Mybatisgenerator修改Mapper.java文件实现详解

   public void generateFiles(ProgressCallback callback,
            List<GeneratedJavaFile> generatedJavaFiles,
            List<GeneratedXmlFile> generatedXmlFiles, List<String> warnings)
            throws InterruptedException {
        if (introspectedTables != null) {
            for (IntrospectedTable introspectedTable : introspectedTables) {
                callback.checkCancel();
                introspectedTable.initialize();
                introspectedTable.calculateGenerators(warnings, callback);
                //这里是 javaFiles的组装地方，主要去看一下introspectedTable
                        .getGeneratedJavaFiles()方法
                generatedJavaFiles.addAll(introspectedTable
                        .getGeneratedJavaFiles());
                        //
                generatedXmlFiles.addAll(introspectedTable
                        .getGeneratedXmlFiles());
				//这里预留了插件来生成JavaFile文件;
                generatedJavaFiles.addAll(pluginAggregator
                        .contextGenerateAdditionalJavaFiles(introspectedTable));
                //这里预留了插件来生成Xml文件;
                generatedXmlFiles.addAll(pluginAggregator
                        .contextGenerateAdditionalXmlFiles(introspectedTable));
            }
        }
        generatedJavaFiles.addAll(pluginAggregator
                .contextGenerateAdditionalJavaFiles());
        generatedXmlFiles.addAll(pluginAggregator
                .contextGenerateAdditionalXmlFiles());
    }

@Override
    public List<GeneratedJavaFile> getGeneratedJavaFiles() {
        List<GeneratedJavaFile> answer = new ArrayList<GeneratedJavaFile>();
		//javaModelGenerators 存的是 JavaModel 和 JavaModelExample 类
        for (AbstractJavaGenerator javaGenerator : javaModelGenerators) {
        //这一行才是重点，因为所有的准备数据都是在这个方法里面
            List<CompilationUnit> compilationUnits = javaGenerator
                    .getCompilationUnits();
            for (CompilationUnit compilationUnit : compilationUnits) {
                GeneratedJavaFile gjf = new GeneratedJavaFile(compilationUnit,
                        context.getJavaModelGeneratorConfiguration()
                                .getTargetProject(),
                                context.getProperty(PropertyReGIStry.CONTEXT_JAVA_FILE_ENcoding),
                                context.getJavaFORMatter());
                answer.add(gjf);
            }
        }
		//	clientGenerators 然后javaModelGenerators 存的是 JavaMapper.java文件 
        for (AbstractJavaGenerator javaGenerator : clientGenerators) {
         //这一行才是重点，因为所有的准备数据都是在这个方法里面
            List<CompilationUnit> compilationUnits = javaGenerator
                    .getCompilationUnits();
            for (CompilationUnit compilationUnit : compilationUnits) {
                GeneratedJavaFile gjf = new GeneratedJavaFile(compilationUnit,
                        context.getJavaClientGeneratorConfiguration()
                                .getTargetProject(),
                                context.getProperty(PropertyRegistry.CONTEXT_JAVA_FILE_ENCODING),
                                context.getJavaFormatter());
                answer.add(gjf);
            }
        }
        return answer;
    }

 @Override
    public List<CompilationUnit> getCompilationUnits() {
        progressCallback.startTask(getString("Progress.17", //$NON-NLS-1$
                introspectedTable.getFullyQualifiedTable().toString()));
        CommentGenerator commentGenerator = context.getCommentGenerator();
        FullyQualifiedJavaType type = new FullyQualifiedJavaType(
                introspectedTable.getMyBatis3JavaMapperType());
        Interface interfaze = new Interface(type);
        interfaze.setVisibility(JavaVisibility.PUBLIC);
        //看到这里喜出望外，这里就是扩展点了；因为它把inerfaze给传进去了，那我们可以在这里做一些我们想做的事情
        commentGenerator.addJavaFileComment(interfaze);
	    //省略无关......

	@Override
	public void addJavaFileComment(CompilationUnit compilationUnit) {
			//生成的是 JavaModel 和 JavaModelExample 文件
			if(compilationUnit instanceof TopLevelClass){
				//这里可以修改  JavaModel 和 JavaModelExample 文件
				
			}
			//生成的是Mapper.java 文件
			if(compilationUnit instanceof Interface){
				Interface anInterface = (Interface)compilationUnit;
				//下面的可以给JavaFile 添加注释
				//topLevelClass.addFileCommentLine("");
				String shortName = compilationUnit.getType().getShortName();
				if(shortName!=null||shortName.endsWith("Mapper"))return;
				//只给JavaModel添加注解就行了，Example不需要
				anInterface.addAnnotation("@Resource");
				anInterface.addImportedType(new FullyQualifiedJavaType("javax.annotation.Resource"));
			}
	}