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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cql3;
import java.nio.ByteBuffer;
import java.util.*;
import com.google.common.base.Joiner;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.db.ColumnFamily;
import org.apache.cassandra.db.composites.CellName;
import org.apache.cassandra.db.composites.Composite;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.db.marshal.MapType;
import org.apache.cassandra.db.marshal.SetType;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.serializers.CollectionSerializer;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.transport.Server;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
/**
* Static helper methods and classes for sets.
*/
public abstract class Sets
{
private Sets() {}
public static ColumnSpecification valueSpecOf(ColumnSpecification column)
{
return new ColumnSpecification(column.ksName, column.cfName, new ColumnIdentifier("value(" + column.name + ")", true), ((SetType)column.type).getElementsType());
}
public static class Literal implements Term.Raw
{
private final List elements;
public Literal(List elements)
{
this.elements = elements;
}
public Term prepare(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
{
validateAssignableTo(keyspace, receiver);
// We've parsed empty maps as a set literal to break the ambiguity so
// handle that case now
if (receiver.type instanceof MapType && elements.isEmpty())
return new Maps.Value(Collections.emptyMap());
ColumnSpecification valueSpec = Sets.valueSpecOf(receiver);
Set values = new HashSet(elements.size());
boolean allTerminal = true;
for (Term.Raw rt : elements)
{
Term t = rt.prepare(keyspace, valueSpec);
if (t.containsBindMarker())
throw new InvalidRequestException(String.format("Invalid set literal for %s: bind variables are not supported inside collection literals", receiver.name));
if (t instanceof Term.NonTerminal)
allTerminal = false;
values.add(t);
}
DelayedValue value = new DelayedValue(((SetType)receiver.type).getElementsType(), values);
return allTerminal ? value.bind(QueryOptions.DEFAULT) : value;
}
private void validateAssignableTo(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
{
if (!(receiver.type instanceof SetType))
{
// We've parsed empty maps as a set literal to break the ambiguity so
// handle that case now
if ((receiver.type instanceof MapType) && elements.isEmpty())
return;
throw new InvalidRequestException(String.format("Invalid set literal for %s of type %s", receiver.name, receiver.type.asCQL3Type()));
}
ColumnSpecification valueSpec = Sets.valueSpecOf(receiver);
for (Term.Raw rt : elements)
{
if (!rt.isAssignableTo(keyspace, valueSpec))
throw new InvalidRequestException(String.format("Invalid set literal for %s: value %s is not of type %s", receiver.name, rt, valueSpec.type.asCQL3Type()));
}
}
public boolean isAssignableTo(String keyspace, ColumnSpecification receiver)
{
try
{
validateAssignableTo(keyspace, receiver);
return true;
}
catch (InvalidRequestException e)
{
return false;
}
}
@Override
public String toString()
{
return "{" + Joiner.on(", ").join(elements) + "}";
}
}
public static class Value extends Term.Terminal implements Term.CollectionTerminal
{
public final SortedSet elements;
public Value(SortedSet elements)
{
this.elements = elements;
}
public static Value fromSerialized(ByteBuffer value, SetType type, int version) throws InvalidRequestException
{
try
{
// Collections have this small hack that validate cannot be called on a serialized object,
// but compose does the validation (so we're fine).
Set s = (Set)type.getSerializer().deserializeForNativeProtocol(value, version);
SortedSet elements = new TreeSet(type.getElementsType());
for (Object element : s)
elements.add(type.getElementsType().decompose(element));
return new Value(elements);
}
catch (MarshalException e)
{
throw new InvalidRequestException(e.getMessage());
}
}
public ByteBuffer get(QueryOptions options)
{
return getWithProtocolVersion(options.getProtocolVersion());
}
public ByteBuffer getWithProtocolVersion(int protocolVersion)
{
return CollectionSerializer.pack(new ArrayList<>(elements), elements.size(), protocolVersion);
}
public boolean equals(SetType st, Value v)
{
if (elements.size() != v.elements.size())
return false;
Iterator thisIter = elements.iterator();
Iterator thatIter = v.elements.iterator();
AbstractType elementsType = st.getElementsType();
while (thisIter.hasNext())
if (elementsType.compare(thisIter.next(), thatIter.next()) != 0)
return false;
return true;
}
}
// See Lists.DelayedValue
public static class DelayedValue extends Term.NonTerminal
{
private final Comparator comparator;
private final Set elements;
public DelayedValue(Comparator comparator, Set elements)
{
this.comparator = comparator;
this.elements = elements;
}
public boolean containsBindMarker()
{
// False since we don't support them in collection
return false;
}
public void collectMarkerSpecification(VariableSpecifications boundNames)
{
}
public Value bind(QueryOptions options) throws InvalidRequestException
{
SortedSet buffers = new TreeSet<>(comparator);
for (Term t : elements)
{
ByteBuffer bytes = t.bindAndGet(options);
if (bytes == null)
throw new InvalidRequestException("null is not supported inside collections");
// We don't support value > 64K because the serialization format encode the length as an unsigned short.
if (bytes.remaining() > FBUtilities.MAX_UNSIGNED_SHORT)
throw new InvalidRequestException(String.format("Set value is too long. Set values are limited to %d bytes but %d bytes value provided",
FBUtilities.MAX_UNSIGNED_SHORT,
bytes.remaining()));
buffers.add(bytes);
}
return new Value(buffers);
}
}
public static class Marker extends AbstractMarker
{
protected Marker(int bindIndex, ColumnSpecification receiver)
{
super(bindIndex, receiver);
assert receiver.type instanceof SetType;
}
public Value bind(QueryOptions options) throws InvalidRequestException
{
ByteBuffer value = options.getValues().get(bindIndex);
return value == null ? null : Value.fromSerialized(value, (SetType)receiver.type, options.getProtocolVersion());
}
}
public static class Setter extends Operation
{
public Setter(ColumnDefinition column, Term t)
{
super(column, t);
}
public void execute(ByteBuffer rowKey, ColumnFamily cf, Composite prefix, UpdateParameters params) throws InvalidRequestException
{
if (column.type.isMultiCell())
{
// delete + add
CellName name = cf.getComparator().create(prefix, column);
cf.addAtom(params.makeTombstoneForOverwrite(name.slice()));
}
Adder.doAdd(t, cf, prefix, column, params);
}
}
public static class Adder extends Operation
{
public Adder(ColumnDefinition column, Term t)
{
super(column, t);
}
public void execute(ByteBuffer rowKey, ColumnFamily cf, Composite prefix, UpdateParameters params) throws InvalidRequestException
{
assert column.type.isMultiCell() : "Attempted to add items to a frozen set";
doAdd(t, cf, prefix, column, params);
}
static void doAdd(Term t, ColumnFamily cf, Composite prefix, ColumnDefinition column, UpdateParameters params) throws InvalidRequestException
{
Term.Terminal value = t.bind(params.options);
Sets.Value setValue = (Sets.Value)value;
if (column.type.isMultiCell())
{
if (value == null)
return;
Set toAdd = setValue.elements;
for (ByteBuffer bb : toAdd)
{
CellName cellName = cf.getComparator().create(prefix, column, bb);
cf.addColumn(params.makeColumn(cellName, ByteBufferUtil.EMPTY_BYTE_BUFFER));
}
}
else
{
// for frozen sets, we're overwriting the whole cell
CellName cellName = cf.getComparator().create(prefix, column);
if (value == null)
cf.addAtom(params.makeTombstone(cellName));
else
cf.addColumn(params.makeColumn(cellName, ((Value) value).getWithProtocolVersion(Server.CURRENT_VERSION)));
}
}
}
// Note that this is reused for Map subtraction too (we subtract a set from a map)
public static class Discarder extends Operation
{
public Discarder(ColumnDefinition column, Term t)
{
super(column, t);
}
public void execute(ByteBuffer rowKey, ColumnFamily cf, Composite prefix, UpdateParameters params) throws InvalidRequestException
{
assert column.type.isMultiCell() : "Attempted to remove items from a frozen set";
Term.Terminal value = t.bind(params.options);
if (value == null)
return;
// This can be either a set or a single element
Set toDiscard = value instanceof Constants.Value
? Collections.singleton(((Constants.Value)value).bytes)
: ((Sets.Value)value).elements;
for (ByteBuffer bb : toDiscard)
{
cf.addColumn(params.makeTombstone(cf.getComparator().create(prefix, column, bb)));
}
}
}
}
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