| filelist/fileset with multiple directory | filelist/fileset with multiple directory 2007-01-24 - By Mikael Sitruk
Regarding the selector suggestion, I have some additional question
1. From my understanding the selector are part of a fileset, but in a fileset
the dir attribute is mandatory and point only to one directory.
So is really a selector the appropriate choice?
2. From the code the selector create a lot of other selector (one per directory
) is it really the best thing to do? I mean in the performance point of view?
3. Won?t you use resource instead of selector? This seems very simetric to the
javaresource (instead of class I'm searching files)
Mikael.S
-----Original Message-----
From: Dominique Devienne [mailto:ddevienne@(protected)]
Sent: Wednesday, 24 January, 2007 22:12
To: Ant Users List
Subject: Re: filelist/fileset with multiple directory
On 1/24/07, Matt Benson <gudnabrsam@(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>
* <or>
* <and>
* <present targetdir="dir#1"/>
* <or>
* <present targetdir="dir#2"/>
* <present targetdir="dir#3"/>
* etc...
* <present targetdir="dir#N"/>
* </or>
* </and>
* <and>
* <present targetdir="dir#2"/>
* <or>
* <present targetdir="dir#3"/>
* <present targetdir="dir#4"/>
* etc...
* <present targetdir="dir#N"/>
* </or>
* </and>
* etc...
* <and>
* <present targetdir="dir#N-1"/>
* <or>
* <present targetdir="dir#N"/>
* </or>
* </and>
* </or>
* </pre>
*/
public class MultiPresentSelector
extends AbstractCompositeSelector {
/** {@(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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