package com.easyjf.web.tools;

import java.io.BufferedReader;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;

import org.apache.log4j.Logger;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.context.Context;
import org.apache.velocity.io.VelocityWriter;

public class TemplateGenerator {
	private static final Logger logger = (Logger) Logger
			.getLogger(TemplateGenerator.class.getName());

	private String templateDir;// 模板主目錄

	private String targetDir;// 生成文件存放位置主目錄

	private String templateName;// 模塊文件名

	private String targetName;// 生成目標文件名

	private ITemplateProcess process;// 處理器，負責執(zhí)行相應的商業(yè)邏輯，并把數據添加到context當中

	private Context context = null;

	private Template template = null;

	public void generator() {
		context = new VelocityContext();
		File file = new File(targetDir + targetName);
		if (!file.exists())
			file.getParentFile().mkdirs();		
		template = VelocityFactory.getTemplate(templateDir, templateName,
				"UTF-8");
		try {
			if (process != null)
				process.process(context);
			mergeTemplate(template, context, file);
			System.out.println("成功生成了文件:" + file.getAbsolutePath());
		} catch (Exception e) {
			System.out.println("生成出錯，請確認數據庫配置及表名是否正確！" + e);
			e.printStackTrace();
		}
	}

	private void mergeTemplate(Template template, Context context, File file) {
		Writer writer = null;
		VelocityWriter vw = null;
		try {
			writer = new OutputStreamWriter(new FileOutputStream(file),
					template.getEncoding() != null ? template.getEncoding()
							: "UTF-8");
			vw = new VelocityWriter(writer, 4 * 1024, true);
			template.merge(context, vw);
		} catch (Exception e) {
			logger.error("合成錯誤：" + e);
			e.printStackTrace();
		} finally {
			if (vw != null) {
				try {
					vw.flush();
				} catch (Exception e) {
					logger.error(e.getMessage());
					e.printStackTrace();
				}
			}
		}
	}

	public String getTargetDir() {
		return targetDir;
	}

	public void setTargetDir(String targetDir) {
		this.targetDir = targetDir;
	}

	public String getTargetName() {
		return targetName;
	}

	public void setTargetName(String targetName) {
		this.targetName = targetName;
	}

	public String getTemplateDir() {
		return templateDir;
	}

	public void setTemplateDir(String templateDir) {
		this.templateDir = templateDir;
	}

	public String getTemplateName() {
		return templateName;
	}

	public void setTemplateName(String templateName) {
		this.templateName = templateName;
	}

	public ITemplateProcess getProcess() {
		return process;
	}

	public void setProcess(ITemplateProcess process) {
		this.process = process;
	}

	public static void test() {
		TemplateGenerator tg = new TemplateGenerator();
		tg.setTemplateDir("c:\\tools");
		tg.setTemplateName("/java/crudAction.java");
		tg.setTargetDir("c:\\tools\\target\\");
		tg.setTargetName("/testAction.java");
		tg.setProcess(new CrudActionTemplateProcess("UserTable"));
		tg.generator();
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
	
	}
}