io.cdap.wrangler.dq

Class TypeInference

java.lang.Object

io.cdap.wrangler.dq.TypeInference

public class TypeInference
extends Object

Type Interface provides utility functions that allow you to detect the types of data.

Constructor Summary

Constructors

Constructor and Description
TypeInference()

Method Summary

Modifier and Type	Method and Description
static BigInteger	getBigInteger(String value) Get big integer from a string.
static DataType	getDataType(String value)
static boolean	isBoolean(String value) Detect if the given value is a boolean type.
static boolean	isDate(String value) Detect if the given value is a date type.
static boolean	isDouble(String value) Detect if the given value is a double type.
static boolean	isEmpty(String value) Detect if the given value is blank or null.
static boolean	isInteger(String value) Detect if the given value is a integer type.
static boolean	isNumber(String value)
static boolean	isTime(String value) Detect if the given value is a time type.
static boolean	isValid(DataType type, String value)

Methods inherited from class java.lang.Object

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

Constructor Detail

TypeInference

public TypeInference()

Method Detail

isDouble

public static boolean isDouble(String value)

Detect if the given value is a double type.

Note:
1. This method support only English locale.
e.g. TypeInference.isDouble("3.4") returns true.
e.g. TypeInference.isDouble("3,4") returns false.
2. Exponential notation can be detected as a valid double.
e.g. TypeInference.isDouble("1.0E+4") returns true.
e.g. TypeInference.isDouble("1.0e-4") returns true.
e.g. TypeInference.isDouble("1.0e-04") returns true.
3. Numbers marked with a type is invalid.
e.g. TypeInference.isDouble("3.4d") returns false.
e.g. TypeInference.isDouble("123L") returns false.
4. White space is invalid.
e.g. TypeInference.isDouble(" 3.4") returns false.
e.g. TypeInference.isDouble("3.4 ") returns false.
5. "." is not obligatory.
e.g. TypeInference.isDouble("100") returns true.

Parameters:

value - the value to be detected.

Returns:

true if the value is a double type, false otherwise.

isInteger

public static boolean isInteger(String value)

Detect if the given value is a integer type.

Parameters:

value - the value to be detected.

Returns:

true if the value is a integer type, false otherwise.

isNumber

public static boolean isNumber(String value)

getBigInteger

public static BigInteger getBigInteger(String value)

Get big integer from a string.

Parameters:

value -

Returns:

big integer instance , or null if numer format exception occurrs.

isBoolean

public static boolean isBoolean(String value)

Detect if the given value is a boolean type.

Parameters:

value - the value to be detected.

Returns:

true if the value is a boolean type, false otherwise.

isDate

public static boolean isDate(String value)

Detect if the given value is a date type.

Parameters:

value - the value to be detected.

Returns:

true if the value is a date type, false otherwise.

isTime

public static boolean isTime(String value)

Detect if the given value is a time type.

Parameters:

value -

Returns:

isEmpty

public static boolean isEmpty(String value)

Detect if the given value is blank or null.

Parameters:

value - the value to be detected.

Returns:

true if the value is blank or null, false otherwise.

isValid

public static boolean isValid(DataType type,
                              String value)

Parameters:

type - the expected type

value - the value to be detected

Returns:

true if the type of value is expected, false otherwise.

getDataType

public static DataType getDataType(String value)