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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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.marshal.*;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.ByteBufferUtil;
/**
* Static helper methods and classes for constants.
*/
public abstract class Constants
{
private static final Logger logger = LoggerFactory.getLogger(Constants.class);
public enum Type
{
STRING, INTEGER, UUID, FLOAT, BOOLEAN, HEX, DURATION;
}
private static class UnsetLiteral extends Term.Raw
{
public Term prepare(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
{
return UNSET_VALUE;
}
public AssignmentTestable.TestResult testAssignment(String keyspace, ColumnSpecification receiver)
{
return AssignmentTestable.TestResult.NOT_ASSIGNABLE;
}
public String getText()
{
return "";
}
public AbstractType getExactTypeIfKnown(String keyspace)
{
return null;
}
}
// We don't have "unset" literal in the syntax, but it's used implicitely for JSON "DEFAULT UNSET" option
public static final UnsetLiteral UNSET_LITERAL = new UnsetLiteral();
public static final Value UNSET_VALUE = new Value(ByteBufferUtil.UNSET_BYTE_BUFFER);
private static class NullLiteral extends Term.Raw
{
public Term prepare(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
{
if (!testAssignment(keyspace, receiver).isAssignable())
throw new InvalidRequestException("Invalid null value for counter increment/decrement");
return NULL_VALUE;
}
public AssignmentTestable.TestResult testAssignment(String keyspace, ColumnSpecification receiver)
{
return receiver.type instanceof CounterColumnType
? AssignmentTestable.TestResult.NOT_ASSIGNABLE
: AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
}
public String getText()
{
return "NULL";
}
public AbstractType getExactTypeIfKnown(String keyspace)
{
return null;
}
}
public static final NullLiteral NULL_LITERAL = new NullLiteral();
public static final Term.Terminal NULL_VALUE = new Value(null)
{
@Override
public Terminal bind(QueryOptions options)
{
// We return null because that makes life easier for collections
return null;
}
@Override
public String toString()
{
return "null";
}
};
public static class Literal extends Term.Raw
{
private final Type type;
private final String text;
private Literal(Type type, String text)
{
assert type != null && text != null;
this.type = type;
this.text = text;
}
public static Literal string(String text)
{
return new Literal(Type.STRING, text);
}
public static Literal integer(String text)
{
return new Literal(Type.INTEGER, text);
}
public static Literal floatingPoint(String text)
{
return new Literal(Type.FLOAT, text);
}
public static Literal uuid(String text)
{
return new Literal(Type.UUID, text);
}
public static Literal bool(String text)
{
return new Literal(Type.BOOLEAN, text);
}
public static Literal hex(String text)
{
return new Literal(Type.HEX, text);
}
public static Literal duration(String text)
{
return new Literal(Type.DURATION, text);
}
public Value prepare(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
{
if (!testAssignment(keyspace, receiver).isAssignable())
throw new InvalidRequestException(String.format("Invalid %s constant (%s) for \"%s\" of type %s", type, text, receiver.name, receiver.type.asCQL3Type()));
return new Value(parsedValue(receiver.type));
}
private ByteBuffer parsedValue(AbstractType validator) throws InvalidRequestException
{
if (validator instanceof ReversedType)
validator = ((ReversedType) validator).baseType;
try
{
if (type == Type.HEX)
// Note that validator could be BytesType, but it could also be a custom type, so
// we hardcode BytesType (rather than using 'validator') in the call below.
// Further note that BytesType doesn't want it's input prefixed by '0x', hence the substring.
return BytesType.instance.fromString(text.substring(2));
if (validator instanceof CounterColumnType)
return LongType.instance.fromString(text);
return validator.fromString(text);
}
catch (MarshalException e)
{
throw new InvalidRequestException(e.getMessage());
}
}
@Override
public AssignmentTestable.TestResult testAssignment(String keyspace, ColumnSpecification receiver)
{
CQL3Type receiverType = receiver.type.asCQL3Type();
if (receiverType.isCollection() || receiverType.isUDT())
return AssignmentTestable.TestResult.NOT_ASSIGNABLE;
if (!(receiverType instanceof CQL3Type.Native))
// Skip type validation for custom types. May or may not be a good idea
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
CQL3Type.Native nt = (CQL3Type.Native)receiverType;
switch (type)
{
case STRING:
switch (nt)
{
case ASCII:
case TEXT:
case INET:
case VARCHAR:
case DATE:
case TIME:
case TIMESTAMP:
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
}
break;
case INTEGER:
switch (nt)
{
case BIGINT:
case COUNTER:
case DATE:
case DECIMAL:
case DOUBLE:
case DURATION:
case FLOAT:
case INT:
case SMALLINT:
case TIME:
case TIMESTAMP:
case TINYINT:
case VARINT:
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
}
break;
case UUID:
switch (nt)
{
case UUID:
case TIMEUUID:
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
}
break;
case FLOAT:
switch (nt)
{
case DECIMAL:
case DOUBLE:
case FLOAT:
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
}
break;
case BOOLEAN:
switch (nt)
{
case BOOLEAN:
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
}
break;
case HEX:
switch (nt)
{
case BLOB:
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
}
break;
case DURATION:
switch (nt)
{
case DURATION:
return AssignmentTestable.TestResult.WEAKLY_ASSIGNABLE;
}
break;
}
return AssignmentTestable.TestResult.NOT_ASSIGNABLE;
}
public AbstractType getExactTypeIfKnown(String keyspace)
{
// Most constant are valid for more than one type (the extreme example being integer constants, which can
// be use for any numerical type, including date, time, ...) so they don't have an exact type. And in fact,
// for good or bad, any literal is valid for custom types, so we can never claim an exact type.
// But really, the reason it's fine to return null here is that getExactTypeIfKnown is only used to
// implement testAssignment() in Selectable and that method is overriden above.
return null;
}
public String getRawText()
{
return text;
}
public String getText()
{
return type == Type.STRING ? String.format("'%s'", text) : text;
}
}
/**
* A constant value, i.e. a ByteBuffer.
*/
public static class Value extends Term.Terminal
{
public final ByteBuffer bytes;
public Value(ByteBuffer bytes)
{
this.bytes = bytes;
}
public ByteBuffer get(ProtocolVersion protocolVersion)
{
return bytes;
}
@Override
public ByteBuffer bindAndGet(QueryOptions options)
{
return bytes;
}
@Override
public String toString()
{
return ByteBufferUtil.bytesToHex(bytes);
}
}
public static class Marker extends AbstractMarker
{
// Constructor is public only for the SuperColumn tables support
public Marker(int bindIndex, ColumnSpecification receiver)
{
super(bindIndex, receiver);
assert !receiver.type.isCollection();
}
@Override
public ByteBuffer bindAndGet(QueryOptions options) throws InvalidRequestException
{
try
{
ByteBuffer value = options.getValues().get(bindIndex);
if (value != null && value != ByteBufferUtil.UNSET_BYTE_BUFFER)
receiver.type.validate(value);
return value;
}
catch (MarshalException e)
{
throw new InvalidRequestException(e.getMessage());
}
}
public Value bind(QueryOptions options) throws InvalidRequestException
{
ByteBuffer bytes = bindAndGet(options);
if (bytes == null)
return null;
if (bytes == ByteBufferUtil.UNSET_BYTE_BUFFER)
return Constants.UNSET_VALUE;
return new Constants.Value(bytes);
}
}
public static class Setter extends Operation
{
public Setter(ColumnDefinition column, Term t)
{
super(column, t);
}
public void execute(DecoratedKey partitionKey, UpdateParameters params) throws InvalidRequestException
{
ByteBuffer value = t.bindAndGet(params.options);
if (value == null)
params.addTombstone(column);
else if (value != ByteBufferUtil.UNSET_BYTE_BUFFER) // use reference equality and not object equality
params.addCell(column, value);
}
}
public static class Adder extends Operation
{
public Adder(ColumnDefinition column, Term t)
{
super(column, t);
}
public void execute(DecoratedKey partitionKey, UpdateParameters params) throws InvalidRequestException
{
ByteBuffer bytes = t.bindAndGet(params.options);
if (bytes == null)
throw new InvalidRequestException("Invalid null value for counter increment");
if (bytes == ByteBufferUtil.UNSET_BYTE_BUFFER)
return;
long increment = ByteBufferUtil.toLong(bytes);
params.addCounter(column, increment);
}
}
public static class Substracter extends Operation
{
public Substracter(ColumnDefinition column, Term t)
{
super(column, t);
}
public void execute(DecoratedKey partitionKey, UpdateParameters params) throws InvalidRequestException
{
ByteBuffer bytes = t.bindAndGet(params.options);
if (bytes == null)
throw new InvalidRequestException("Invalid null value for counter increment");
if (bytes == ByteBufferUtil.UNSET_BYTE_BUFFER)
return;
long increment = ByteBufferUtil.toLong(bytes);
if (increment == Long.MIN_VALUE)
throw new InvalidRequestException("The negation of " + increment + " overflows supported counter precision (signed 8 bytes integer)");
params.addCounter(column, -increment);
}
}
// This happens to also handle collection because it doesn't felt worth
// duplicating this further
public static class Deleter extends Operation
{
public Deleter(ColumnDefinition column)
{
super(column, null);
}
public void execute(DecoratedKey partitionKey, UpdateParameters params) throws InvalidRequestException
{
if (column.type.isMultiCell())
params.setComplexDeletionTime(column);
else
params.addTombstone(column);
}
}
}