/*
* NOTE: This copyright does *not* cover user programs that use HQ
* program services by normal system calls through the application
* program interfaces provided as part of the Hyperic Plug-in Development
* Kit or the Hyperic Client Development Kit - this is merely considered
* normal use of the program, and does *not* fall under the heading of
* "derived work".
*
* Copyright (C) [2004, 2005, 2006], Hyperic, Inc.
* This file is part of HQ.
*
* HQ is free software; you can redistribute it and/or modify
* it under the terms version 2 of the GNU General Public License as
* published by the Free Software Foundation. This program is distributed
* in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*/
package org.hyperic.hq.plugin.system;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hyperic.sigar.OperatingSystem;
public class OperatingSystemReflection {
protected static Log log = LogFactory.getLog("OperatingSystemReflection");
private static final String CLASS_NAME = "org.hyperic.hq.product.HypericOperatingSystem";
private static Class<?> getHypericOperatingSystemClass()
{
try {
Class<?> hypericOperatingSystemClass = Class.forName (CLASS_NAME);
log.debug(CLASS_NAME + " found!");
return hypericOperatingSystemClass;
}
catch (ClassNotFoundException exception) {
log.debug(CLASS_NAME + " not found!");
return null;
}
}
private static Object getStaticFieldValue(String fieldName) {
Field f1;
try {
Class<?> hypericOperatingSystemClass = getHypericOperatingSystemClass();
if (hypericOperatingSystemClass == null) {
return null;
}
f1 = hypericOperatingSystemClass.getDeclaredField(fieldName);
Object o = f1.get(null);
return o;
}catch(Exception e) {
log.error("failed to get field=" + fieldName, e);
return null;
}
}
private static Object invokeStaticMethodWithParam(String methodName, String param) {
try {
Class<?> hypericOperatingSystemClass = getHypericOperatingSystemClass();
if (hypericOperatingSystemClass == null) {
return null;
}
Method method = hypericOperatingSystemClass.getMethod(methodName, String.class);
Object o = method.invoke(null, param);
return o;
} catch (Exception e) {
log.error("invokeStaticMethodWithParam failed =" + methodName + " param=" + param, e);
return null;
}
}
private static Object invokeStaticMethod(String methodName, Class<?> hypericOperatingSystemClass) {
try {
Method method = hypericOperatingSystemClass.getMethod(methodName);
Object o = method.invoke(null);
return o;
} catch (Exception e) {
log.error("invokeStaticMethod failed =" + methodName, e);
return null;
}
}
private static Object getInstance(Class<?> hypericOperatingSystemClass) {
return invokeStaticMethod("getInstance", hypericOperatingSystemClass);
}
private static Object invokeObjectMethod(String methodName) {
Class<?> hypericOperatingSystemClass = getHypericOperatingSystemClass();
if (hypericOperatingSystemClass == null) {
return null;
}
Object o = getInstance(hypericOperatingSystemClass);
if (o == null) {
return null;
}
// now invoke non static methos
try {
Method method = hypericOperatingSystemClass.getMethod(methodName);
Object res = method.invoke(o);
return res;
}
catch(Exception e) {
log.error("failed to invoke method=" + methodName);
return null;
}
}
public static String getName() {
String name = (String)invokeObjectMethod("getName");
if (name == null) {
return OperatingSystem.getInstance().getName();
}
return name;
}
public static String getDescription() {
String res = (String)invokeObjectMethod("getDescription");
if (res == null) {
res = OperatingSystem.getInstance().getDescription();
}
return res;
}
public static String getArch() {
String res = (String)invokeObjectMethod("getArch");
if (res == null) {
res = OperatingSystem.getInstance().getArch();
}
return res;
}
public static String getVersion() {
String res = (String)invokeObjectMethod("getVersion");
if (res == null) {
res = OperatingSystem.getInstance().getVersion();
}
return res;
}
public static String getVendor() {
String res = (String)invokeObjectMethod("getVendor");
if (res == null) {
res = OperatingSystem.getInstance().getVendor();
}
return res;
}
public static String getVendorVersion() {
String res = (String)invokeObjectMethod("getVendorVersion");
if (res == null) {
res = OperatingSystem.getInstance().getVendorVersion();
}
return res;
}
public static boolean isWin32(String osName) {
Object res = invokeStaticMethodWithParam("isWin32", osName);
if (res == null) {
return OperatingSystem.isWin32(osName);
}
return (Boolean)res;
}
public static boolean IS_WIN32() {
Object o = getStaticFieldValue("IS_WIN32");
if ( o == null) {
return OperatingSystem.IS_WIN32;
}
return (Boolean)o;
}
public static boolean IS_HYPER_V() {
Object o = getStaticFieldValue("IS_HYPER_V");
if ( o == null) {
return false;
}
return (Boolean)o;
}
}