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Learn how to effectively retrieve a filename without its extension in Apache Velocity templates. This guide provides simple steps for string manipulation to help streamline your template development process.
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How to Get Filename Without Extension in Apache Velocity Template Language

In the world of software development and web design, utilizing templates can significantly boost productivity. However, one challenge developers often face is manipulating strings to extract relevant information. A common requirement is to obtain the filename without its extension. In this post, we'll address how to achieve this specifically in Apache Velocity Template Language (VTL).

The Problem at Hand

Imagine you're working in WebStorm and need to define a template that utilizes filenames for various assets. For instance, you want to reference a template file named example.tmpl, a JavaScript file example.js, and a CSS file example.css. You desire to build your templates dynamically and make use of the filename but without the extension.

Your goal is to define your template like this:

[[See Video to Reveal this Text or Code Snippet]]

The challenge is how to manipulate the variable ${FILE_NAME} to derive just example—the filename without the extension.

The Solution

To tackle this issue, you can leverage string operations available in Apache Velocity. Below, you'll find a step-by-step guide on how to extract the filename without its extension.

Step 1: Determine the Length of the Filename

First, you need to calculate the length of the filename string without the extension. This can be accomplished by subtracting the length of the extension from the total length of the filename.

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Here, we assume the filename always ends with .js, which is why we subtract 3.

Step 2: Extract the Filename

Next, you'll use the substring method to extract the actual filename:

[[See Video to Reveal this Text or Code Snippet]]

This will yield the filename without the extension. For example, if $NAME is example.js, then $fileName will now store example.

Alternative Method: Using Last Index of

If your filename might have different extensions or you want to make your solution more dynamic, you can use the lastIndexOf method:

[[See Video to Reveal this Text or Code Snippet]]

This method identifies the last period in the filename and ensures that whatever comes after it is treated as the extension, making the solution more adaptable to variable filenames.

Conclusion

Now you have the tools to extract filenames without their extensions in Apache Velocity templates. Whether you're working with specific extensions or allowing for flexibility in filenames, these string manipulation methods pave the way for more efficient template management. Utilize these techniques, and you'll streamline your development process significantly!

Remember that mastering these details can not only save you time but also enhance the performance and organization of your projects. Happy coding!