parquet-column/src/main/java/org/apache/parquet/column/values/rle/ZeroIntegerValuesReader.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.parquet.column.values.rle;

import java.io.IOException;
import java.nio.ByteBuffer;

import org.apache.parquet.column.values.ValuesReader;

/**
 * ColumnReader which does not read any actual data, but rather simply produces
 * an endless stream of constant values.
 * Mainly used to read definition levels when the only possible value is 0
 */
public class ZeroIntegerValuesReader extends ValuesReader {
  
  private int nextOffset;

  public int readInteger() {
    return 0;
  }

  @Override
  public void initFromPage(int valueCount, ByteBuffer in, int offset) throws IOException {
    this.nextOffset = offset;
  }
  
  @Override
  public int getNextOffset() {
    return nextOffset;
  }

  @Override
  public void skip() {
  }

}