diff options
Diffstat (limited to 'src/main/java/com/c2kernel/utils/TransientCache.java')
| -rw-r--r-- | src/main/java/com/c2kernel/utils/TransientCache.java | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/src/main/java/com/c2kernel/utils/TransientCache.java b/src/main/java/com/c2kernel/utils/TransientCache.java deleted file mode 100644 index fc5f4de..0000000 --- a/src/main/java/com/c2kernel/utils/TransientCache.java +++ /dev/null @@ -1,149 +0,0 @@ -/**
- * This file is part of the CRISTAL-iSE kernel.
- * Copyright (c) 2001-2014 The CRISTAL Consortium. All rights reserved.
- *
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published
- * by the Free Software Foundation; either version 3 of the License, or (at
- * your option) any later version.
- *
- * This library is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- * License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- *
- * http://www.fsf.org/licensing/licenses/lgpl.html
- */
-package com.c2kernel.utils;
-import java.lang.ref.Reference;
-import java.util.AbstractMap;
-import java.util.AbstractSet;
-import java.util.Hashtable;
-import java.util.Iterator;
-import java.util.Map;
-import java.util.Set;
-/**************************************************************************
- * TransientCache - Uses transient references to allow unused entries to be
- * reaped by the java garbage collector.
- *
- * $Revision: 1.1 $
- * $Date: 2004/04/20 09:37:02 $
- *
- * Copyright (C) 2003 CERN - European Organization for Nuclear Research
- * All rights reserved.
- **************************************************************************/
-public abstract class TransientCache<K, V> extends AbstractMap<K, V> {
-
- private Map<K, Reference<V>> map = new Hashtable<K, Reference<V>>();
-
- @Override
- public synchronized Set<Entry<K, V>> entrySet() {
- Map<K, V> newMap = new Hashtable<K,V>();
- Iterator<Entry<K, Reference<V>>> iter = map.entrySet().iterator();
- while (iter.hasNext()) {
- Entry<K, Reference<V>> me = iter.next();
- Reference<V> ref = me.getValue();
- V o = ref.get();
- if (o == null) {
- // Delete cleared reference
- iter.remove();
- } else {
- // Copy out interior object
- newMap.put(me.getKey(), o);
- }
- }
- // Return set of interior objects
- return newMap.entrySet();
- }
-
- @Override
- public synchronized V put(K key, V value) {
- Reference<V> ref = makeReference(value);
- ref = map.put(key, ref);
- if (ref != null)
- return (ref.get());
- return null;
- }
-
- public abstract Reference<V> makeReference(Object value);
-
- @Override
- public V remove(Object key) {
- Iterator<Entry<K, Reference<V>>> i = map.entrySet().iterator();
- Entry<K, Reference<V>> correctEntry = null;
- if (key == null) {
- while (correctEntry == null && i.hasNext()) {
- Entry<K, Reference<V>> e = i.next();
- if (e.getKey() == null)
- correctEntry = e;
- }
- } else {
- while (correctEntry == null && i.hasNext()) {
- Entry<K, Reference<V>> e = i.next();
- if (key.equals(e.getKey()))
- correctEntry = e;
- }
- }
- V oldValue = null;
- if (correctEntry != null) {
- Reference<V> correctReference = correctEntry.getValue();
- oldValue = correctReference.get();
- i.remove();
- }
- return oldValue;
- }
- /**
- *
- */
- @Override
- public void clear() {
- map.entrySet().clear();
- }
-
- private transient Set<K> keySet = null;
-
- @Override
- public Set<K> keySet() {
- if (keySet == null) {
- keySet = new AbstractSet<K>() {
- @Override
- public Iterator<K> iterator() {
- return new Iterator<K>() {
- private Iterator<Entry<K, Reference<V>>> i = map.entrySet().iterator();
-
- @Override
- public boolean hasNext() {
- return i.hasNext();
- }
-
- @Override
- public K next() {
- return i.next().getKey();
- }
-
- @Override
- public void remove() {
- i.remove();
- }
- };
- }
-
- @Override
- public int size() {
- return TransientCache.this.size();
- }
-
- @Override
- public boolean contains(Object k) {
- return TransientCache.this.containsKey(k);
- }
- };
- }
- return keySet;
- }
-
-}
|