| /* |
| * 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.cassandra.io.sstable; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| import org.apache.cassandra.utils.AbstractIterator; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.db.DecoratedKey; |
| import org.apache.cassandra.db.RowIndexEntry; |
| import org.apache.cassandra.dht.IPartitioner; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.RandomAccessReader; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| import org.apache.cassandra.utils.CloseableIterator; |
| |
| public class KeyIterator extends AbstractIterator<DecoratedKey> implements CloseableIterator<DecoratedKey> |
| { |
| private final static class In |
| { |
| private final File path; |
| private RandomAccessReader in; |
| |
| public In(File path) |
| { |
| this.path = path; |
| } |
| |
| private void maybeInit() |
| { |
| if (in == null) |
| in = RandomAccessReader.open(path); |
| } |
| |
| public DataInputPlus get() |
| { |
| maybeInit(); |
| return in; |
| } |
| |
| public boolean isEOF() |
| { |
| maybeInit(); |
| return in.isEOF(); |
| } |
| |
| public void close() |
| { |
| if (in != null) |
| in.close(); |
| } |
| |
| public long getFilePointer() |
| { |
| maybeInit(); |
| return in.getFilePointer(); |
| } |
| |
| public long length() |
| { |
| maybeInit(); |
| return in.length(); |
| } |
| } |
| |
| private final Descriptor desc; |
| private final In in; |
| private final IPartitioner partitioner; |
| |
| |
| public KeyIterator(Descriptor desc, CFMetaData metadata) |
| { |
| this.desc = desc; |
| in = new In(new File(desc.filenameFor(Component.PRIMARY_INDEX))); |
| partitioner = metadata.partitioner; |
| } |
| |
| protected DecoratedKey computeNext() |
| { |
| try |
| { |
| if (in.isEOF()) |
| return endOfData(); |
| |
| DecoratedKey key = partitioner.decorateKey(ByteBufferUtil.readWithShortLength(in.get())); |
| RowIndexEntry.Serializer.skip(in.get(), desc.version); // skip remainder of the entry |
| return key; |
| } |
| catch (IOException e) |
| { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public void close() |
| { |
| in.close(); |
| } |
| |
| public long getBytesRead() |
| { |
| return in.getFilePointer(); |
| } |
| |
| public long getTotalBytes() |
| { |
| return in.length(); |
| } |
| } |