subant.java

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        } finally {
            ant = null;
        }
    }

    /**
     * This method builds the file name to use in conjunction with directories.
     *
     * <p>Defaults to "build.xml".
     * If <code>genericantfile</code> is set, this attribute is ignored.</p>
     *
     * @param  antfile the short build file name. Defaults to "build.xml".
     */
    public void setAntfile(String antfile) {
        this.antfile = antfile;
    }

    /**
     * This method builds a file path to use in conjunction with directories.
     *
     * <p>Use <code>genericantfile</code>, in order to run the same build file
     * with different basedirs.</p>
     * If this attribute is set, <code>antfile</code> is ignored.
     *
     * @param afile (path of the generic ant file, absolute or relative to
     *               project base directory)
     * */
    public void setGenericAntfile(File afile) {
        this.genericantfile = afile;
    }

    /**
     * Sets whether to fail with a build exception on error, or go on.
     *
     * @param  failOnError the new value for this boolean flag.
     */
    public void setFailonerror(boolean failOnError) {
        this.failOnError = failOnError;
    }

    /**
     * The target to call on the different sub-builds. Set to "" to execute
     * the default target.
     * @param target the target
     * <p>
     */
    //     REVISIT: Defaults to the target name that contains this task if not specified.
    public void setTarget(String target) {
        this.subTarget = target;
    }

    /**
     * Add a target to this Ant invocation.
     * @param t the <code>TargetElement</code> to add.
     * @since Ant 1.7
     */
    public void addConfiguredTarget(TargetElement t) {
        String name = t.getName();
        if ("".equals(name)) {
            throw new BuildException("target name must not be empty");
        }
        targets.add(t);
    }

    /**
     * Enable/ disable verbose log messages showing when each sub-build path is entered/ exited.
     * The default value is "false".
     * @param on true to enable verbose mode, false otherwise (default).
     */
    public void setVerbose(boolean on) {
        this.verbose = on;
    }

    /**
     * Corresponds to <code>&lt;ant&gt;</code>'s
     * <code>output</code> attribute.
     *
     * @param  s the filename to write the output to.
     */
    public void setOutput(String s) {
        this.output = s;
    }

    /**
     * Corresponds to <code>&lt;ant&gt;</code>'s
     * <code>inheritall</code> attribute.
     *
     * @param  b the new value for this boolean flag.
     */
    public void setInheritall(boolean b) {
        this.inheritAll = b;
    }

    /**
     * Corresponds to <code>&lt;ant&gt;</code>'s
     * <code>inheritrefs</code> attribute.
     *
     * @param  b the new value for this boolean flag.
     */
    public void setInheritrefs(boolean b) {
        this.inheritRefs = b;
    }

    /**
     * Corresponds to <code>&lt;ant&gt;</code>'s
     * nested <code>&lt;property&gt;</code> element.
     *
     * @param  p the property to pass on explicitly to the sub-build.
     */
    public void addProperty(Property p) {
        properties.addElement(p);
    }

    /**
     * Corresponds to <code>&lt;ant&gt;</code>'s
     * nested <code>&lt;reference&gt;</code> element.
     *
     * @param  r the reference to pass on explicitly to the sub-build.
     */
    public void addReference(Ant.Reference r) {
        references.addElement(r);
    }

    /**
     * Corresponds to <code>&lt;ant&gt;</code>'s
     * nested <code>&lt;propertyset&gt;</code> element.
     * @param ps the propertset
     */
    public void addPropertyset(PropertySet ps) {
        propertySets.addElement(ps);
    }

    /**
     * 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) {
        add(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) {
        add(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) {
        add(list);
    }

    /**
     * Adds a resource collection to the implicit build path.
     *
     * @param  rc the resource collection to add.
     * @since Ant 1.7
     */
    public void add(ResourceCollection rc) {
        getBuildpath().add(rc);
    }

    /**
     * Set the buildpath to be used to find sub-projects.
     *
     * @param  s an Ant Path object containing the buildpath.
     */
    public void setBuildpath(Path s) {
        getBuildpath().append(s);
    }

    /**
     * Creates a nested build path, and add it to the implicit build path.
     *
     * @return the newly created nested build path.
     */
    public Path createBuildpath() {
        return getBuildpath().createPath();
    }

    /**
     * Creates a nested <code>&lt;buildpathelement&gt;</code>,
     * and add it to the implicit build path.
     *
     * @return the newly created nested build path element.
     */
    public Path.PathElement createBuildpathElement() {
        return getBuildpath().createPathElement();
    }

    /**
     * Gets the implicit build path, creating it if <code>null</code>.
     *
     * @return the implicit build path.
     */
    private Path getBuildpath() {
        if (buildpath == null) {
            buildpath = new Path(getProject());
        }
        return buildpath;
    }

    /**
     * Buildpath to use, by reference.
     *
     * @param  r a reference to an Ant Path object containing the buildpath.
     */
    public void setBuildpathRef(Reference r) {
        createBuildpath().setRefid(r);
    }

    /**
     * Creates the &lt;ant&gt; task configured to run a specific target.
     *
     * @param directory : if not null the directory where the build should run
     *
     * @return the ant task, configured with the explicit properties and
     *         references necessary to run the sub-build.
     */
    private Ant createAntTask(File directory) {
        Ant antTask = new Ant(this);
        antTask.init();
        if (subTarget != null && subTarget.length() > 0) {
            antTask.setTarget(subTarget);
        }


        if (output != null) {
            antTask.setOutput(output);
        }

        if (directory != null) {
            antTask.setDir(directory);
        }

        antTask.setInheritAll(inheritAll);
        for (Enumeration i = properties.elements(); i.hasMoreElements();) {
            copyProperty(antTask.createProperty(), (Property) i.nextElement());
        }

        for (Enumeration i = propertySets.elements(); i.hasMoreElements();) {
            antTask.addPropertyset((PropertySet) i.nextElement());
        }

        antTask.setInheritRefs(inheritRefs);
        for (Enumeration i = references.elements(); i.hasMoreElements();) {
            antTask.addReference((Ant.Reference) i.nextElement());
        }

        return antTask;
    }

    /**
     * Assigns an Ant property to another.
     *
     * @param  to the destination property whose content is modified.
     * @param  from the source property whose content is copied.
     */
    private static void copyProperty(Property to, Property from) {
        to.setName(from.getName());

        if (from.getValue() != null) {
            to.setValue(from.getValue());
        }
        if (from.getFile() != null) {
            to.setFile(from.getFile());
        }
        if (from.getResource() != null) {
            to.setResource(from.getResource());
        }
        if (from.getPrefix() != null) {
            to.setPrefix(from.getPrefix());
        }
        if (from.getRefid() != null) {
            to.setRefid(from.getRefid());
        }
        if (from.getEnvironment() != null) {
            to.setEnvironment(from.getEnvironment());
        }
        if (from.getClasspath() != null) {
            to.setClasspath(from.getClasspath());
        }
    }

} // END class SubAnt