>.double get() = number.toDouble()
 val MetaItem<*>.int get() = number.toInt()
 val MetaItem<*>.long get() = number.toLong()
 
-val <M : Meta<M>> MetaItem<M>.node: M
+val <M : Meta> MetaItem<M>.node: M
     get() = when (this) {
         is MetaItem.ValueItem -> error("Trying to interpret value meta item as node item")
         is MetaItem.SingleNodeItem -> node
@@ -24,14 +24,14 @@ val <M : Meta<M>> MetaItem<M>.node: M
  * Utility method to access item content as list of nodes.
  * Returns empty list if it is value item.
  */
-val <M : Meta<M>> MetaItem<M>.nodes: List<M>
+val <M : Meta> MetaItem<M>.nodes: List<M>
     get() = when (this) {
         is MetaItem.ValueItem -> emptyList()//error("Trying to interpret value meta item as node item")
         is MetaItem.SingleNodeItem -> listOf(node)
         is MetaItem.MultiNodeItem -> nodes
     }
 
-fun <M : Meta<M>> MetaItem<M>.indexOf(meta: M): Int {
+fun <M : Meta> MetaItem<M>.indexOf(meta: M): Int {
     return when (this) {
         is MetaItem.ValueItem -> -1
         is MetaItem.SingleNodeItem -> if (node == meta) 0 else -1

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

@@ -8,10 +8,15 @@ class MetaListener(val owner: Any? = null, val action: (name: Name, oldItem: Met
     operator fun invoke(name: Name, oldItem: MetaItem<*>?, newItem: MetaItem<*>?) = action(name, oldItem, newItem)
 }
 
+
+interface MutableMeta<M : MutableMeta<M>>: Meta{
+    operator fun set(name: Name, item: MetaItem<M>)
+}
+
 /**
  * A mutable meta node with attachable change listener
  */
-abstract class MutableMeta<M : MutableMeta<M>> : Meta<M> {
+abstract class MutableMetaNode<M : MutableMetaNode<M>> : MetaNode<M>(), MutableMeta<M> {
     private val listeners = HashSet<MetaListener>()
 
     /**
@@ -57,14 +62,14 @@ abstract class MutableMeta<M : MutableMeta<M>> : Meta<M> {
     /**
      * Transform given meta to node type of this meta tree
      */
-    protected abstract fun wrap(meta: Meta<*>): M
+    protected abstract fun wrap(meta: Meta): M
 
     /**
      * Create empty node
      */
     protected abstract fun empty(): M
 
-    operator fun set(name: Name, item: MetaItem<M>) {
+    override operator fun set(name: Name, item: MetaItem<M>) {
         when (name.length) {
             0 -> error("Can't set meta item for empty name")
             1 -> {
@@ -83,11 +88,11 @@ abstract class MutableMeta<M : MutableMeta<M>> : Meta<M> {
     }
 
     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, 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: Name, metas: List<Meta>) = set(name, MetaItem.MultiNodeItem(metas.map { wrap(it) }))
 
     operator fun set(name: String, item: MetaItem<M>) = set(name.toName(), item)
     operator fun set(name: String, value: Value) = set(name.toName(), MetaItem.ValueItem(value))
-    operator fun set(name: String, meta: Meta<*>) = set(name.toName(), MetaItem.SingleNodeItem(wrap(meta)))
+    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 set(name: String, metas: List<Meta>) = set(name.toName(), MetaItem.MultiNodeItem(metas.map { wrap(it) }))
 }

src/main/kotlin/hep/dataforge/names/Name.kt

@@ -65,7 +65,11 @@ data class NameToken internal constructor(val body: String, val query: String) {
         if (body.isEmpty()) error("Syntax error: Name token body is empty")
     }
 
-    override fun toString(): String = "$body[$query]"
+    override fun toString(): String = if (hasQuery()) {
+        "$body[$query]"
+    } else {
+        body
+    }
 
     fun hasQuery() = query.isNotEmpty()
 }

src/test/kotlin/hep/dataforge/meta/MetaBuilderTest.kt

@@ -0,0 +1,25 @@
+package hep.dataforge.meta
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+
+class MetaBuilderTest{
+    @Test
+    fun testBuilder(){
+        val meta = buildMeta {
+            "a" to 22
+            "b" to listOf(1,2,3)
+            this["c"] = "myValue".asValue()
+            "node" to {
+                "e" to 12.2
+                "childNode" to {
+                    "f" to true
+                }
+            }
+        }
+        assertEquals(12.2, meta["node.e"]?.double)
+        assertEquals(true, meta["node.childNode.f"]?.boolean)
+    }
+
+}

src/test/kotlin/hep/dataforge/names/NameTest.kt

@@ -7,6 +7,6 @@ class NameTest{
     @Test
     fun simpleName(){
         val name = "token1.token2.token3".toName()
-        assertEquals("token2", name[2].toString())
+        assertEquals("token2", name[1].toString())
     }
 }