support sources with extensions other than .java in javac. Submitted by Andrew Eisenberg. PR 48829.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1040170 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -281,6 +281,11 @@ Other changes:
    this release of Ant are detected as Java 1.5 and not 1.6.
    Bugzilla Report 50256.
 
+ * It is now possible to write a compiler adapter for <javac> that
+   compiles sources with extensions other than .java (but that still
+   compile to .class files).
+   Bugzilla Report 48829.
+
 Changes from Ant 1.8.0 TO Ant 1.8.1 
 ===================================
 

contributors.xml

@@ -70,6 +70,10 @@
     <first>Andreas</first>
     <last>Ames</last>
   </name>
+  <name>
+    <first>Andrew</first>
+    <last>Eisenberg</last>
+  </name>
   <name>
     <first>Andrew</first>
     <last>Everitt</last>

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

@@ -31,6 +31,7 @@ import org.apache.tools.ant.DirectoryScanner;
 import org.apache.tools.ant.MagicNames;
 import org.apache.tools.ant.Project;
 import org.apache.tools.ant.taskdefs.compilers.CompilerAdapter;
+import org.apache.tools.ant.taskdefs.compilers.CompilerAdapterExtension;
 import org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory;
 import org.apache.tools.ant.types.Path;
 import org.apache.tools.ant.types.Reference;
@@ -934,7 +935,10 @@ public class Javac extends MatchingTask {
      */
     protected void scanDir(File srcDir, File destDir, String[] files) {
         GlobPatternMapper m = new GlobPatternMapper();
-        m.setFrom("*.java");
+        String[] extensions = findSupportedFileExtensions();
+        
+        for (int i = 0; i < extensions.length; i++) {
+            m.setFrom(extensions[i]);
         m.setTo("*.class");
         SourceFileScanner sfs = new SourceFileScanner(this);
         File[] newFiles = sfs.restrictAsFiles(files, srcDir, destDir, m);
@@ -949,6 +953,33 @@ public class Javac extends MatchingTask {
                     compileList.length, newFiles.length);
             compileList = newCompileList;
         }
+        }
+    }
+
+    private String[] findSupportedFileExtensions() {
+        String compilerImpl = getCompiler();
+        CompilerAdapter adapter =
+            nestedAdapter != null ? nestedAdapter :
+            CompilerAdapterFactory.getCompiler(compilerImpl, this,
+                                               createCompilerClasspath());
+        String[] extensions = null;
+        if (adapter instanceof CompilerAdapterExtension) {
+            extensions =
+                ((CompilerAdapterExtension) adapter).getSupportedFileExtensions();
+        } 
+
+        if (extensions == null) {
+            extensions = new String[] { "java" };
+        }
+
+        // now process the extensions to ensure that they are the
+        // right format
+        for (int i = 0; i < extensions.length; i++) {
+            if (!extensions[i].startsWith("*.")) {
+                extensions[i] = "*." + extensions[i];
+            }
+        }
+        return extensions; 
     }
 
     /**

src/main/org/apache/tools/ant/taskdefs/compilers/DefaultCompilerAdapter.java

@@ -44,7 +44,9 @@ import org.apache.tools.ant.taskdefs.condition.Os;
  *
  * @since Ant 1.3
  */
-public abstract class DefaultCompilerAdapter implements CompilerAdapter {
+public abstract class DefaultCompilerAdapter
+    implements CompilerAdapter, CompilerAdapterExtension {
+
     private static final int COMMAND_LINE_LIMIT;
     static {
         if (Os.isFamily("os/2")) {
@@ -127,6 +129,15 @@ public abstract class DefaultCompilerAdapter implements CompilerAdapter {
         return attributes;
     }
 
+    /**
+     * By default, only recognize files with a Java extension,
+     * but specialized compilers can recognize multiple kinds
+     * of files.
+     */
+    public String[] getSupportedFileExtensions() {
+        return new String[] { "java" };
+    }
+
     /**
      * Get the project this compiler adapter was created in.
      * @return the owner project