added the ability to specify the jive id type as an annotation of a class

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@1389 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/database/JiveID.java

+package org.jivesoftware.database;
+
+/**
+ * Used to specify what jive id an object should have
+ *
+ * @author Andrew Wright
+ */
+public @interface JiveID {
+    
+    /**
+     * should return the int type for this object
+     */
+    int value();
+}

src/java/org/jivesoftware/database/SequenceManager.java

@@ -84,6 +84,34 @@ public class SequenceManager {
         }
     }
 
+    /**
+     * Method for objects that have defined the annotation {@link JiveID} in their class.
+     *
+     * The annotation JiveID should contain the id type for the object (the same number you would
+     * use to call nextID(int type))
+     *
+     * Example class definition:
+     *
+     * <code>
+     * \@JiveID(10)
+     * public class MyClass {
+     *
+     * }
+     * </code>
+     *
+     * @param o object that has annotation JiveID
+     * @return the next int
+     */
+    public static long nextID(Object o) {
+        JiveID id = o.getClass().getAnnotation(JiveID.class);
+
+        if(id == null) {
+            throw new IllegalArgumentException("Annotation JiveID must be defined in the class");
+        }
+
+        return nextID(id.value());
+    }
+
     /**
      * Used to set the blocksize of a given SequenceManager. If no SequenceManager has been registered
      * for the type we will verify the type is valid and then create a new sequence manager for it.