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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 java.util.stream.Collectors;
import org.apache.cassandra.schema.ColumnMetadata;
import org.apache.cassandra.cql3.functions.Function;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.marshal.*;
import org.apache.cassandra.db.rows.CellPath;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.ByteBufferUtil;
import static org.apache.cassandra.cql3.Constants.UNSET_VALUE;
/**
* Static helper methods and classes for user types.
*/
public abstract class UserTypes
{
private UserTypes() {}
public static ColumnSpecification fieldSpecOf(ColumnSpecification column, int field)
{
UserType ut = (UserType)column.type;
return new ColumnSpecification(column.ksName,
column.cfName,
new ColumnIdentifier(column.name + "." + ut.fieldName(field), true),
ut.fieldType(field));
}
public static void validateUserTypeAssignableTo(ColumnSpecification receiver,
Map entries)
{
if (!receiver.type.isUDT())
throw new InvalidRequestException(String.format("Invalid user type literal for %s of type %s", receiver, receiver.type.asCQL3Type()));
UserType ut = (UserType) receiver.type;
for (int i = 0; i < ut.size(); i++)
{
FieldIdentifier field = ut.fieldName(i);
T value = entries.get(field);
if (value == null)
continue;
ColumnSpecification fieldSpec = fieldSpecOf(receiver, i);
if (!value.testAssignment(receiver.ksName, fieldSpec).isAssignable())
{
throw new InvalidRequestException(String.format("Invalid user type literal for %s: field %s is not of type %s",
receiver, field, fieldSpec.type.asCQL3Type()));
}
}
}
/**
* Tests that the map with the specified entries can be assigned to the specified column.
*
* @param receiver the receiving column
* @param entries the map entries
*/
public static AssignmentTestable.TestResult testUserTypeAssignment(ColumnSpecification receiver,
Map entries)
{
try
{
validateUserTypeAssignableTo(receiver, entries);
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
}
catch (InvalidRequestException e)
{
return AssignmentTestable.TestResult.NOT_ASSIGNABLE;
}
}
/**
* Create a {@code String} representation of the user type from the specified items associated to
* the user type entries.
*
* @param items items associated to the user type entries
* @return a {@code String} representation of the user type
*/
public static String userTypeToString(Map items)
{
return userTypeToString(items, Object::toString);
}
/**
* Create a {@code String} representation of the user type from the specified items associated to
* the user type entries.
*
* @param items items associated to the user type entries
* @return a {@code String} representation of the user type
*/
public static String userTypeToString(Map items,
java.util.function.Function mapper)
{
return items.entrySet()
.stream()
.map(p -> String.format("%s: %s", p.getKey(), mapper.apply(p.getValue())))
.collect(Collectors.joining(", ", "{", "}"));
}
public static class Literal extends Term.Raw
{
public final Map entries;
public Literal(Map entries)
{
this.entries = entries;
}
public Term prepare(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
{
validateAssignableTo(keyspace, receiver);
UserType ut = (UserType)receiver.type;
boolean allTerminal = true;
List values = new ArrayList<>(entries.size());
int foundValues = 0;
for (int i = 0; i < ut.size(); i++)
{
FieldIdentifier field = ut.fieldName(i);
Term.Raw raw = entries.get(field);
if (raw == null)
raw = Constants.NULL_LITERAL;
else
++foundValues;
Term value = raw.prepare(keyspace, fieldSpecOf(receiver, i));
if (value instanceof Term.NonTerminal)
allTerminal = false;
values.add(value);
}
if (foundValues != entries.size())
{
// We had some field that are not part of the type
for (FieldIdentifier id : entries.keySet())
{
if (!ut.fieldNames().contains(id))
throw new InvalidRequestException(String.format("Unknown field '%s' in value of user defined type %s", id, ut.getNameAsString()));
}
}
DelayedValue value = new DelayedValue(((UserType)receiver.type), values);
return allTerminal ? value.bind(QueryOptions.DEFAULT) : value;
}
private void validateAssignableTo(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
{
if (!receiver.type.isUDT())
throw new InvalidRequestException(String.format("Invalid user type literal for %s of type %s", receiver.name, receiver.type.asCQL3Type()));
UserType ut = (UserType)receiver.type;
for (int i = 0; i < ut.size(); i++)
{
FieldIdentifier field = ut.fieldName(i);
Term.Raw value = entries.get(field);
if (value == null)
continue;
ColumnSpecification fieldSpec = fieldSpecOf(receiver, i);
if (!value.testAssignment(keyspace, fieldSpec).isAssignable())
{
throw new InvalidRequestException(String.format("Invalid user type literal for %s: field %s is not of type %s",
receiver.name, field, fieldSpec.type.asCQL3Type()));
}
}
}
public AssignmentTestable.TestResult testAssignment(String keyspace, ColumnSpecification receiver)
{
return testUserTypeAssignment(receiver, entries);
}
public AbstractType getExactTypeIfKnown(String keyspace)
{
return null;
}
public String getText()
{
return userTypeToString(entries, Term.Raw::getText);
}
}
public static class Value extends Term.MultiItemTerminal
{
private final UserType type;
public final ByteBuffer[] elements;
public Value(UserType type, ByteBuffer[] elements)
{
this.type = type;
this.elements = elements;
}
public static Value fromSerialized(ByteBuffer bytes, UserType type)
{
type.validate(bytes);
return new Value(type, type.split(bytes));
}
public ByteBuffer get(ProtocolVersion protocolVersion)
{
return TupleType.buildValue(elements);
}
public boolean equals(UserType userType, Value v)
{
if (elements.length != v.elements.length)
return false;
for (int i = 0; i < elements.length; i++)
if (userType.fieldType(i).compare(elements[i], v.elements[i]) != 0)
return false;
return true;
}
public List getElements()
{
return Arrays.asList(elements);
}
}
public static class DelayedValue extends Term.NonTerminal
{
private final UserType type;
private final List values;
public DelayedValue(UserType type, List values)
{
this.type = type;
this.values = values;
}
public void addFunctionsTo(List functions)
{
Terms.addFunctions(values, functions);
}
public boolean containsBindMarker()
{
for (Term t : values)
if (t.containsBindMarker())
return true;
return false;
}
public void collectMarkerSpecification(VariableSpecifications boundNames)
{
for (int i = 0; i < type.size(); i++)
values.get(i).collectMarkerSpecification(boundNames);
}
private ByteBuffer[] bindInternal(QueryOptions options) throws InvalidRequestException
{
if (values.size() > type.size())
{
throw new InvalidRequestException(String.format(
"UDT value contained too many fields (expected %s, got %s)", type.size(), values.size()));
}
ByteBuffer[] buffers = new ByteBuffer[values.size()];
for (int i = 0; i < type.size(); i++)
{
buffers[i] = values.get(i).bindAndGet(options);
// Since a frozen UDT value is always written in its entirety Cassandra can't preserve a pre-existing
// value by 'not setting' the new value. Reject the query.
if (!type.isMultiCell() && buffers[i] == ByteBufferUtil.UNSET_BYTE_BUFFER)
throw new InvalidRequestException(String.format("Invalid unset value for field '%s' of user defined type %s", type.fieldNameAsString(i), type.getNameAsString()));
}
return buffers;
}
public Value bind(QueryOptions options) throws InvalidRequestException
{
return new Value(type, bindInternal(options));
}
@Override
public ByteBuffer bindAndGet(QueryOptions options) throws InvalidRequestException
{
return UserType.buildValue(bindInternal(options));
}
}
public static class Marker extends AbstractMarker
{
protected Marker(int bindIndex, ColumnSpecification receiver)
{
super(bindIndex, receiver);
assert receiver.type.isUDT();
}
public Terminal bind(QueryOptions options) throws InvalidRequestException
{
ByteBuffer value = options.getValues().get(bindIndex);
if (value == null)
return null;
if (value == ByteBufferUtil.UNSET_BYTE_BUFFER)
return UNSET_VALUE;
return Value.fromSerialized(value, (UserType) receiver.type);
}
}
public static class Setter extends Operation
{
public Setter(ColumnMetadata column, Term t)
{
super(column, t);
}
public void execute(DecoratedKey partitionKey, UpdateParameters params) throws InvalidRequestException
{
Term.Terminal value = t.bind(params.options);
if (value == UNSET_VALUE)
return;
Value userTypeValue = (Value) value;
if (column.type.isMultiCell())
{
// setting a whole UDT at once means we overwrite all cells, so delete existing cells
params.setComplexDeletionTimeForOverwrite(column);
if (value == null)
return;
Iterator fieldNameIter = userTypeValue.type.fieldNames().iterator();
for (ByteBuffer buffer : userTypeValue.elements)
{
assert fieldNameIter.hasNext();
FieldIdentifier fieldName = fieldNameIter.next();
if (buffer == null)
continue;
CellPath fieldPath = userTypeValue.type.cellPathForField(fieldName);
params.addCell(column, fieldPath, buffer);
}
}
else
{
// for frozen UDTs, we're overwriting the whole cell value
if (value == null)
params.addTombstone(column);
else
params.addCell(column, value.get(params.options.getProtocolVersion()));
}
}
}
public static class SetterByField extends Operation
{
private final FieldIdentifier field;
public SetterByField(ColumnMetadata column, FieldIdentifier field, Term t)
{
super(column, t);
this.field = field;
}
public void execute(DecoratedKey partitionKey, UpdateParameters params) throws InvalidRequestException
{
// we should not get here for frozen UDTs
assert column.type.isMultiCell() : "Attempted to set an individual field on a frozen UDT";
Term.Terminal value = t.bind(params.options);
if (value == UNSET_VALUE)
return;
CellPath fieldPath = ((UserType) column.type).cellPathForField(field);
if (value == null)
params.addTombstone(column, fieldPath);
else
params.addCell(column, fieldPath, value.get(params.options.getProtocolVersion()));
}
}
public static class DeleterByField extends Operation
{
private final FieldIdentifier field;
public DeleterByField(ColumnMetadata column, FieldIdentifier field)
{
super(column, null);
this.field = field;
}
public void execute(DecoratedKey partitionKey, UpdateParameters params) throws InvalidRequestException
{
// we should not get here for frozen UDTs
assert column.type.isMultiCell() : "Attempted to delete a single field from a frozen UDT";
CellPath fieldPath = ((UserType) column.type).cellPathForField(field);
params.addTombstone(column, fieldPath);
}
}
}