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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.functions;
import java.nio.ByteBuffer;
import java.util.List;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.cql3.Duration;
import org.apache.cassandra.db.marshal.*;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.TimeUUID;
import static org.apache.cassandra.cql3.statements.RequestValidations.invalidRequest;
public abstract class TimeFcts
{
public static Logger logger = LoggerFactory.getLogger(TimeFcts.class);
public static void addFunctionsTo(NativeFunctions functions)
{
functions.addAll(new NowFunction("now", TimeUUIDType.instance),
new NowFunction("current_timeuuid", TimeUUIDType.instance),
new NowFunction("current_timestamp", TimestampType.instance),
new NowFunction("current_date", SimpleDateType.instance),
new NowFunction("current_time", TimeType.instance),
minTimeuuidFct,
maxTimeuuidFct,
toDate(TimeUUIDType.instance),
toTimestamp(TimeUUIDType.instance),
toUnixTimestamp(TimeUUIDType.instance),
toUnixTimestamp(TimestampType.instance),
toDate(TimestampType.instance),
toUnixTimestamp(SimpleDateType.instance),
toTimestamp(SimpleDateType.instance),
FloorTimestampFunction.newInstance(),
FloorTimestampFunction.newInstanceWithStartTimeArgument(),
FloorTimeUuidFunction.newInstance(),
FloorTimeUuidFunction.newInstanceWithStartTimeArgument(),
FloorDateFunction.newInstance(),
FloorDateFunction.newInstanceWithStartTimeArgument(),
floorTime);
}
private static class NowFunction extends NativeScalarFunction
{
private final TemporalType type;
public NowFunction(String name, TemporalType type)
{
super(name, type);
this.type = type;
}
@Override
public ByteBuffer execute(Arguments arguments)
{
return type.now();
}
@Override
public boolean isPure()
{
return false; // as it returns non-identical results for identical arguments
}
@Override
public NativeFunction withLegacyName()
{
String name = name().name;
return name.contains("current") ? new NowFunction(StringUtils.remove(name, '_'), type) : null;
}
}
public static abstract class TemporalConversionFunction extends NativeScalarFunction
{
protected TemporalConversionFunction(String name, AbstractType returnType, AbstractType... argsType)
{
super(name, returnType, argsType);
}
public ByteBuffer execute(Arguments arguments)
{
beforeExecution();
if (arguments.containsNulls())
return null;
return convertArgument(arguments.getAsLong(0));
}
protected void beforeExecution()
{
}
protected abstract ByteBuffer convertArgument(long timeInMillis);
}
public static final NativeFunction minTimeuuidFct = new MinTimeuuidFunction(false);
private static final class MinTimeuuidFunction extends TemporalConversionFunction
{
public MinTimeuuidFunction(boolean legacy)
{
super(legacy ? "mintimeuuid" : "min_timeuuid", TimeUUIDType.instance, TimestampType.instance);
}
@Override
protected ByteBuffer convertArgument(long timeInMillis)
{
return TimeUUID.minAtUnixMillis(timeInMillis).toBytes();
}
@Override
public NativeFunction withLegacyName()
{
return new MinTimeuuidFunction(true);
}
}
public static final NativeFunction maxTimeuuidFct = new MaxTimeuuidFunction(false);
private static final class MaxTimeuuidFunction extends TemporalConversionFunction
{
public MaxTimeuuidFunction(boolean legacy)
{
super(legacy ? "maxtimeuuid" : "max_timeuuid", TimeUUIDType.instance, TimestampType.instance);
}
@Override
protected ByteBuffer convertArgument(long timeInMillis)
{
return TimeUUID.maxAtUnixMillis(timeInMillis).toBytes();
}
@Override
public NativeFunction withLegacyName()
{
return new MaxTimeuuidFunction(true);
}
}
/**
* Creates a function that converts a value of the specified type into a {@code DATE}.
*
* @param type the temporal type
* @return a function that convert a value of the specified type into a DATE.
*/
public static NativeScalarFunction toDate(TemporalType type)
{
return new ToDateFunction(type, false);
}
private static class ToDateFunction extends TemporalConversionFunction
{
private final TemporalType type;
public ToDateFunction(TemporalType type, boolean useLegacyName)
{
super(useLegacyName ? "todate" : "to_date", SimpleDateType.instance, type);
this.type = type;
}
@Override
protected ByteBuffer convertArgument(long timeInMillis)
{
return SimpleDateType.instance.fromTimeInMillis(timeInMillis);
}
@Override
public boolean isMonotonic()
{
return true;
}
@Override
public NativeFunction withLegacyName()
{
return new ToDateFunction(type, true);
}
}
/**
* Creates a function that converts a value of the specified type into a {@code TIMESTAMP}.
*
* @param type the temporal type
* @return a function that convert a value of the specified type into a {@code TIMESTAMP}.
*/
public static NativeScalarFunction toTimestamp(TemporalType type)
{
return new ToTimestampFunction(type, false);
}
private static class ToTimestampFunction extends TemporalConversionFunction
{
private final TemporalType type;
public ToTimestampFunction(TemporalType type, boolean useLegacyName)
{
super(useLegacyName ? "totimestamp" : "to_timestamp", TimestampType.instance, type);
this.type = type;
}
@Override
protected ByteBuffer convertArgument(long timeInMillis)
{
return TimestampType.instance.fromTimeInMillis(timeInMillis);
}
@Override
public boolean isMonotonic()
{
return true;
}
@Override
public NativeFunction withLegacyName()
{
return new ToTimestampFunction(type, true);
}
}
/**
* Creates a function that converts a value of the specified type into a UNIX timestamp.
*
* @param type the temporal type
* @return a function that convert a value of the specified type into a UNIX timestamp.
*/
public static NativeScalarFunction toUnixTimestamp(TemporalType type)
{
return new ToUnixTimestampFunction(type, false);
}
private static class ToUnixTimestampFunction extends TemporalConversionFunction
{
private final TemporalType type;
private ToUnixTimestampFunction(TemporalType type, boolean useLegacyName)
{
super(useLegacyName ? "tounixtimestamp" : "to_unix_timestamp", LongType.instance, type);
this.type = type;
}
@Override
protected ByteBuffer convertArgument(long timeInMillis)
{
return ByteBufferUtil.bytes(timeInMillis);
}
@Override
public boolean isMonotonic()
{
return true;
}
@Override
public NativeFunction withLegacyName()
{
return new ToUnixTimestampFunction(type, true);
}
}
/**
* Function that rounds a timestamp down to the closest multiple of a duration.
*/
private static abstract class FloorFunction extends NativeScalarFunction
{
private static final Long ZERO = 0L;
protected FloorFunction(AbstractType returnType,
AbstractType... argsType)
{
super("floor", returnType, argsType);
// The function can accept either 2 parameters (time and duration) or 3 parameters (time, duration and startTime)r
assert argsType.length == 2 || argsType.length == 3;
}
@Override
protected boolean isPartialApplicationMonotonic(List partialParameters)
{
return partialParameters.get(0) == UNRESOLVED
&& partialParameters.get(1) != UNRESOLVED
&& (partialParameters.size() == 2 || partialParameters.get(2) != UNRESOLVED);
}
@Override
public final ByteBuffer execute(Arguments arguments)
{
if (arguments.containsNulls())
return null;
long time = arguments.getAsLong(0);
Duration duration = arguments.get(1);
long startingTime = getStartingTime(arguments);
validateDuration(duration);
long floor = Duration.floorTimestamp(time, duration, startingTime);
return fromTimeInMillis(floor);
}
/**
* Returns the time to use as the starting time.
*
* @param arguments the function arguments
* @return the time to use as the starting time
*/
private long getStartingTime(Arguments arguments)
{
if (arguments.size() == 3)
return arguments.getAsLong(2);
return ZERO;
}
/**
* Validates that the duration has the correct precision.
* @param duration the duration to validate.
*/
protected void validateDuration(Duration duration)
{
if (!duration.hasMillisecondPrecision())
throw invalidRequest("The floor cannot be computed for the %s duration as precision is below 1 millisecond", duration);
}
/**
* Serializes the specified time.
*
* @param timeInMillis the time in milliseconds
* @return the serialized time
*/
protected abstract ByteBuffer fromTimeInMillis(long timeInMillis);
}
/**
* Function that rounds a timestamp down to the closest multiple of a duration.
*/
public static final class FloorTimestampFunction extends FloorFunction
{
public static FloorTimestampFunction newInstance()
{
return new FloorTimestampFunction(TimestampType.instance,
TimestampType.instance,
DurationType.instance);
}
public static FloorTimestampFunction newInstanceWithStartTimeArgument()
{
return new FloorTimestampFunction(TimestampType.instance,
TimestampType.instance,
DurationType.instance,
TimestampType.instance);
}
private FloorTimestampFunction(AbstractType returnType,
AbstractType... argTypes)
{
super(returnType, argTypes);
}
protected ByteBuffer fromTimeInMillis(long timeInMillis)
{
return TimestampType.instance.fromTimeInMillis(timeInMillis);
}
}
/**
* Function that rounds a timeUUID down to the closest multiple of a duration.
*/
public static final class FloorTimeUuidFunction extends FloorFunction
{
public static FloorTimeUuidFunction newInstance()
{
return new FloorTimeUuidFunction(TimestampType.instance,
TimeUUIDType.instance,
DurationType.instance);
}
public static FloorTimeUuidFunction newInstanceWithStartTimeArgument()
{
return new FloorTimeUuidFunction(TimestampType.instance,
TimeUUIDType.instance,
DurationType.instance,
TimestampType.instance);
}
private FloorTimeUuidFunction(AbstractType returnType,
AbstractType... argTypes)
{
super(returnType, argTypes);
}
protected ByteBuffer fromTimeInMillis(long timeInMillis)
{
return TimestampType.instance.fromTimeInMillis(timeInMillis);
}
}
/**
* Function that rounds a date down to the closest multiple of a duration.
*/
public static final class FloorDateFunction extends FloorFunction
{
public static FloorDateFunction newInstance()
{
return new FloorDateFunction(SimpleDateType.instance,
SimpleDateType.instance,
DurationType.instance);
}
public static FloorDateFunction newInstanceWithStartTimeArgument()
{
return new FloorDateFunction(SimpleDateType.instance,
SimpleDateType.instance,
DurationType.instance,
SimpleDateType.instance);
}
private FloorDateFunction(AbstractType returnType,
AbstractType... argTypes)
{
super(returnType, argTypes);
}
protected ByteBuffer fromTimeInMillis(long timeInMillis)
{
return SimpleDateType.instance.fromTimeInMillis(timeInMillis);
}
@Override
protected void validateDuration(Duration duration)
{
// Checks that the duration has no data below days.
if (duration.getNanoseconds() != 0)
throw invalidRequest("The floor on %s values cannot be computed for the %s duration as precision is below 1 day",
SimpleDateType.instance.asCQL3Type(), duration);
}
}
/**
* Function that rounds a time down to the closest multiple of a duration.
*/
public static final NativeScalarFunction floorTime = new NativeScalarFunction("floor", TimeType.instance, TimeType.instance, DurationType.instance)
{
@Override
protected boolean isPartialApplicationMonotonic(List partialParameters)
{
return partialParameters.get(0) == UNRESOLVED && partialParameters.get(1) != UNRESOLVED;
}
@Override
public ByteBuffer execute(Arguments arguments)
{
if (arguments.containsNulls())
return null;
long time = arguments.getAsLong(0);
Duration duration = arguments.get(1);
long floor = Duration.floorTime(time, duration);
return TimeType.instance.decompose(floor);
}
};
}
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