Merge pull request #625 from GTNewHorizons/speedup

GT_Recipe Speedup

1 files changed, 30 insertions, 0 deletions

diff --git a/src/main/java/gregtech/api/objects/iterators/MergedIterator.java b/src/main/java/gregtech/api/objects/iterators/MergedIterator.java
new file mode 100644
index 0000000000..77fac8d22f
--- /dev/null
+++ b/src/main/java/gregtech/api/objects/iterators/MergedIterator.java
@@ -0,0 +1,30 @@
+package gregtech.api.objects.iterators;
+
+import java.util.Iterator;
+
+public class MergedIterator<T> implements Iterator<T> {
+    private final Iterator<T>[] inners;
+    private int current;
+
+    @SafeVarargs
+    public MergedIterator(Iterator<T>... iterators) {
+        inners = iterators;
+        current = 0;
+    }
+
+    public boolean hasNext() {
+        while (current < inners.length && !inners[current].hasNext()) {
+            current++;
+        }
+
+        return current < inners.length;
+    }
+
+    public T next() {
+        while (current < inners.length && !inners[current].hasNext()) {
+            current++;
+        }
+
+        return inners[current].next();
+    }
+}