add getLocation method

bindings/java/src/net/hyperic/sigar/SigarLoader.java

@@ -1,11 +1,14 @@
 package net.hyperic.sigar;
 
 import net.hyperic.jni.ArchLoader;
+import net.hyperic.jni.ArchLoaderException;
 import net.hyperic.jni.ArchName;
 import net.hyperic.jni.ArchNotSupportedException;
 
 public class SigarLoader extends ArchLoader {
 
+    private static String location = null;
+
     public SigarLoader(Class loaderClass) {
         super(loaderClass);
     }
@@ -34,4 +37,19 @@ public class SigarLoader extends ArchLoader {
     protected void systemLoad(String name) {
         System.load(name);
     }
+
+    /**
+     * Returns the path where sigar.jar is located.
+     */
+    public synchronized static String getLocation() {
+        if (location == null) {
+            SigarLoader loader = new SigarLoader(Sigar.class);
+            try {
+                location = loader.findJarPath("sigar.jar");
+            } catch (ArchLoaderException e) {
+                location = ".";
+            }
+        }
+        return location;
+    }
 }