"Utilize JavaScript for graceful error handling in your project with

I am trying to implement an Ant task that involves adding JavaScript code. I want the success or failure of the target to be determined by the results of some logic executed in the JavaScript:

<target name="analyze">
    <script language="javascript">
    <![CDATA[
            importClass(java.io.File);
            importClass(java.io.FileReader)
            importClass(java.io.BufferedReader)

            String.prototype.startsWith = function(str) {
                return (this.indexOf(str) === 0);
            }

            String.prototype.endsWith = function(str) {
                var lastIndex = this.lastIndexOf(str);
                return (lastIndex != -1) && (lastIndex + str.length == this.length);
            }

            //setting up the source directory
            srcDir = project.getProperty("MY_HOME") + "/foo/src";

            if(srcDir.startsWith("/foo")) { 
            //TARGET SHOULD PASS
            } else { 
            //TARGET SHOULD FAIL
            }

    ]]>
    </script>
</target>

Answer №1

One way to gracefully exit Ant is by utilizing the Exit API, however this may result in a messy stack trace. A more elegant solution would involve setting a property in the javascript code and then checking it using the fail task:

JavaScript snippet:

project.setProperty( "javascript.fail.message", "An error occurred" );

In your Ant script, right after the execution of the JavaScript code:

<fail if="javascript.fail.message" message="${javascript.fail.message}" />

Answer №2

New objective:

<target name="stopit"><fail/></target>

Code snippet:

`project.executeTarget("stopit");`

Not yet verified. Refer to the documentation for more information.

Answer №3

Completing this task can be achieved by using a single JavaScript block in your code.


    <script type="text/javascript">
        <![CDATA[
                let errorTask = project.createTask("error");
                errorTask.setMessage("An error has occurred");
                errorTask.perform();
    ]]>
    </script>

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