Make the checking of instances of other mods' interfaces safer.

Fixes (part of) #2316

src/main/java/mekanism/common/FuelHandler.java

@@ -4,6 +4,7 @@ import java.util.HashMap;
 
 import mekanism.api.MekanismConfig.general;
 import mekanism.api.gas.Gas;
+import mekanism.common.util.MekanismUtils;
 
 import net.minecraftforge.fluids.FluidContainerRegistry;
 import cpw.mods.fml.common.ModAPIManager;
@@ -27,7 +28,7 @@ public class FuelHandler
 			return fuels.get(gas.getName());
 		}
 
-		if(ModAPIManager.INSTANCE.hasAPI("BuildCraftAPI|fuels") && gas.hasFluid())
+		if(BCPresent() && gas.hasFluid())
 		{
 			IFuel bcFuel = BuildcraftFuelRegistry.fuel.getFuel(gas.getFluid());
 			
@@ -60,4 +61,9 @@ public class FuelHandler
 			energyPerTick = bcFuel.getPowerPerCycle() * general.FROM_TE;
 		}
 	}
+
+	public static boolean BCPresent()
+	{
+		return ModAPIManager.INSTANCE.hasAPI("BuildCraftAPI|fuels") && MekanismUtils.classExists("buildcraft.api.fuels.BuildcraftFuelRegistry") && MekanismUtils.classExists("buildcraft.api.fuels.IFuel");
+	}
 }

src/main/java/mekanism/common/block/BlockEnergyCube.java

@@ -171,7 +171,7 @@ public class BlockEnergyCube extends BlockContainer implements IPeripheralProvid
 					return true;
 				}
 
-				if(ModAPIManager.INSTANCE.hasAPI("BuildCraftAPI|tools") && tool instanceof IToolWrench)
+				if(MekanismUtils.isBCWrench(tool))
 					((IToolWrench)tool).wrenchUsed(entityplayer, x, y, z);
 
 				int change = ForgeDirection.ROTATION_MATRIX[side][tileEntity.facing];

src/main/java/mekanism/common/block/BlockGasTank.java

@@ -110,7 +110,7 @@ public class BlockGasTank extends BlockContainer
 					return true;
 				}
 
-				if(ModAPIManager.INSTANCE.hasAPI("BuildCraftAPI|tools") && tool instanceof IToolWrench)
+				if(MekanismUtils.isBCWrench(tool))
 					((IToolWrench)tool).wrenchUsed(entityplayer, x, y, z);
 
 				int change = ForgeDirection.ROTATION_MATRIX[ForgeDirection.UP.ordinal()][tileEntity.facing];

src/main/java/mekanism/common/block/BlockMachine.java

@@ -617,7 +617,7 @@ public class BlockMachine extends BlockContainer implements ISpecialBounds, IPer
 					return true;
 				}
 
-				if(ModAPIManager.INSTANCE.hasAPI("BuildCraftAPI|tools") && tool instanceof IToolWrench)
+				if(MekanismUtils.isBCWrench(tool))
 				{
 					((IToolWrench)tool).wrenchUsed(entityplayer, x, y, z);
 				}

src/main/java/mekanism/common/util/MekanismUtils.java

@@ -11,6 +11,7 @@ import java.net.HttpURLConnection;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
@@ -94,6 +95,8 @@ public final class MekanismUtils
 {
 	public static final ForgeDirection[] SIDE_DIRS = new ForgeDirection[] {ForgeDirection.NORTH, ForgeDirection.SOUTH, ForgeDirection.WEST, ForgeDirection.EAST};
 
+	public static final Map<String, Class<?>> classesFound = new HashMap<String, Class<?>>();
+
 	/**
 	 * Checks for a new version of Mekanism.
 	 */
@@ -1389,6 +1392,63 @@ public final class MekanismUtils
 		return Item.getIdFromItem(itemStack.getItem());
 	}
 
+	public static boolean classExists(String className)
+	{
+		if(classesFound.containsKey(className))
+		{
+			return classesFound.get(className) != null;
+		}
+
+		Class<?> found;
+
+		try
+		{
+			found = Class.forName(className);
+		}
+		catch(ClassNotFoundException e)
+		{
+			found = null;
+		}
+
+		classesFound.put(className, found);
+
+		return found != null;
+	}
+
+	public static boolean existsAndInstance(Object obj, String className)
+	{
+		Class<?> theClass;
+
+		if(classesFound.containsKey(className))
+		{
+			theClass = classesFound.get(className);
+		}
+		else
+		{
+			try
+			{
+				theClass = Class.forName(className);
+				classesFound.put(className, theClass);
+			} catch(ClassNotFoundException e)
+			{
+				classesFound.put(className, null);
+				return false;
+			}
+		}
+
+		return theClass != null && theClass.isInstance(obj);
+	}
+
+	public static boolean isBCWrench(Item tool)
+	{
+		return existsAndInstance(tool, "buildcraft.api.tools.IToolWrench");
+	}
+
+	public static boolean isCoFHHammer(Item tool)
+	{
+		return existsAndInstance(tool, "cofh.api.item.IToolHammer");
+	}
+
 	/**
 	 * Whether or not the player has a usable wrench for a block at the coordinates given.
 	 * @param player - the player using the wrench
@@ -1406,12 +1466,12 @@ public final class MekanismUtils
 			return true;
 		}
 		
-		if(ModAPIManager.INSTANCE.hasAPI("BuildCraftAPI|tools") && tool.getItem() instanceof IToolWrench && ((IToolWrench)tool.getItem()).canWrench(player, x, y, z))
+		if(isBCWrench(tool.getItem()) && ((IToolWrench)tool.getItem()).canWrench(player, x, y, z))
 		{
 			return true;
 		}
 		
-		if(ModAPIManager.INSTANCE.hasAPI("CoFHAPI") && tool.getItem() instanceof IToolHammer && ((IToolHammer)tool.getItem()).isUsable(tool, player, x, y, z))
+		if(isCoFHHammer(tool.getItem()) && ((IToolHammer)tool.getItem()).isUsable(tool, player, x, y, z))
 		{
 			return true;
 		}

src/main/java/mekanism/generators/common/MekanismGenerators.java

@@ -87,7 +87,7 @@ public class MekanismGenerators implements IModule
 	@EventHandler
 	public void postInit(FMLPostInitializationEvent event)
 	{
-		if(ModAPIManager.INSTANCE.hasAPI("BuildCraftAPI|fuels") && BuildcraftFuelRegistry.fuel != null)
+		if(FuelHandler.BCPresent() && BuildcraftFuelRegistry.fuel != null)
 		{
 			for(IFuel s : BuildcraftFuelRegistry.fuel.getFuels())
 			{

src/main/java/mekanism/generators/common/block/BlockGenerator.java

@@ -327,7 +327,7 @@ public class BlockGenerator extends BlockContainer implements ISpecialBounds, IP
 					return true;
 				}
 
-				if(ModAPIManager.INSTANCE.hasAPI("BuildCraftAPI|tools") && tool instanceof IToolWrench)
+				if(MekanismUtils.isBCWrench(tool))
 					((IToolWrench)tool).wrenchUsed(entityplayer, x, y, z);
 
 				int change = ForgeDirection.ROTATION_MATRIX[ForgeDirection.UP.ordinal()][tileEntity.facing];

src/main/java/mekanism/generators/common/block/BlockReactor.java

@@ -175,7 +175,7 @@ public class BlockReactor extends BlockContainer implements IBlockCTM
 
 		if(entityplayer.getCurrentEquippedItem() != null)
 		{
-			if(ModAPIManager.INSTANCE.hasAPI("BuildCraftAPI|tools") && entityplayer.getCurrentEquippedItem().getItem() instanceof IToolWrench && !entityplayer.getCurrentEquippedItem().getUnlocalizedName().contains("omniwrench"))
+			if(MekanismUtils.isBCWrench(entityplayer.getCurrentEquippedItem().getItem()) && !entityplayer.getCurrentEquippedItem().getUnlocalizedName().contains("omniwrench"))
 			{
 				if(entityplayer.isSneaking())
 				{

src/main/java/mekanism/generators/common/tile/TileEntitySolarGenerator.java

@@ -131,7 +131,7 @@ public class TileEntitySolarGenerator extends TileEntityGenerator
 		{
 			ret = GENERATION_RATE;
 
-			if(ModAPIManager.INSTANCE.hasAPI("Galacticraft API") && worldObj.provider instanceof ISolarLevel)
+			if(MekanismUtils.existsAndInstance(worldObj.provider, "micdoodle8.mods.galacticraft.api.world.ISolarLevel"))
 			{
 				ret *= ((ISolarLevel)worldObj.provider).getSolarEnergyMultiplier();
 			}