| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 javax.servlet.jsp.el; |
| |
| /** |
| * <p>This class is used to customize the way an ExpressionEvaluator resolves |
| * variable references at evaluation time. For example, instances of this class can |
| * implement their own variable lookup mechanisms, or introduce the |
| * notion of "implicit variables" which override any other variables. |
| * An instance of this class should be passed when evaluating |
| * an expression.</p> |
| * |
| * <p>An instance of this class includes the context against which resolution |
| * will happen</p> |
| * |
| * @since 2.0 |
| */ |
| public interface VariableResolver |
| { |
| //------------------------------------- |
| /** |
| * Resolves the specified variable. |
| * Returns null if the variable is not found. |
| * |
| * @param pName the name of the variable to resolve |
| * @return the result of the variable resolution |
| * |
| * @throws ELException if a failure occurred while trying to resolve |
| * the given variable |
| **/ |
| public Object resolveVariable (String pName) |
| throws ELException; |
| |
| //------------------------------------- |
| } |
