Thanks Dominique, I'll let you know how it works out, Bill.
----- Original Message -----
From: "Dominique Devienne" <[EMAIL PROTECTED]>
To: "'Ant Users List'" <[EMAIL PROTECTED]>
Sent: Thursday, January 23, 2003 10:43 AM
Subject: RE: Which task
> <available> tells you if it's found in the searchpath, but won't tell you
> the actual full pathname. This little task will. --DD
>
> package com.lgc.buildmagic;
>
> import java.io.File;
> import java.io.IOException;
>
> import org.apache.tools.ant.Task;
> import org.apache.tools.ant.Project;
> import org.apache.tools.ant.BuildException;
>
> import org.apache.tools.ant.types.Path;
> import org.apache.tools.ant.types.DirSet;
> import org.apache.tools.ant.types.FileSet;
> import org.apache.tools.ant.types.FileList;
> import org.apache.tools.ant.types.Reference;
>
> /**
> * Attempt to locate a file within a given search path.
> * <p>
> * Unlike <available>, this task returns the full path name to the
> * search file in the specified property, but only if found.
> * <pre>
> * <path id="path" path="${env.PATH}" />
> * <which property="cvs.exe" basename="cvs.exe" searchpathref="path"
> />
> * <fail message="cvs.exe not in PATH!" unless="cvs.exe" />
> * <exec executable="${cvs.exe}" />
> * </pre>
> *
> * @author <a href="mailto:[EMAIL PROTECTED]";>Dominique Devienne</a>
> * @version Sep 2002 - Copyright (c) 2002, Landmark Graphics Corp.
> */
> public class Which
> extends Task {
>
> /** The search path used to find a file. */
> private Path searchpath;
>
> /** The simple name of the file to search. */
> private String basename;
>
> /**
> * The property name to contain the full
> * pathname of the file searched for.
> */
> private String property;
>
> /**
> * Runs the various sub-builds.
> */
> public void execute()
> throws BuildException {
> if (property == null) {
> throw new BuildException("property attribute is required",
> getLocation());
> }
>
> if (searchpath == null) {
> throw new BuildException("No searchpath specified",
> getLocation());
> }
>
> final String[] filenames = searchpath.list();
> final int count = filenames.length;
> if (count < 1) {
> throw new BuildException("Empty searchpath specified",
> getLocation());
> }
>
> for (int i=0; i<count; ++i) {
> File parent = new File(filenames[i]);
> if (!parent.isDirectory()) {
> // Skip non-directories in the search path
> continue;
> }
>
> log("Searching " + parent, Project.MSG_DEBUG);
> File file = new File(parent, basename);
> if (file.exists() && file.isFile()) {
> String fullpath = null;
> try {
> fullpath = file.getCanonicalPath();
> } catch (IOException e) {
> throw new BuildException(e, getLocation());
> }
> getProject().setNewProperty(property, fullpath);
> return;
> }
> }
> }
>
> /**
> * The short name of the file search in the search path.
> *
> * @param basename the short file name
> */
> public void setBasename(String basename) {
> this.basename = basename;
> }
>
> /**
> * Sets the name of the property to contain the full pathname of the
> * file searched for, if found.
> *
> * @param property the name of the property to set.
> */
> public void setProperty(String property) {
> this.property = property;
> }
>
> /**
> * Adds a directory set to the implicit build path.
> * <p>
> * <em>Note that the directories will be added to the build path
> * in no particular order, so if order is significant, one should
> * use a file list instead!</em>
> *
> * @param set the directory set to add.
> */
> public void addDirset(DirSet set) {
> getSearchpath().addDirset(set);
> }
>
> /**
> * Adds a file set to the implicit build path.
> * <p>
> * <em>Note that the directories will be added to the build path
> * in no particular order, so if order is significant, one should
> * use a file list instead!</em>
> *
> * @param set the file set to add.
> */
> public void addFileset(FileSet set) {
> getSearchpath().addFileset(set);
> }
>
> /**
> * Adds an ordered file list to the implicit build path.
> * <p>
> * <em>Note that contrary to file and directory sets, file lists
> * can reference non-existent files or directories!</em>
> *
> * @param list the file list to add.
> */
> public void addFilelist(FileList list) {
> getSearchpath().addFilelist(list);
> }
>
> /**
> * Set the searchpath to be used to find sub-projects.
> *
> * @param s an Ant Path object containing the searchpath.
> */
> public void setSearchpath(Path s) {
> getSearchpath().append(s);
> }
>
> /**
> * Creates a nested build path, and add it to the implicit build path.
> *
> * @return the newly created nested build path.
> */
> public Path createSearchpath() {
> return getSearchpath().createPath();
> }
>
> /**
> * Creates a nested <code><searchpathelement></code>,
> * and add it to the implicit build path.
> *
> * @return the newly created nested build path element.
> */
> public Path.PathElement createSearchpathElement()
> throws BuildException {
> return getSearchpath().createPathElement();
> }
>
> /**
> * Gets the implicit build path, creating it if <code>null</code>.
> *
> * @return the implicit build path.
> */
> private Path getSearchpath() {
> if (searchpath == null) {
> searchpath = new Path(getProject());
> }
> return searchpath;
> }
>
> /**
> * Searchpath to use, by reference.
> *
> * @param r a reference to an Ant Path object containing the
> searchpath.
> */
> public void setSearchpathRef(Reference r) {
> createSearchpath().setRefid(r);
> }
>
> } // END class Which
>
>
> -----Original Message-----
> From: Bill Winspur [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, January 23, 2003 11:04 AM
> To: Ant Users List
> Subject: Re: Which task
>
> I just joined this thread, and missed earlier messages, but... I've been
> looking for a more primitive 'which' functionality on ant, more like the
> unix 'which <file>' command. I'd like to search the host command path,
> available in system property 'java.library.path', asking the question:
> "which directory from classpath x contains file y?". An ideal task would
be
> something like:
>
> <which classpath=${java.library.path} fileSought="myFileName"
> propertySet="hostDir"/>
>
> or
>
> <which fileSought="myFileName" propertySet="hostDir">
> <path ....>
> <pathelement .../>
> ...
> </path>
> </which>
>
> I've checked the faq and browsed the 1.5.1 manual for 1.83 hours, but have
> not found a way to determine a specified file's location on a path. Is
there
> a way to do this in ant ?
>
> Bill Winspur.
>
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