io.questdb.cairo.FullBwdDataFrameCursor Maven / Gradle / Ivy
/*******************************************************************************
* ___ _ ____ ____
* / _ \ _ _ ___ ___| |_| _ \| __ )
* | | | | | | |/ _ \/ __| __| | | | _ \
* | |_| | |_| | __/\__ \ |_| |_| | |_) |
* \__\_\\__,_|\___||___/\__|____/|____/
*
* Copyright (c) 2014-2019 Appsicle
* Copyright (c) 2019-2020 QuestDB
*
* Licensed 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 io.questdb.cairo;
import io.questdb.cairo.sql.DataFrame;
public class FullBwdDataFrameCursor extends AbstractFullDataFrameCursor {
@Override
public DataFrame next() {
while (this.partitionIndex > -1) {
final long hi = reader.openPartition(partitionIndex);
if (hi < 1) {
// this partition is missing, skip
partitionIndex--;
} else {
frame.partitionIndex = partitionIndex;
frame.rowHi = hi;
partitionIndex--;
return frame;
}
}
return null;
}
@Override
public void toTop() {
this.partitionIndex = this.partitionHi - 1;
}
}