exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/RowGroupReadEntry.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.drill.exec.store.parquet;

import com.fasterxml.jackson.annotation.JsonCreator;
import org.apache.drill.exec.store.dfs.ReadEntryFromHDFS;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.hadoop.fs.Path;

public class RowGroupReadEntry extends ReadEntryFromHDFS {

  private int rowGroupIndex;
  private long numRecordsToRead;

  @JsonCreator
  public RowGroupReadEntry(@JsonProperty("path") Path path, @JsonProperty("start") long start,
                           @JsonProperty("length") long length, @JsonProperty("rowGroupIndex") int rowGroupIndex,
                           @JsonProperty("numRecordsToRead") long numRecordsToRead) {
    super(path, start, length);
    this.rowGroupIndex = rowGroupIndex;
    this.numRecordsToRead = numRecordsToRead;
  }

  @JsonIgnore
  public RowGroupReadEntry getRowGroupReadEntry() {
    return new RowGroupReadEntry(this.getPath(), this.getStart(),
                                 this.getLength(), this.rowGroupIndex, this.numRecordsToRead);
  }

  public int getRowGroupIndex(){
    return rowGroupIndex;
  }

  public long getNumRecordsToRead() { return numRecordsToRead; }

  @JsonIgnore
  public boolean isEmpty() {
    return rowGroupIndex == -1 || numRecordsToRead == 0;
  }
}