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DEVELOPING FOR THE WEB
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parameter enable.cactus whose value is bound to that of the Ant property of the same name:
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<target name="make-webxml" depends="init"> <webdoclet sourcepath="${src.dir}" destdir="${build.dir}" mergedir="templates" force="true"> <configParam name="enable.cactus" value="${enable.cactus}"/> <classpath> <path refid="xdoclet.classpath"/> <pathelement location="${antbook-common.jar}"/> </classpath> <fileset dir="${src.dir}"> <include name="**/*.java" /> </fileset> <deploymentdescriptor servletspec="2.3" validatexml="true"/> </webdoclet> </target>
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We can now add conditional content into the template files that this task uses, specifically templates/servlets.xml and templates/servlet-mappings.xml. When the <webdoclet> task merges the different template files it interprets its own XML tags in these files as it does so. Most of the tags are only of interest to anyone trying to write a new source processing task on par with <webdoclet>. But there are two configuration tags that are of interest, ifConfigParamEquals and ifConfigParamNotEquals, which can be used to conditionally include and exclude content based on any conditional parameters we define inside a declaration of <webdoclet>. For our problem, we modify the servlets.xml file to make some of the servlet declarations dependent upon this parameter being equal to true:
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<XDtConfig:ifConfigParamEquals paramName="enable.cactus" value="true"> <servlet> <servlet-name>ServletRedirector</servlet-name> <servlet-class> org.apache.cactus.server.ServletTestRedirector </servlet-class> </servlet> <servlet> <servlet-name>JspRedirector</servlet-name> <jsp-file>/test/jspRedirector.jsp</jsp-file> </servlet> </XDtConfig:ifConfigParamEquals>
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If the Ant property is undefined, the configuration parameter will be set to the string ${enable.cactus}, which, as it does not match the string true, is evaluated to be false by XDoclet; the content contained within the conditional element will not be included. Note that we are literally comparing against the string true next, so be careful not to use on or yes simply because other Ant tasks accept these true values (here is room for a new XDoclet template tag to evaluate the string as Ant does!). A CUSTOMIZING WEB APPLICATIONS 295
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similar modification to the template file servlet-mappings.xml applies the change to the second half of the servlet deployment files:
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<XDtConfig:ifConfigParamEquals paramName="enable.cactus" value="true"> <servlet-mapping> <servlet-name>ServletRedirector</servlet-name> <url-pattern>/ServletRedirector/</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>JspRedirector</servlet-name> <url-pattern>/JspRedirector/</url-pattern> </servlet-mapping> </XDtConfig:ifConfigParamEquals>
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When Ant executes the <webdoclet> task with the enable.cactus property set to true, this will set the task s configuration parameter to the same value, and the task will include the two servlet declarations. To use this technique across multiple servers, we recommend you apply techniques that will be recognized by experienced users of C/C++ conditional inclusion with #ifdef. One option is to make the inclusion conditional on a particular machine, based on the value of a target server machine name:
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<XDtConfig:ifConfigParamEquals paramName="server.name" value="ranier"> <servlet-mapping> <servlet-name>ServletRedirector</servlet-name> <url-pattern>/ServletRedirector/</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>JspRedirector</servlet-name> <url-pattern>/JspRedirector/</url-pattern> </servlet-mapping> </XDtConfig:ifConfigParamEquals>
This is a valid approach for configuration options that are definitely per-system, such as the URL of a database server, but for many options, such as these Cactus servlets, it is the wrong approach. It gets overly complicated when more than one server needs to have the same servlets included: you need to copy the same XML fragments into separate conditional statements. Instead, you should tease out each attribute into its own property (cactus.enabled, log4j.enabled, jndi.enabled), then have a configuration for each system that enables or disables these properties as appropriate. A property file for each server would be the ideal place to keep this configuration data; Ant could load the appropriate file for a server before creating the deployment descriptor.
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DEVELOPING FOR THE WEB
Customizing libraries in the WAR file Altering the web.xml deployment descriptor lets you target different systems as destinations for your web application, but it is not enough. Different application servers have different built-in libraries; web applications need to avoid creating conflicts with these built-in libraries by omitting duplicate or incompatible versions. The XML parser is the classic problem, but a simpler one is whether to include packages such as the JavaMail API in mail.jar packages, which all J2EE servers include. WAR files built for a pure web server such as Tomcat need to include those libraries. Versions built for a full J2EE server should omit them. We could generate the different WAR files with different declarations of the WAR task, each including different libraries. Alternatively, we can write a reusable target that takes a path or a reference to fileset, listing all the libraries to include, and invoke it with <antcall>. Even better, we can take advantage of the if/unless attributes on patternsets to allow for conditional inclusion or exclusion of files. We will postpone this work until we get to deployment in chapter 18, and actually have to start worrying about supporting different target systems.
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