143 lines
3.7 KiB
Java
143 lines
3.7 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;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.Writer;
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import java.util.Map;
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import com.jfinal.template.io.ByteWriter;
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import com.jfinal.template.io.CharWriter;
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import com.jfinal.template.io.FastStringWriter;
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import com.jfinal.template.stat.Scope;
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import com.jfinal.template.stat.ast.Stat;
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/**
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* Template
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*
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* 用法：
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* Template template = Engine.use().getTemplate(...);
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* template.render(data, writer);
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* template.renderToString(data);
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*/
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public class Template {
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private Env env;
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private Stat ast;
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public Template(Env env, Stat ast) {
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if (env == null || ast == null) {
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throw new IllegalArgumentException("env and ast can not be null");
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}
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this.env = env;
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this.ast = ast;
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}
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/**
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* 渲染到 OutputStream 中去
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*/
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public void render(Map<?, ?> data, OutputStream outputStream) {
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ByteWriter byteWriter = env.engineConfig.writerBuffer.getByteWriter(outputStream);
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try {
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ast.exec(env, new Scope(data, env.engineConfig.sharedObjectMap), byteWriter);
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} finally {
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byteWriter.close();
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}
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}
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/**
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* 支持无 data 参数，渲染到 OutputStream 中去 <br>
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* 适用于数据在模板中通过表达式和语句直接计算得出等等应用场景
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*/
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public void render(OutputStream outputStream) {
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render(null, outputStream);
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}
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/**
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* 渲染到 Writer 中去
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*/
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public void render(Map<?, ?> data, Writer writer) {
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CharWriter charWriter = env.engineConfig.writerBuffer.getCharWriter(writer);
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try {
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ast.exec(env, new Scope(data, env.engineConfig.sharedObjectMap), charWriter);
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} finally {
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charWriter.close();
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}
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}
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/**
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* 支持无 data 参数，渲染到 Writer 中去 <br>
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* 适用于数据在模板中通过表达式和语句直接计算得出等等应用场景
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*/
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public void render(Writer writer) {
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render(null, writer);
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}
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/**
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* 渲染到 String 中去
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*/
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public String renderToString(Map<?, ?> data) {
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FastStringWriter fsw = env.engineConfig.writerBuffer.getFastStringWriter();
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try {
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render(data, fsw);
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return fsw.toString();
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} finally {
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fsw.close();
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}
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}
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/**
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* 渲染到 StringBuilder 中去
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*/
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public StringBuilder renderToStringBuilder(Map<?, ?> data) {
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FastStringWriter fsw = new FastStringWriter();
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render(data, fsw);
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return fsw.getBuffer();
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}
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/**
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* 渲染到 File 中去
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* 适用于代码生成器类似应用场景
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*/
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public void render(Map<?, ?> data, File file) {
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try (FileOutputStream fos = new FileOutputStream(file)) {
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render(data, fos);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* 渲染到 String fileName 参数所指定的文件中去
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* 适用于代码生成器类似应用场景
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*/
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public void render(Map<?, ?> data, String fileName) {
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render(data, new File(fileName));
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}
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public boolean isModified() {
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return env.isSourceListModified();
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}
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}
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