(SIGAR-207) Add Pdh.getCounterType method

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

@@ -254,6 +254,23 @@ JNIEXPORT jstring SIGAR_JNI(win32_Pdh_pdhGetDescription)
     return retval;
 }
 
+JNIEXPORT jlong SIGAR_JNI(win32_Pdh_pdhGetCounterType)
+(JNIEnv *env, jclass cur, jlong counter)
+{
+    HCOUNTER h_counter = (HCOUNTER)counter;
+    PDH_COUNTER_INFO info;
+    DWORD size = sizeof(info);
+    PDH_STATUS status;
+
+    status = PdhGetCounterInfo(h_counter, FALSE, &size, &info);
+    if (status != ERROR_SUCCESS) {
+        win32_throw_exception(env, get_error_message(status));
+        return -1;
+    }
+
+    return info.dwType;
+}
+
 JNIEXPORT jobjectArray SIGAR_JNI(win32_Pdh_pdhGetInstances)
 (JNIEnv *env, jclass cur, jstring cp)
 {

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

@@ -63,6 +63,15 @@ public class Pdh extends Win32 {
     public static final String PERFLIB_KEY =
         "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib";
 
+    //see winperf.h
+    public static final long PERF_TYPE_NUMBER  = 0x00000000; // a number (not a counter)
+
+    public static final long PERF_TYPE_COUNTER = 0x00000400; // an increasing numeric value
+
+    public static final long PERF_TYPE_TEXT    = 0x00000800; // a text field
+
+    public static final long PERF_TYPE_ZERO    = 0x00000C00; // displays a zero
+
     private long   query = -1l; // Handle to the query
     private String hostname = null;
     private static Map counters = null;
@@ -303,6 +312,16 @@ public class Pdh extends Win32 {
         }
     }
 
+    public long getCounterType(String path) throws Win32Exception {
+        long counter =
+            pdhAddCounter(this.query, translate(path));
+        try {
+            return pdhGetCounterType(counter);
+        } finally {
+            pdhRemoveCounter(counter);
+        }
+    }
+
     public static String[] getInstances(String path) throws Win32Exception {
         return pdhGetInstances(getCounterName(path));
     }
@@ -332,6 +351,8 @@ public class Pdh extends Win32 {
         throws Win32Exception;
     private static final native String pdhGetDescription(long counter)
         throws Win32Exception;
+    private static final native long pdhGetCounterType(long counter)
+        throws Win32Exception;
     private static final native String[] pdhGetInstances(String path)
         throws Win32Exception;
     private static final native String[] pdhGetKeys(String path)

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

@@ -30,10 +30,15 @@ public class TestPdh extends SigarTestCase {
         super(name);
     }
 
+    private static boolean isCounter(long type) {
+        return (type & Pdh.PERF_TYPE_COUNTER) == Pdh.PERF_TYPE_COUNTER;
+    }
+
     private void getValue(String key) throws Exception {
         Pdh pdh = new Pdh();
 
         traceln(key + ": " + pdh.getDescription(key));
+        traceln("counter=" + isCounter(pdh.getCounterType(key)));
         assertGtEqZeroTrace("raw",
                             (long)pdh.getRawValue(key));
         assertGtEqZeroTrace("fmt",