Started work on Demon Will Inversion system.

src/main/java/WayofTime/bloodmagic/api/soul/DemonWillHolder.java

@@ -0,0 +1,99 @@
+package WayofTime.bloodmagic.api.soul;
+
+import java.util.HashMap;
+import java.util.Map.Entry;
+
+import net.minecraft.nbt.NBTTagCompound;
+
+public class DemonWillHolder
+{
+    public HashMap<EnumDemonWillType, Double> willMap = new HashMap<EnumDemonWillType, Double>();
+
+    public double addWill(EnumDemonWillType type, double amount, double max)
+    {
+        double current = 0;
+        if (willMap.containsKey(type))
+        {
+            current = willMap.get(type);
+        }
+
+        double added = Math.min(max - current, amount);
+        addWill(type, amount);
+
+        return added;
+    }
+
+    public void addWill(EnumDemonWillType type, double amount)
+    {
+        if (willMap.containsKey(type))
+        {
+            willMap.put(type, amount + willMap.get(type));
+        } else
+        {
+            willMap.put(type, amount);
+        }
+    }
+
+    public double drainWill(EnumDemonWillType type, double amount)
+    {
+        if (willMap.containsKey(type))
+        {
+            double current = willMap.get(type);
+            double reduced = Math.min(current, amount);
+
+            if (reduced >= current)
+            {
+                willMap.remove(type);
+            } else
+            {
+                willMap.put(type, current - reduced);
+            }
+
+            return reduced;
+        }
+
+        return 0;
+    }
+
+    public double getWill(EnumDemonWillType type)
+    {
+        if (willMap.containsKey(type))
+        {
+            return willMap.get(type);
+        }
+
+        return 0;
+    }
+
+    public void readFromNBT(NBTTagCompound tag, String key)
+    {
+        NBTTagCompound willTag = tag.getCompoundTag(key);
+
+        willMap.clear();
+
+        for (EnumDemonWillType type : EnumDemonWillType.values())
+        {
+            double amount = willTag.getDouble("EnumWill" + type.getName());
+            if (amount > 0)
+            {
+                willMap.put(type, amount);
+            }
+        }
+    }
+
+    public void writeToNBT(NBTTagCompound tag, String key)
+    {
+        NBTTagCompound willTag = new NBTTagCompound();
+        for (Entry<EnumDemonWillType, Double> entry : willMap.entrySet())
+        {
+            willTag.setDouble("EnumWill" + entry.getKey().getName(), entry.getValue());
+        }
+
+        tag.setTag(key, willTag);
+    }
+
+    public void clearWill()
+    {
+        willMap.clear();
+    }
+}