org.apache.cassandra.db.ClusteringBoundOrBoundary Maven / Gradle / Ivy
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*
* 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
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.cassandra.db;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.io.util.DataInputPlus;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.utils.memory.AbstractAllocator;
/**
* This class defines a threshold between ranges of clusterings. It can either be a start or end bound of a range, or
* the boundary between two different defined ranges.
*
* The latter is used for range tombstones for 2 main reasons:
* 1) When merging multiple iterators having range tombstones (that are represented by their start and end markers),
* we need to know when a range is close on an iterator, if it is reopened right away. Otherwise, we cannot
* easily produce the markers on the merged iterators within risking to fail the sorting guarantees of an
* iterator. See this comment for more details: https://goo.gl/yyB5mR.
* 2) This saves some storage space.
*/
public abstract class ClusteringBoundOrBoundary extends AbstractBufferClusteringPrefix
{
public static final ClusteringBoundOrBoundary.Serializer serializer = new Serializer();
protected ClusteringBoundOrBoundary(Kind kind, ByteBuffer[] values)
{
super(kind, values);
assert values.length > 0 || !kind.isBoundary();
}
public static ClusteringBoundOrBoundary create(Kind kind, ByteBuffer[] values)
{
return kind.isBoundary()
? new ClusteringBoundary(kind, values)
: new ClusteringBound(kind, values);
}
public boolean isBoundary()
{
return kind.isBoundary();
}
public boolean isOpen(boolean reversed)
{
return kind.isOpen(reversed);
}
public boolean isClose(boolean reversed)
{
return kind.isClose(reversed);
}
public static ClusteringBound inclusiveOpen(boolean reversed, ByteBuffer[] boundValues)
{
return new ClusteringBound(reversed ? Kind.INCL_END_BOUND : Kind.INCL_START_BOUND, boundValues);
}
public static ClusteringBound exclusiveOpen(boolean reversed, ByteBuffer[] boundValues)
{
return new ClusteringBound(reversed ? Kind.EXCL_END_BOUND : Kind.EXCL_START_BOUND, boundValues);
}
public static ClusteringBound inclusiveClose(boolean reversed, ByteBuffer[] boundValues)
{
return new ClusteringBound(reversed ? Kind.INCL_START_BOUND : Kind.INCL_END_BOUND, boundValues);
}
public static ClusteringBound exclusiveClose(boolean reversed, ByteBuffer[] boundValues)
{
return new ClusteringBound(reversed ? Kind.EXCL_START_BOUND : Kind.EXCL_END_BOUND, boundValues);
}
public static ClusteringBoundary inclusiveCloseExclusiveOpen(boolean reversed, ByteBuffer[] boundValues)
{
return new ClusteringBoundary(reversed ? Kind.EXCL_END_INCL_START_BOUNDARY : Kind.INCL_END_EXCL_START_BOUNDARY, boundValues);
}
public static ClusteringBoundary exclusiveCloseInclusiveOpen(boolean reversed, ByteBuffer[] boundValues)
{
return new ClusteringBoundary(reversed ? Kind.INCL_END_EXCL_START_BOUNDARY : Kind.EXCL_END_INCL_START_BOUNDARY, boundValues);
}
public ClusteringBoundOrBoundary copy(AbstractAllocator allocator)
{
ByteBuffer[] newValues = new ByteBuffer[size()];
for (int i = 0; i < size(); i++)
newValues[i] = allocator.clone(get(i));
return create(kind(), newValues);
}
public String toString(CFMetaData metadata)
{
return toString(metadata.comparator);
}
public String toString(ClusteringComparator comparator)
{
StringBuilder sb = new StringBuilder();
sb.append(kind()).append('(');
for (int i = 0; i < size(); i++)
{
if (i > 0)
sb.append(", ");
sb.append(comparator.subtype(i).getString(get(i)));
}
return sb.append(')').toString();
}
/**
* Returns the inverse of the current bound.
*
* This invert both start into end (and vice-versa) and inclusive into exclusive (and vice-versa).
*
* @return the invert of this bound. For instance, if this bound is an exlusive start, this return
* an inclusive end with the same values.
*/
public abstract ClusteringBoundOrBoundary invert();
public static class Serializer
{
public void serialize(ClusteringBoundOrBoundary bound, DataOutputPlus out, int version, List> types) throws IOException
{
out.writeByte(bound.kind().ordinal());
out.writeShort(bound.size());
ClusteringPrefix.serializer.serializeValuesWithoutSize(bound, out, version, types);
}
public long serializedSize(ClusteringBoundOrBoundary bound, int version, List> types)
{
return 1 // kind ordinal
+ TypeSizes.sizeof((short)bound.size())
+ ClusteringPrefix.serializer.valuesWithoutSizeSerializedSize(bound, version, types);
}
public ClusteringBoundOrBoundary deserialize(DataInputPlus in, int version, List> types) throws IOException
{
Kind kind = Kind.values()[in.readByte()];
return deserializeValues(in, kind, version, types);
}
public void skipValues(DataInputPlus in, Kind kind, int version, List> types) throws IOException
{
int size = in.readUnsignedShort();
if (size == 0)
return;
ClusteringPrefix.serializer.skipValuesWithoutSize(in, size, version, types);
}
public ClusteringBoundOrBoundary deserializeValues(DataInputPlus in, Kind kind, int version, List> types) throws IOException
{
int size = in.readUnsignedShort();
if (size == 0)
return kind.isStart() ? ClusteringBound.BOTTOM : ClusteringBound.TOP;
ByteBuffer[] values = ClusteringPrefix.serializer.deserializeValuesWithoutSize(in, size, version, types);
return create(kind, values);
}
}
}