1 files changed, 38 insertions, 0 deletions
diff --git a/src/main/kotlin/io/dico/parcels2/blockvisitor/ExtraBlockChange.kt b/src/main/kotlin/io/dico/parcels2/blockvisitor/ExtraBlockChange.kt
new file mode 100644
index 0000000..3f7e070
--- /dev/null
+++ b/src/main/kotlin/io/dico/parcels2/blockvisitor/ExtraBlockChange.kt
@@ -0,0 +1,38 @@
+package io.dico.parcels2.blockvisitor
+
+import org.bukkit.block.Block
+import org.bukkit.block.BlockState
+import org.bukkit.block.Sign
+import kotlin.reflect.KClass
+
+interface ExtraBlockChange {
+    fun update(block: Block)
+}
+
+abstract class BlockStateChange<T : BlockState> : ExtraBlockChange {
+    abstract val stateClass: KClass<T>
+
+    abstract fun update(state: T)
+
+    override fun update(block: Block) {
+        val state = block.state
+        if (stateClass.isInstance(state)) {
+            @Suppress("UNCHECKED_CAST")
+            update(state as T)
+        }
+    }
+}
+
+class SignStateChange(state: Sign) : BlockStateChange<Sign>() {
+    val lines = state.lines
+
+    override val stateClass: KClass<Sign>
+        get() = Sign::class
+
+    override fun update(state: Sign) {
+        for (i in lines.indices) {
+            val line = lines[i]
+            state.setLine(i, line)
+        }
+    }
+}