add version attributes

bindings/java/src/org/hyperic/sigar/jmx/SigarRegistry.java

@@ -19,9 +19,13 @@
 package org.hyperic.sigar.jmx;
 
 import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map;
 
 import javax.management.Attribute;
 import javax.management.AttributeNotFoundException;
+import javax.management.MBeanAttributeInfo;
 import javax.management.MBeanConstructorInfo;
 import javax.management.MBeanException;
 import javax.management.MBeanInfo;
@@ -33,6 +37,7 @@ import javax.management.ReflectionException;
 
 import org.hyperic.sigar.Sigar;
 import org.hyperic.sigar.SigarException;
+import org.hyperic.sigar.SigarLoader;
 
 /**
  * <p>Registry of all Sigar MBeans. Can be used as a convenient way to invoke 
@@ -63,6 +68,8 @@ public class SigarRegistry extends AbstractMBean {
 
     private static final String MBEAN_TYPE = "SigarRegistry";
 
+    private static final Map VERSION_ATTRS = new LinkedHashMap();
+
     private static final MBeanInfo MBEAN_INFO;
 
     private static final MBeanConstructorInfo MBEAN_CONSTR_DEFAULT;
@@ -87,7 +94,7 @@ public class SigarRegistry extends AbstractMBean {
                         + "and destruction of Sigar MBeans. Any Sigar MBean created via "
                         + "this instance will automatically be cleaned up when this "
                         + "instance is deregistered from the MBean server.",
-                null /*new MBeanAttributeInfo[0]*/,
+                getAttributeInfo(),
                 new MBeanConstructorInfo[] { MBEAN_CONSTR_DEFAULT },
                 null /*new MBeanOperationInfo[0] */, 
                 null /*new MBeanNotificationInfo[0]*/);
@@ -97,6 +104,33 @@ public class SigarRegistry extends AbstractMBean {
 
     private final ArrayList managedBeans;
 
+    private static MBeanAttributeInfo[] getAttributeInfo() {
+        VERSION_ATTRS.put("JarVersion", Sigar.VERSION_STRING);
+        VERSION_ATTRS.put("NativeVersion", Sigar.NATIVE_VERSION_STRING);
+        VERSION_ATTRS.put("JarBuildDate", Sigar.BUILD_DATE);
+        VERSION_ATTRS.put("NativeBuildDate", Sigar.NATIVE_BUILD_DATE);
+        VERSION_ATTRS.put("JarSourceRevision", Sigar.SCM_REVISION);
+        VERSION_ATTRS.put("NativeSourceRevision", Sigar.NATIVE_SCM_REVISION);
+        VERSION_ATTRS.put("NativeLibraryName", SigarLoader.getNativeLibraryName());
+
+        MBeanAttributeInfo[] attrs = new MBeanAttributeInfo[VERSION_ATTRS.size()];
+        int i=0;
+        for (Iterator it=VERSION_ATTRS.entrySet().iterator();
+             it.hasNext();)
+        {
+            Map.Entry entry = (Map.Entry)it.next();
+            String name = (String)entry.getKey();
+            attrs[i++] =
+                new MBeanAttributeInfo(name,
+                                       entry.getValue().getClass().getName(),
+                                       name,
+                                       true,   // isReadable
+                                       false,  // isWritable
+                                       false); // isIs
+        }
+        return attrs;
+    }
+
     /**
      * Creates a new instance of this class. Will create the Sigar instance this 
      * class uses when constructing other MBeans.
@@ -141,7 +175,11 @@ public class SigarRegistry extends AbstractMBean {
      * @see javax.management.DynamicMBean#getAttribute(java.lang.String)
      */
     public Object getAttribute(String attr) throws AttributeNotFoundException {
-        throw new AttributeNotFoundException(attr);
+        Object obj = VERSION_ATTRS.get(attr);
+        if (obj == null) {
+            throw new AttributeNotFoundException(attr);
+        }
+        return obj;
     }
 
     /* (non-Javadoc)