XSLT驱动的代码自动生成教程与框架探讨

需积分: 9 159 浏览量更新于2024-08-02 收藏 116KB PDF 举报

本篇文档《Code generation using XSLT》由IBM developerWorks提供，旨在向读者介绍代码生成的概念，特别聚焦于使用XSLT作为代码生成工具的应用。教程分为多个部分，包括： 1. **教程概述**：自动化代码生成是一种强大的工程实践，它通过减少人工工作量和提高效率来优化软件开发过程。本教程首先定义了代码生成的基础概念，并解释了它在软件开发中的作用。 2. **安装工具**：教程指导如何安装必要的工具，如用于支持代码生成的开源工具，如Apache Ant和Jalopy，这些工具对实现灵活的框架至关重要。 3. **代码生成基础**：章节深入讨论了代码生成的核心原理，强调了XSLT在代码生成中的角色，它是一种XML样式表语言，能将XML文档转换成其他格式，如Java、C#等代码。 4. **生成JavaBeans**：这部分展示了如何利用XSLT来生成JavaBean对象，这是一种设计模式，常用于简化组件间的交互。教程提供了实际操作步骤和示例，帮助读者理解如何利用XSLT模板生成可配置的Java类。 5. **代码生成框架**：作者提到了一个基于开放源代码的框架，它允许用户更灵活地定制代码生成过程，克服了XSLT生成代码时可能遇到的一些局限性。这个框架结合了Ant和Jalopy等工具，使得代码生成更加适应不同项目需求。 6. **使用XSLT进行代码生成**：这部分详细讲解了如何利用XSLT的转换功能，将XML模板转换成特定编程语言的代码。教程提供了实例，展示了如何设计和执行XSLT脚本来实现代码自动生成。 7. **总结与资源**：最后，作者对整个教程进行了总结，回顾了关键点，并推荐了更多的学习资源，帮助读者进一步深化对代码生成和XSLT的理解。通过阅读这篇教程，开发者可以掌握XSLT在代码生成中的应用，了解其优点和局限性，以及如何利用开源工具构建定制化的代码生成解决方案。无论是对于初学者还是经验丰富的开发者来说，这都是一份实用且具有启发性的指南。

Section 3. Introduction to code generation

A code generation primer

This section introduces the basic principles of code generation and reviews the two

most common ways in which code generation is typically applied. Also covered are the

benefits and limitations of using XML and XSLT as code generation tools.

Code generation is not a new idea; tools for automatically generating code have been

around for many years. Yet, due to the increasing sophistication and complexity of

modern application frameworks (such as J2EE or .NET), it is a technique that is once

more gaining popularity. While not a substitute for a detailed understanding of the

fundamentals of any framework, it is a tool that can (among the other benefits

discussed in Little languages and the benefits of code generation on page 6 ) certainly

help increase productivity by automating many repetitive tasks.

An example of the redundant complexity common to application frameworks can be

taken from the J2EE platform: Creating a single Enterprise JavaBean (EJB) requires

the creation of two separate interfaces -- an implementation of those interfaces and two

deployment descriptors that configure that bean for a particular application server.

There is a great deal of information shared between the various Java source files and

configuration files, so using a code generator is a natural approach to managing that

redundancy.

This approach is the most common way that code generation is used: The code

generator creates the basic boilerplate code for a project or application component that

a software engineer then adds to. Obviously, this is generally a one-off process, as the

original code cannot be regenerated without losing the manual modifications.

The second approach to using code generation is more iterative. The generated code

is typically limited to a specific functional area in an application, such as a database

persistence layer. A developer can then treat this component as a black box, allowing

the generated code to be incorporated into an application without change. This

approach works best within a well-factored application framework with well-defined

interfaces between its various components.

You can even use a code generator to create a complete application, assembling it

from existing application components. In this form the technique is very similar to

scripting an application, but without the need to actually embed a separate scripting

language in the application. The code generator executes the script to create the code

that glues the application together.

Little languages and the benefits of code generation

The iterative black box approach to code generation has the potential to deliver the

greatest benefits. Commonly, a declarative description of the desired functionality is

ibm.com/developerWorks

Presented by developerWorks, your source for great tutorials

Page 6 of 31 Code generation using XSLT

created using a little language that serves as the input to the code generator. A little

language is a high-level declarative language targeted at a particular application or

business domain. Like code generators, little languages are not new ideas and are

used for more purposes than just driving the generation of code. Commonly

encountered examples of little languages include Makefiles, Ant build files, Apache

Web server config files, etc. But while both Makefiles and Ant build files are examples

of little languages, they have very different syntaxes. However, they do share an

application domain: the description of build processes.

A code generator processes scripts written in a little language to generate the actual

program code. The little language is therefore used to create a functional description of

the application or component's behavior. This achieves a good separation between the

underlying implementation (the output of the code generator) and the functional

description of the application (the input to the code generator). This separation has the

following benefits:

• You can tune the code generator separately from any given functional description,

thereby improving the quality of the generated code for all applications that use the

code generation tool.

• You can transparently alter the target programming language, allowing code to be

generated in a variety of target languages.

• A declarative description of a process, embodied as a little language, is more

understandable as it is no longer obscured by implementation details.

• A non-engineer (for example, a business analyst) can create and manage the

functional description, freeing the engineer to concentrate on the details of the

framework itself.

XML and XSLT for little languages

XML is a natural choice for creating little languages to serve as input for code

generators. Without using XML, you would have to write a complete grammar and

parser for the custom language, and this is a fairly specialized task that not all

programmers are comfortable with. The wide range of off-the-shelf parsers and tools

available for working with XML make it a natural alternative to environments like Lex

and Yacc.

With XML as the underlying syntax for a little language, XSLT is a natural choice for a

processing tool to convert that language into source code. In particular, its ability to

generate plain-text output makes it suitable for generating a wide variety of different

source code formats, including simple shell scripts, SQL statements, and even Java or

C++ code. Other useful features of XSLT include:

• Stylesheets, which are highly portable between processors and platforms.

• Built-in modularity (using xsl:import and xsl:include), which allows for the

creation of reusable libraries of transformations.

• XSLT and XPath, which incorporate an extension mechanism that allows new

elements and functions to be added to the language. You can make these

extensions, while typically processor-specific, portable. See Resources on page 29 for

Presented by developerWorks, your source for great tutorials

ibm.com/developerWorks

Code generation using XSLT Page 7 of 31

剩余30页未读，继续阅读

CFQ0313

粉丝: 0
资源: 2

XSLT驱动的代码自动生成教程与框架探讨

USIM_Explorer改iccid软件.zip

PE_Explorer.rar

USIM application R7.zip

go语言怎么使用xslt.NewProcessor()

Duplicate template id: 'org.eclipse.wst.xslt.templates.xpath.number'

windows系统 golang调用c文件时报错，fatal error: libxslt/xslt.h: No such file or directory

c# xamltosvgxslt

在C#中用XslCompiledTransform 将xml转成文本

fatal error: libxslt/xslt.h: No such file or directory

C#中，将xml转换为文本的代码示例。

最新资源