Update MappedIterator.java

src/main/java/org/warp/commonutils/functional/MappedIterator.java

@@ -0,0 +1,43 @@
+package org.warp.commonutils.functional;
+
+import java.util.Iterator;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import org.jetbrains.annotations.Nullable;
+
+public class MappedIterator<A, B> implements Iterator<B> {
+
+	private final Iterator<A> iterator;
+	private final Function<A,B> mappingFunction;
+
+	private MappedIterator(Iterator<A> iterator, Function<A, B> mappingFunction) {
+		this.iterator = iterator;
+		this.mappingFunction = mappingFunction;
+	}
+
+	public static <T, U> Iterator<U> of(Iterator<T> originalIterator, Function<@Nullable T, @Nullable U> mappingFunction) {
+		return new MappedIterator<>(originalIterator, mappingFunction);
+	}
+
+	@Override
+	public boolean hasNext() {
+		return iterator.hasNext();
+	}
+
+	@Override
+	public B next() {
+		return mappingFunction.apply(iterator.next());
+	}
+
+	@Override
+	public void remove() {
+		iterator.remove();
+	}
+
+	@Override
+	public void forEachRemaining(Consumer<? super B> action) {
+		iterator.forEachRemaining((item) -> {
+			action.accept(mappingFunction.apply(item));
+		});
+	}
+}