refactor trimmers to their own files

apps/i2psnark/java/src/net/i2p/kademlia/KBucketSet.java

@@ -768,70 +768,6 @@ public class KBucketSet<T extends SimpleDataStructure> {
         }
     }
 
-    /**
-     *  Called when a kbucket can no longer be split and is too big
-     */
-    public interface KBucketTrimmer<K extends SimpleDataStructure> {
-        /**
-         *  Called from add() just before adding the entry.
-         *  You may call getEntries() and/or remove() from here.
-         *  Do NOT call add().
-         *  To always discard a newer entry, always return false.
-         *
-         *  @param kbucket the kbucket that is now too big
-         *  @return true to actually add the entry.
-         */
-        public boolean trim(KBucket<K> kbucket, K toAdd);
-    }
-
-    /**
-     *  Removes a random element. Not resistant to flooding.
-     */
-    public static class RandomTrimmer<T extends SimpleDataStructure> implements KBucketTrimmer<T> {
-        protected final I2PAppContext _ctx;
-        private final int _max;
-
-        public RandomTrimmer(I2PAppContext ctx, int max) {
-            _ctx = ctx;
-            _max = max;
-        }
-
-        public boolean trim(KBucket<T> kbucket, T toAdd) {
-            List<T> e = new ArrayList(kbucket.getEntries());
-            int sz = e.size();
-            // concurrency
-            if (sz < _max)
-                return true;
-            T toRemove = e.get(_ctx.random().nextInt(sz));
-            return kbucket.remove(toRemove);
-        }
-    }
-
-    /**
-     *  Removes a random element, but only if the bucket hasn't changed in 5 minutes.
-     */
-    public static class RandomIfOldTrimmer<T extends SimpleDataStructure> extends RandomTrimmer<T> {
-
-        public RandomIfOldTrimmer(I2PAppContext ctx, int max) {
-            super(ctx, max);
-        }
-
-        public boolean trim(KBucket<T> kbucket, T toAdd) {
-            if (kbucket.getLastChanged() > _ctx.clock().now() - 5*60*1000)
-                return false;
-            return super.trim(kbucket, toAdd);
-        }
-    }
-
-    /**
-     *  Removes nothing and always rejects the add. Flood resistant..
-     */
-    public static class RejectTrimmer<T extends SimpleDataStructure> implements KBucketTrimmer<T> {
-        public boolean trim(KBucket<T> kbucket, T toAdd) {
-            return false;
-        }
-    }
-
     @Override
     public String toString() {
         StringBuilder buf = new StringBuilder(1024);