tsfile/src/main/java/org/apache/iotdb/tsfile/read/reader/page/VectorPageReader.java

/*
 * 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.iotdb.tsfile.read.reader.page;

import org.apache.iotdb.tsfile.encoding.decoder.Decoder;
import org.apache.iotdb.tsfile.file.header.PageHeader;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics;
import org.apache.iotdb.tsfile.read.common.BatchData;
import org.apache.iotdb.tsfile.read.common.BatchDataFactory;
import org.apache.iotdb.tsfile.read.common.TimeRange;
import org.apache.iotdb.tsfile.read.filter.basic.Filter;
import org.apache.iotdb.tsfile.read.reader.IPageReader;
import org.apache.iotdb.tsfile.utils.TsPrimitiveType;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;

public class VectorPageReader implements IPageReader {

  private final TimePageReader timePageReader;
  private final List<ValuePageReader> valuePageReaderList;
  private final int valueCount;
  private Filter filter;
  private boolean isModified;

  public VectorPageReader(
      PageHeader timePageHeader,
      ByteBuffer timePageData,
      Decoder timeDecoder,
      List<PageHeader> valuePageHeaderList,
      List<ByteBuffer> valuePageDataList,
      List<TSDataType> valueDataTypeList,
      List<Decoder> valueDecoderList,
      Filter filter) {
    timePageReader = new TimePageReader(timePageHeader, timePageData, timeDecoder);
    isModified = timePageReader.isModified();
    valuePageReaderList = new ArrayList<>(valuePageHeaderList.size());
    for (int i = 0; i < valuePageHeaderList.size(); i++) {
      ValuePageReader valuePageReader =
          new ValuePageReader(
              valuePageHeaderList.get(i),
              valuePageDataList.get(i),
              valueDataTypeList.get(i),
              valueDecoderList.get(i));
      valuePageReaderList.add(valuePageReader);
      isModified = isModified && valuePageReader.isModified();
    }
    this.filter = filter;
    this.valueCount = valuePageReaderList.size();
  }

  @Override
  public BatchData getAllSatisfiedPageData(boolean ascending) throws IOException {
    long[] timeBatch = timePageReader.nexTimeBatch();
    if (valuePageReaderList.size() == 1) {
      return valuePageReaderList.get(0).nextBatch(timeBatch, ascending, filter);
    }
    List<TsPrimitiveType[]> valueBatchList = new ArrayList<>(valueCount);
    for (ValuePageReader valuePageReader : valuePageReaderList) {
      valueBatchList.add(valuePageReader.nextValueBatch(timeBatch));
    }
    BatchData pageData = BatchDataFactory.createBatchData(TSDataType.VECTOR, ascending, false);
    boolean isNull;
    for (int i = 0; i < timeBatch.length; i++) {
      isNull = true;
      TsPrimitiveType[] v = new TsPrimitiveType[valueCount];
      for (int j = 0; j < v.length; j++) {
        v[j] = valueBatchList.get(j)[i];
        if (v[j] != null) {
          isNull = false;
        }
      }
      // TODO fix value filter v[0].getValue()
      if (!isNull && (filter == null || filter.satisfy(timeBatch[i], v[0].getValue()))) {
        pageData.putVector(timeBatch[i], v);
      }
    }
    return pageData;
  }

  public void setDeleteIntervalList(List<List<TimeRange>> list) {
    for (int i = 0; i < valueCount; i++) {
      valuePageReaderList.get(i).setDeleteIntervalList(list.get(i));
    }
  }

  @Override
  public Statistics getStatistics() {
    return valuePageReaderList.size() == 1
        ? valuePageReaderList.get(0).getStatistics()
        : timePageReader.getStatistics();
  }

  @Override
  public void setFilter(Filter filter) {
    this.filter = filter;
  }

  @Override
  public boolean isModified() {
    return isModified;
  }
}