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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   
   28   import javax.script.Bindings;
   29   import java.util.Map;
   30   import java.util.AbstractMap;
   31   
   32   /**
   33    * Abstract super class for Bindings implementations
   34    *
   35    * @author Mike Grogan
   36    * @since 1.6
   37    */
   38   public abstract class BindingsBase extends AbstractMap<String, Object>
   39           implements Bindings {
   40   
   41       //AbstractMap methods
   42       public Object get(Object name) {
   43           checkKey(name);
   44           return getImpl((String)name);
   45       }
   46   
   47       public Object remove(Object key) {
   48           checkKey(key);
   49           return removeImpl((String)key);
   50       }
   51   
   52       public Object put(String key, Object value) {
   53           checkKey(key);
   54           return putImpl(key, value);
   55       }
   56   
   57       public void putAll(Map<? extends String, ? extends Object> toMerge) {
   58           for (Map.Entry<? extends String, ? extends Object> entry : toMerge.entrySet()) {
   59               String key = entry.getKey();
   60               checkKey(key);
   61               putImpl(entry.getKey(), entry.getValue());
   62           }
   63       }
   64   
   65       //BindingsBase methods
   66       public abstract Object putImpl(String name, Object value);
   67       public abstract Object getImpl(String name);
   68       public abstract Object removeImpl(String name);
   69       public abstract String[] getNames();
   70   
   71       protected void checkKey(Object key) {
   72           if (key == null) {
   73               throw new NullPointerException("key can not be null");
   74           }
   75           if (!(key instanceof String)) {
   76               throw new ClassCastException("key should be String");
   77           }
   78           if (key.equals("")) {
   79               throw new IllegalArgumentException("key can not be empty");
   80           }
   81       }
   82   }

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