Fix issue #1511 . Use hashmap to optimize the performance in building CraftingPatternChainList (#1512)

* Use hashmap to optimize the performance in building CraftingPatternChainList

* Another implementation of the hashcode

* some adjustment on code style

* add NBT data in the hash of CraftingPattern

* replace tab with spaces

* fix code style as required

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/CraftingPattern.java

@@ -28,6 +28,7 @@ public class CraftingPattern implements ICraftingPattern {
     private List<List<ItemStack>> oreInputs = new ArrayList<>();
     private List<ItemStack> outputs = new ArrayList<>();
     private List<ItemStack> byproducts = new ArrayList<>();
+    private Integer hashCodeCached = null;
     
     public CraftingPattern(World world, ICraftingPatternContainer container, ItemStack stack) {
         this.container = container;
@@ -274,6 +275,27 @@ public class CraftingPattern implements ICraftingPattern {
             '}';
     }
     
+    @Override
+    public boolean equals (Object obj) {
+        return this == obj || (obj instanceof ICraftingPattern && this.alike((ICraftingPattern) obj));
+    }
+    
+    @Override
+    public int hashCode() {
+        if (hashCodeCached == null) {
+            hashCodeCached = 0;
+            for (ItemStack outputItemStack : this.getOutputs()) {
+                int itemHashCode = 0;
+                itemHashCode = outputItemStack.getCount();
+                itemHashCode = itemHashCode * 31 + outputItemStack.getItem().hashCode();
+                itemHashCode = itemHashCode * 31 + outputItemStack.getItemDamage();
+                itemHashCode = itemHashCode * 31 + Objects.hashCode(outputItemStack.getTagCompound());
+                hashCodeCached = hashCodeCached * 31 + itemHashCode;
+            }
+        }
+        return hashCodeCached;
+    }
+    
     @Override
     public boolean alike(ICraftingPattern other) {
         if (other == this) {

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/CraftingPatternChainList.java

@@ -4,21 +4,29 @@ import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingPattern;
 import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingPatternChain;
 
 import java.util.Collection;
+import java.util.HashMap;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Map;
 import java.util.stream.Collectors;
 
 public class CraftingPatternChainList implements Iterable<CraftingPatternChainList.CraftingPatternChain> {
     LinkedList<CraftingPatternChain> innerChain = new LinkedList<>();
+    Map<ICraftingPattern, CraftingPatternChain> innerChainMap = new HashMap<>();
     
     public void add(ICraftingPattern pattern) {
-        int i = 0;
-        while (i < innerChain.size() && !innerChain.get(i).add(pattern)) {
-            i++;
-        }
-        if (i == innerChain.size()) {
-            innerChain.add(new CraftingPatternChain(pattern));
+        CraftingPatternChain chain = innerChainMap.get(pattern);
+        if (chain == null) {
+            chain = new CraftingPatternChain(pattern);
+            innerChain.add(chain);
+            innerChainMap.put(pattern, chain);
+        } else {
+            if (!chain.add(pattern)) {
+                chain = new CraftingPatternChain(pattern);
+                innerChain.add(chain);
+                innerChainMap.put(pattern, chain);
+            }	
         }
     }
 
@@ -37,6 +45,7 @@ public class CraftingPatternChainList implements Iterable<CraftingPatternChainLi
 
     public void clear() {
         innerChain.clear();
+        innerChainMap.clear();
     }
 
     public static class CraftingPatternChain implements ICraftingPatternChain {