detect Apache Harmony

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1033587 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/Diagnostics.java

@@ -399,6 +399,8 @@ public final class Diagnostics {
         out.println(MagicNames.ANT_VERSION + ": " + p.getProperty(MagicNames.ANT_VERSION));
         out.println(MagicNames.ANT_JAVA_VERSION + ": "
                 + p.getProperty(MagicNames.ANT_JAVA_VERSION));
+        out.println("Is this the Apache Harmony VM? "
+                    + (JavaEnvUtils.isApacheHarmony() ? "yes" : "no"));
         out.println("Is this the Kaffe VM? "
                     + (JavaEnvUtils.isKaffe() ? "yes" : "no"));
         out.println("Is this gij/gcj? "

src/main/org/apache/tools/ant/util/JavaEnvUtils.java

@@ -94,6 +94,9 @@ public final class JavaEnvUtils {
     /** Whether this is the GNU VM (gcj/gij) */
     private static boolean gijDetected;
 
+    /** Whether this is Apache Harmony */
+    private static boolean harmonyDetected;
+
     /** array of packages in the runtime */
     private static Vector jrePackages;
 
@@ -147,6 +150,13 @@ public final class JavaEnvUtils {
         } catch (Throwable t) {
             // swallow as this simply doesn't seem to be gcj/gij
         }
+        harmonyDetected = false;
+        try {
+            Class.forName("org.apache.harmony.luni.util.Base64");
+            harmonyDetected = true;
+        } catch (Throwable t) {
+            // swallow as this simply doesn't seem to be Apache Harmony
+        }
     }
 
     /**
@@ -217,6 +227,15 @@ public final class JavaEnvUtils {
         return gijDetected;
     }
 
+    /**
+     * Checks whether the current VM is Apache Harmony.
+     * @since Ant 1.8.2
+     * @return true if the current VM is Apache Harmony.
+     */
+    public static boolean isApacheHarmony() {
+        return harmonyDetected;
+    }
+
     /**
      * Finds an executable that is part of a JRE installation based on
      * the java.home system property.