| /* |
| * Copyright 2004,2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.bsf.util; |
| |
| import java.util.Hashtable; |
| |
| /** |
| * An <code>ScriptSymbolTable</code> object is used by a <code>CodeBuffer</code> |
| * object to implement nested scopes. |
| * |
| * @author Matthew J. Duftler |
| */ |
| class ScriptSymbolTable extends Hashtable |
| { |
| private Hashtable parentTable; |
| |
| ScriptSymbolTable(Hashtable parentTable) |
| { |
| this.parentTable = parentTable; |
| } |
| public synchronized Object get(Object key) |
| { |
| Object ret = super.get(key); |
| |
| if (ret == null && parentTable != null) |
| ret = parentTable.get(key); |
| |
| return ret; |
| } |
| } |