1 files changed, 65 insertions, 0 deletions
diff --git a/src/main/kotlin/io/dico/parcels2/defaultimpl/DefaultParcelContainer.kt b/src/main/kotlin/io/dico/parcels2/defaultimpl/DefaultParcelContainer.kt
new file mode 100644
index 0000000..0597a9f
--- /dev/null
+++ b/src/main/kotlin/io/dico/parcels2/defaultimpl/DefaultParcelContainer.kt
@@ -0,0 +1,65 @@
+package io.dico.parcels2.defaultimpl
+
+import io.dico.parcels2.Parcel
+import io.dico.parcels2.ParcelContainer
+import io.dico.parcels2.ParcelWorld
+import kotlin.coroutines.experimental.buildIterator
+import kotlin.coroutines.experimental.buildSequence
+
+class DefaultParcelContainer(val world: ParcelWorld) : ParcelContainer {
+    private var parcels: Array<Array<Parcel>>
+
+    init {
+        parcels = initArray(world.options.axisLimit, world)
+    }
+
+    fun resizeIfSizeChanged() {
+        if (parcels.size != world.options.axisLimit * 2 + 1) {
+            resize(world.options.axisLimit)
+        }
+    }
+
+    fun resize(axisLimit: Int) {
+        parcels = initArray(axisLimit, world, this)
+    }
+
+    fun initArray(axisLimit: Int, world: ParcelWorld, cur: DefaultParcelContainer? = null): Array<Array<Parcel>> {
+        val arraySize = 2 * axisLimit + 1
+        return Array(arraySize) {
+            val x = it - axisLimit
+            Array(arraySize) {
+                val z = it - axisLimit
+                cur?.getParcelById(x, z) ?: ParcelImpl(world, x, z)
+            }
+        }
+    }
+
+    override fun getParcelById(x: Int, z: Int): Parcel? {
+        return parcels.getOrNull(x + world.options.axisLimit)?.getOrNull(z + world.options.axisLimit)
+    }
+
+    override fun nextEmptyParcel(): Parcel? {
+        return walkInCircle().find { it.owner == null }
+    }
+
+    private fun walkInCircle(): Iterable<Parcel> = Iterable {
+        buildIterator {
+            val center = world.options.axisLimit
+            for (radius in 0..center) {
+                var x = center - radius;
+                var z = center - radius
+                repeat(radius * 2) { yield(parcels[x++][z]) }
+                repeat(radius * 2) { yield(parcels[x][z++]) }
+                repeat(radius * 2) { yield(parcels[x--][z]) }
+                repeat(radius * 2) { yield(parcels[x][z--]) }
+            }
+        }
+    }
+
+    fun allParcels(): Sequence<Parcel> = buildSequence {
+        for (array in parcels) {
+            yieldAll(array.iterator())
+        }
+    }
+
+}
+\ No newline at end of file