org.apache.iceberg.parquet.ColumnIterator Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of iceberg-parquet Show documentation
A table format for huge analytic datasets
There is a newer version: 1.0.0.8
/*
 * 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.iceberg.parquet;

import org.apache.parquet.column.ColumnDescriptor;
import org.apache.parquet.io.api.Binary;

public abstract class ColumnIterator extends BaseColumnIterator implements TripleIterator {
  @SuppressWarnings("unchecked")
  static  ColumnIterator newIterator(ColumnDescriptor desc, String writerVersion) {
    switch (desc.getPrimitiveType().getPrimitiveTypeName()) {
      case BOOLEAN:
        return (ColumnIterator) new ColumnIterator(desc, writerVersion) {
          @Override
          public Boolean next() {
            return nextBoolean();
          }
        };
      case INT32:
        return (ColumnIterator) new ColumnIterator(desc, writerVersion) {
          @Override
          public Integer next() {
            return nextInteger();
          }
        };
      case INT64:
        return (ColumnIterator) new ColumnIterator(desc, writerVersion) {
          @Override
          public Long next() {
            return nextLong();
          }
        };
      case INT96:
        return (ColumnIterator) new ColumnIterator(desc, writerVersion) {
          @Override
          public Binary next() {
            return nextBinary();
          }
        };
      case FLOAT:
        return (ColumnIterator) new ColumnIterator(desc, writerVersion) {
          @Override
          public Float next() {
            return nextFloat();
          }
        };
      case DOUBLE:
        return (ColumnIterator) new ColumnIterator(desc, writerVersion) {
          @Override
          public Double next() {
            return nextDouble();
          }
        };
      case FIXED_LEN_BYTE_ARRAY:
      case BINARY:
        return (ColumnIterator) new ColumnIterator(desc, writerVersion) {
          @Override
          public Binary next() {
            return nextBinary();
          }
        };
      default:
        throw new UnsupportedOperationException("Unsupported primitive type: " +
            desc.getPrimitiveType().getPrimitiveTypeName());
    }
  }

  private final PageIterator pageIterator;

  private ColumnIterator(ColumnDescriptor desc, String writerVersion) {
    super(desc);
    this.pageIterator = PageIterator.newIterator(desc, writerVersion);
  }

  @Override
  public int currentDefinitionLevel() {
    advance();
    return pageIterator.currentDefinitionLevel();
  }

  @Override
  public int currentRepetitionLevel() {
    advance();
    return pageIterator.currentRepetitionLevel();
  }

  @Override
  public boolean nextBoolean() {
    this.triplesRead += 1;
    advance();
    return pageIterator.nextBoolean();
  }

  @Override
  public int nextInteger() {
    this.triplesRead += 1;
    advance();
    return pageIterator.nextInteger();
  }

  @Override
  public long nextLong() {
    this.triplesRead += 1;
    advance();
    return pageIterator.nextLong();
  }

  @Override
  public float nextFloat() {
    this.triplesRead += 1;
    advance();
    return pageIterator.nextFloat();
  }

  @Override
  public double nextDouble() {
    this.triplesRead += 1;
    advance();
    return pageIterator.nextDouble();
  }

  @Override
  public Binary nextBinary() {
    this.triplesRead += 1;
    advance();
    return pageIterator.nextBinary();
  }

  @Override
  public  N nextNull() {
    this.triplesRead += 1;
    advance();
    return pageIterator.nextNull();
  }

  @Override
  protected BasePageIterator pageIterator() {
    return pageIterator;
  }

}