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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.scxml.env.jsp;
18  
19  import javax.servlet.jsp.el.ELException;
20  import javax.servlet.jsp.el.VariableResolver;
21  
22  import org.apache.commons.scxml.Context;
23  import org.apache.commons.scxml.env.SimpleContext;
24  
25  /***
26   * EL Context for SCXML interpreter.
27   *
28   */
29  public class ELContext extends SimpleContext implements VariableResolver {
30  
31      /*** Serial version UID. */
32      private static final long serialVersionUID = 1L;
33  
34      /***
35       * Constructor.
36       *
37       */
38      public ELContext() {
39          super();
40      }
41  
42      /***
43       * Constructor.
44       *
45       * @param parent A parent Context, can be null
46       */
47      public ELContext(final Context parent) {
48          super(parent);
49      }
50  
51      /***
52       * Resolves the specified variable. Returns null if the variable is
53       * not found.
54       *
55       * @param pName The variable to resolve
56       * @return Object The value of the variable, or null, if it does not
57       *                exist
58       * @throws ELException While resolving the variable
59       * @see javax.servlet.jsp.el.VariableResolver#resolveVariable(String)
60       */
61      public Object resolveVariable(final String pName) throws ELException {
62          return get(pName);
63      }
64  
65  }
66