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See the License for the specific language governing permissions and limitations under the License. --> <html> <head> <meta http-equiv="Content-Language" content="en-us"></meta> <link rel="stylesheet" type="text/css" href="../stylesheets/style.css"> <title>AntLib</title> </head> <body> <h2><a name="antlib">Antlib</a></h2> <h3>Description</h3> <p> An antlib file is an xml file with a root element of "antlib". Antlib's elements are ant definition tasks - like and <a href="../CoreTasks/taskdef.html">Taskdef</a>, or any ant task that extends <code>org.apache.tools.ant.taskdefs.AntlibDefinition</code>. </p> <p> The current set of declarations bundled with Ant that do this are: </p> <ol> <li><a href="../CoreTasks/typedef.html">Typedef</a> </li> <li><a href="../CoreTasks/taskdef.html">Taskdef</a> </li> <li><a href="../CoreTasks/macrodef.html">Macrodef</a> </li> <li><a href="../CoreTasks/presetdef.html">Presetdef</a> </li> <li><a href="../OptionalTasks/scriptdef.html">Scriptdef</a> </li> </ol> <p> A group of tasks and types may be defined together in an antlib file. For example the file <i>sample.xml</i> contains the following: </p> <blockquote> <pre> <?xml version="1.0"?> <antlib> <typedef name="if" classname="org.acme.ant.If"/> <typedef name="scriptpathmapper" classname="org.acme.ant.ScriptPathMapper" onerror="ignore"/> <macrodef name="print"> <attribute name="file"/> <sequential> <concat taskname="print"> <fileset dir="." includes="@{file}"/> </concat> </sequential> </macrodef> </antlib> </pre> </blockquote> <p> It defines two types or tasks, <i>if</i> and <i>scriptpathmapper</i>. This antlib file may be used in a build script as follows: </p> <blockquote> <pre> <typedef file="sample.xml"/> </pre> </blockquote> <p> The other attributes of <code><typedef></code> may be used as well. For example, assuming that the <i>sample.xml</i> is in a jar file <i>sample.jar</i> also containing the classes, the following build fragment will define the <i>if</i> and <i>scriptpathmapper</i> tasks/types and place them in the namespace uri <i>samples:/acme.org</i>. </p> <blockquote> <pre> <typedef resource="org/acme/ant/sample.xml" uri="samples:/acme.org"/> </pre> </blockquote> <p> The definitions may then be used as follows: </p> <blockquote> <pre> <sample:if valuetrue="${props}" xmlns:sample="samples:/acme.org"> <sample:scriptpathmapper language="beanshell"> some bean shell </sample:scriptpathmapper> </sample:if> </pre> </blockquote> <h3><a name="antlibnamespace">Antlib namespace</a></h3> <p> The name space URIs with the pattern <b>antlib:<i>java package</i></b> are given special treatment. </p> <p> When ant encounters a element with a namespace URI with this pattern, it will check to see if there is a resource of the name <i>antlib.xml</i> in the package directory in the default classpath. </p> <p> For example, assuming that the file <i>antcontrib.jar</i> has been placed in the directory <i>${ant.home}/lib</i> and it contains the resource <i>net/sf/antcontrib/antlib.xml</i> which has all antcontrib's definitions defined, the following build file will automatically load the antcontrib definitions at location <i>HERE</i>: </p> <blockquote> <pre> <project default="deletetest" xmlns:antcontrib="antlib:net.sf.antcontrib"> <macrodef name="showdir"> <attribute name="dir"/> <sequential> <antcontrib:shellscript shell="bash"> <!-- HERE --> ls -Rl @{dir} </antcontrib:shellscript> </sequential> </macrodef> <target name="deletetest"> <delete dir="a" quiet="yes"/> <mkdir dir="a/b"/> <touch file="a/a.txt"/> <touch file="a/b/b.txt"/> <delete> <fileset dir="a"/> </delete> <showdir dir="a"/> </target> </project> </pre> </blockquote> <p> The requirement that the resource is in the default classpath may be removed in future versions of Ant.</p> </p> <h3><a name="loadFromInside">Load antlib from inside of the buildfile</a></h3> <p> If you want to seperate the antlib from your local Ant installation, e.g. because you want to hold that jar in your projects SCM system, you have to specify a classpath, so that Ant could find that jar. The best solution is loading the antlib with <tt><taskdef></tt>. </p> <blockquote> <pre> <project xmlns:<font color="green">antcontrib</font>="<font color="red">antlib:net.sf.antcontrib</font>"> <taskdef uri="<font color="red">antlib:net.sf.antcontrib</font>" resource="net/sf/antcontrib/antlib.xml" classpath="path/to/ant-contrib.jar"/> <target name="iterate"> <<font color="green">antcontrib</font>:for param="file"> <fileset dir="."/> <sequential> <echo message="- @{file}"/> </sequential> </antcontrib:for> </target> </project> </pre> </blockquote> <h3><a name="currentnamespace">Current namespace</a></h3> <p> Definitions defined in antlibs may be used in antlibs. However the namespace that definitions are placed in are dependent on the <code><typedef></code> that uses the antlib. To deal with this problem, the definitions are placed in the namepace URI <i>ant:current</i> for the duration of the antlib execution. For example the following antlib defines the task <code><if></code>, the type <code><isallowed></code> and a macro <code><ifallowed></code> that makes use of the task and type: </p> <blockquote> <pre> <antlib xmlns:current="ant:current"> <taskdef name="if" classname="org.acme.ant.If"/> <typedef name="isallowed" classname="org.acme.ant.Isallowed"/> <macrodef name="ifallowed"> <attribute name="action"/> <element name="do"/> <sequential> <current:if> <current:isallowed test="@{action}"/> <current:then> <do/> </current:then> </current:if> </sequential> </macrodef> </antlib> </pre> </blockquote> <h3>Other examples and comments</h3> <p> Antlibs may make use of other antlibs. </p> <p> As the names defined in the antlib are in the namespace uri as specified by the calling <code><typedef></code> or by automatic element resolution, one may reuse names from core ant types and tasks, provided the caller uses a namespace uri. For example, the following antlib may be used to define defaults for various tasks: </p> <blockquote> <pre> <antlib xmlns:antcontrib="antlib:net.sf.antcontrib"> <presetdef name="javac"> <javac deprecation="${deprecation}" debug="${debug}"/> </presetdef> <presetdef name="delete"> <delete quiet="yes"/> </presetdef> <presetdef name="shellscript"> <antcontrib:shellscript shell="bash"/> </presetdef> </antlib> </pre> </blockquote> <p> This may be used as follows: </p> <blockquote> <pre> <project xmlns:local="localpresets"> <typedef file="localpresets.xml" uri="localpresets"/> <local:shellscript> echo "hello world" </local:shellscript> </project> </pre> </blockquote> </body> </html>