tools/erlanalysis/src/main/java/org/apache/dubbo/erlang/analysis/generater/ErlProjectGenerater.java

package org.apache.dubbo.erlang.analysis.generater;

import org.apache.dubbo.erlang.analysis.parse.CommonTypeInfo;
import org.apache.dubbo.erlang.analysis.parse.InterfaceInfo;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader;

import java.io.*;
import java.util.List;

/**
 * Created by dlive on 22/02/2018.
 */
public class ErlProjectGenerater {
    private VelocityEngine ve = new VelocityEngine();

    private ProjectInfo projectInfo;
    private String projectSaveDir;
    private String projectSrcDir;
    private String projectIncludeDir;
    public ErlProjectGenerater(ProjectInfo projectInfo){
        this.projectInfo=projectInfo;

        ve.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
        ve.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName());
        ve.init();
        makeProjectDir();

    }
    public void genProject(List<InterfaceInfo> list_interfaces){
        for (InterfaceInfo interfaceItem : list_interfaces) {
            genInterface(interfaceItem);
        }
        genProjectCommonFile();
        genProjectIncludeInfo();
        genProjectTypeList();
    }

    private boolean genInterface(InterfaceInfo interfaceItem){
        // 获取模板文件
        Template t = ve.getTemplate("templates/interface.vm");
        // 设置变量
        VelocityContext ctx = new VelocityContext();
        ctx.put("appName",projectInfo.getAppName());
        ctx.put("moduleName", interfaceItem.getModuleName());
        ctx.put("className",interfaceItem.getInterfaceName());
        ctx.put("methodList",interfaceItem.getMethods());

        // 输出
        StringWriter sw = new StringWriter();
        t.merge(ctx,sw);
        FileWriter sourceFile = null;
        try {
            sourceFile = new FileWriter(this.projectSrcDir+ File.separator+interfaceItem.getModuleName()+".erl");
            sourceFile.write(sw.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                sourceFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return true;
    }

    private boolean makeProjectDir(){
        String savedir = System.getProperty("user.dir") + File.separator + "genProjectDir";
        projectSaveDir=String.format("%s%s%s",savedir,File.separator,projectInfo.getAppName());

        File rootDir = new File(projectSaveDir);
        if(!rootDir.exists()){
            if(!rootDir.mkdirs()){
                return false;
            }
        }
        projectSrcDir=String.format("%s%ssrc",projectSaveDir,File.separator);
        File projectSrcFile= new File(projectSrcDir);
        if(!projectSrcFile.exists()){
            if(!projectSrcFile.mkdirs()){
                return false;
            }
        }

        projectIncludeDir=String.format("%s%sinclude",projectSaveDir,File.separator);
        File projectIncludeFile= new File(projectIncludeDir);
        if(!projectIncludeFile.exists()){
            if(!projectIncludeFile.mkdirs()){
                return false;
            }
        }
        return true;
    }

    /**
     * 生成项目公共文件
     * @return
     */
    private boolean genProjectCommonFile(){
        // 获取模板文件

        VelocityContext ctx = new VelocityContext();
        ctx.put("appName",projectInfo.getAppName());
        ctx.put("appVersion",projectInfo.getAppVersion());


        FileWriter appFile = null;
        FileWriter appSrcFile = null;
        FileWriter appSupFile = null;
        try {
            // 输出
            Template appTpl = ve.getTemplate("templates/app.vm");
            StringWriter appFileWriter = new StringWriter();
            appTpl.merge(ctx,appFileWriter);

            appFile = new FileWriter(this.projectSrcDir+ File.separator+projectInfo.getAppName()+"_app.erl");
            appFile.write(appFileWriter.toString());

            // 输出
            Template appSrcTpl = ve.getTemplate("templates/app_src.vm");
            StringWriter appSrcFileWriter = new StringWriter();
            appSrcTpl.merge(ctx,appSrcFileWriter);
            appSrcFile = new FileWriter(this.projectSrcDir+ File.separator+projectInfo.getAppName()+".app.src");
            appSrcFile.write(appSrcFileWriter.toString());

            Template appSupTpl = ve.getTemplate("templates/app_sup.vm");
            StringWriter appSupFileWriter = new StringWriter();
            appSupTpl.merge(ctx,appSupFileWriter);
            appSupFile = new FileWriter(this.projectSrcDir+ File.separator+projectInfo.getAppName()+"_sup.erl");
            appSupFile.write(appSupFileWriter.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                appFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                appSrcFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                appSupFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return true;
    }

    private void genProjectIncludeInfo(){
        // 获取模板文件
        Template t = ve.getTemplate("templates/app_type_include.vm");
        // 设置变量
        VelocityContext ctx = new VelocityContext();
        ctx.put("typeList", CommonTypeInfo.getInstances().getCommonTypeList());
        // 输出
        StringWriter sw = new StringWriter();
        t.merge(ctx,sw);
        writeFile(this.projectIncludeDir+File.separator+projectInfo.getAppName()+".hrl",sw.toString());
    }

    private void genProjectTypeList(){
        // 获取模板文件
        Template t = ve.getTemplate("templates/app_type_list.vm");
        // 设置变量
        VelocityContext ctx = new VelocityContext();
        ctx.put("appName",projectInfo.getAppName());
        ctx.put("typeList", CommonTypeInfo.getInstances().getCommonTypeList());
        // 输出
        StringWriter sw = new StringWriter();
        t.merge(ctx,sw);
        writeFile(this.projectSrcDir+File.separator+projectInfo.getAppName()+"_type_list.erl",sw.toString());
    }


    private boolean writeFile(String filePath,String content){
        FileWriter sourceFile = null;
        try {
            sourceFile = new FileWriter(filePath);
            sourceFile.write(content);
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }finally {
            try {
                sourceFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return true;
    }

}