vb.net barcode maker UNDERSTANDING ANT DATATYPES AND PROPERTIES in Java

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UNDERSTANDING ANT DATATYPES AND PROPERTIES
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ADDITIONAL ANT DATATYPES
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We have covered the Ant datatypes that are frequently used by Ant tasks, but there are several other datatypes that are used by a smaller number of tasks. These datatypes are no less important, of course, when you need them for your build. Rather than provide detailed discussion of these types here, we show them with the appropriate tasks elsewhere in this book.
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ZipFileset Building an archive that contains the contents of other archive files can be accomplished using the <zipfileset> datatype. A <zipfileset> not only allows putting the contents of one archive inside another, it also provides the capability to prefix an archives contents within another. For example, when building the WAR file for our search engine application, we incorporate the Javadoc HTML in an api subdirectory and our documentation under the help directory. These were not the directory names used during our build process, yet the WAR file will have these names in its structure.
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<war destfile="dist/antbook.war" webxml="web.xml"> <classes dir="${build.classes.dir}"/> . . . <fileset dir="web"/> <zipfileset dir="${javadoc.dir}" prefix="api" /> <zipfileset dir="${build.dir}/webdocs" prefix="help"/> </war>
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The tasks that support the ZipFileset datatype are <zip>, <jar>, <war>, and <ear>. 3.11.2 Dirset The fileset datatype incorporates both files and directories, but some tasks prefer to only operate on directories. The <dirset> datatype is used in only the <javadoc> and <pathconvert> tasks. The path datatype also supports a nested <dirset>, which allows for easier construction of classpath elements for multiple directories. Filelist Recall that a fileset is an unordered collection of files and directories. When concatenating files or doing other operations that require a specific order, the filelist datatype comes in handy. The filelist datatype is supported in the <concat>, <dependset>, and <pathconvert> tasks, as well as a nested element within the <path> datatype.
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ClassFileset The ClassFileset datatype can be used by reference wherever a fileset is used. It provides only the .class files that are explicitly referenced by a set of specified classes. This can be important when constructing a minimal archive, for example, and ship only the classes used. It is important to note, however, that classes referenced via reflection will not be considered dependencies, and therefore overlooked by ClassFileset.
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PROPERTIES
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Perhaps the most important concept to fully understand in Ant is its notion of properties. Properties are loosely analogous to variables in that they are mappings between names and values and, not coincidentally, are very similar conceptually to java. util.Properties. Ant provides the built-in properties listed in table 3.7.
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Table 3.7 Name ant.file ant.home ant.java.version ant.project.name ant.version basedir Built-in properties Definition The absolute path of the build file. The path to executing version of Ant s root directory. The JVM version Ant detected; currently it can hold the values 1.1, 1.2, 1.3, and 1.4. The name of the project that is currently executing; it is set in the name attribute of <project>. The version of Ant. The absolute path of the project's basedir (as set with the basedir attribute of <project>).
Ant properties are typically, depending on the context of their use, denoted by ${property.name} within the build file. To examine the properties provided in table 3.7, we can use the <echo> task:
<target name="echo"> <echo message="ant.file = ${ant.file}"/> <echo message="ant.home = ${ant.home}"/> <echo message="ant.java.version = ${ant.java.version}"/> <echo message="ant.version = ${ant.version}"/> <echo message="basedir = ${basedir}"/> </target>
This generates output similar to this:
echo: [echo] [echo] [echo] [echo] [echo] ant.file = C:\AntBook\Sections\Learning\datatypes\properties.xml ant.home = c:\AntBook\jakarta-ant-1.5Beta1 ant.java.version = 1.3 ant.version = Apache Ant version 1.5Beta1 compiled on April 30 2002 basedir = C:\AntBook\Sections\Learning\datatypes
UNDERSTANDING ANT DATATYPES AND PROPERTIES
This example was run with the -f command-line option to specify a different build file name as shown in ant.file. By the time of publication, many of us will probably see 1.4 for ant.java.version. The latest release version of Ant at the time of writing was version 1.5 Beta, but it will be an official release by the time of publication. The basedir property defaults to the path of the current build file, and can be changed by specifying basedir on the <project> element or controlled externally using property overrides as discussed shortly. Implicitly, all JVM system properties are provided as Ant properties, allowing valuable information such as the users home directory path and the current username to be utilized as desired. The JVM system properties will vary from platform-to-platform, but there are many that you can rely on, for example
<echo message="user.name = ${user.name}"/> <echo message="user.home = ${user.home}"/> <echo message="java.home = ${java.home}"/>
Here are sample results from running this code on a Windows machine:
[echo] user.name = erik [echo] user.home = C:\Documents and Settings\erik [echo] java.home = c:\jdk1.3.1\jre
Setting properties with the <property> task The <property> task allows build files to define their own sets of custom properties. The most common variants of creating properties are Name/value attributes Load a set of properties from a properties file Load environment variables Setting and using a simple property A typical development-versus-production build difference is in the enabling or disabling of debug mode on compilation. Since we want a single build file with a single <javac> task, we use a property to parameterize it. We define a property named build.debug and set its value to on (the value that <javac> uses on its debug attribute).
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