public void execute() throws MojoExecutionException, MojoFailureException {

        getLog().info(sourceDir);
        getLog().info(testDir);

        File sourceDirectory = new File(sourceDir);
        makeDirIfNotExist(sourceDirectory);
        File testDirectory = new File(testDir);
        makeDirIfNotExist(testDirectory);

        Iterator<File> fileItr = FileUtils.iterateFiles(sourceDirectory, new JavaFileFilter(), TrueFileFilter.INSTANCE);
        while (fileItr.hasNext()) {
            File javaFile = fileItr.next();
            getLog().info("start process file:" + javaFile.getAbsolutePath());
            //process java file
            if (ClassTools.isNeedTest(javaFile, sourceEncode)) {
                convertJavaFile2Test(javaFile);
            }
        }
    }

    /**
     * if dir not exist,create it
     *
     * @param dir
     */
    private void makeDirIfNotExist(File dir) {
        if (!dir.isDirectory()) {
            getLog().error(dir.getAbsolutePath() + "is not a directory!");
        }
        if (!dir.exists()) {
            boolean success = false;
            while (!success) {
                success = dir.mkdirs();
            }
        }
    }


    /**
     * @param javaFile
     */
    private void convertJavaFile2Test(File javaFile) {

        CompilationUnit sourceCU = JavaParserFactory.getCompilationUnit(javaFile, sourceEncode);

        CompilationUnit testCU = null;
        String testJavaFileName = JavaParserUtils.findTestJavaFileName(sourceCU, javaFile, testDir);
        boolean testExist = FileChecker.isTestJavaClassExist(new File(testJavaFileName));
        if (!testExist) {
            CommandInvoker invoker = new CommandInvoker(new NewTestCommand(new NewTestReceiver(sourceCU, javaFile)));
            testCU = invoker.action();
        } else if (testExist) {
            CompilationUnit existTestCU
                    = JavaParserFactory.getCompilationUnit(new File(testJavaFileName), sourceEncode);
            CommandInvoker invoker = new CommandInvoker(new ExistTestCommand(new ExistTestReceiver(sourceCU, javaFile,
                    existTestCU, new File(testJavaFileName))));
            testCU = invoker.action();
        }

        if (null != testCU) {
            //写入测试代码文件
            TestWriter.writeJavaTest(testJavaFileName, testCU.toString(), sourceEncode);
        }
    }