Java tutorial
/* Copyright 2013-2015 www.snakerflow.com. * * Licensed 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.snaker.engine.spring; import java.util.Map; import java.util.Map.Entry; import org.snaker.engine.Expression; import org.springframework.expression.EvaluationContext; import org.springframework.expression.ExpressionParser; import org.springframework.expression.spel.standard.SpelExpressionParser; import org.springframework.expression.spel.support.StandardEvaluationContext; /** * Spring el?? * @author yuqs * @since 1.2.2 */ public class SpelExpression implements Expression { ExpressionParser parser = new SpelExpressionParser(); public <T> T eval(Class<T> T, String expr, Map<String, Object> args) { EvaluationContext context = new StandardEvaluationContext(); for (Entry<String, Object> entry : args.entrySet()) { context.setVariable(entry.getKey(), entry.getValue()); } return parser.parseExpression(expr).getValue(context, T); } }