Ant Task check if a file exists

This is to remember what I learned when I customize Liferay SDK plugins.

In my case, I need to read a properties file and then get those values to create portlet. The first thing, I have to validate if the file exists in the folder.

1. Fail Task

<fail message="Files are missing.">
	<condition>
		<not>
			<resourcecount count="1">
		                   <fileset dir="." includes="${properties.file.name}"/>
			</resourcecount>
		</not>
	</condition>
</fail>

http://ant.apache.org/manual/Tasks/fail.html The link shows more examples of Fail task.

2. Available Task

<!-- If the file doesn't exist, it will display the message. -->
<if>
	<not>
		<available file="${properties.file.name}"/>
	</not>
	<then>
		<echo message="${properties.file.name} doesn't exist." />
	</then>
</if>

https://ant.apache.org/manual/Tasks/available.html The link shows more examples of Fail task.