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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.selection;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import com.google.common.base.Objects;
import org.apache.cassandra.schema.ColumnMetadata;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.cql3.ColumnSpecification;
import org.apache.cassandra.cql3.FieldIdentifier;
import org.apache.cassandra.cql3.QueryOptions;
import org.apache.cassandra.cql3.UserTypes;
import org.apache.cassandra.cql3.functions.Function;
import org.apache.cassandra.db.TypeSizes;
import org.apache.cassandra.db.filter.ColumnFilter;
import org.apache.cassandra.db.filter.ColumnFilter.Builder;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.db.marshal.TupleType;
import org.apache.cassandra.db.marshal.UserType;
import org.apache.cassandra.io.util.DataInputPlus;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.ByteBufferUtil;
/**
* Selector for literal map (e.g. {'min' : min(value), 'max' : max(value), 'count' : count(value)}).
*
*/
final class UserTypeSelector extends Selector
{
protected static final SelectorDeserializer deserializer = new SelectorDeserializer()
{
protected Selector deserialize(DataInputPlus in, int version, TableMetadata metadata) throws IOException
{
UserType type = (UserType) readType(metadata, in);
int size = in.readUnsignedVInt32();
Map fields = new HashMap<>(size);
for (int i = 0; i < size; i++)
{
FieldIdentifier identifier = new FieldIdentifier(ByteBufferUtil.readWithVIntLength(in));
Selector selector = serializer.deserialize(in, version, metadata);
fields.put(identifier, selector);
}
return new UserTypeSelector(type, fields);
}
};
/**
* The map type.
*/
private final AbstractType type;
/**
* The user type fields
*/
private final Map fields;
public static Factory newFactory(final AbstractType type, final Map factories)
{
return new Factory()
{
protected String getColumnName()
{
return UserTypes.userTypeToString(factories, Factory::getColumnName);
}
protected AbstractType getReturnType()
{
return type;
}
protected final void addColumnMapping(SelectionColumnMapping mapping, ColumnSpecification resultsColumn)
{
SelectionColumnMapping tmpMapping = SelectionColumnMapping.newMapping();
for (Factory factory : factories.values())
{
factory.addColumnMapping(tmpMapping, resultsColumn);
}
if (tmpMapping.getMappings().get(resultsColumn).isEmpty())
// add a null mapping for cases where the collection is empty
mapping.addMapping(resultsColumn, (ColumnMetadata)null);
else
// collate the mapped columns from the child factories & add those
mapping.addMapping(resultsColumn, tmpMapping.getMappings().values());
}
public Selector newInstance(final QueryOptions options)
{
Map fields = new HashMap<>(factories.size());
for (Entry factory : factories.entrySet())
fields.put(factory.getKey(), factory.getValue().newInstance(options));
return new UserTypeSelector(type, fields);
}
@Override
public boolean isAggregateSelectorFactory()
{
for (Factory factory : factories.values())
{
if (factory.isAggregateSelectorFactory())
return true;
}
return false;
}
@Override
public void addFunctionsTo(List functions)
{
for (Factory factory : factories.values())
factory.addFunctionsTo(functions);
}
@Override
public boolean isWritetimeSelectorFactory()
{
for (Factory factory : factories.values())
{
if (factory.isWritetimeSelectorFactory())
return true;
}
return false;
}
@Override
public boolean isTTLSelectorFactory()
{
for (Factory factory : factories.values())
{
if (factory.isTTLSelectorFactory())
return true;
}
return false;
}
@Override
boolean areAllFetchedColumnsKnown()
{
for (Factory factory : factories.values())
{
if (!factory.areAllFetchedColumnsKnown())
return false;
}
return true;
}
@Override
void addFetchedColumns(Builder builder)
{
for (Factory factory : factories.values())
factory.addFetchedColumns(builder);
}
};
}
public void addFetchedColumns(ColumnFilter.Builder builder)
{
for (Selector field : fields.values())
field.addFetchedColumns(builder);
}
public void addInput(InputRow input)
{
for (Selector field : fields.values())
field.addInput(input);
}
public ByteBuffer getOutput(ProtocolVersion protocolVersion)
{
UserType userType = (UserType) type;
ByteBuffer[] buffers = new ByteBuffer[userType.size()];
for (int i = 0, m = userType.size(); i < m; i++)
{
Selector selector = fields.get(userType.fieldName(i));
if (selector != null)
buffers[i] = selector.getOutput(protocolVersion);
}
return TupleType.buildValue(buffers);
}
public void reset()
{
for (Selector field : fields.values())
field.reset();
}
@Override
public boolean isTerminal()
{
for (Selector field : fields.values())
{
if(!field.isTerminal())
return false;
}
return true;
}
public AbstractType getType()
{
return type;
}
@Override
public String toString()
{
return UserTypes.userTypeToString(fields);
}
private UserTypeSelector(AbstractType type, Map fields)
{
super(Kind.USER_TYPE_SELECTOR);
this.type = type;
this.fields = fields;
}
@Override
public boolean equals(Object o)
{
if (this == o)
return true;
if (!(o instanceof UserTypeSelector))
return false;
UserTypeSelector s = (UserTypeSelector) o;
return Objects.equal(type, s.type)
&& Objects.equal(fields, s.fields);
}
@Override
public int hashCode()
{
return Objects.hashCode(type, fields);
}
@Override
protected int serializedSize(int version)
{
int size = sizeOf(type) + TypeSizes.sizeofUnsignedVInt(fields.size());
for (Map.Entry field : fields.entrySet())
size += ByteBufferUtil.serializedSizeWithVIntLength(field.getKey().bytes) + serializer.serializedSize(field.getValue(), version);
return size;
}
@Override
protected void serialize(DataOutputPlus out, int version) throws IOException
{
writeType(out, type);
out.writeUnsignedVInt32(fields.size());
for (Map.Entry field : fields.entrySet())
{
ByteBufferUtil.writeWithVIntLength(field.getKey().bytes, out);
serializer.serialize(field.getValue(), out, version);
}
}
}