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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.db.marshal;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Consumer;
import org.apache.cassandra.cql3.Lists;
import org.apache.cassandra.cql3.Term;
import org.apache.cassandra.db.rows.Cell;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.exceptions.SyntaxException;
import org.apache.cassandra.serializers.ListSerializer;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.utils.JsonUtils;
import org.apache.cassandra.utils.TimeUUID;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.bytecomparable.ByteComparable.Version;
import org.apache.cassandra.utils.bytecomparable.ByteSource;
public class ListType extends CollectionType>
{
// interning instances
private static final ConcurrentHashMap, ListType> instances = new ConcurrentHashMap<>();
private static final ConcurrentHashMap, ListType> frozenInstances = new ConcurrentHashMap<>();
private final AbstractType elements;
public final ListSerializer serializer;
private final boolean isMultiCell;
public static ListType getInstance(TypeParser parser) throws ConfigurationException, SyntaxException
{
List> l = parser.getTypeParameters();
if (l.size() != 1)
throw new ConfigurationException("ListType takes exactly 1 type parameter");
return getInstance(l.get(0).freeze(), true);
}
public static ListType getInstance(AbstractType elements, boolean isMultiCell)
{
ConcurrentHashMap, ListType> internMap = isMultiCell ? instances : frozenInstances;
ListType t = internMap.get(elements);
return null == t
? internMap.computeIfAbsent(elements, k -> new ListType<>(k, isMultiCell))
: t;
}
private ListType(AbstractType elements, boolean isMultiCell)
{
super(ComparisonType.CUSTOM, Kind.LIST);
this.elements = elements;
this.serializer = ListSerializer.getInstance(elements.getSerializer());
this.isMultiCell = isMultiCell;
}
@Override
public boolean referencesUserType(V name, ValueAccessor accessor)
{
return elements.referencesUserType(name, accessor);
}
@Override
public ListType withUpdatedUserType(UserType udt)
{
if (!referencesUserType(udt.name))
return this;
(isMultiCell ? instances : frozenInstances).remove(elements);
return getInstance(elements.withUpdatedUserType(udt), isMultiCell);
}
@Override
public AbstractType expandUserTypes()
{
return getInstance(elements.expandUserTypes(), isMultiCell);
}
@Override
public boolean referencesDuration()
{
return getElementsType().referencesDuration();
}
public AbstractType getElementsType()
{
return elements;
}
public AbstractType nameComparator()
{
return TimeUUIDType.instance;
}
public AbstractType valueComparator()
{
return elements;
}
public ListSerializer getSerializer()
{
return serializer;
}
@Override
public AbstractType freeze()
{
// freeze elements to match org.apache.cassandra.cql3.CQL3Type.Raw.RawCollection.freeze
return isMultiCell ? getInstance(this.elements.freeze(), false) : this;
}
@Override
public AbstractType unfreeze()
{
return isMultiCell ? this : getInstance(this.elements, true);
}
@Override
public AbstractType freezeNestedMulticellTypes()
{
if (!isMultiCell())
return this;
if (elements.isFreezable() && elements.isMultiCell())
return getInstance(elements.freeze(), isMultiCell);
return getInstance(elements.freezeNestedMulticellTypes(), isMultiCell);
}
@Override
public List> subTypes()
{
return Collections.singletonList(elements);
}
@Override
public boolean isMultiCell()
{
return isMultiCell;
}
@Override
public boolean isCompatibleWithFrozen(CollectionType previous)
{
assert !isMultiCell;
return this.elements.isCompatibleWith(((ListType) previous).elements);
}
@Override
public boolean isValueCompatibleWithFrozen(CollectionType previous)
{
assert !isMultiCell;
return this.elements.isValueCompatibleWithInternal(((ListType) previous).elements);
}
public int compareCustom(VL left, ValueAccessor accessorL, VR right, ValueAccessor accessorR)
{
return compareListOrSet(elements, left, accessorL, right, accessorR);
}
@Override
public ByteSource asComparableBytes(ValueAccessor accessor, V data, Version version)
{
return asComparableBytesListOrSet(getElementsType(), accessor, data, version);
}
@Override
public V fromComparableBytes(ValueAccessor accessor, ByteSource.Peekable comparableBytes, Version version)
{
return fromComparableBytesListOrSet(accessor, comparableBytes, version, getElementsType());
}
@Override
public String toString(boolean ignoreFreezing)
{
boolean includeFrozenType = !ignoreFreezing && !isMultiCell();
StringBuilder sb = new StringBuilder();
if (includeFrozenType)
sb.append(FrozenType.class.getName()).append("(");
sb.append(getClass().getName());
sb.append(TypeParser.stringifyTypeParameters(Collections.>singletonList(elements), ignoreFreezing || !isMultiCell));
if (includeFrozenType)
sb.append(")");
return sb.toString();
}
public List serializedValues(Iterator> cells)
{
assert isMultiCell;
List bbs = new ArrayList();
while (cells.hasNext())
bbs.add(cells.next().buffer());
return bbs;
}
@Override
public Term fromJSONObject(Object parsed) throws MarshalException
{
if (parsed instanceof String)
parsed = JsonUtils.decodeJson((String) parsed);
if (!(parsed instanceof List))
throw new MarshalException(String.format(
"Expected a list, but got a %s: %s", parsed.getClass().getSimpleName(), parsed));
List list = (List) parsed;
List terms = new ArrayList<>(list.size());
for (Object element : list)
{
if (element == null)
throw new MarshalException("Invalid null element in list");
terms.add(elements.fromJSONObject(element));
}
return new Lists.DelayedValue(terms);
}
public ByteBuffer getSliceFromSerialized(ByteBuffer collection, ByteBuffer from, ByteBuffer to)
{
// We don't support slicing on lists so we don't need that function
throw new UnsupportedOperationException();
}
@Override
public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
{
return setOrListToJsonString(buffer, elements, protocolVersion);
}
@Override
public void forEach(ByteBuffer input, Consumer action)
{
serializer.forEach(input, action);
}
@Override
public ByteBuffer getMaskedValue()
{
return decompose(Collections.emptyList());
}
}