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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.expression;
import com.yahoo.vespa.objects.Deserializer;
import com.yahoo.vespa.objects.ObjectVisitor;
import com.yahoo.vespa.objects.Serializer;
/**
* <p>This function assign a fixed width bucket to each input value.</p>
*
* @author <a href="mailto:havardpe@yahoo-inc.com">Haavard Pettersen</a>
* @author Simon Thoresen Hult
*/
public class TimeStampFunctionNode extends UnaryFunctionNode {
public static enum TimePart {
Year(0),
Month(1),
MonthDay(2),
WeekDay(3),
Hour(4),
Minute(5),
Second(6),
YearDay(7),
IsDST(8);
private final int id;
private TimePart(int id) {
this.id = id;
}
private static TimePart valueOf(int id) {
for (TimePart part : values()) {
if (id == part.id) {
return part;
}
}
return null;
}
}
public static final int classId = registerClass(0x4000 + 75, TimeStampFunctionNode.class, TimeStampFunctionNode::new);
private TimePart timePart = TimePart.Year;
private boolean isGmt = false;
public TimeStampFunctionNode() {}
/**
* <p>Create a bucket expression with the given width and the given subexpression.</p>
*
* @param arg The argument for this function.
* @param part The part of time to retrieve.
* @param gmt Whether or not to treat time as GMT.
*/
public TimeStampFunctionNode(ExpressionNode arg, TimePart part, boolean gmt) {
addArg(arg);
timePart = part;
isGmt = gmt;
}
public TimePart getTimePart() {
return timePart;
}
public boolean isGmt() {
return isGmt;
}
public boolean isLocal() {
return !isGmt;
}
@Override
protected int onGetClassId() {
return classId;
}
@Override
protected void onSerialize(Serializer buf) {
super.onSerialize(buf);
buf.putByte(null, (byte)(timePart.id | (isGmt ? 0x80 : 0)));
}
@Override
protected void onDeserialize(Deserializer buf) {
super.onDeserialize(buf);
int b = buf.getByte(null);
timePart = TimePart.valueOf(b & 0x7f);
isGmt = (b & 0x80) != 0;
}
@Override
protected boolean equalsUnaryFunction(UnaryFunctionNode obj) {
TimeStampFunctionNode rhs = (TimeStampFunctionNode)obj;
return timePart == rhs.timePart && isGmt == rhs.isGmt;
}
@Override
public TimeStampFunctionNode clone() {
TimeStampFunctionNode obj = (TimeStampFunctionNode)super.clone();
obj.timePart = timePart;
obj.isGmt = isGmt;
return obj;
}
@Override
public void visitMembers(ObjectVisitor visitor) {
super.visitMembers(visitor);
visitor.visit("timepart", timePart);
visitor.visit("islocal", isGmt);
}
}
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