119 lines
3.8 KiB
Java
119 lines
3.8 KiB
Java
/**
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* Copyright (c) 2011-2019, 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.ext.directive;
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import java.io.IOException;
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import java.util.Date;
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import com.jfinal.template.Directive;
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import com.jfinal.template.Env;
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import com.jfinal.template.TemplateException;
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import com.jfinal.template.expr.ast.Expr;
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import com.jfinal.template.expr.ast.ExprList;
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import com.jfinal.template.io.Writer;
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import com.jfinal.template.stat.ParseException;
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import com.jfinal.template.stat.Scope;
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/**
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* #date 日期格式化输出指令
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*
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* 三种用法：
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* 1：#date(createAt) 用默认 datePattern 配置，输出 createAt 变量中的日期值
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* 2：#date(createAt, "yyyy-MM-dd HH:mm:ss") 用第二个参数指定的 datePattern，输出 createAt 变量中的日期值
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* 3：#date() 用默认 datePattern 配置，输出 “当前” 日期值
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*
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* 注意：
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* 1：#date 指令中的参数可以是变量，例如：#date(d, p) 中的 d 与 p 可以全都是变量
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* 2：默认 datePattern 可通过 Engine.setDatePattern(...) 进行配置
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*/
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public class DateDirective extends Directive {
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private Expr valueExpr;
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private Expr datePatternExpr;
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private int paraNum;
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public void setExprList(ExprList exprList) {
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this.paraNum = exprList.length();
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if (paraNum > 2) {
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throw new ParseException("Wrong number parameter of #date directive, two parameters allowed at most", location);
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}
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if (paraNum == 0) {
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this.valueExpr = null;
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this.datePatternExpr = null;
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} else if (paraNum == 1) {
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this.valueExpr = exprList.getExpr(0);
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this.datePatternExpr = null;
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} else if (paraNum == 2) {
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this.valueExpr = exprList.getExpr(0);
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this.datePatternExpr = exprList.getExpr(1);
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}
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}
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public void exec(Env env, Scope scope, Writer writer) {
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if (paraNum == 1) {
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outputWithoutDatePattern(env, scope, writer);
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} else if (paraNum == 2) {
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outputWithDatePattern(env, scope, writer);
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} else {
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outputToday(env, writer);
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}
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}
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private void outputToday(Env env, Writer writer) {
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write(writer, new Date(), env.getEngineConfig().getDatePattern());
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}
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private void outputWithoutDatePattern(Env env, Scope scope, Writer writer) {
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Object value = valueExpr.eval(scope);
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if (value instanceof Date) {
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write(writer, (Date)value, env.getEngineConfig().getDatePattern());
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} else if (value != null) {
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throw new TemplateException("The first parameter date of #date directive must be Date type", location);
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}
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}
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private void outputWithDatePattern(Env env, Scope scope, Writer writer) {
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Object value = valueExpr.eval(scope);
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if (value instanceof Date) {
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Object datePattern = this.datePatternExpr.eval(scope);
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if (datePattern instanceof String) {
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write(writer, (Date)value, (String)datePattern);
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} else {
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throw new TemplateException("The sencond parameter datePattern of #date directive must be String", location);
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}
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} else if (value != null) {
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throw new TemplateException("The first parameter date of #date directive must be Date type", location);
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}
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}
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private void write(Writer writer, Date date, String datePattern) {
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try {
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writer.write(date, datePattern);
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} catch (IOException e) {
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throw new TemplateException(e.getMessage(), location, e);
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}
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}
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}
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