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<target name="myTarget" unless="${eclipserunning}"> do something non-Eclipse related </target>
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One build target can explicitly call another build target in the same build script using the <antcall> task, or in a different build script using the <ant> task Alternatively, one target can depend on another target to achieve a similar effect, but only within the same build script If target A depends on target B, which in turn depends on target C (see Figure 19 1), then if you execute target A, the Ant framework will execute first target C, then target B, and finally target A This same effect could be achieved by having target A call target B, which in turn calls target C
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Figure 19 1
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Example build target dependencies
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The difference between these two approaches lies in how many times a target is executed For example, let s assume a more complicated script in which A depends on B1, B2, and B3, and each of these depends on C In this case, if you execute A then the Ant framework will execute C first, then B1, B2, and B3 in some undetermined order, and finally A Note that in this case, target C was only executed once and not three times as you might expect
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1913 Build tasks
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Build targets are composed of a sequence of tasks to be executed There are many different types of Ant tasks, some of which are listed on the next three pages In this list, tasks with names that start with eclipse are not built into Ant, but are available either as part of Eclipse or as plug-ins for Eclipse (see
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CHAPTER 19
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Building a Product
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Section 1917, Ant extensions, on page 710) Much more complete documentation for Ant tasks can be found on the Apache Ant Web site (antapacheorg/) and in the Eclipse Help
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ant Runs Ant on another build file For example:
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<ant antfile="subproject/subbuildxml" dir="subproject" target="compile"/>
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By default, all the properties in the current build script will be available in the build script being called Alternatively, you can set the inheritAll attribute to false and only user properties (ie, those passed on the command line) will be available to the build script being called In either case, the set of properties being passed will override any properties with the same name in the build script being called
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<ant antfile="subproject/subbuildxml" dir="subproject" inheritAll="false" target="compile"/>
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antcall Calls another target within the same build file (see Section
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1915, <antcall> task, on page 706) For example:
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<antcall target="doSomethingElse"> <param name="fooname" value="someValue"/> </antcall>
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copy Copies a file or a set of files specified by a <fileset> to a new file or directory By default, files are only copied if the source file is newer than the destination file, or when the destination file does not exist However, you can explicitly overwrite files with the overwrite attribute For example:
<copy file="myfiletxt" todir="/some/other/dir"/>
<copy todir="/new/dir"> <fileset dir="src_dir" includes="**/*java"/> </copy>
The <fileset> structure in the code above specifies the files to be included in the operation The two asterisks (**) indicate that the operation should include files in the directory specified by the dir attribute, along with files in any of its subdirectories to an infinite depth
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191 A Brief Introduction to Ant
delete Deletes a single file, a specified directory and all its files and subdirectories, or a set of files specified by a <fileset> (see copy for more information about <filesets>) When specifying a set of files, empty directories are not removed by default To remove empty directories, use the includeEmptyDirs attribute For example:
<delete dir="lib"/>
<delete> <fileset dir="" includes="**/*bak"/> </delete>
echo Echoes a message to the current loggers and listeners, which in
this case means the Console view For example:
<echo message="Hello, world"/> <echo level="info">Hello, World</echo>
echoproperties Echoes all Ant properties to the current loggers and listeners, which in this case means the Console view Very useful for debugging Ant scripts eclipsebuildScript Generates an Ant script to build a specified
plug-in, fragment, or feature
eclipseconvertPath Converts a filesystem path to a resource path,
and vice versa, assigning the result to the specified property For example:
<eclipseconvertPath fileSystemPath="${basedir}" property="myPath"/>
<eclipseconvertPath resourcePath="MyProject/MyFile" property="myPath"/>
eclipsefetch Generates an Ant script that will retrieve content from a CVS repository eclipsegenerateFeature Generates a feature that will contain the specified elements This task is typically used to build an RCP application from a product configuration file eclipseincrementalBuild Triggers an incremental build of either a project or the entire workspace, depending on whether the project attributed is specified eclipsejarProcessor Signs and packs JAR files