import quincy 17.2.0

[ceph.git] / ceph / src / arrow / java / vector / src / main / java / org / apache / arrow / vector / IntervalYearVector.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.arrow.vector;

import static org.apache.arrow.vector.NullCheckingForGet.NULL_CHECKING_ENABLED;

import java.time.Period;

import org.apache.arrow.memory.ArrowBuf;
import org.apache.arrow.memory.BufferAllocator;
import org.apache.arrow.vector.complex.impl.IntervalYearReaderImpl;
import org.apache.arrow.vector.complex.reader.FieldReader;
import org.apache.arrow.vector.holders.IntervalYearHolder;
import org.apache.arrow.vector.holders.NullableIntervalYearHolder;
import org.apache.arrow.vector.types.Types.MinorType;
import org.apache.arrow.vector.types.pojo.Field;
import org.apache.arrow.vector.types.pojo.FieldType;
import org.apache.arrow.vector.util.TransferPair;

/**
 * IntervalYearVector implements a fixed width (4 bytes) vector of
 * interval (years and months) values which could be null. A validity buffer
 * (bit vector) is maintained to track which elements in the vector are null.
 */
public final class IntervalYearVector extends BaseFixedWidthVector {
  public static final byte TYPE_WIDTH = 4;
  private final FieldReader reader;

  /**
   * Instantiate a IntervalYearVector. This doesn't allocate any memory for
   * the data in vector.
   *
   * @param name name of the vector
   * @param allocator allocator for memory management.
   */
  public IntervalYearVector(String name, BufferAllocator allocator) {
    this(name, FieldType.nullable(MinorType.INTERVALYEAR.getType()), allocator);
  }

  /**
   * Instantiate a IntervalYearVector. This doesn't allocate any memory for
   * the data in vector.
   *
   * @param name name of the vector
   * @param fieldType type of Field materialized by this vector
   * @param allocator allocator for memory management.
   */
  public IntervalYearVector(String name, FieldType fieldType, BufferAllocator allocator) {
    this(new Field(name, fieldType, null), allocator);
  }

  /**
   * Instantiate a IntervalYearVector. This doesn't allocate any memory for
   * the data in vector.
   *
   * @param field field materialized by this vector
   * @param allocator allocator for memory management.
   */
  public IntervalYearVector(Field field, BufferAllocator allocator) {
    super(field, allocator, TYPE_WIDTH);
    reader = new IntervalYearReaderImpl(IntervalYearVector.this);
  }

  /**
   * Get a reader that supports reading values from this vector.
   *
   * @return Field Reader for this vector
   */
  @Override
  public FieldReader getReader() {
    return reader;
  }

  /**
   * Get minor type for this vector. The vector holds values belonging
   * to a particular type.
   *
   * @return {@link org.apache.arrow.vector.types.Types.MinorType}
   */
  @Override
  public MinorType getMinorType() {
    return MinorType.INTERVALYEAR;
  }


  /*----------------------------------------------------------------*
   |                                                                |
   |          vector value retrieval methods                        |
   |                                                                |
   *----------------------------------------------------------------*/


  /**
   * Given a data buffer, get the value stored at a particular position
   * in the vector.
   *
   * <p>This method should not be used externally.
   *
   * @param buffer data buffer
   * @param index  position of the element.
   * @return value stored at the index.
   */
  public static int getTotalMonths(final ArrowBuf buffer, final int index) {
    return buffer.getInt((long) index * TYPE_WIDTH);
  }

  /**
   * Get the element at the given index from the vector.
   *
   * @param index   position of element
   * @return element at given index
   */
  public int get(int index) throws IllegalStateException {
    if (NULL_CHECKING_ENABLED && isSet(index) == 0) {
      throw new IllegalStateException("Value at index is null");
    }
    return valueBuffer.getInt((long) index * TYPE_WIDTH);
  }

  /**
   * Get the element at the given index from the vector and
   * sets the state in holder. If element at given index
   * is null, holder.isSet will be zero.
   *
   * @param index   position of element
   */
  public void get(int index, NullableIntervalYearHolder holder) {
    if (isSet(index) == 0) {
      holder.isSet = 0;
      return;
    }
    holder.isSet = 1;
    holder.value = valueBuffer.getInt((long) index * TYPE_WIDTH);
  }

  /**
   * Same as {@link #get(int)}.
   *
   * @param index   position of element
   * @return element at given index
   */
  public Period getObject(int index) {
    if (isSet(index) == 0) {
      return null;
    } else {
      final int interval = valueBuffer.getInt((long) index * TYPE_WIDTH);
      // TODO: verify interval is in months
      return Period.ofMonths(interval);
    }
  }

  /**
   * Get the Interval value at a given index as a {@link StringBuilder} object.
   *
   * @param index position of the element
   * @return String Builder object with Interval value as
   *         [years, months]
   */
  public StringBuilder getAsStringBuilder(int index) {
    if (isSet(index) == 0) {
      return null;
    } else {
      return getAsStringBuilderHelper(index);
    }
  }

  private StringBuilder getAsStringBuilderHelper(int index) {
    int value = valueBuffer.getInt((long) index * TYPE_WIDTH);

    final int years = (value / org.apache.arrow.vector.util.DateUtility.yearsToMonths);
    final int months = (value % org.apache.arrow.vector.util.DateUtility.yearsToMonths);

    final String yearString = (Math.abs(years) == 1) ? " year " : " years ";
    final String monthString = (Math.abs(months) == 1) ? " month " : " months ";

    return (new StringBuilder()
        .append(years)
        .append(yearString)
        .append(months)
        .append(monthString));
  }

  /*----------------------------------------------------------------*
   |                                                                |
   |          vector value setter methods                           |
   |                                                                |
   *----------------------------------------------------------------*/


  private void setValue(int index, int value) {
    valueBuffer.setInt((long) index * TYPE_WIDTH, value);
  }

  /**
   * Set the element at the given index to the given value.
   *
   * @param index   position of element
   * @param value   value of element
   */
  public void set(int index, int value) {
    BitVectorHelper.setBit(validityBuffer, index);
    setValue(index, value);
  }

  /**
   * Set the element at the given index to the value set in data holder.
   * If the value in holder is not indicated as set, element in the
   * at the given index will be null.
   *
   * @param index   position of element
   * @param holder  nullable data holder for value of element
   */
  public void set(int index, NullableIntervalYearHolder holder) throws IllegalArgumentException {
    if (holder.isSet < 0) {
      throw new IllegalArgumentException();
    } else if (holder.isSet > 0) {
      BitVectorHelper.setBit(validityBuffer, index);
      setValue(index, holder.value);
    } else {
      BitVectorHelper.unsetBit(validityBuffer, index);
    }
  }

  /**
   * Set the element at the given index to the value set in data holder.
   *
   * @param index   position of element
   * @param holder  data holder for value of element
   */
  public void set(int index, IntervalYearHolder holder) {
    BitVectorHelper.setBit(validityBuffer, index);
    setValue(index, holder.value);
  }

  /**
   * Same as {@link #set(int, int)} except that it handles the
   * case when index is greater than or equal to existing
   * value capacity {@link #getValueCapacity()}.
   *
   * @param index   position of element
   * @param value   value of element
   */
  public void setSafe(int index, int value) {
    handleSafe(index);
    set(index, value);
  }

  /**
   * Same as {@link #set(int, NullableIntervalYearHolder)} except that it handles the
   * case when index is greater than or equal to existing
   * value capacity {@link #getValueCapacity()}.
   *
   * @param index   position of element
   * @param holder  nullable data holder for value of element
   */
  public void setSafe(int index, NullableIntervalYearHolder holder) throws IllegalArgumentException {
    handleSafe(index);
    set(index, holder);
  }

  /**
   * Same as {@link #set(int, IntervalYearHolder)} except that it handles the
   * case when index is greater than or equal to existing
   * value capacity {@link #getValueCapacity()}.
   *
   * @param index   position of element
   * @param holder  data holder for value of element
   */
  public void setSafe(int index, IntervalYearHolder holder) {
    handleSafe(index);
    set(index, holder);
  }

  /**
   * Store the given value at a particular position in the vector. isSet indicates
   * whether the value is NULL or not.
   *
   * @param index position of the new value
   * @param isSet 0 for NULL value, 1 otherwise
   * @param value element value
   */
  public void set(int index, int isSet, int value) {
    if (isSet > 0) {
      set(index, value);
    } else {
      BitVectorHelper.unsetBit(validityBuffer, index);
    }
  }

  /**
   * Same as {@link #set(int, int, int)} except that it handles the case
   * when index is greater than or equal to current value capacity of the
   * vector.
   *
   * @param index position of the new value
   * @param isSet 0 for NULL value, 1 otherwise
   * @param value element value
   */
  public void setSafe(int index, int isSet, int value) {
    handleSafe(index);
    set(index, isSet, value);
  }


  /*----------------------------------------------------------------*
   |                                                                |
   |                      vector transfer                           |
   |                                                                |
   *----------------------------------------------------------------*/


  /**
   * Construct a TransferPair comprising of this and a target vector of
   * the same type.
   *
   * @param ref name of the target vector
   * @param allocator allocator for the target vector
   * @return {@link TransferPair}
   */
  @Override
  public TransferPair getTransferPair(String ref, BufferAllocator allocator) {
    return new TransferImpl(ref, allocator);
  }

  /**
   * Construct a TransferPair with a desired target vector of the same type.
   *
   * @param to target vector
   * @return {@link TransferPair}
   */
  @Override
  public TransferPair makeTransferPair(ValueVector to) {
    return new TransferImpl((IntervalYearVector) to);
  }

  private class TransferImpl implements TransferPair {
    IntervalYearVector to;

    public TransferImpl(String ref, BufferAllocator allocator) {
      to = new IntervalYearVector(ref, field.getFieldType(), allocator);
    }

    public TransferImpl(IntervalYearVector to) {
      this.to = to;
    }

    @Override
    public IntervalYearVector getTo() {
      return to;
    }

    @Override
    public void transfer() {
      transferTo(to);
    }

    @Override
    public void splitAndTransfer(int startIndex, int length) {
      splitAndTransferTo(startIndex, length, to);
    }

    @Override
    public void copyValueSafe(int fromIndex, int toIndex) {
      to.copyFromSafe(fromIndex, toIndex, IntervalYearVector.this);
    }
  }
}