/* * 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(); } }