105 lines
2.7 KiB
Java
105 lines
2.7 KiB
Java
/*
|
|
* 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);
|
|
}
|
|
}
|