add PdhValidatePath wrapper

bindings/java/src/jni/win32/pdh.c

@@ -70,6 +70,21 @@ static char *get_error_message(PDH_STATUS status) {
     }
 }
 
+JNIEXPORT jlong SIGAR_JNI(win32_Pdh_validate)
+(JNIEnv *env, jclass cur, jstring jpath)
+{
+    PDH_STATUS status;
+    jboolean is_copy;
+    LPCTSTR path = JENV->GetStringChars(env, jpath, &is_copy);
+
+    status = PdhValidatePath(path);
+    if (is_copy) {
+        JENV->ReleaseStringChars(env, jpath, path);
+    }
+
+    return status;
+}
+
 JNIEXPORT void SIGAR_JNI(win32_Pdh_pdhConnectMachine)
 (JNIEnv *env, jobject cur, jstring jhost)
 {

bindings/java/src/org/hyperic/sigar/win32/Pdh.java

@@ -243,6 +243,8 @@ public class Pdh extends Win32 {
         return pdhGetObjects();
     }
 
+    public static final native long validate(String path);
+
     private static final native void pdhConnectMachine(String host)
         throws Win32Exception;
     private static final native long pdhOpenQuery() throws Win32Exception;

bindings/java/src/org/hyperic/sigar/win32/test/TestPdh.java

@@ -58,19 +58,12 @@ public class TestPdh extends SigarTestCase {
             if (!trans.equals(path)) {
                 traceln(path + "-->" + trans);
             }
-
+            traceln(path + " validate: " + Pdh.validate(path));
             getValue(path);
         }
-        /* XXX hangs for a while on my XP box
+
         String bogusKey = "\\Does Not\\Exist";
-        try {
-            new Pdh().getRawValue(bogusKey);
-            assertTrue(false);
-        } catch (Win32Exception e) {
-            assertTrue(true);
-            traceln(bogusKey + "=" + e.getMessage());
-        }
-        */
+        assertTrue(Pdh.validate(bogusKey) != 0);
     }
 
     public void testCounterMap() throws Exception {