1 /*
   2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.xml.internal.bind.v2.runtime.property;
  27 
  28 import com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl;
  29 import com.sun.xml.internal.bind.v2.runtime.unmarshaller.Scope;
  30 
  31 
  32 /**
  33  * Pass around a 'ticket dispenser' when creating new
  34  * unmarshallers. This controls the index of the slot
  35  * allocated to the chain of handlers.
  36 
  37  *
  38  * <p>
  39  * A ticket dispenser also maintains the offset for handlers
  40  * to access state slots. A handler records this value when it's created.
  41  *
  42  *
  43  */
  44 public final class UnmarshallerChain {
  45     /**
  46      * This offset allows child unmarshallers to have its own {@link Scope} without colliding with siblings.
  47      */
  48     private int offset = 0;
  49 
  50     public final JAXBContextImpl context;
  51 
  52     public UnmarshallerChain(JAXBContextImpl context) {
  53         this.context = context;
  54     }
  55 
  56     /**
  57      * Allocates a new {@link Scope} offset.
  58      */
  59     public int allocateOffset() {
  60         return offset++;
  61     }
  62 
  63     /**
  64      * Gets the number of total scope offset allocated.
  65      */
  66     public int getScopeSize() {
  67         return offset;
  68     }
  69 }