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 }