Hi all, my name is Hubert A. Klein Ikkink. Not a very common name, right? To make things easier I just picked the first letters of my firstname and surname and came up with haki. So there you have it, now I am also known as Mr. Haki or mrhaki for short. You can read more blog postings at www.mrhaki.com. I am a passionate Groovy and Java developer based in Tilburg, The Netherlands. My goal is to write clean, elegant, user-centered and high quality software. You can find me on Google+ and Twitter. Hubert is a DZone MVB and is not an employee of DZone and has posted 167 posts at DZone. You can read more from them at their website. View Full User Profile

Gradle Goodness: Unpacking an Archive

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To create an archive with Gradle is easy. We have several tasks like Zip, Tar, Jar, War and Ear to create a new archive. But there is no UnZip or UnTar to unpack an archive in Gradle. To unpack an archive we must use the Copy task and copy the contents of the archive to a specified destination directory. In Gradle we can use the zipTree() method to access the contents of an archive. So in our copy definition the source is the contents of the archive we access with the zipTree() method.

In the following build file we see a simple task to unzip a ZIP file with the name dist.zip in the directory src/dists. We unpack the contents to the directory build/unpacked/dist:

task unzip(type: Copy) {
    def zipFile = file('src/dists/dist.zip')
    def outputDir = file("${buildDir}/unpacked/dist")

    from zipTree(zipFile)
    into outputDir

The good thing is that tasks of type Copy automatically support Gradle's incremental build support. This means that if the task has been executed once and the dist.zip file and output in the directory build/unpacked/dist has not change the task is up-to-date and isn't executed.

We get the following output if we run the task twice:

$ gradle unzip
Total time: 2.867 secs
unzip mrhaki$ gradle unzip
:unzip UP-TO-DATE
Total time: 2.606 secs




Published at DZone with permission of Hubert Klein Ikkink, author and DZone MVB. (source)

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