| /* |
| * $Id$ |
| * |
| * 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 org.apache.tiles.el; |
| |
| import javax.el.ELResolver; |
| import javax.el.ExpressionFactory; |
| import javax.el.ValueExpression; |
| |
| import org.apache.tiles.evaluator.AbstractAttributeEvaluator; |
| import org.apache.tiles.request.ApplicationContext; |
| import org.apache.tiles.request.Request; |
| |
| /** |
| * Evaluates string expression with typical EL syntax.<br> |
| * You can use normal EL syntax, knowing that the root objects are |
| * {@link Request}, {@link ApplicationContext} and beans |
| * contained in request, session and application scope. |
| * |
| * @version $Rev$ $Date$ |
| * @since 2.2.1 |
| */ |
| public class ELAttributeEvaluator extends AbstractAttributeEvaluator { |
| |
| /** |
| * Initialization parameter to decide the implementation of |
| * {@link ExpressionFactoryFactory}. |
| * |
| * @since 2.2.1 |
| */ |
| public static final String EXPRESSION_FACTORY_FACTORY_INIT_PARAM = |
| "org.apache.tiles.evaluator.el.ExpressionFactoryFactory"; |
| |
| /** |
| * The EL expression factory. |
| * |
| * @since 2.2.1 |
| */ |
| protected ExpressionFactory expressionFactory; |
| |
| /** |
| * The EL resolver to use. |
| * |
| * @since 2.2.1 |
| */ |
| protected ELResolver resolver; |
| |
| /** |
| * Constructor. |
| * |
| * @since 2.2.1 |
| */ |
| public ELAttributeEvaluator() { |
| } |
| |
| /** |
| * Sets the expression factory to use. |
| * |
| * @param expressionFactory The expression factory. |
| * @since 2.2.1 |
| */ |
| public void setExpressionFactory(ExpressionFactory expressionFactory) { |
| this.expressionFactory = expressionFactory; |
| } |
| |
| /** |
| * Sets the EL resolver to use. |
| * |
| * @param resolver The EL resolver. |
| * @since 2.2.1 |
| */ |
| public void setResolver(ELResolver resolver) { |
| this.resolver = resolver; |
| } |
| |
| /** {@inheritDoc} */ |
| public Object evaluate(String expression, Request request) { |
| ELContextImpl context = new ELContextImpl(resolver); |
| context.putContext(Request.class, request); |
| context.putContext(ApplicationContext.class, |
| request.getApplicationContext()); |
| ValueExpression valueExpression = expressionFactory |
| .createValueExpression(context, expression, Object.class); |
| |
| return valueExpression.getValue(context); |
| } |
| } |