From 35eb2149307a55d6ae145d748bae83131dcba0e3 Mon Sep 17 00:00:00 2001
From: Sam Moore <matches@ucc.asn.au>
Date: Fri, 16 Mar 2012 12:16:51 +0800
Subject: [PATCH] Fixed bug in Java AI

In KillUnit:
I was using Vector.remove(Object), but I realised that this doesn't compare
references, instead it uses "compareTo". Which meant the AI deleted every unit
as soon as the first one died. Fun.

I discovered gcj, which lets you compile a Java program.
This is much easier than trying to convince the java interpreter to run.
---
 agents/basic_java/Makefile   |  6 +++++-
 agents/basic_java/basic.java | 19 +++++++++++++++----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/agents/basic_java/Makefile b/agents/basic_java/Makefile
index b058cdf..5088d15 100644
--- a/agents/basic_java/Makefile
+++ b/agents/basic_java/Makefile
@@ -2,12 +2,16 @@
 # Sample C++ Stratego AI
 # UCC Programming Competition 2012 
 
+BasicAI : basic.java Reader.java piece.java
+	gcj -o BasicAI --main=BasicAI basic.java Reader.java piece.java
+
 BasicAI.class : basic.java Reader.java piece.java
 	javac Reader.java
 	javac piece.java
 	javac basic.java
 
 clean : 
-	rm *.class
+	rm -f BasicAI
+	rm -f *.class
 
 
diff --git a/agents/basic_java/basic.java b/agents/basic_java/basic.java
index 242e6cb..e9db507 100644
--- a/agents/basic_java/basic.java
+++ b/agents/basic_java/basic.java
@@ -256,18 +256,29 @@ class BasicAI
 	 */
 	private void KillUnit(Piece kill) throws Exception
 	{
+		Vector<Piece> removeFrom = null;
 		if (kill.colour.compareTo(colour) == 0)
 		{
 			totalAllies[Piece.Index(kill.rank)] -= 1;
-			if (units.remove(kill) == false)
-				throw new Exception("BasicAI.KillUnit - Couldn't remove allied Piece from units Vector!");
+			removeFrom = units;
 		}
 		else if (kill.colour.compareTo(OppositeColour(colour)) == 0)
 		{
 			totalEnemies[Piece.Index(kill.rank)] -= 1;
-			if (enemyUnits.remove(kill) == false)
-				throw new Exception("BasicAI.KillUnit - Couldn't remove enemy Piece from enemyUnits Vector!");
+			removeFrom = enemyUnits;
 		}
+		if (removeFrom == null)
+			throw new Exception("BasicAI.KillUnit - Can't identify unit with colour " + kill.colour + "!");
+
+		for (int ii=0; ii < removeFrom.size(); ++ii)
+		{
+			if (removeFrom.elementAt(ii) == kill)
+			{
+				removeFrom.eraseAt(ii);
+				return;
+			}				
+		}
+		throw new Exception("BasicAI.KillUnit - Couldn't find unit in unit list.");
 	}
 
 	/**
-- 
2.20.1