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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.statements;
import java.nio.ByteBuffer;
import java.util.*;
import com.google.common.collect.Iterables;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.auth.Permission;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.config.ViewDefinition;
import org.apache.cassandra.cql3.*;
import org.apache.cassandra.cql3.ColumnIdentifier.Raw;
import org.apache.cassandra.cql3.functions.Function;
import org.apache.cassandra.cql3.restrictions.StatementRestrictions;
import org.apache.cassandra.cql3.selection.Selection;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.filter.*;
import org.apache.cassandra.db.marshal.BooleanType;
import org.apache.cassandra.db.partitions.*;
import org.apache.cassandra.db.rows.RowIterator;
import org.apache.cassandra.db.view.View;
import org.apache.cassandra.exceptions.*;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.service.StorageProxy;
import org.apache.cassandra.service.paxos.Commit;
import org.apache.cassandra.thrift.ThriftValidation;
import org.apache.cassandra.transport.messages.ResultMessage;
import org.apache.cassandra.triggers.TriggerExecutor;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.Pair;
import org.apache.cassandra.utils.UUIDGen;
import static org.apache.cassandra.cql3.statements.RequestValidations.checkFalse;
import static org.apache.cassandra.cql3.statements.RequestValidations.checkNotNull;
import static org.apache.cassandra.cql3.statements.RequestValidations.checkNull;
/*
* Abstract parent class of individual modifications, i.e. INSERT, UPDATE and DELETE.
*/
public abstract class ModificationStatement implements CQLStatement
{
protected static final Logger logger = LoggerFactory.getLogger(ModificationStatement.class);
public static final String CUSTOM_EXPRESSIONS_NOT_ALLOWED =
"Custom index expressions cannot be used in WHERE clauses for UPDATE or DELETE statements";
private static final ColumnIdentifier CAS_RESULT_COLUMN = new ColumnIdentifier("[applied]", false);
protected final StatementType type;
private final int boundTerms;
public final CFMetaData cfm;
private final Attributes attrs;
private final StatementRestrictions restrictions;
private final Operations operations;
private final PartitionColumns updatedColumns;
private final Conditions conditions;
private final PartitionColumns conditionColumns;
private final PartitionColumns requiresRead;
public ModificationStatement(StatementType type,
int boundTerms,
CFMetaData cfm,
Operations operations,
StatementRestrictions restrictions,
Conditions conditions,
Attributes attrs)
{
this.type = type;
this.boundTerms = boundTerms;
this.cfm = cfm;
this.restrictions = restrictions;
this.operations = operations;
this.conditions = conditions;
this.attrs = attrs;
if (!conditions.isEmpty())
{
checkFalse(cfm.isCounter(), "Conditional updates are not supported on counter tables");
checkFalse(attrs.isTimestampSet(), "Cannot provide custom timestamp for conditional updates");
}
PartitionColumns.Builder conditionColumnsBuilder = PartitionColumns.builder();
Iterable columns = conditions.getColumns();
if (columns != null)
conditionColumnsBuilder.addAll(columns);
PartitionColumns.Builder updatedColumnsBuilder = PartitionColumns.builder();
PartitionColumns.Builder requiresReadBuilder = PartitionColumns.builder();
for (Operation operation : operations)
{
updatedColumnsBuilder.add(operation.column);
// If the operation requires a read-before-write and we're doing a conditional read, we want to read
// the affected column as part of the read-for-conditions paxos phase (see #7499).
if (operation.requiresRead())
{
conditionColumnsBuilder.add(operation.column);
requiresReadBuilder.add(operation.column);
}
}
PartitionColumns modifiedColumns = updatedColumnsBuilder.build();
// Compact tables have not row marker. So if we don't actually update any particular column,
// this means that we're only updating the PK, which we allow if only those were declared in
// the definition. In that case however, we do went to write the compactValueColumn (since again
// we can't use a "row marker") so add it automatically.
if (cfm.isCompactTable() && modifiedColumns.isEmpty() && updatesRegularRows())
modifiedColumns = cfm.partitionColumns();
this.updatedColumns = modifiedColumns;
this.conditionColumns = conditionColumnsBuilder.build();
this.requiresRead = requiresReadBuilder.build();
}
public StatementRestrictions getRestrictions()
{
return restrictions;
}
public Iterable getFunctions()
{
List functions = new ArrayList<>();
addFunctionsTo(functions);
return functions;
}
public void addFunctionsTo(List functions)
{
attrs.addFunctionsTo(functions);
restrictions.addFunctionsTo(functions);
operations.addFunctionsTo(functions);
conditions.addFunctionsTo(functions);
}
public abstract void addUpdateForKey(PartitionUpdate update, Clustering clustering, UpdateParameters params);
public abstract void addUpdateForKey(PartitionUpdate update, Slice slice, UpdateParameters params);
public int getBoundTerms()
{
return boundTerms;
}
public String keyspace()
{
return cfm.ksName;
}
public String columnFamily()
{
return cfm.cfName;
}
public boolean isCounter()
{
return cfm.isCounter();
}
public boolean isView()
{
return cfm.isView();
}
public long getTimestamp(long now, QueryOptions options) throws InvalidRequestException
{
return attrs.getTimestamp(now, options);
}
public boolean isTimestampSet()
{
return attrs.isTimestampSet();
}
public int getTimeToLive(QueryOptions options) throws InvalidRequestException
{
return attrs.getTimeToLive(options, cfm);
}
public void checkAccess(ClientState state) throws InvalidRequestException, UnauthorizedException
{
state.hasColumnFamilyAccess(keyspace(), columnFamily(), Permission.MODIFY);
// CAS updates can be used to simulate a SELECT query, so should require Permission.SELECT as well.
if (hasConditions())
state.hasColumnFamilyAccess(keyspace(), columnFamily(), Permission.SELECT);
// MV updates need to get the current state from the table, and might update the views
// Require Permission.SELECT on the base table, and Permission.MODIFY on the views
Iterator views = View.findAll(keyspace(), columnFamily()).iterator();
if (views.hasNext())
{
state.hasColumnFamilyAccess(keyspace(), columnFamily(), Permission.SELECT);
do
{
state.hasColumnFamilyAccess(keyspace(), views.next().viewName, Permission.MODIFY);
} while (views.hasNext());
}
for (Function function : getFunctions())
state.ensureHasPermission(Permission.EXECUTE, function);
}
public void validate(ClientState state) throws InvalidRequestException
{
checkFalse(hasConditions() && attrs.isTimestampSet(), "Cannot provide custom timestamp for conditional updates");
checkFalse(isCounter() && attrs.isTimestampSet(), "Cannot provide custom timestamp for counter updates");
checkFalse(isCounter() && attrs.isTimeToLiveSet(), "Cannot provide custom TTL for counter updates");
checkFalse(isView(), "Cannot directly modify a materialized view");
}
public PartitionColumns updatedColumns()
{
return updatedColumns;
}
public PartitionColumns conditionColumns()
{
return conditionColumns;
}
public boolean updatesRegularRows()
{
// We're updating regular rows if all the clustering columns are provided.
// Note that the only case where we're allowed not to provide clustering
// columns is if we set some static columns, and in that case no clustering
// columns should be given. So in practice, it's enough to check if we have
// either the table has no clustering or if it has at least one of them set.
return cfm.clusteringColumns().isEmpty() || restrictions.hasClusteringColumnsRestriction();
}
public boolean updatesStaticRow()
{
return operations.appliesToStaticColumns();
}
public List getRegularOperations()
{
return operations.regularOperations();
}
public List getStaticOperations()
{
return operations.staticOperations();
}
public Iterable allOperations()
{
return operations;
}
public Iterable getColumnsWithConditions()
{
return conditions.getColumns();
}
public boolean hasIfNotExistCondition()
{
return conditions.isIfNotExists();
}
public boolean hasIfExistCondition()
{
return conditions.isIfExists();
}
public List buildPartitionKeyNames(QueryOptions options)
throws InvalidRequestException
{
List partitionKeys = restrictions.getPartitionKeys(options);
for (ByteBuffer key : partitionKeys)
QueryProcessor.validateKey(key);
return partitionKeys;
}
public NavigableSet createClustering(QueryOptions options)
throws InvalidRequestException
{
if (appliesOnlyToStaticColumns() && !restrictions.hasClusteringColumnsRestriction())
return FBUtilities.singleton(CBuilder.STATIC_BUILDER.build(), cfm.comparator);
return restrictions.getClusteringColumns(options);
}
/**
* Checks that the modification only apply to static columns.
* @return true if the modification only apply to static columns, false otherwise.
*/
private boolean appliesOnlyToStaticColumns()
{
return appliesOnlyToStaticColumns(operations, conditions);
}
/**
* Checks that the specified operations and conditions only apply to static columns.
* @return true if the specified operations and conditions only apply to static columns,
* false otherwise.
*/
public static boolean appliesOnlyToStaticColumns(Operations operation, Conditions conditions)
{
return !operation.appliesToRegularColumns() && !conditions.appliesToRegularColumns()
&& (operation.appliesToStaticColumns() || conditions.appliesToStaticColumns());
}
public boolean requiresRead()
{
// Lists SET operation incurs a read.
for (Operation op : allOperations())
if (op.requiresRead())
return true;
return false;
}
private Map readRequiredLists(Collection partitionKeys,
ClusteringIndexFilter filter,
DataLimits limits,
boolean local,
ConsistencyLevel cl)
{
if (!requiresRead())
return null;
try
{
cl.validateForRead(keyspace());
}
catch (InvalidRequestException e)
{
throw new InvalidRequestException(String.format("Write operation require a read but consistency %s is not supported on reads", cl));
}
List commands = new ArrayList<>(partitionKeys.size());
int nowInSec = FBUtilities.nowInSeconds();
for (ByteBuffer key : partitionKeys)
commands.add(SinglePartitionReadCommand.create(cfm,
nowInSec,
ColumnFilter.selection(this.requiresRead),
RowFilter.NONE,
limits,
cfm.decorateKey(key),
filter));
SinglePartitionReadCommand.Group group = new SinglePartitionReadCommand.Group(commands, DataLimits.NONE);
if (local)
{
try (ReadOrderGroup orderGroup = group.startOrderGroup(); PartitionIterator iter = group.executeInternal(orderGroup))
{
return asMaterializedMap(iter);
}
}
try (PartitionIterator iter = group.execute(cl, null))
{
return asMaterializedMap(iter);
}
}
private Map asMaterializedMap(PartitionIterator iterator)
{
Map map = new HashMap<>();
while (iterator.hasNext())
{
try (RowIterator partition = iterator.next())
{
map.put(partition.partitionKey(), FilteredPartition.create(partition));
}
}
return map;
}
public boolean hasConditions()
{
return !conditions.isEmpty();
}
public boolean hasSlices()
{
return type.allowClusteringColumnSlices()
&& getRestrictions().hasClusteringColumnsRestriction()
&& getRestrictions().isColumnRange();
}
public ResultMessage execute(QueryState queryState, QueryOptions options)
throws RequestExecutionException, RequestValidationException
{
if (options.getConsistency() == null)
throw new InvalidRequestException("Invalid empty consistency level");
return hasConditions()
? executeWithCondition(queryState, options)
: executeWithoutCondition(queryState, options);
}
private ResultMessage executeWithoutCondition(QueryState queryState, QueryOptions options)
throws RequestExecutionException, RequestValidationException
{
ConsistencyLevel cl = options.getConsistency();
if (isCounter())
cl.validateCounterForWrite(cfm);
else
cl.validateForWrite(cfm.ksName);
Collection mutations = getMutations(options, false, options.getTimestamp(queryState));
if (!mutations.isEmpty())
StorageProxy.mutateWithTriggers(mutations, cl, false);
return null;
}
public ResultMessage executeWithCondition(QueryState queryState, QueryOptions options)
throws RequestExecutionException, RequestValidationException
{
CQL3CasRequest request = makeCasRequest(queryState, options);
try (RowIterator result = StorageProxy.cas(keyspace(),
columnFamily(),
request.key,
request,
options.getSerialConsistency(),
options.getConsistency(),
queryState.getClientState()))
{
return new ResultMessage.Rows(buildCasResultSet(result, options));
}
}
private CQL3CasRequest makeCasRequest(QueryState queryState, QueryOptions options)
{
List keys = buildPartitionKeyNames(options);
// We don't support IN for CAS operation so far
checkFalse(restrictions.keyIsInRelation(),
"IN on the partition key is not supported with conditional %s",
type.isUpdate()? "updates" : "deletions");
DecoratedKey key = cfm.decorateKey(keys.get(0));
long now = options.getTimestamp(queryState);
checkFalse(restrictions.clusteringKeyRestrictionsHasIN(),
"IN on the clustering key columns is not supported with conditional %s",
type.isUpdate()? "updates" : "deletions");
Clustering clustering = Iterables.getOnlyElement(createClustering(options));
CQL3CasRequest request = new CQL3CasRequest(cfm, key, false, conditionColumns(), updatesRegularRows(), updatesStaticRow());
addConditions(clustering, request, options);
request.addRowUpdate(clustering, this, options, now);
return request;
}
public void addConditions(Clustering clustering, CQL3CasRequest request, QueryOptions options) throws InvalidRequestException
{
conditions.addConditionsTo(request, clustering, options);
}
private ResultSet buildCasResultSet(RowIterator partition, QueryOptions options) throws InvalidRequestException
{
return buildCasResultSet(keyspace(), columnFamily(), partition, getColumnsWithConditions(), false, options);
}
public static ResultSet buildCasResultSet(String ksName, String tableName, RowIterator partition, Iterable columnsWithConditions, boolean isBatch, QueryOptions options)
throws InvalidRequestException
{
boolean success = partition == null;
ColumnSpecification spec = new ColumnSpecification(ksName, tableName, CAS_RESULT_COLUMN, BooleanType.instance);
ResultSet.ResultMetadata metadata = new ResultSet.ResultMetadata(Collections.singletonList(spec));
List> rows = Collections.singletonList(Collections.singletonList(BooleanType.instance.decompose(success)));
ResultSet rs = new ResultSet(metadata, rows);
return success ? rs : merge(rs, buildCasFailureResultSet(partition, columnsWithConditions, isBatch, options));
}
private static ResultSet merge(ResultSet left, ResultSet right)
{
if (left.size() == 0)
return right;
else if (right.size() == 0)
return left;
assert left.size() == 1;
int size = left.metadata.names.size() + right.metadata.names.size();
List specs = new ArrayList(size);
specs.addAll(left.metadata.names);
specs.addAll(right.metadata.names);
List> rows = new ArrayList<>(right.size());
for (int i = 0; i < right.size(); i++)
{
List row = new ArrayList(size);
row.addAll(left.rows.get(0));
row.addAll(right.rows.get(i));
rows.add(row);
}
return new ResultSet(new ResultSet.ResultMetadata(specs), rows);
}
private static ResultSet buildCasFailureResultSet(RowIterator partition, Iterable columnsWithConditions, boolean isBatch, QueryOptions options)
throws InvalidRequestException
{
CFMetaData cfm = partition.metadata();
Selection selection;
if (columnsWithConditions == null)
{
selection = Selection.wildcard(cfm);
}
else
{
// We can have multiple conditions on the same columns (for collections) so use a set
// to avoid duplicate, but preserve the order just to it follows the order of IF in the query in general
Set defs = new LinkedHashSet<>();
// Adding the partition key for batches to disambiguate if the conditions span multipe rows (we don't add them outside
// of batches for compatibility sakes).
if (isBatch)
{
defs.addAll(cfm.partitionKeyColumns());
defs.addAll(cfm.clusteringColumns());
}
if (cfm.isSuper() && cfm.isDense())
{
defs.add(cfm.superColumnValueColumn());
}
else
{
for (ColumnDefinition def : columnsWithConditions)
defs.add(def);
}
selection = Selection.forColumns(cfm, new ArrayList<>(defs));
}
Selection.ResultSetBuilder builder = selection.resultSetBuilder(false);
SelectStatement.forSelection(cfm, selection).processPartition(partition, options, builder, FBUtilities.nowInSeconds());
return builder.build(options.getProtocolVersion());
}
public ResultMessage executeInternal(QueryState queryState, QueryOptions options) throws RequestValidationException, RequestExecutionException
{
return hasConditions()
? executeInternalWithCondition(queryState, options)
: executeInternalWithoutCondition(queryState, options);
}
public ResultMessage executeInternalWithoutCondition(QueryState queryState, QueryOptions options) throws RequestValidationException, RequestExecutionException
{
for (IMutation mutation : getMutations(options, true, queryState.getTimestamp()))
{
assert mutation instanceof Mutation || mutation instanceof CounterMutation;
if (mutation instanceof Mutation)
((Mutation) mutation).apply();
else if (mutation instanceof CounterMutation)
((CounterMutation) mutation).apply();
}
return null;
}
public ResultMessage executeInternalWithCondition(QueryState state, QueryOptions options) throws RequestValidationException, RequestExecutionException
{
CQL3CasRequest request = makeCasRequest(state, options);
try (RowIterator result = casInternal(request, state))
{
return new ResultMessage.Rows(buildCasResultSet(result, options));
}
}
static RowIterator casInternal(CQL3CasRequest request, QueryState state)
{
UUID ballot = UUIDGen.getTimeUUIDFromMicros(state.getTimestamp());
SinglePartitionReadCommand readCommand = request.readCommand(FBUtilities.nowInSeconds());
FilteredPartition current;
try (ReadOrderGroup orderGroup = readCommand.startOrderGroup(); PartitionIterator iter = readCommand.executeInternal(orderGroup))
{
current = FilteredPartition.create(PartitionIterators.getOnlyElement(iter, readCommand));
}
if (!request.appliesTo(current))
return current.rowIterator();
PartitionUpdate updates = request.makeUpdates(current);
updates = TriggerExecutor.instance.execute(updates);
Commit proposal = Commit.newProposal(ballot, updates);
proposal.makeMutation().apply();
return null;
}
/**
* Convert statement into a list of mutations to apply on the server
*
* @param options value for prepared statement markers
* @param local if true, any requests (for collections) performed by getMutation should be done locally only.
* @param now the current timestamp in microseconds to use if no timestamp is user provided.
*
* @return list of the mutations
*/
private Collection getMutations(QueryOptions options, boolean local, long now)
{
UpdatesCollector collector = new UpdatesCollector(Collections.singletonMap(cfm.cfId, updatedColumns), 1);
addUpdates(collector, options, local, now);
collector.validateIndexedColumns();
return collector.toMutations();
}
final void addUpdates(UpdatesCollector collector,
QueryOptions options,
boolean local,
long now)
{
List keys = buildPartitionKeyNames(options);
if (hasSlices())
{
Slices slices = createSlices(options);
// If all the ranges were invalid we do not need to do anything.
if (slices.isEmpty())
return;
UpdateParameters params = makeUpdateParameters(keys,
new ClusteringIndexSliceFilter(slices, false),
options,
DataLimits.NONE,
local,
now);
for (ByteBuffer key : keys)
{
ThriftValidation.validateKey(cfm, key);
DecoratedKey dk = cfm.decorateKey(key);
PartitionUpdate upd = collector.getPartitionUpdate(cfm, dk, options.getConsistency());
for (Slice slice : slices)
addUpdateForKey(upd, slice, params);
}
}
else
{
NavigableSet clusterings = createClustering(options);
// If some of the restrictions were unspecified (e.g. empty IN restrictions) we do not need to do anything.
if (restrictions.hasClusteringColumnsRestriction() && clusterings.isEmpty())
return;
UpdateParameters params = makeUpdateParameters(keys, clusterings, options, local, now);
for (ByteBuffer key : keys)
{
ThriftValidation.validateKey(cfm, key);
DecoratedKey dk = cfm.decorateKey(key);
PartitionUpdate upd = collector.getPartitionUpdate(cfm, dk, options.getConsistency());
if (!restrictions.hasClusteringColumnsRestriction())
{
addUpdateForKey(upd, Clustering.EMPTY, params);
}
else
{
for (Clustering clustering : clusterings)
{
for (ByteBuffer c : clustering.getRawValues())
{
if (c != null && c.remaining() > FBUtilities.MAX_UNSIGNED_SHORT)
throw new InvalidRequestException(String.format("Key length of %d is longer than maximum of %d",
clustering.dataSize(),
FBUtilities.MAX_UNSIGNED_SHORT));
}
addUpdateForKey(upd, clustering, params);
}
}
}
}
}
Slices createSlices(QueryOptions options)
{
SortedSet startBounds = restrictions.getClusteringColumnsBounds(Bound.START, options);
SortedSet endBounds = restrictions.getClusteringColumnsBounds(Bound.END, options);
return toSlices(startBounds, endBounds);
}
private UpdateParameters makeUpdateParameters(Collection keys,
NavigableSet clusterings,
QueryOptions options,
boolean local,
long now)
{
if (clusterings.contains(Clustering.STATIC_CLUSTERING))
return makeUpdateParameters(keys,
new ClusteringIndexSliceFilter(Slices.ALL, false),
options,
DataLimits.cqlLimits(1),
local,
now);
return makeUpdateParameters(keys,
new ClusteringIndexNamesFilter(clusterings, false),
options,
DataLimits.NONE,
local,
now);
}
private UpdateParameters makeUpdateParameters(Collection keys,
ClusteringIndexFilter filter,
QueryOptions options,
DataLimits limits,
boolean local,
long now)
{
// Some lists operation requires reading
Map lists = readRequiredLists(keys, filter, limits, local, options.getConsistency());
return new UpdateParameters(cfm, updatedColumns(), options, getTimestamp(now, options), getTimeToLive(options), lists);
}
private Slices toSlices(SortedSet startBounds, SortedSet endBounds)
{
assert startBounds.size() == endBounds.size();
Slices.Builder builder = new Slices.Builder(cfm.comparator);
Iterator starts = startBounds.iterator();
Iterator ends = endBounds.iterator();
while (starts.hasNext())
{
Slice slice = Slice.make(starts.next(), ends.next());
if (!slice.isEmpty(cfm.comparator))
{
builder.add(slice);
}
}
return builder.build();
}
public static abstract class Parsed extends CFStatement
{
protected final StatementType type;
private final Attributes.Raw attrs;
private final List> conditions;
private final boolean ifNotExists;
private final boolean ifExists;
protected Parsed(CFName name,
StatementType type,
Attributes.Raw attrs,
List> conditions,
boolean ifNotExists,
boolean ifExists)
{
super(name);
this.type = type;
this.attrs = attrs;
this.conditions = conditions == null ? Collections.>emptyList() : conditions;
this.ifNotExists = ifNotExists;
this.ifExists = ifExists;
}
public ParsedStatement.Prepared prepare(ClientState clientState)
{
VariableSpecifications boundNames = getBoundVariables();
ModificationStatement statement = prepare(boundNames, clientState);
return new ParsedStatement.Prepared(statement, boundNames, boundNames.getPartitionKeyBindIndexes(statement.cfm), statement.cfm.ksName, isFullyQualified());
}
public ModificationStatement prepare(VariableSpecifications boundNames, ClientState clientState)
{
CFMetaData metadata = ThriftValidation.validateColumnFamilyWithCompactMode(keyspace(), columnFamily(), clientState.isNoCompactMode());
Attributes preparedAttributes = attrs.prepare(keyspace(), columnFamily());
preparedAttributes.collectMarkerSpecification(boundNames);
Conditions preparedConditions = prepareConditions(metadata, boundNames);
return prepareInternal(metadata,
boundNames,
preparedConditions,
preparedAttributes);
}
/**
* Returns the column conditions.
*
* @param metadata the column family meta data
* @param boundNames the bound names
* @return the column conditions.
*/
private Conditions prepareConditions(CFMetaData metadata, VariableSpecifications boundNames)
{
// To have both 'IF EXISTS'/'IF NOT EXISTS' and some other conditions doesn't make sense.
// So far this is enforced by the parser, but let's assert it for sanity if ever the parse changes.
if (ifExists)
{
assert conditions.isEmpty();
assert !ifNotExists;
return Conditions.IF_EXISTS_CONDITION;
}
if (ifNotExists)
{
assert conditions.isEmpty();
assert !ifExists;
return Conditions.IF_NOT_EXISTS_CONDITION;
}
if (conditions.isEmpty())
return Conditions.EMPTY_CONDITION;
return prepareColumnConditions(metadata, boundNames);
}
/**
* Returns the column conditions.
*
* @param metadata the column family meta data
* @param boundNames the bound names
* @return the column conditions.
*/
private ColumnConditions prepareColumnConditions(CFMetaData metadata, VariableSpecifications boundNames)
{
checkNull(attrs.timestamp, "Cannot provide custom timestamp for conditional updates");
ColumnConditions.Builder builder = ColumnConditions.newBuilder();
for (Pair entry : conditions)
{
ColumnIdentifier id = entry.left.prepare(metadata);
ColumnDefinition def = metadata.getColumnDefinitionForCQL(id);
checkNotNull(def, "Unknown identifier %s in IF conditions", id);
ColumnCondition condition = entry.right.prepare(keyspace(), def);
condition.collectMarkerSpecification(boundNames);
checkFalse(def.isPrimaryKeyColumn(), "PRIMARY KEY column '%s' cannot have IF conditions", id);
builder.add(condition);
}
return builder.build();
}
protected abstract ModificationStatement prepareInternal(CFMetaData cfm,
VariableSpecifications boundNames,
Conditions conditions,
Attributes attrs);
/**
* Creates the restrictions.
*
* @param cfm the column family meta data
* @param boundNames the bound names
* @param operations the column operations
* @param where the where clause
* @param conditions the conditions
* @return the restrictions
*/
protected StatementRestrictions newRestrictions(CFMetaData cfm,
VariableSpecifications boundNames,
Operations operations,
WhereClause where,
Conditions conditions)
{
if (where.containsCustomExpressions())
throw new InvalidRequestException(CUSTOM_EXPRESSIONS_NOT_ALLOWED);
boolean applyOnlyToStaticColumns = appliesOnlyToStaticColumns(operations, conditions);
return new StatementRestrictions(type, cfm, where, boundNames, applyOnlyToStaticColumns, false, false, false);
}
/**
* Retrieves the ColumnDefinition corresponding to the specified raw ColumnIdentifier.
*
* @param cfm the column family meta data
* @param rawId the raw ColumnIdentifier
* @return the ColumnDefinition corresponding to the specified raw ColumnIdentifier
*/
protected static ColumnDefinition getColumnDefinition(CFMetaData cfm, Raw rawId)
{
ColumnIdentifier id = rawId.prepare(cfm);
return checkNotNull(cfm.getColumnDefinitionForCQL(id), "Unknown identifier %s", id);
}
}
}
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