Beginnings of a Java API. This is under heavy construction.

Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>

src/api/java/com/Microsoft/Z3/DecRefQUeue.java

@@ -0,0 +1,50 @@
+/**
+ * This file was automatically generated from DecRefQUeue.cs 
+ **/
+
+package com.Microsoft.Z3;
+
+/* using System; */
+/* using System.Collections; */
+/* using System.Collections.Generic; */
+/* using System.Threading; */
+
+    abstract class DecRefQueue
+
+        private void ObjectInvariant()
+            
+        
+
+        readonly protected Object mLock = new Object();
+        readonly protected List<IntPtr> mQueue = new List<IntPtr>();
+        const Integer mMoveLimit = 1024;
+
+        public abstract void IncRef(Context ctx, IntPtr obj);
+        public abstract void DecRef(Context ctx, IntPtr obj);
+
+        public void IncAndClear(Context ctx, IntPtr o)
+            
+
+            IncRef(ctx, o);
+            if (mQueue.Count >= mMoveLimit) Clear(ctx);
+
+        public void Add(IntPtr o)
+            if (o == IntPtr.Zero) return;
+
+            lock (mLock)
+                mQueue.Add(o);
+
+        public void Clear(Context ctx)
+            
+
+            lock (mLock)
+                for (IntPtr.Iterator o = mQueue.iterator(); o.hasNext(); )
+                    DecRef(ctx, o);
+                mQueue.Clear();
+
+    abstract class DecRefQueueContracts : DecRefQueue
+        public void IncRef(Context ctx, IntPtr obj)
+            
+
+        public void DecRef(Context ctx, IntPtr obj)
+