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