3 files changed, 90 insertions, 0 deletions
diff --git a/src/main/java/gregtech/api/objects/iterators/ArrayIterator.java b/src/main/java/gregtech/api/objects/iterators/ArrayIterator.java
new file mode 100644
index 0000000000..267a132ad5
--- /dev/null
+++ b/src/main/java/gregtech/api/objects/iterators/ArrayIterator.java
@@ -0,0 +1,24 @@
+package gregtech.api.objects.iterators;
+
+import java.util.Iterator;
+
+public class ArrayIterator<T> implements Iterator<T> {
+    private final T[] arr;
+    private int offset;
+
+    public ArrayIterator(T[] arr) {
+        this.arr = arr;
+    }
+
+    @Override
+    public boolean hasNext() {
+        return offset != arr.length;
+    }
+
+    @Override
+    public T next() {
+        T out = arr[offset];
+        offset++;
+        return out;
+    }
+}
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();
+    }
+}
diff --git a/src/main/java/gregtech/api/objects/iterators/NonNullIterator.java b/src/main/java/gregtech/api/objects/iterators/NonNullIterator.java
new file mode 100644
index 0000000000..22dd33ba2b
--- /dev/null
+++ b/src/main/java/gregtech/api/objects/iterators/NonNullIterator.java
@@ -0,0 +1,36 @@
+package gregtech.api.objects.iterators;
+
+import java.util.Iterator;
+
+public class NonNullIterator<T> implements Iterator<T> {
+    private final Iterator<T> internal;
+    private T last = null;
+
+    public NonNullIterator(Iterator<T> in) {
+        this.internal = in;
+    }
+
+    @Override
+    public boolean hasNext() {
+        while (last == null) {
+            if (internal.hasNext()) {
+                last = internal.next();
+            } else {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public T next() {
+        while (last == null) {
+            last = internal.next();
+        }
+
+        T temp = last;
+        last = null;
+        return temp;
+    }
+}