1 /**
2 * Copyright The Apache Software Foundation
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 */
20 package org.apache.hadoop.hbase.io.hfile;
21
22 import java.util.Iterator;
23
24 import org.apache.hadoop.hbase.classification.InterfaceAudience;
25
26 /**
27 * Iterator over an array of BlockCache CachedBlocks.
28 */
29 @InterfaceAudience.Private
30 class BlockCachesIterator implements Iterator<CachedBlock> {
31 int index = 0;
32 final BlockCache [] bcs;
33 Iterator<CachedBlock> current;
34
35 BlockCachesIterator(final BlockCache [] blockCaches) {
36 this.bcs = blockCaches;
37 this.current = this.bcs[this.index].iterator();
38 }
39
40 @Override
41 public boolean hasNext() {
42 if (current.hasNext()) return true;
43 this.index++;
44 if (this.index >= this.bcs.length) return false;
45 this.current = this.bcs[this.index].iterator();
46 return hasNext();
47 }
48
49 @Override
50 public CachedBlock next() {
51 return this.current.next();
52 }
53
54 @Override
55 public void remove() {
56 throw new UnsupportedOperationException();
57 }
58 }