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| |
| <h1>ADB Tweaking Guide</h1> |
| |
| <p>This document explains the mechanisms available to extend ADB |
| and possibly adopt it to compile schemas to support other |
| languages.</p> |
| |
| <div class="section"> |
| <h2><a name="Content"></a>Content</h2> |
| |
| <ul> |
| |
| <li><a href="#intro">Introduction</a></li> |
| |
| <li><a href="#config">Know the Configuration</a></li> |
| |
| <li><a href="#first_tweak">The First Tweak - Generate Plain Java |
| Beans</a></li> |
| |
| <li><a href="#advanced_tweak">A More Advanced Tweak - Generate Code |
| for Another Language</a></li> |
| </ul> |
| <a name="intro" id="intro"></a> |
| |
| <div class="section"> |
| <h2><a name="Introduction"></a>Introduction</h2> |
| |
| <p>ADB was written with future extensibility in mind, with a clear |
| and flexible way to extend or modify its functionality. Available |
| mechanisms to extend ADB and possibly adopt it to compile schemas |
| to support other languages are described below.</p> |
| <a name="config" id="config"></a> |
| |
| <div class="section"> |
| <h2><a name="Know_the_Configuration"></a>Know the Configuration</h2> |
| |
| <p>The configuration for the ADB framework is in the |
| <b>schema-compile.properties</b> file found in the |
| <b>org.apache.axis2.schema</b> package. This properties |
| file has the following important properties</p> |
| |
| <ul> |
| |
| <li>schema.bean.writer.class |
| |
| <p>This is the writer class. This is used by the schema compiler to |
| write the beans and should implement the |
| <b>org.apache.axis2.schema.writer.BeanWriter</b> |
| interface. The schema compiler delegates the bean writing task to |
| the specified instance of the BeanWriter.</p> |
| </li> |
| |
| <li>schema.bean.writer.template |
| |
| <p>This specifies the template to be used in the BeanWriter. The |
| BeanWriter author is free to use any mechanism to write the classes |
| but the default mechanism is to use a xsl template. This property |
| may be left blank if the BeanWriter implementation does not use a |
| template.</p> |
| </li> |
| |
| <li>schema.bean.typemap |
| |
| <p>This is the type map to be used by the schema compiler. It |
| should be an implementation of the |
| <b>org.apache.axis2.schema.typemap.TypeMap</b> interface. |
| The default typemap implementation encapsulates a hashmap with type |
| QName to Class name string mapping.</p> |
| </li> |
| </ul> |
| <a name="first_tweak" id="first_tweak"></a> |
| |
| <div class="section"> |
| <h2><a name="The_First_Tweak_-_Generate_Plain_Java_Beans"></a>The First Tweak - Generate Plain Java Beans</h2> |
| |
| <p>The first, most simple tweak for the code generator could be to |
| switch to plain bean generation. The default behavior of the ADB |
| framework is to generate ADBBeans, but most users, if they want to |
| use ADB as a standalone compiler, would prefer to have plain java |
| beans. This can in fact be done by simply changing the template |
| used.</p> |
| |
| <p>The template for plain java beans is already available in the |
| <b>org.apache.axis2.schema.template</b> package. To make |
| this work replace the |
| <b>/org/apache/axis2/databinding/schema/template/ADBBeanTemplate.xsl</b> |
| with the |
| <b>/org/apache/axis2/databinding/schema/template/PlainBeanTemplate.xsl</b> |
| in the schema-compile.properties<b>.</b></p> |
| |
| <p>Congratulations! You just tweaked ADB to generate plain java |
| beans.</p> |
| |
| <p>To generate custom formats, the templates need to be modified. |
| The schema for the xml generated by the JavaBeanWriter is available |
| in the source tree under the Other directory in the codegen module. |
| Advanced users with knowledge of XSLT can easily modify the |
| templates to generate code in their own formats.</p> |
| <a name="advanced_tweak" id="advanced_tweak"></a> |
| |
| <div class="section"> |
| <h2><a name="A_More_Advanced_Tweak_-_Generate_Code_for_Another_Language"></a>A More Advanced Tweak - Generate Code for Another Language</h2> |
| |
| <p>To generate code for another language, there are two main |
| components that need to be written.</p> |
| |
| <ul> |
| |
| <li>The BeanWriter |
| |
| <p>Implement the BeanWriter interface for this class. A nice |
| example is the |
| <b>org.apache.axis2.schema.writer.JavaBeanWriter</b> |
| which has a lot of reusable code. In fact if the target language is |
| object-oriented (such as C# or even C++), one would even be able to |
| extend the JavaBeanWriter itself.</p> |
| </li> |
| |
| <li>The TypeMap |
| |
| <p>Implement the TypeMap interface for this class. The |
| <b>org.apache.axis2.schema.typemap.JavaTypeMap</b> class |
| is a simple implementation for the typemap where the QName to class |
| name strings are kept inside a hashmap instance. This technique is |
| fairly sufficient and only the type names would need to change to |
| support another language.</p> |
| </li> |
| </ul> |
| |
| <p>Surprisingly, this is all that needs to be done to have other |
| language support for ADB. Change the configuration and you are |
| ready to generate code for other languages!</p> |
| |
| <p>This tweaking guide is supposed to be a simple guideline for |
| anyone who wishes to dig deep into the mechanics of the ADB code |
| generator. Users are free to experiment with it and modify the |
| schema compiler accordingly to their needs. Also note that the |
| intention of this section is <i>not</i> to be a step by step |
| guide to custom code generation. Anyone who wish to do so would |
| need to dig into the code and get their hands dirty!</p> |
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