Changed the copy task to support a nested mapper.

This adds a lot of power to copy and move, we can drop the optional
RenameExt task for example as

<renamext srcdir="src" destdir="dest" fromextension=".java.keep"
          toextension=".java" replace="true" />

can now be written as

<move todir="dest" overwrite="true">
  <fileset dir="src" />
  <mapper type="glob" from="*.java.keep" to="*.java" />
</move>

but more difficult transformations can be done as well.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268203 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Copy.java

@@ -72,6 +72,7 @@ import java.util.*;
  * copyfile/copydir tasks.</p>
  *
  * @author Glenn McAllister <a href="mailto:glennm@ca.ibm.com">glennm@ca.ibm.com</a>
+ * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a>
  */
 public class Copy extends Task {
     protected File file = null;     // the source file 
@@ -88,6 +89,8 @@ public class Copy extends Task {
     protected Hashtable fileCopyMap = new Hashtable();
     protected Hashtable dirCopyMap = new Hashtable();
 
+    protected Mapper mapperElement = null;
+
     /**
      * Sets a single source file to copy.
      */
@@ -159,6 +162,18 @@ public class Copy extends Task {
         filesets.addElement(set);
     }
 
+    /**
+     * Defines the FileNameMapper to use (nested mapper element).
+     */
+    public Mapper createMapper() throws BuildException {
+        if (mapperElement != null) {
+            throw new BuildException("Cannot define more than one mapper",
+                                     location);
+        }
+        mapperElement = new Mapper(project);
+        return mapperElement;
+    }
+
     /**
      * Performs the copy operation.
      */
@@ -246,7 +261,9 @@ public class Copy extends Task {
      */
     protected void scan(File fromDir, File toDir, String[] files, String[] dirs) {
         FileNameMapper mapper = null;
-        if (flatten) {
+        if (mapperElement != null) {
+            mapper = mapperElement.getImplementation();
+        } else if (flatten) {
             mapper = new FlatFileNameMapper();
         } else {
             mapper = new IdentityMapper();