Package org.apache.flink.table.types.extraction

Class DataTypeExtractor

java.lang.Object

org.apache.flink.table.types.extraction.DataTypeExtractor

@Internal
public final class DataTypeExtractor
extends Object

Reflection-based utility that analyzes a given Type, method, or class to extract a (possibly nested) DataType from it.

Method Summary

Modifier and Type	Method	Description
static DataType	extractFromGeneric(DataTypeFactory typeFactory, Class<?> baseClass, int genericPos, Type contextType)	Extracts a data type from a type variable at genericPos of baseClass using the information of the most specific type contextType.
static DataType	extractFromGenericMethodParameter(DataTypeFactory typeFactory, Class<?> baseClass, Method method, int paramPos, int genericPos)	Extracts a data type from a method parameter by considering surrounding classes and parameter annotation.
static DataType	extractFromMethodOutput(DataTypeFactory typeFactory, Class<?> baseClass, Method method)	Extracts a data type from a method return type by considering surrounding classes and method annotation.
static DataType	extractFromMethodOutput(DataTypeFactory typeFactory, Class<?> baseClass, Method method, Type methodReturnType)	Extracts a data type from a method return type with specifying the method's type explicitly by considering surrounding classes and method annotation.
static DataType	extractFromMethodParameter(DataTypeFactory typeFactory, Class<?> baseClass, Method method, int paramPos)	Extracts a data type from a method parameter by considering surrounding classes and parameter annotation.
static DataType	extractFromType(DataTypeFactory typeFactory, Type type)	Extracts a data type from a type without considering surrounding classes or templates.
static DataType	extractFromType(DataTypeFactory typeFactory, org.apache.flink.table.types.extraction.DataTypeTemplate template, Type type)	Extracts a data type from a type without considering surrounding classes but templates.

Methods inherited from class java.lang.Object

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

Method Detail

extractFromType

public static DataType extractFromType(DataTypeFactory typeFactory,
                                       Type type)

Extracts a data type from a type without considering surrounding classes or templates.

extractFromType

public static DataType extractFromType(DataTypeFactory typeFactory,
                                       org.apache.flink.table.types.extraction.DataTypeTemplate template,
                                       Type type)

Extracts a data type from a type without considering surrounding classes but templates.

extractFromGeneric

public static DataType extractFromGeneric(DataTypeFactory typeFactory,
                                          Class<?> baseClass,
                                          int genericPos,
                                          Type contextType)

Extracts a data type from a type variable at genericPos of baseClass using the information of the most specific type contextType.

extractFromMethodParameter

public static DataType extractFromMethodParameter(DataTypeFactory typeFactory,
                                                  Class<?> baseClass,
                                                  Method method,
                                                  int paramPos)

Extracts a data type from a method parameter by considering surrounding classes and parameter annotation.

extractFromGenericMethodParameter

public static DataType extractFromGenericMethodParameter(DataTypeFactory typeFactory,
                                                         Class<?> baseClass,
                                                         Method method,
                                                         int paramPos,
                                                         int genericPos)

Extracts a data type from a method parameter by considering surrounding classes and parameter annotation. This version assumes that the parameter is a generic type, and uses the generic position type as the extracted data type. For example, if the parameter is a CompletableFuture<Long> and genericPos is 0, it will extract Long.

extractFromMethodOutput

public static DataType extractFromMethodOutput(DataTypeFactory typeFactory,
                                               Class<?> baseClass,
                                               Method method)

Extracts a data type from a method return type by considering surrounding classes and method annotation.

extractFromMethodOutput

public static DataType extractFromMethodOutput(DataTypeFactory typeFactory,
                                               Class<?> baseClass,
                                               Method method,
                                               Type methodReturnType)

Extracts a data type from a method return type with specifying the method's type explicitly by considering surrounding classes and method annotation.