001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.io.hfile;
019
020import java.util.Iterator;
021import org.apache.yetus.audience.InterfaceAudience;
022
023/**
024 * Iterator over an array of BlockCache CachedBlocks.
025 */
026@InterfaceAudience.Private
027class BlockCachesIterator implements Iterator<CachedBlock> {
028  int index = 0;
029  final BlockCache[] bcs;
030  Iterator<CachedBlock> current;
031
032  BlockCachesIterator(final BlockCache[] blockCaches) {
033    this.bcs = blockCaches;
034    this.current = this.bcs[this.index].iterator();
035  }
036
037  @Override
038  public boolean hasNext() {
039    if (current.hasNext()) return true;
040    this.index++;
041    if (this.index >= this.bcs.length) return false;
042    this.current = this.bcs[this.index].iterator();
043    return hasNext();
044  }
045
046  @Override
047  public CachedBlock next() {
048    return this.current.next();
049  }
050
051  @Override
052  public void remove() {
053    throw new UnsupportedOperationException();
054  }
055}