Automatically remove explicit package declarations with import statements in Java

Question

I have a project created by others that includes thousands of class files and has the package names explicitly typed out for every reference to any of their classes. It look

Answer 1

I had the same problem with axis generated files, and I wrote a small groovy script to do this. I doesn't do everything (you have to use organize imports in eclipse after you run it), and I haven't tested it very well, so use it carefully. It's also limited to lowercase package names and camel-cased class names, but it may be a good starting point

def replaceExplicitPackageNamesInFile(File javaFile){
 eol = org.codehaus.groovy.tools.Utilities.eol()

 newFile = ""
 explicitImportExpr = /([^\w])(([a-z0-9]+\.)+)([A-Z][a-zA-Z0-9]+)/
 imports = ""
 javaFile.eachLine { 
  line = it.replaceAll(explicitImportExpr, {
   Object [] match ->
   imports += "import ${match[2]+match[-1]};${eol}"
   match[1]+match[-1]
  })
  newFile += line+"${eol}" 
 }
 newFile2 = ""
 newFile.eachLine { line ->
  newFile2 +=
   line.replaceAll(/(^\s*package.*$)/, {
    Object [] match ->
    match[0] + eol + imports
   } ) + eol
 }
 javaFile.setText(newFile2)
}

def replaceExplicitPackageNamesInDir(File dir){
 dir.eachFileRecurse {
  if (it.isFile() && it.name ==~ /.*\.java\z/){
   println "Processing ${it.absolutePath - dir.absolutePath}"
   replaceExplicitPackageNamesInFile(it)
  }
 }
}