Improve ability to access modifier hooks

In most cases, we want to get the hook or default, but sometimes you may want to know if a hook is set. Expose the hook map for that usecase and include a method to get or null to reduce map lookups

src/main/java/slimeknights/tconstruct/library/modifiers/Modifier.java

@@ -1,6 +1,7 @@
 package slimeknights.tconstruct.library.modifiers;
 
 import com.google.gson.JsonObject;
+import lombok.Getter;
 import net.minecraft.ChatFormatting;
 import net.minecraft.core.Direction;
 import net.minecraft.network.FriendlyByteBuf;
@@ -119,6 +120,7 @@ public void toNetwork(Modifier object, FriendlyByteBuf buffer) {}
   @Nullable
   private Component description;
   /** Map of all modifier hooks registered to this modifier */
+  @Getter
   private final ModifierHookMap hooks;
 
   /** Creates a new modifier using the given hook map */
@@ -1065,7 +1067,7 @@ public <T> T getModule(Class<T> type) {
    * @return  Submodule implementing the hook, or default instance if its not implemented
    */
   public final <T> T getHook(ModifierHook<T> hook) {
-    return hooks.getHook(hook);
+    return hooks.getOrDefault(hook);
   }
 
 

src/main/java/slimeknights/tconstruct/library/modifiers/ModifierHooks.java

@@ -27,6 +27,7 @@ private ModifierHooks() {}
   public static ModifierHook<?> getHook(ResourceLocation name) {
     return HOOKS.get(name);
   }
+
   /**
    * Registers a new hook
    * @param hook  Hook to register

src/main/java/slimeknights/tconstruct/library/modifiers/util/ModifierHookMap.java

@@ -5,6 +5,7 @@
 import lombok.RequiredArgsConstructor;
 import slimeknights.tconstruct.library.modifiers.ModifierHook;
 
+import javax.annotation.Nullable;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Map;
@@ -24,10 +25,16 @@ public boolean hasHook(ModifierHook<?> hook) {
     return modules.containsKey(hook);
   }
 
-  /** Gets the module matching the given hook */
+  /** Gets the module matching the given hook, or null if not defined */
   @SuppressWarnings("unchecked")
-  public <T> T getHook(ModifierHook<T> hook) {
-    T object = (T)modules.get(hook);
+  @Nullable
+  public <T> T getOrNull(ModifierHook<T> hook) {
+    return (T)modules.get(hook);
+  }
+
+  /** Gets the module matching the given hook */
+  public <T> T getOrDefault(ModifierHook<T> hook) {
+    T object = getOrNull(hook);
     if (object != null) {
       return object;
     }