GXL to GraphML and Vice Versa with XSLT

We explore the issues involved in converting graph data stored in GXL or GraphML into each other. It turns out that XSLT provides a simple, portable, and effective mechanism for format conversion in either direction. As a by-product, some subtle differences between the formats become apparent.     

基于JGraph可视化工作流模型设计器的开发

工作流模型设计器用户界面和GXL数据转换中,其可视化建模工具采用JAVA设计,扩展JGraph包,生成工作图例.工具自动记录用户对图例的操作,得出各节点属性,实现可视化建模.GXL数据文件转换先将节点属性保存并解析,同时重新生成业务图形,完成可视化工具和GXL数据文件的相互解析.最后通过JDBC和数据库通讯,将从GXL解析出来的节点关系和属性保存至数据表.     

Compiler Hacking for Source Code Analysis

Many activities related to software quality assessment and improvement, such as empirical model construction, data flow analysis, testing or reengineering, rely on static source code analysis as the first and fundamental step for gathering the necessary input information. In the past, two different strategies have been adopted to develop tool suites. There are tools encompassing or implementing the source parse step, where the parser is internal to the toolkit, and is developed and maintained with it. A different approach builds tools on the top of external already-available components such as compilers that output the program abstract syntax tree, or that make it available via an API.This paper discusses techniques, issues and challenges linked to compiler patching or wrapping for analysis purposes. In particular, different approaches for accessing the compiler parsing information are compared, and the techniques used to decouple the parsing front end from the analysis modules are discussed.Moreover, the paper presents an approach and a tool, XOgastan, developed exploiting the gcc/g++ ability to save a representation of the intermediate abstract syntax tree. XOgastan translates the gcc/g++ dumped abstract syntax tree format into a Graph eXchange Language representation, which makes it possible to take advantage of currently available XML tools for any subsequent analysis step. The tool is illustrated and its design discussed, showing its architecture and the main implementation choices made.