CODEWITHSUNDEEP
ant
janagn
janagn

Reputation: 175

Set ant property when comparing directories

I have two directories that I need to compare for having same files. I succesfully do this as follows:

<fileset dir="d:\test" id="onlyinbar">
    <not>
        <present targetdir="A_DIR"/>
    </not>
</fileset>
<echo>these files are only in bar : ${toString:onlyinbar}</echo>
<fileset dir="A_DIR" id="differentbarfoo">
    <different targetdir="d:\test" ignoreFileTimes="true"/>
</fileset>
<echo>these files are different in bar compared to foo : ${toString:differentbarfoo}</echo>

However, I need to issue an other task if either of these are true. So long the <condition> tag does seem to support only file to file comparison and I cannot see how to assign a property within the <fileset> tag. Help will be appreciated.

Upvotes: 0

Views: 365

Answers (2)

janagn
janagn

Reputation: 175

We needed to avoid any third party contribs for this solution. My major problem was the combination of the tags. We knew that our "tests" i.e fileset tags had to be in the condition but didn't know how. The resourcecount though short out the issue:

<target name="export-report-icons" description="A description">
    <condition property="test2" else="false">
        <or>
            <resourcecount  when="gt" count="0"  property="flength">
                <fileset dir="d:\test" id="onlyinbar">
                    <present targetdir="DIRs_A" present="srconly"/>
                </fileset>
            </resourcecount>
            <resourcecount  when="gt" count="0"  property="flength">
                <fileset dir="DIR_A" id="differentbarfoo">
                    <different targetdir="d:\test" ignoreFileTimes="true"/>
                </fileset>
            </resourcecount>
        </or>
    </condition>
</target>

<target name="copyThis" depends="export-report-icons" if="${test2}">
 ....
</target>

So what this does, sets an OR for the case that one of the two filesets succeeds, the counter wraps the fileset resource so that it can be hosted under the condition and the condition has a property true or false depending on ORed counts. The "copy-This" target executes if the ${test2} is true. Please note that if you set id=test2 it will always qualify as true as in this case it checks for value presence.

Upvotes: 2

Chad Nouis
Chad Nouis

Reputation: 7041

The <union> set operator groups resources from multiple collections into one collection.

Similarly, take a look at <intersect> and <difference>.

You mention "if", which I assume refers to the <if> task from the third-party Ant-Contrib library. Here's an example that echoes if the filesets combined by <union> match any files:

<if>
    <resourcecount when="gt" count="0">
        <union id="Check">
            <resources refid="onlyinbar"/>
            <resources refid="differentbarfoo"/>
        </union>
    </resourcecount>
    <then>
        <echo>There are differences: ${toString:Check}</echo>
    </then>
</if>

Upvotes: 1

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