From f2581ff123b3a9822963122124f81f09fc5647fa Mon Sep 17 00:00:00 2001
From: johni0702 <me@johni0702.de>
Date: Sat, 10 Oct 2015 17:26:16 +0200
Subject: [PATCH] Add safety checks to GridLayout so we fail-fast

---
 .../java/de/johni0702/minecraft/gui/layout/GridLayout.java     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/de/johni0702/minecraft/gui/layout/GridLayout.java b/src/main/java/de/johni0702/minecraft/gui/layout/GridLayout.java
index 1f077dc1..c6fa6e08 100644
--- a/src/main/java/de/johni0702/minecraft/gui/layout/GridLayout.java
+++ b/src/main/java/de/johni0702/minecraft/gui/layout/GridLayout.java
@@ -22,6 +22,7 @@
 
 package de.johni0702.minecraft.gui.layout;
 
+import com.google.common.base.Preconditions;
 import com.google.common.collect.Maps;
 import de.johni0702.minecraft.gui.container.GuiContainer;
 import de.johni0702.minecraft.gui.element.GuiElement;
@@ -54,6 +55,7 @@ public class GridLayout implements Layout {
 
     @Override
     public Map<GuiElement, Pair<ReadablePoint, ReadableDimension>> layOut(GuiContainer<?> container, ReadableDimension size) {
+        Preconditions.checkState(columns != 0, "Columns may not be 0.");
         int elements = container.getElements().size();
         int rows = (elements - 1 + columns) / columns;
         if (rows < 1) {
@@ -91,6 +93,7 @@ public class GridLayout implements Layout {
 
     @Override
     public ReadableDimension calcMinSize(GuiContainer<?> container) {
+        Preconditions.checkState(columns != 0, "Columns may not be 0.");
         int maxWidth = 0, maxHeight = 0;
         int elements = 0;
         for (Map.Entry<GuiElement, LayoutData> entry : container.getElements().entrySet()) {