Package org.apache.drill.common

Class Typifier

java.lang.Object

org.apache.drill.common.Typifier

public class Typifier
extends Object

This class attempts to infer the data type of an unknown data type. It is somewhat configurable. This was sourced from this code on github.

Constructor Summary

Constructors

Constructor	Description
Typifier()

Method Summary

Modifier and Type	Method	Description
static <T> boolean	contains(T[] target, T source)	Checks if a target array contains the source term.
static boolean	containsAny(CharSequence target, char[] source)
static boolean	containsAny(CharSequence target, CharSequence source)	Returns true if any of the source characters are found in the target.
static LocalDate	stringAsDate(String date)	Helper function that attempts to parse a String as a LocalDateTime.
static LocalDateTime	stringAsDateTime(String date)	Helper function that attempts to parse a String as a LocalDateTime.
static Map.Entry<Class,String>	typify(String data)	Attempts to classify String input as double, int, char, etc.
static Map.Entry<Class,String>	typify(String data, boolean bool01, boolean commonTypes, boolean postfixFL, boolean parseDates)	Attempts to determine the best data type for an unknown bit of text.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Typifier

public Typifier()

Method Details

typify

public static Map.Entry<Class,String> typify(String data)

Attempts to classify String input as double, int, char, etc. Common types are: boolean, double, string, timestamp. This is the default constructor for the simplest use case. The defaults are not to interpet 0,1 as true/false, restrict interpretation to common types, not to allow f/F/l/L postfixes for float and longs and attempts to parse dates.

Parameters:

data - Input string of data

Returns:

An Entry of the Class and the original value

typify

public static Map.Entry<Class,String> typify(String data,
 boolean bool01,
 boolean commonTypes,
 boolean postfixFL,
 boolean parseDates)

Attempts to determine the best data type for an unknown bit of text. This constructor allows you to set a few

Parameters:

data - The unknown data string

bool01 - True, if you want 0/1 to be marked as boolean, false if not

commonTypes - Limit typifier to boolean, double, string, timestamp

postfixFL - Allow typifier to consider f/F/l/L postfixes for float and longs

parseDates - Attempt to parse timestamps

Returns:

An Map.Entry consisting of the object class and the original value as a String

stringAsDateTime

public static LocalDateTime stringAsDateTime(String date)

Helper function that attempts to parse a String as a LocalDateTime. If the string cannot be parsed, return null.

Parameters:

date - Input date string

Returns:

LocalDateTime representation of the input String.

stringAsDate

public static LocalDate stringAsDate(String date)

Helper function that attempts to parse a String as a LocalDateTime. If the string cannot be parsed, return null.

Parameters:

date - Input date string

Returns:

LocalDateTime representation of the input String.

containsAny

public static boolean containsAny(CharSequence target,
 CharSequence source)

Returns true if any of the source characters are found in the target.

Parameters:

target - The target character sequence AKA the haystack.

source - The source characters, AKA the needle

Returns:

True if the needle is in the haystack, false if not

containsAny

public static boolean containsAny(CharSequence target,
 char[] source)

contains

public static <T> boolean contains(T[] target,
 T source)

Checks if a target array contains the source term.

Type Parameters:

T - Unknown class

Parameters:

target - The target array

source - The source term

Returns:

True if the target array contains the source term, false if not