From 67c42358e2940a166649b95a871ae7e47fb3ef17 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Fri, 27 Sep 2013 21:47:01 +0200
Subject: wip

---
 src/main/java/io/trygvis/btree/HeapPage.java | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

(limited to 'src/main/java/io/trygvis/btree/HeapPage.java')

diff --git a/src/main/java/io/trygvis/btree/HeapPage.java b/src/main/java/io/trygvis/btree/HeapPage.java
index a931260..32ba0ef 100644
--- a/src/main/java/io/trygvis/btree/HeapPage.java
+++ b/src/main/java/io/trygvis/btree/HeapPage.java
@@ -53,11 +53,27 @@ public class HeapPage {
         bytes.putInt(FREE_POSITION_INDEX, freePosition);
     }
 
+    public void prepend(byte[] item) {
+        int bytesFree = bytesFree();
+        int bytesRequested = item.length;
+
+        if (bytesRequested > bytesFree) {
+            throw new PageOverflowException(bytesFree, bytesRequested);
+        }
+
+        byte[] array = bytes.array();
+        int offset = bytes.arrayOffset();
+
+        System.arraycopy(array, offset, array, offset + bytesRequested, bytesRequested);
+
+        freePosition -= itemSize;
+    }
+
     public int bytesFree() {
         return freePosition - headerSize;
     }
 
-    public Iterable<ByteBuffer> bufferIterator() {
+    public Iterable<ByteBuffer> items() {
         return new Iterable<ByteBuffer>() {
             @Override
             public Iterator<ByteBuffer> iterator() {
-- 
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