Description
Check whether an extension is present in a fileset or an extensionSet.
If the extension is present then a property is set.
Note that this task
works with extensions as defined by the "Optional Package" specification.
For more information about optional packages, see the document
Optional Package Versioning in the documentation bundle for your
Java2 Standard Edition package, in file
guide/extensions/versioning.html or online at
http://java.sun.com/j2se/1.3/docs/guide/extensions/versioning.html.
See the Extension and ExtensionSet documentation for further details
Parameters
| Attribute |
Description |
Required |
| property |
The name of property to set if extensions is available. |
Yes |
| file |
The file to check for extension |
No, one of file, nested
ExtensionSet or nested fileset must be present. |
Parameters specified as nested elements
extension
Extension the extension
to search for.
fileset
FileSets are used to select
sets of files to check for extension.
extensionSet
ExtensionSets is the set
of extensions to search for extension in.
Examples
Search for extension in single file
<jarlib-available property="myext.present" file="myfile.jar">
<extension
extensionName="org.apache.tools.ant"
specificationVersion="1.4.9"
specificationVendor="Apache Software Foundation"/>
</jarlib-available>
Search for extension in single file referencing external Extension
<extension id="myext"
extensionName="org.apache.tools.ant"
specificationVersion="1.4.9"
specificationVendor="Apache Software Foundation"/>
<jarlib-available property="myext.present" file="myfile.jar">
<extension refid="myext"/>
</jarlib-available>
Search for extension in fileset
<extension id="myext"
extensionName="org.apache.tools.ant"
specificationVersion="1.4.9"
specificationVendor="Apache Software Foundation"/>
<jarlib-available property="myext.present">
<extension refid="myext"/>
<fileset dir="lib">
<include name="*.jar"/>
</fileset>
</jarlib-available>
Search for extension in extensionSet
<extension id="myext"
extensionName="org.apache.tools.ant"
specificationVersion="1.4.9"
specificationVendor="Apache Software Foundation"/>
<jarlib-available property="myext.present">
<extension refid="myext"/>
<extensionSet id="exts3">
<libfileset
includeUrl="false"
includeImpl="true"
dir="lib">
<include name="*.jar"/>
</libfileset>
</extensionSet>
</jarlib-available>
Source: Apache Ant
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