| /* |
| * 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.db.composites; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.utils.memory.AbstractAllocator; |
| import org.apache.cassandra.utils.ObjectSizes; |
| |
| /** |
| * Wraps another Composite and adds an EOC byte to track whether this is a slice start or end. |
| */ |
| public class BoundedComposite extends AbstractComposite |
| { |
| private static final long EMPTY_SIZE = ObjectSizes.measure(new BoundedComposite(null, false)); |
| |
| private final Composite wrapped; |
| private final boolean isStart; |
| |
| private BoundedComposite(Composite wrapped, boolean isStart) |
| { |
| this.wrapped = wrapped; |
| this.isStart = isStart; |
| } |
| |
| static Composite startOf(Composite c) |
| { |
| return new BoundedComposite(c, true); |
| } |
| |
| static Composite endOf(Composite c) |
| { |
| return new BoundedComposite(c, false); |
| } |
| |
| public int size() |
| { |
| return wrapped.size(); |
| } |
| |
| public boolean isStatic() |
| { |
| return wrapped.isStatic(); |
| } |
| |
| public ByteBuffer get(int i) |
| { |
| return wrapped.get(i); |
| } |
| |
| @Override |
| public EOC eoc() |
| { |
| return isStart ? EOC.START : EOC.END; |
| } |
| |
| @Override |
| public Composite withEOC(EOC eoc) |
| { |
| switch (eoc) |
| { |
| case START: |
| return isStart ? this : startOf(wrapped); |
| case END: |
| return isStart ? endOf(wrapped) : this; |
| default: |
| return wrapped; |
| } |
| } |
| |
| @Override |
| public ByteBuffer toByteBuffer() |
| { |
| ByteBuffer bb = wrapped.toByteBuffer(); |
| bb.put(bb.remaining() - 1, (byte)(isStart ? -1 : 1)); |
| return bb; |
| } |
| |
| public long unsharedHeapSize() |
| { |
| return EMPTY_SIZE + wrapped.unsharedHeapSize(); |
| } |
| |
| public Composite copy(CFMetaData cfm, AbstractAllocator allocator) |
| { |
| return new BoundedComposite(wrapped.copy(cfm, allocator), isStart); |
| } |
| } |