java.lang.Object
- org.apache.flink.table.types.logical.utils.LogicalTypeChecks

```
@Internal
public final class LogicalTypeChecks
extends Object
```
Utilities for checking LogicalType and avoiding a lot of type casting and repetitive work.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static boolean`	`areComparable(LogicalType firstType, LogicalType secondType, StructuredType.StructuredComparison requiredComparison)`
`static boolean`	`canBeTimeAttributeType(LogicalType logicalType)`
`static int`	`getDayPrecision(LogicalType logicalType)`
`static int`	`getFieldCount(LogicalType logicalType)`	Returns the field count of row and structured types.
`static List<String>`	`getFieldNames(LogicalType logicalType)`	Returns the field names of row and structured types.
`static List<LogicalType>`	`getFieldTypes(LogicalType logicalType)`	Returns the field types of row and structured types.
`static int`	`getFractionalPrecision(LogicalType logicalType)`
`static int`	`getLength(LogicalType logicalType)`
`static int`	`getPrecision(LogicalType logicalType)`	Returns the precision of all types that define a precision implicitly or explicitly.
`static int`	`getScale(LogicalType logicalType)`	Returns the scale of all types that define a scale implicitly or explicitly.
`static int`	`getYearPrecision(LogicalType logicalType)`
`static boolean`	`hasDayPrecision(LogicalType logicalType, int yearPrecision)`
`static boolean`	`hasFractionalPrecision(LogicalType logicalType, int fractionalPrecision)`
`static boolean`	`hasLegacyTypes(LogicalType logicalType)`	Checks whether a (possibly nested) logical type contains `LegacyTypeInformationType` or `TypeInformationRawType`.
`static boolean`	`hasLength(LogicalType logicalType, int length)`
`static boolean`	`hasNested(LogicalType logicalType, Predicate<LogicalType> predicate)`	Checks whether a (possibly nested) logical type fulfills the given predicate.
`static boolean`	`hasPrecision(LogicalType logicalType, int precision)`	Checks the precision of a type that defines a precision implicitly or explicitly.
`static boolean`	`hasScale(LogicalType logicalType, int scale)`	Checks the scale of all types that define a scale implicitly or explicitly.
`static boolean`	`hasWellDefinedString(LogicalType logicalType)`	Checks whether the given `LogicalType` has a well-defined string representation when calling `Object.toString()` on the internal data structure.
`static boolean`	`hasYearPrecision(LogicalType logicalType, int yearPrecision)`
`static boolean`	`isCompositeType(LogicalType logicalType)`	Checks if the given type is a composite type.
`static boolean`	`isProctimeAttribute(LogicalType logicalType)`
`static boolean`	`isRowtimeAttribute(LogicalType logicalType)`
`static boolean`	`isSingleFieldInterval(LogicalType logicalType)`
`static boolean`	`isTimeAttribute(LogicalType logicalType)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

hasNested

public static boolean hasNested(LogicalType logicalType,
                                Predicate<LogicalType> predicate)

Checks whether a (possibly nested) logical type fulfills the given predicate.

hasLegacyTypes
```
public static boolean hasLegacyTypes(LogicalType logicalType)
```
Checks whether a (possibly nested) logical type contains LegacyTypeInformationType or TypeInformationRawType.

isTimeAttribute

public static boolean isTimeAttribute(LogicalType logicalType)

isRowtimeAttribute

public static boolean isRowtimeAttribute(LogicalType logicalType)

isProctimeAttribute

public static boolean isProctimeAttribute(LogicalType logicalType)

canBeTimeAttributeType

public static boolean canBeTimeAttributeType(LogicalType logicalType)

isCompositeType
```
public static boolean isCompositeType(LogicalType logicalType)
```
Checks if the given type is a composite type.
Use getFieldCount(LogicalType), getFieldNames(LogicalType), getFieldTypes(LogicalType) for unified handling of composite types.

Parameters:

logicalType - Logical data type to check

Returns:

True if the type is composite type.

getLength

public static int getLength(LogicalType logicalType)

hasLength

public static boolean hasLength(LogicalType logicalType,
                                int length)

getPrecision
```
public static int getPrecision(LogicalType logicalType)
```
Returns the precision of all types that define a precision implicitly or explicitly.

hasPrecision

public static boolean hasPrecision(LogicalType logicalType,
                                   int precision)

Checks the precision of a type that defines a precision implicitly or explicitly.

getScale
```
public static int getScale(LogicalType logicalType)
```
Returns the scale of all types that define a scale implicitly or explicitly.

hasScale

public static boolean hasScale(LogicalType logicalType,
                               int scale)

Checks the scale of all types that define a scale implicitly or explicitly.

getYearPrecision

public static int getYearPrecision(LogicalType logicalType)

hasYearPrecision

public static boolean hasYearPrecision(LogicalType logicalType,
                                       int yearPrecision)

getDayPrecision

public static int getDayPrecision(LogicalType logicalType)

hasDayPrecision

public static boolean hasDayPrecision(LogicalType logicalType,
                                      int yearPrecision)

getFractionalPrecision

public static int getFractionalPrecision(LogicalType logicalType)

hasFractionalPrecision

public static boolean hasFractionalPrecision(LogicalType logicalType,
                                             int fractionalPrecision)

isSingleFieldInterval

public static boolean isSingleFieldInterval(LogicalType logicalType)

getFieldCount
```
public static int getFieldCount(LogicalType logicalType)
```
Returns the field count of row and structured types. Other types return 1.

getFieldNames

public static List<String> getFieldNames(LogicalType logicalType)

Returns the field names of row and structured types.

getFieldTypes

public static List<LogicalType> getFieldTypes(LogicalType logicalType)

Returns the field types of row and structured types.

hasWellDefinedString
```
public static boolean hasWellDefinedString(LogicalType logicalType)
```
Checks whether the given LogicalType has a well-defined string representation when calling Object.toString() on the internal data structure. The string representation would be similar in SQL or in a programming language.
Note: This method might not be necessary anymore, once we have implemented a utility that can convert any internal data structure to a well-defined string representation.

areComparable

public static boolean areComparable(LogicalType firstType,
                                    LogicalType secondType,
                                    StructuredType.StructuredComparison requiredComparison)

Class LogicalTypeChecks