66 lines
1.8 KiB
Java
66 lines
1.8 KiB
Java
/**
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* Copyright (c) 2011-2017, James Zhan 詹波 (jfinal@126.com).
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.jfinal.template.expr.ast;
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import com.jfinal.template.TemplateException;
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import com.jfinal.template.stat.Location;
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import com.jfinal.template.stat.ParseException;
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import com.jfinal.template.stat.Scope;
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import java.lang.reflect.Field;
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/**
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* StaticField : ID_list '::' ID
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* 动态获取静态变量值，变量值改变时仍可正确获取
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* 用法：com.jfinal.core.Const::JFINAL_VERSION
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*/
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public class StaticField extends Expr {
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private Class<?> clazz;
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private String fieldName;
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private Field field;
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public StaticField(String className, String fieldName, Location location) {
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try {
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this.clazz = Class.forName(className);
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this.fieldName = fieldName;
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this.field = clazz.getField(fieldName);
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this.location = location;
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} catch (Exception e) {
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throw new ParseException(e.getMessage(), location, e);
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}
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}
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public Object eval(Scope scope) {
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try {
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return field.get(null);
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} catch (Exception e) {
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throw new TemplateException(e.getMessage(), location, e);
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}
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}
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public String toString() {
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return clazz.getName() + "::" + fieldName;
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}
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}
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