Defer sanity checks of dir attribute to the point where the fileset

will be used for the first time. This will enable things like

<project default="main">
  <fileset dir="tmp" id="tmpfiles">

  <target name="prep">
    <mkdir dir="tmp" />
  </target>

  <target name="main" depends="prep">
    <copy todir="foo">
      <fileset refid="tmpfiles" />
    </copy>
  </target>
</project>


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268830 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -29,6 +29,10 @@ Fixed bugs:
 * <delete includeemptydirs="true"> now deletes more than just the leaf
   directories.
 
+* You can now specify a <fileset> for a directory that doesn't exist at
+  declaration time but will created before the fileset gets used for the
+  first time.
+
 Changes from Ant 1.2 to Ant 1.3
 ===========================================
 

src/main/org/apache/tools/ant/types/FileSet.java

@@ -116,12 +116,6 @@ public class FileSet extends DataType {
             throw tooManyAttributes();
         }
 
-        if (!dir.exists()) {
-            throw new BuildException(dir.getAbsolutePath()+" not found.");
-        }
-        if (!dir.isDirectory()) {
-            throw new BuildException(dir.getAbsolutePath()+" is not a directory.");
-        }
         this.dir = dir;
     }
 
@@ -242,6 +236,13 @@ public class FileSet extends DataType {
             throw new BuildException("No directory specified for fileset.");
         }
 
+        if (!dir.exists()) {
+            throw new BuildException(dir.getAbsolutePath()+" not found.");
+        }
+        if (!dir.isDirectory()) {
+            throw new BuildException(dir.getAbsolutePath()+" is not a directory.");
+        }
+
         DirectoryScanner ds = new DirectoryScanner();
         setupDirectoryScanner(ds, p);
         ds.scan();