Re: Reading file attributes

[Erik Hatcher]

On Sep 28, 2004, at 5:04 AM, Lennart Hellström (HF/EBC) wrote:
I want to copy a file to a destination file only if the destination 
file is not readonly (it might be checked in on the version control 
system)

I tried using <copy> with failOnError="false" but strangely the build 
fails anyway when the destination file is readonly.

Is there some way to look at the file's attributes before deciding to 
copy or not?
<Attrib> seems to only change the file attributes, and that's not what 
I want.
There may be other ways to do this, but as an example of writing a 
custom selector I do this:

  <typedef name="readonly"
           classname="ReadOnlySelector"
           classpath="build/classes"
  />
  <copy todir="build/copy">
    <fileset dir="src">
      <readonly/>
    </fileset>
  </copy>
Where ReadOnlySelector is this:
import org.apache.tools.ant.types.selectors.FileSelector;
import org.apache.tools.ant.BuildException;
import java.io.File;
public class ReadOnlySelector implements FileSelector {
  public boolean isSelected(File basedir,
                            String filename,
                            File file) throws BuildException {
    return !file.canWrite() && file.canRead();
  }
}

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