Gradleでタスクから別のタスクを呼び出す

build.gradle

def zipFile =''
task downloadZip(type: MyDownload) {
    sourceUrl = 'https://dl.dropboxusercontent.com/u/645223/gradle/quickstart.zip'
    target = file("${temporaryDir}/quickstart.zip")
    zipFile = target
}

class MyDownload extends DefaultTask {
    @Input
    String sourceUrl

    @OutputFile
    File target

    @TaskAction
    void download() {
       ant.get(src: sourceUrl, dest: target)
    }
}

task unzip(type: Copy) {
    def outputDir = file("build")
    from zipTree(zipFile)
    into outputDir
}

task deploy {
    tasks.downloadZip.execute()
    tasks.unzip.execute()
}