How do you retrieve an argument value in JavaScript when running from Ant?

Within Ant, I am creating a macrodef that utilizes javascript to handle the task of validating a given timezone.

<macrodef name="validateTimeZone">
    <attribute name="zone" />
    <sequential>
        <echo>result: ${envTZResult}</echo>
        <echo>  validating timezone: @{zone}</echo>
        <script language="javascript"><![CDATA[
            importClass(java.util.TimeZone);
            importClass(java.util.Arrays);
            var tz = project.getProperty("zone");
            println("    got attribute: " + tz);
            var result = Arrays.asList(TimeZone.getAvailableIDs()).contains(tz); // Check if timezone is valid
            project.setProperty("zoneIsValid", result);
        ]]> 
        </script>
    </sequential>
</macrodef>

An issue arises with project.getProperty() as it does not retrieve the values of passed attributes. Is there a method to access the value of the attribute from within the javascript code?

javajavascriptant

Answer №1

It turns out that I had been utilizing the incorrect tag type. When using scripting to define an ant task, I should have utilized scriptdef instead of macrodef. By using scriptdef, there are pre-existing objects available to access both the attributes and nested elements within your task.

Here's how you can access attributes from javascript in Ant:

<scriptdef name="validateTimeZone" language="javascript">
    <attribute name="zone" />
    <![CDATA[
        importClass(java.util.TimeZone);
        importClass(java.util.Arrays);
        var tz = attributes.get("zone"); //get attribute defined for scriptdef
        println("    got attribute: " + tz);
        var result = Arrays.asList(TimeZone.getAvailableIDs()).contains(tz); //testing if timezone is known
        project.setProperty("zoneIsValid", result);
    ]]> 
</scriptdef>

Answer №2

To optimize your code, consider defining a property with an attribute as its value:

<macrodef name="validateTimeZone">
    <attribute name="zone" />
    <sequential>
        <echo>result: ${envTZResult}</echo>
        <echo>  validating timezone: @{zone}</echo>
        <!-- update to use local with ant 1.8.x -->
        <local name="zone"/>
        <property name="zone" value="@{zone}"/>
        <script language="javascript"><![CDATA[
            importClass(java.util.TimeZone);
            importClass(java.util.Arrays);
            var tz = project.getProperty("zone");
            println("    got attribute: " + tz);
            var result = Arrays.asList(TimeZone.getAvailableIDs()).contains(tz); //check if timezone is recognized
            project.setProperty("zoneIsValid", result);
        ]]> 
        </script>
    </sequential>
</macrodef>

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