io.questdb.griffin.engine.table.HeapRowCursorFactory Maven / Gradle / Ivy

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 *  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,
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package io.questdb.griffin.engine.table;

import io.questdb.cairo.TableReader;
import io.questdb.cairo.sql.DataFrame;
import io.questdb.cairo.sql.RowCursor;
import io.questdb.cairo.sql.RowCursorFactory;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.std.ObjList;

public class HeapRowCursorFactory implements RowCursorFactory {
    private final ObjList cursorFactories;
    private final ObjList cursors;
    private final HeapRowCursor cursor;

    public HeapRowCursorFactory(ObjList cursorFactories) {
        this.cursorFactories = cursorFactories;
        this.cursors = new ObjList<>();
        this.cursor = new HeapRowCursor();
    }

    @Override
    public boolean isEntity() {
        return false;
    }

    @Override
    public RowCursor getCursor(DataFrame dataFrame) {
        for (int i = 0, n = cursorFactories.size(); i < n; i++) {
            cursors.extendAndSet(i, cursorFactories.getQuick(i).getCursor(dataFrame));
        }
        cursor.of(cursors);
        return cursor;
    }

    @Override
    public void prepareCursor(TableReader tableReader, SqlExecutionContext sqlExecutionContext) {
        RowCursorFactory.prepareCursor(cursorFactories, tableReader, sqlExecutionContext);
    }
}