--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/dancres/blitz/entry/SleeveState.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,60 @@
+package org.dancres.blitz.entry;
+
+/**
+   Each Sleeve held in-cache has a chunk of management state associated with it
+   which is maintained in an instance of this class
+ */
+class SleeveState {
+    /**
+       If set, indicates this Sleeve does not exist on disk.
+       i.e.  If it needs to be written to disk it should be inserted rather
+       than updated (create as opposed to update).
+     */
+    static final int NOT_ON_DISK = 1;
+
+    /**
+       Indicates this Sleeve has been deleted and the space can be reclaimed.
+     */
+    static final int DELETED = 2;
+
+    /**
+       If set, indicates that this Sleeve should not be saved to disk
+
+       @see org.dancres.blitz.entry.WriteScheduler
+     */
+    static final int PINNED = 4;
+
+    private int theFlags;
+
+    /**
+       Applies the specified state cummulatively to the current state flags.
+       i.e. Logical OR
+     */
+    synchronized void set(int aFlags) {
+        theFlags |= aFlags;
+    }
+
+    /**
+       Replace existing state with that passed in.
+     */
+    synchronized void setExplicit(int aFlags) {
+        theFlags = aFlags;
+    }
+
+    synchronized boolean test(int aFlag) {
+        return ((theFlags & aFlag) != 0);
+    }
+
+    synchronized void clear(int aFlag) {
+        int myMask = aFlag ^ 0xFFFFFFFF;
+        theFlags &= myMask;
+    }
+
+    synchronized int get() {
+        return theFlags;
+    }
+
+    public synchronized String toString() {
+        return  Integer.toBinaryString(theFlags);
+    }
+}