Re: filelist/fileset with multiple directory

[Dominique Devienne]

On 1/24/07, Matt Benson <[EMAIL PROTECTED]> wrote:

If we can think of an elegant way to design this, this
question comes up enough that it might be useful to
include such a selector in Ant core.

This is not exactly the same selector, but close enough that the code
should be trivial to adapt to this new particular need. Stefan's
pseudo-code selector is not far from the pseudo-code selector in the
javadoc below. --DD

import java.io.File;

import java.util.List;
import java.util.ArrayList;
import java.util.StringTokenizer;

import org.apache.tools.ant.Project;
import org.apache.tools.ant.BuildException;

import org.apache.tools.ant.types.Parameter;

import org.apache.tools.ant.types.selectors.FileSelector;
import org.apache.tools.ant.types.selectors.OrSelector;
import org.apache.tools.ant.types.selectors.AndSelector;
import org.apache.tools.ant.types.selectors.PresentSelector;

/**
* A selector that looks whether the given file from the source directory
* exists in more than one of the target directories, and returns
* <code>true</code> in this condition only.
* <p>
* This selector is useful when one is attempting to partition a directory
* hierarchy into many separate independent directory hierarchies, to find
* the <em>duplicate</em> files of the source hierarchy which were put into
* more than one of the target hierarchies.
* <p>
* Equivalent to the following composite selector:
* <pre>
*   &lt;or&gt;
*     &lt;and&gt;
*       &lt;present targetdir="dir#1"/&gt;
*       &lt;or&gt;
*         &lt;present targetdir="dir#2"/&gt;
*         &lt;present targetdir="dir#3"/&gt;
*         etc...
*         &lt;present targetdir="dir#N"/&gt;
*       &lt;/or&gt;
*     &lt;/and&gt;
*     &lt;and&gt;
*       &lt;present targetdir="dir#2"/&gt;
*       &lt;or&gt;
*         &lt;present targetdir="dir#3"/&gt;
*         &lt;present targetdir="dir#4"/&gt;
*         etc...
*         &lt;present targetdir="dir#N"/&gt;
*       &lt;/or&gt;
*     &lt;/and&gt;
*     etc...
*     &lt;and&gt;
*       &lt;present targetdir="dir#N-1"/&gt;
*       &lt;or&gt;
*         &lt;present targetdir="dir#N"/&gt;
*       &lt;/or&gt;
*     &lt;/and&gt;
*   &lt;/or&gt;
* </pre>
*/
public class MultiPresentSelector
            extends AbstractCompositeSelector {

   /** [EMAIL PROTECTED] */
   protected FileSelector configure(Parameter[] params) {
       String path = null;
       String suffix = "";

       for (int i = 0; i < params.length; ++i) {
           Parameter param = params[i];
           if (param.getName().equals("path")) {
               path = param.getValue();
           }
           else if (param.getName().equals("suffix")) {
               suffix = param.getValue();
           }
           else {
               throw new BuildException("Unknown param: " + param.getName());
           }
       }

       if (path == null) {
           throw new BuildException("Unset required param: path");
       }

       File[] files = getFiles(path, suffix);
       if (files.length < 2) {
           throw new BuildException("Empty selector");
       }

       OrSelector or = new OrSelector();
       for (int i = 0; i < files.length - 1; ++i) {
           AndSelector and = new AndSelector();
           PresentSelector present = new PresentSelector();
           present.setTargetdir(files[i]);
           and.appendSelector(present);
           OrSelector or2 = new OrSelector();
           for (int j = i+1; j < files.length; ++j) {
               PresentSelector present2 = new PresentSelector();
               present2.setTargetdir(files[j]);
               or2.appendSelector(present2);
           }
           and.appendSelector(or2);
           or.appendSelector(and);
       }

       return or;
   }

   private File[] getFiles(String path, String suffix) {
       List files = new ArrayList(32);
       StringTokenizer st = new StringTokenizer(path, File.pathSeparator);
       while (st.hasMoreTokens()) {
           File file = new File(st.nextToken() + suffix);
           if (file.isDirectory()) {
               files.add(file);
           }
       }
       return (File[])files.toArray(new File[0]);
   }

}

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