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    1   /*
    2    * Copyright (c) 2005, 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.script.util;
   27   import java.util;
   28   import javax.script.Bindings;
   29   
   30   /*
   31    * Abstract super class for Bindings implementations. Handles
   32    * global and local scopes.
   33    *
   34    * @author Mike Grogan
   35    * @since 1.6
   36    */
   37   public abstract class BindingsImpl extends BindingsBase {
   38   
   39       //get method delegates to global if key is not defined in
   40       //base class or local scope
   41       protected Bindings global = null;
   42   
   43       //get delegates to local scope
   44       protected Bindings local = null;
   45   
   46       public void setGlobal(Bindings n) {
   47           global = n;
   48       }
   49   
   50       public void setLocal(Bindings n) {
   51           local = n;
   52       }
   53   
   54       public  Set<Map.Entry<String, Object>> entrySet() {
   55           return new BindingsEntrySet(this);
   56       }
   57   
   58       public Object get(Object key) {
   59           checkKey(key);
   60   
   61           Object ret  = null;
   62           if ((local != null) && (null != (ret = local.get(key)))) {
   63               return ret;
   64           }
   65   
   66           ret = getImpl((String)key);
   67   
   68           if (ret != null) {
   69               return ret;
   70           } else if (global != null) {
   71               return global.get(key);
   72           } else {
   73               return null;
   74           }
   75       }
   76   
   77       public Object remove(Object key) {
   78           checkKey(key);
   79           Object ret = get(key);
   80           if (ret != null) {
   81               removeImpl((String)key);
   82           }
   83           return ret;
   84       }
   85   }

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