block property iteration and unpacking

src/integration-test/kotlin/de/bixilon/minosoft/data/registries/blocks/properties/list/MapPropertyListTest.kt

@@ -0,0 +1,58 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020-2023 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.data.registries.blocks.properties.list
+
+import de.bixilon.minosoft.data.direction.Directions
+import de.bixilon.minosoft.data.registries.blocks.properties.EnumProperty
+import de.bixilon.minosoft.data.registries.blocks.properties.primitives.BooleanProperty
+import org.testng.Assert.assertEquals
+import org.testng.annotations.Test
+
+@Test(groups = ["blocks"])
+class MapPropertyListTest {
+
+    fun `unpacking single boolean property`() {
+        val list = MapPropertyList()
+        val property = BooleanProperty("test")
+        list += property
+        assertEquals(list.unpack().toSet(), setOf(mapOf(property to false), mapOf(property to true)))
+    }
+
+    fun `unpacking single enum property`() {
+        val list = MapPropertyList()
+        val property = EnumProperty("test", Directions)
+        list += property
+        assertEquals(list.unpack().toSet(), setOf(
+            mapOf(property to Directions.DOWN),
+            mapOf(property to Directions.UP),
+            mapOf(property to Directions.NORTH),
+            mapOf(property to Directions.SOUTH),
+            mapOf(property to Directions.WEST),
+            mapOf(property to Directions.EAST),
+        ))
+    }
+
+    fun `unpacking 2 boolean properties`() {
+        val list = MapPropertyList()
+        val a = BooleanProperty("a")
+        val b = BooleanProperty("b")
+        list += a; list += b
+        assertEquals(list.unpack().toSet(), setOf(
+            mapOf(a to false, b to false),
+            mapOf(a to false, b to true),
+            mapOf(a to true, b to false),
+            mapOf(a to true, b to true),
+        ))
+    }
+}

src/main/java/de/bixilon/minosoft/data/registries/blocks/properties/BlockProperties.kt

@@ -22,6 +22,7 @@ import de.bixilon.minosoft.data.registries.blocks.types.Block
 import de.bixilon.minosoft.data.registries.blocks.types.building.dirt.SnowyBlock
 import de.bixilon.minosoft.data.registries.blocks.types.building.snow.SnowLayerBlock
 import de.bixilon.minosoft.data.registries.blocks.types.fluid.FluidBlock
+import java.util.*
 
 @Deprecated("Fallback data")
 object BlockProperties {
@@ -117,6 +118,7 @@ object BlockProperties {
 
     val AXIS = EnumProperty("axis", Axes).register()
     val FACING = EnumProperty("facing", Directions).register()
+    val FACING_HORIZONTAL = EnumProperty("facing", Directions, EnumSet.of(Directions.NORTH, Directions.SOUTH, Directions.WEST, Directions.EAST))
     val ROTATION = IntProperty("rotation").register()
     val ORIENTATION = EnumProperty("orientation", Orientations).register()
 

src/main/java/de/bixilon/minosoft/data/registries/blocks/properties/BlockProperty.kt

@@ -16,7 +16,7 @@ package de.bixilon.minosoft.data.registries.blocks.properties
 
 abstract class BlockProperty<T>(
     val name: String,
-) {
+) : Iterable<T> {
 
     override fun toString(): String {
         return name

src/main/java/de/bixilon/minosoft/data/registries/blocks/properties/EnumProperty.kt

@@ -17,8 +17,8 @@ import de.bixilon.kutil.enums.ValuesEnum
 
 class EnumProperty<T : Enum<*>>(
     name: String,
-    private val values: ValuesEnum<T>,
+    val values: ValuesEnum<T>,
-    private val allowed: Set<T>? = null,
+    val allowed: Set<T>? = null,
 ) : BlockProperty<T>(name) {
 
     override fun parse(value: Any): T {
@@ -36,4 +36,8 @@ class EnumProperty<T : Enum<*>>(
         if (other.name != name) return false
         return other.values == values && allowed == other.allowed
     }
+
+    override fun iterator(): Iterator<T> {
+        return allowed?.iterator() ?: values.iterator()
+    }
 }

src/main/java/de/bixilon/minosoft/data/registries/blocks/properties/list/BlockPropertyList.kt

@@ -18,8 +18,10 @@ import de.bixilon.minosoft.data.registries.blocks.properties.BlockProperty
 interface BlockPropertyList {
     operator fun get(name: String): BlockProperty<*>?
 
+    fun unpack(): List<Map<BlockProperty<*>, Any>>
 
     companion object {
+
         fun of(vararg properties: BlockProperty<*>): BlockPropertyList {
             if (properties.isEmpty()) return EmptyPropertyList
 

src/main/java/de/bixilon/minosoft/data/registries/blocks/properties/list/EmptyPropertyList.kt

@@ -13,6 +13,10 @@
 
 package de.bixilon.minosoft.data.registries.blocks.properties.list
 
+import de.bixilon.minosoft.data.registries.blocks.properties.BlockProperty
+
 object EmptyPropertyList : BlockPropertyList {
     override fun get(name: String) = null
+
+    override fun unpack(): List<Map<BlockProperty<*>, Any>> = emptyList()
 }

src/main/java/de/bixilon/minosoft/data/registries/blocks/properties/list/MapPropertyList.kt

@@ -14,6 +14,7 @@
 package de.bixilon.minosoft.data.registries.blocks.properties.list
 
 import de.bixilon.minosoft.data.registries.blocks.properties.BlockProperty
+import java.util.*
 
 class MapPropertyList : BlockPropertyList {
     private var properties: MutableMap<String, BlockProperty<*>> = HashMap(0, 0.1f)
@@ -33,4 +34,30 @@ class MapPropertyList : BlockPropertyList {
         if (properties.isEmpty()) return EmptyPropertyList
         return this
     }
+
+    private fun unpack(iterator: Stack<BlockProperty<*>>, map: Map<BlockProperty<*>, Any>, entries: MutableList<Map<BlockProperty<*>, Any>>) {
+        if (iterator.size == 0) {
+            entries += map
+            return
+        }
+        val property = iterator.pop()
+        for (value in property) {
+            val map = map.toMutableMap()
+            map[property] = value!!
+
+            unpack(iterator, map, entries)
+        }
+        iterator.push(property)
+    }
+
+    override fun unpack(): List<Map<BlockProperty<*>, Any>> {
+        val entries: MutableList<Map<BlockProperty<*>, Any>> = mutableListOf()
+        val stack = Stack<BlockProperty<*>>()
+        for (property in this.properties.values) {
+            stack.push(property)
+        }
+        unpack(stack, emptyMap(), entries)
+
+        return entries
+    }
 }

src/main/java/de/bixilon/minosoft/data/registries/blocks/properties/primitives/BooleanProperty.kt

@@ -17,6 +17,7 @@ import de.bixilon.kutil.primitive.BooleanUtil.toBoolean
 import de.bixilon.minosoft.data.registries.blocks.properties.BlockProperty
 
 class BooleanProperty(name: String) : BlockProperty<Boolean>(name) {
+    val values get() = VALUES
 
     override fun parse(value: Any): Boolean {
         return value.toBoolean()
@@ -26,4 +27,12 @@ class BooleanProperty(name: String) : BlockProperty<Boolean>(name) {
         if (other !is BooleanProperty) return false
         return other.name == name
     }
+
+    override fun iterator(): Iterator<Boolean> {
+        return values.iterator()
+    }
+
+    companion object {
+        val VALUES = booleanArrayOf(false, true)
+    }
 }

src/main/java/de/bixilon/minosoft/data/registries/blocks/properties/primitives/IntProperty.kt

@@ -13,6 +13,7 @@
 
 package de.bixilon.minosoft.data.registries.blocks.properties.primitives
 
+import de.bixilon.kutil.collections.iterator.EmptyIterator.emptyIterator
 import de.bixilon.kutil.primitive.IntUtil.toInt
 import de.bixilon.minosoft.data.registries.blocks.properties.BlockProperty
 
@@ -34,4 +35,8 @@ class IntProperty(
         if (other.name != name) return false
         return other.range == range
     }
+
+    override fun iterator(): Iterator<Int> {
+        return range?.iterator() ?: emptyIterator()
+    }
 }