org.h2.expression.aggregate.AggregateDataCount Maven / Gradle / Ivy
/*
* Copyright 2004-2019 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.expression.aggregate;
import org.h2.engine.Database;
import org.h2.value.Value;
import org.h2.value.ValueLong;
import org.h2.value.ValueNull;
/**
* Data stored while calculating a COUNT aggregate.
*/
class AggregateDataCount extends AggregateData {
private final boolean all;
private long count;
AggregateDataCount(boolean all) {
this.all = all;
}
@Override
void add(Database database, Value v) {
if (all || v != ValueNull.INSTANCE) {
count++;
}
}
@Override
Value getValue(Database database, int dataType) {
return ValueLong.get(count).convertTo(dataType);
}
}