working on bencode lists, test covering

src/main/java/com/mykola2312/retracker/bencode/BList.java

@@ -0,0 +1,62 @@
+package com.mykola2312.retracker.bencode;
+
+import java.util.Iterator;
+
+public class BList extends BValue {
+	private BValue last = null;
+	private int length = 0;
+	
+	@Override()
+	public BType getType() {
+		return BType.LIST;
+	}
+	
+	protected BValue getFirst() {
+		return getChild();
+	}
+	
+	protected void setFirst(BValue first) {
+		setChild(first);
+	}
+	
+	protected BValue getLast() {
+		return last;
+	}
+	
+	protected void setLast(BValue last) {
+		this.last = last;
+	}
+	
+	// builder
+	public BList append(BValue item) {
+		BValue first = getFirst();
+		if (first == null) {
+			setFirst(item);
+			setLast(item);
+		} else {
+			BValue last = getLast();
+			last.setNext(item);
+			setLast(item);
+		}
+		
+		length++;
+		return this;
+	}
+	
+	public int getLength() {
+		return length;
+	}
+	
+	public BValue get(int index) throws IndexOutOfBoundsException {
+		Iterator<BValue> it = iterator();
+		if (index < 0 || index >= length) {
+			throw new IndexOutOfBoundsException();
+		}
+		
+		while (--index > 0) {
+			it.next();
+		}
+		
+		return it.next();
+	}
+}

src/test/java/com/mykola2312/retracker/bencode/BListTest.java

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+package com.mykola2312.retracker.bencode;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import org.junit.jupiter.api.Test;
+
+public class BListTest {
+	@Test
+	public void testEmptyList() {
+		BList empty = new BList();
+		
+		assertEquals(0, empty.getLength());
+		assertNull(empty.getChild());
+	}
+}