Unique Stack Name - Preprovision

var EnsureUniqueName = Class.create();
EnsureUniqueName.prototype = Object.extendsObject(sn_cmp.PolicyExecutionBase, {
    customScript : function(formData){
        // Manipulation of form parameters are supported. Changes in any other attributes
        // will be ignored.
        // The data available for manipulation is as follows:
        // Form Data -  for example: StackName can be accessed through formData.StackName
        // formData.StackName = "MyStack";
        // User Data  - for example: User Id can be accessed through this.parameters.userData
        // if(this.parameter.userData.userId == 'servicenowuserId')
        //this.info("id = " + formData.StackName);

        // Set debugging information to be sent to gs.info with searchable prefix
        var thisDebug = true;
        var thisDebugPrefix = "ZZZZZ - ";

        // Deconstruct the incoming name string back to to nPrefix and nConvention3
        var nPrefix = formData.StackName.substring(0, 1);
        var nConvention3 = formData.StackName.substring(2, 9);

        // Log the current name if thisDebug = true
        if (thisDebug) { gs.info("" + thisDebugPrefix + formData.StackName); }

        // Check the name against existing stack names
        var nameCount = new GlideRecord('sn_cmp_stack');
        nameCount.addQuery('name',formData.StackName);
        nameCount.query();
        if (thisDebug) { gs.info("" + thisDebugPrefix + "existing stacks with this name: " + nameCount.getRowCount()); }

        while (nameCount.getRowCount() > 0) {
            // If execution ends up here, increment the timestamp by 1 until we find something unique
            t = "00000000" + (++nConvention3);
            nConvention3 = t.substr(t.length - 8);
            formData.StackName = "" + nPrefix + nConvention3;
            if (thisDebug) { gs.info("" + thisDebugPrefix + formData.StackName); }

            nameCount.addQuery('name',formData.StackName);
            nameCount.query();
            if (thisDebug) { gs.info("" + thisDebugPrefix + "existing stacks with this name: " + nameCount.getRowCount()); }
        }

        return formData;
    },
    execute: function() {
        if(this.parameters !=  null && this.parameters.formData != null){
            var inputData = JSON.parse(JSON.stringify(this.parameters.formData));
            var outputFormData = this.customScript(inputData);
            if( outputFormData != null){
                this.parameters.formData = outputFormData;
            }
        }
        var output = {};
        output.answer = this.parameters;
        return JSON.stringify(output);
    },
    type : 'EnsureUniqueName'
});

var EnsureUniqueNameObj = new EnsureUniqueName(inputAttributes);
var outputParams = EnsureUniqueNameObj.execute();
gs.info( "Output of script is = " + outputParams);