| /* |
| * 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.utils.memory; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.cassandra.db.BufferDecoratedKey; |
| import org.apache.cassandra.db.Clustering; |
| import org.apache.cassandra.db.DecoratedKey; |
| import org.apache.cassandra.db.marshal.ByteArrayAccessor; |
| import org.apache.cassandra.db.marshal.ByteBufferAccessor; |
| import org.apache.cassandra.db.marshal.ValueAccessor; |
| import org.apache.cassandra.db.rows.Cell; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| |
| /** |
| * Cloner class that can be use to clone partition elements using on-heap or off-heap buffers. |
| * |
| */ |
| public abstract class ByteBufferCloner implements Cloner |
| { |
| /** |
| * Allocate a slice of the given length. |
| */ |
| public abstract ByteBuffer allocate(int size); |
| |
| @Override |
| public DecoratedKey clone(DecoratedKey key) |
| { |
| return new BufferDecoratedKey(key.getToken(), clone(key.getKey())); |
| } |
| |
| @Override |
| public Clustering<?> clone(Clustering<?> clustering) |
| { |
| return clustering.clone(this); |
| } |
| |
| @Override |
| public Cell<?> clone(Cell<?> cell) |
| { |
| return cell.clone(this); |
| } |
| |
| public final ByteBuffer clone(ByteBuffer buffer) |
| { |
| return clone(buffer, ByteBufferAccessor.instance); |
| } |
| |
| public final ByteBuffer clone(byte[] bytes) |
| { |
| return clone(bytes, ByteArrayAccessor.instance); |
| } |
| |
| public final <V> ByteBuffer clone(V value, ValueAccessor<V> accessor) |
| { |
| assert value != null; |
| int size = accessor.size(value); |
| if (size == 0) |
| return ByteBufferUtil.EMPTY_BYTE_BUFFER; |
| ByteBuffer cloned = allocate(size); |
| |
| cloned.mark(); |
| accessor.write(value, cloned); |
| cloned.reset(); |
| return cloned; |
| } |
| } |