initial add of EbeanORM server based on v2.8.1

src/main/java/com/avaje/ebeaninternal/server/util/ArrayStack.java

@@ -0,0 +1,107 @@
+/**
+ * Copyright (C) 2009 Authors
+ * 
+ * This file is part of Ebean.
+ * 
+ * Ebean is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *  
+ * Ebean is distributed in the hope that it will be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Ebean; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA  
+ */
+package com.avaje.ebeaninternal.server.util;
+
+import java.util.ArrayList;
+import java.util.EmptyStackException;
+
+/**
+ * Stack based on ArrayList.
+ *
+ * @author rbygrave
+ */
+public class ArrayStack<E> {
+
+    private final ArrayList<E> list;
+
+    /**
+     * Creates an empty Stack with an initial size.
+     */
+    public ArrayStack(int size) {
+        this.list = new ArrayList<E>(size);
+    }
+
+    /**
+     * Creates an empty Stack.
+     */
+    public ArrayStack() {
+        this.list = new ArrayList<E>();
+    }
+
+    /**
+     * Pushes an item onto the top of this stack. 
+     */
+    public E push(E item) {
+        list.add(item);
+        return item;
+    }
+
+    /**
+     * Removes the object at the top of this stack and returns that object as
+     * the value of this function.
+     */
+    public E pop() {
+        int len = list.size();
+        E obj = peek();
+        list.remove(len - 1);
+        return obj;
+    }
+
+    protected E peekZero(boolean retNull) {
+        int len = list.size();
+        if (len == 0) {
+            if (retNull) {
+                return null;
+            }
+            throw new EmptyStackException();
+        }
+        return list.get(len - 1);
+    }
+
+    /**
+     * Returns the object at the top of this stack without removing it.
+     */
+    public E peek() {
+        return peekZero(false);
+    }
+    
+    /**
+     * Returns the object at the top of this stack without removing it.
+     * If the stack is empty this returns null.
+     */
+    public E peekWithNull() {
+        return peekZero(true);
+    }
+    
+    /**
+     * Tests if this stack is empty.
+     */
+    public boolean isEmpty() {
+        return list.isEmpty();
+    }
+
+    public int size(){
+        return list.size();
+    }
+    
+    public boolean contains(Object o){
+    	return list.contains(o);
+    }
+}