| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.ignite.internal.processors.cache; |
| |
| import java.util.Iterator; |
| import javax.cache.Cache; |
| import org.apache.ignite.internal.util.GridSerializableIterator; |
| import org.apache.ignite.internal.util.typedef.F; |
| import org.apache.ignite.lang.IgniteClosure; |
| import org.apache.ignite.lang.IgnitePredicate; |
| |
| /** |
| * Cache-backed iterator. |
| */ |
| public class GridCacheIterator<K, V, T> implements GridSerializableIterator<T> { |
| /** */ |
| private static final long serialVersionUID = 0L; |
| |
| /** Base iterator. */ |
| private final Iterator<? extends Cache.Entry<K, V>> it; |
| |
| /** Transformer. */ |
| private final IgniteClosure<Cache.Entry<K, V>, T> trans; |
| |
| /** Current element. */ |
| private Cache.Entry<K, V> cur; |
| |
| /** Context. */ |
| private GridCacheContext<K, V> cctx; |
| |
| /** |
| * @param cctx Context. |
| * @param c Cache entry collection. |
| * @param trans Transformer. |
| * @param filter Filter. |
| */ |
| public GridCacheIterator( |
| GridCacheContext<K, V> cctx, |
| Iterable<? extends Cache.Entry<K, V>> c, |
| IgniteClosure<Cache.Entry<K, V>, T> trans, |
| IgnitePredicate<Cache.Entry<K, V>>[] filter |
| ) { |
| this.cctx = cctx; |
| |
| it = F.iterator0(c, false, filter); |
| |
| this.trans = trans; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public boolean hasNext() { |
| if (!it.hasNext()) { |
| cur = null; |
| |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public T next() { |
| return trans.apply(cur = it.next()); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void remove() { |
| it.remove(); |
| |
| cctx.grid().cache(cctx.name()).remove(cur.getKey(), cur.getValue()); |
| } |
| } |