Package app.babylon.table.transform

Class DateFormatInference

java.lang.Object

app.babylon.table.transform.DateFormatInference

public final class DateFormatInference
extends Object

Heuristics for inferring a consistent date format from string columns.

Method Summary

Modifier and Type	Method	Description
static DateFormat	inferFormat(ColumnObject<String> column)	Infers the best date format for one string column.
static DateFormat[]	inferFormats(ColumnObject<String>[] columns)	Infers one date format per supplied column, optionally using a dominant format to fill ambiguous columns.
static boolean	isLikelyDate(CharSequence value)	Returns whether the value looks like any recognised date.
static boolean	isLikelyDate(CharSequence value, boolean isDateName)	Returns whether the value looks date-like, optionally biasing toward date interpretation when the column name suggests it contains dates.
static boolean	isStrictDecimal(CharSequence value)	Returns whether the value is a strict decimal literal.
static boolean	isStrictInteger(CharSequence value)	Returns whether the value is a strict integer literal.
static Collection<DateFormat>	validFormats(CharSequence value, boolean isDateName, Collection<DateFormat> result)	Adds all date formats that can parse the supplied value to the result collection.
static Collection<DateFormat>	validFormats(CharSequence value, Collection<DateFormat> result)	Adds all date formats that can parse the supplied value to the result collection.

Methods inherited from class java.lang.Object

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

Method Details

inferFormats

public static DateFormat[] inferFormats(ColumnObject<String>[] columns)

Infers one date format per supplied column, optionally using a dominant format to fill ambiguous columns.

Parameters:

columns - string columns to inspect

Returns:

inferred formats, never null

inferFormat

public static DateFormat inferFormat(ColumnObject<String> column)

Infers the best date format for one string column.

Parameters:

column - string column to inspect

Returns:

inferred format or DateFormat.Unknown

isLikelyDate

public static boolean isLikelyDate(CharSequence value)

Returns whether the value looks like any recognised date.

Parameters:

value - text to inspect

Returns:

true when the value looks date-like

isLikelyDate

public static boolean isLikelyDate(CharSequence value,
 boolean isDateName)

Returns whether the value looks date-like, optionally biasing toward date interpretation when the column name suggests it contains dates.

Parameters:

value - text to inspect

isDateName - whether the surrounding column name suggests date content

Returns:

true when the value looks date-like

validFormats

public static Collection<DateFormat> validFormats(CharSequence value,
 Collection<DateFormat> result)

Adds all date formats that can parse the supplied value to the result collection.

Parameters:

value - text to inspect

result - collection to append to, or null to create an EnumSet

Returns:

the supplied result collection, or a new EnumSet when result was null

validFormats

public static Collection<DateFormat> validFormats(CharSequence value,
 boolean isDateName,
 Collection<DateFormat> result)

Adds all date formats that can parse the supplied value to the result collection.

Parameters:

value - text to inspect

isDateName - whether the surrounding column name suggests date content

result - collection to append to, or null to create an EnumSet

Returns:

the supplied result collection, or a new EnumSet when result was null

isStrictInteger

public static boolean isStrictInteger(CharSequence value)

Returns whether the value is a strict integer literal.

Parameters:

value - text to inspect

Returns:

true when the value is a strict integer

isStrictDecimal

public static boolean isStrictDecimal(CharSequence value)

Returns whether the value is a strict decimal literal.

Parameters:

value - text to inspect

Returns:

true when the value is a strict decimal