java.lang.Object
- java.lang.Enum<PageHeader._Fields>
- - org.apache.parquet.format.PageHeader._Fields

All Implemented Interfaces:

Serializable, Comparable<PageHeader._Fields>, org.apache.thrift.TFieldIdEnum

Enclosing class:

PageHeader
```
public static enum PageHeader._Fields
extends Enum<PageHeader._Fields>
implements org.apache.thrift.TFieldIdEnum
```
The set of fields this struct contains, along with convenience methods for finding and manipulating them.

Enum Constant Summary

Enum Constants
Enum Constant	Description
`COMPRESSED_PAGE_SIZE`	Compressed (and potentially encrypted) page size in bytes, not including this header *
`CRC`	The 32-bit CRC checksum for the page, to be be calculated as follows: - The standard CRC32 algorithm is used (with polynomial 0x04C11DB7, the same as in e.g.
`DATA_PAGE_HEADER`
`DATA_PAGE_HEADER_V2`
`DICTIONARY_PAGE_HEADER`
`INDEX_PAGE_HEADER`
`TYPE`	the type of the page: indicates which of the _header fields is set
`UNCOMPRESSED_PAGE_SIZE`	Uncompressed page size in bytes (not including this header) *

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static PageHeader._Fields`	`findByName(String name)`	Find the _Fields constant that matches name, or null if its not found.
`static PageHeader._Fields`	`findByThriftId(int fieldId)`	Find the _Fields constant that matches fieldId, or null if its not found.
`static PageHeader._Fields`	`findByThriftIdOrThrow(int fieldId)`	Find the _Fields constant that matches fieldId, throwing an exception if it is not found.
`String`	`getFieldName()`
`short`	`getThriftFieldId()`
`static PageHeader._Fields`	`valueOf(String name)`	Returns the enum constant of this type with the specified name.
`static PageHeader._Fields[]`	`values()`	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - TYPE
```
public static final PageHeader._Fields TYPE
```
    the type of the page: indicates which of the *_header fields is set *
    
    See Also:
    
    PageType
  - UNCOMPRESSED_PAGE_SIZE
```
public static final PageHeader._Fields UNCOMPRESSED_PAGE_SIZE
```
    Uncompressed page size in bytes (not including this header) *
  - COMPRESSED_PAGE_SIZE
```
public static final PageHeader._Fields COMPRESSED_PAGE_SIZE
```
    Compressed (and potentially encrypted) page size in bytes, not including this header *
  - CRC
```
public static final PageHeader._Fields CRC
```
    The 32-bit CRC checksum for the page, to be be calculated as follows: - The standard CRC32 algorithm is used (with polynomial 0x04C11DB7, the same as in e.g. GZip). - All page types can have a CRC (v1 and v2 data pages, dictionary pages, etc.). - The CRC is computed on the serialization binary representation of the page (as written to disk), excluding the page header. For example, for v1 data pages, the CRC is computed on the concatenation of repetition levels, definition levels and column values (optionally compressed, optionally encrypted). - The CRC computation therefore takes place after any compression and encryption steps, if any. If enabled, this allows for disabling checksumming in HDFS if only a few pages need to be read.
  - DATA_PAGE_HEADER
```
public static final PageHeader._Fields DATA_PAGE_HEADER
```
  - INDEX_PAGE_HEADER
```
public static final PageHeader._Fields INDEX_PAGE_HEADER
```
  - DICTIONARY_PAGE_HEADER
```
public static final PageHeader._Fields DICTIONARY_PAGE_HEADER
```
  - DATA_PAGE_HEADER_V2
```
public static final PageHeader._Fields DATA_PAGE_HEADER_V2
```
- Method Detail
  - values
```
public static PageHeader._Fields[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
    for (PageHeader._Fields c : PageHeader._Fields.values()) System.out.println(c);
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static PageHeader._Fields valueOf(String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    IllegalArgumentException - if this enum type has no constant with the specified name
    
    NullPointerException - if the argument is null
  - findByThriftId
```
public static PageHeader._Fields findByThriftId(int fieldId)
```
    Find the _Fields constant that matches fieldId, or null if its not found.
  - findByThriftIdOrThrow
```
public static PageHeader._Fields findByThriftIdOrThrow(int fieldId)
```
    Find the _Fields constant that matches fieldId, throwing an exception if it is not found.
  - findByName
```
public static PageHeader._Fields findByName(String name)
```
    Find the _Fields constant that matches name, or null if its not found.
  - getThriftFieldId
```
public short getThriftFieldId()
```
    Specified by:
    
    getThriftFieldId in interface org.apache.thrift.TFieldIdEnum
  - getFieldName
```
public String getFieldName()
```
    Specified by:
    
    getFieldName in interface org.apache.thrift.TFieldIdEnum

Enum PageHeader._Fields

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

TYPE

UNCOMPRESSED_PAGE_SIZE

COMPRESSED_PAGE_SIZE

CRC

DATA_PAGE_HEADER

INDEX_PAGE_HEADER

DICTIONARY_PAGE_HEADER

DATA_PAGE_HEADER_V2

Method Detail

values

valueOf

findByThriftId

findByThriftIdOrThrow

findByName

getThriftFieldId

getFieldName