001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.scxml.env.jsp; 018 019 import javax.servlet.jsp.el.ELException; 020 import javax.servlet.jsp.el.VariableResolver; 021 022 import org.apache.commons.scxml.Context; 023 import org.apache.commons.scxml.env.SimpleContext; 024 025 /** 026 * EL Context for SCXML interpreter. 027 * 028 */ 029 public class ELContext extends SimpleContext implements VariableResolver { 030 031 /** Serial version UID. */ 032 private static final long serialVersionUID = 1L; 033 034 /** 035 * Constructor. 036 * 037 */ 038 public ELContext() { 039 super(); 040 } 041 042 /** 043 * Constructor. 044 * 045 * @param parent A parent Context, can be null 046 */ 047 public ELContext(final Context parent) { 048 super(parent); 049 } 050 051 /** 052 * Resolves the specified variable. Returns null if the variable is 053 * not found. 054 * 055 * @param pName The variable to resolve 056 * @return Object The value of the variable, or null, if it does not 057 * exist 058 * @throws ELException While resolving the variable 059 * @see javax.servlet.jsp.el.VariableResolver#resolveVariable(String) 060 */ 061 public Object resolveVariable(final String pName) throws ELException { 062 return get(pName); 063 } 064 065 } 066