From f274f75f32349642fff582c641aec731de939eff Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Mon, 21 May 2007 00:12:37 +0000
Subject: Added ViewCursor class.

---
 .../com/amazon/carbonado/cursor/TestCursors.java   | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/src/test/java/com/amazon/carbonado/cursor/TestCursors.java b/src/test/java/com/amazon/carbonado/cursor/TestCursors.java
index fa5d8a7..b93fe11 100644
--- a/src/test/java/com/amazon/carbonado/cursor/TestCursors.java
+++ b/src/test/java/com/amazon/carbonado/cursor/TestCursors.java
@@ -92,6 +92,83 @@ public class TestCursors extends TestCase {
         assertFalse(cursor.hasNext());
     }
 
+    public void testView() throws Exception {
+        Cursor<Element> view;
+
+        // Empty source.
+        view = new ViewCursor<Element>(createElements(), 10, 100);
+        compareElements(view);
+        view = new ViewCursor<Element>(createElements(), 10, 10);
+        compareElements(view);
+
+        // start at zero
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 0, 100);
+        compareElements(view, 1, 2, 3, 4, 5);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 0, 5);
+        compareElements(view, 1, 2, 3, 4, 5);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 0, 4);
+        compareElements(view, 1, 2, 3, 4);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 0, 1);
+        compareElements(view, 1);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 0, 0);
+        compareElements(view);
+
+        // start after zero
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 1, 100);
+        compareElements(view, 2, 3, 4, 5);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 1, 5);
+        compareElements(view, 2, 3, 4, 5);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 1, 4);
+        compareElements(view, 2, 3, 4);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 1, 2);
+        compareElements(view, 2);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 1, 1);
+        compareElements(view);
+
+        // start too high
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 5, 100);
+        compareElements(view);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 50, 100);
+        compareElements(view);
+
+        // start in middle but end high
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 2, 100);
+        compareElements(view, 3, 4, 5);
+
+        // start after zero and skip
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 2, 100);
+        assertEquals(1, view.skipNext(1));
+        compareElements(view, 4, 5);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 2, 4);
+        assertEquals(1, view.skipNext(1));
+        compareElements(view, 4);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 2, 100);
+        assertEquals(2, view.skipNext(2));
+        compareElements(view, 5);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 2, 100);
+        assertEquals(3, view.skipNext(3));
+        compareElements(view);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 2, 100);
+        assertEquals(3, view.skipNext(4));
+        compareElements(view);
+
+        // start in middle, end high, and skip
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 2, 100);
+        assertEquals(2, view.skipNext(2));
+        compareElements(view, 5);
+
+        // start too high and skip
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 5, 100);
+        assertEquals(0, view.skipNext(1));
+        compareElements(view);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 5, 5);
+        assertEquals(0, view.skipNext(1));
+        compareElements(view);
+        view = new ViewCursor<Element>(createElements(1, 2, 3, 4, 5), 500, 600);
+        assertEquals(0, view.skipNext(1));
+        compareElements(view);
+    }
+
     public void testUnion() throws Exception {
         Cursor<Element> left, right, union;
 
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