org.apache.flink.formats.protobuf.util

Class PbCodegenUtils

java.lang.Object

org.apache.flink.formats.protobuf.util.PbCodegenUtils

public class PbCodegenUtils
extends Object

Codegen utils only used in protobuf format.

Constructor Summary

Constructors

Constructor and Description
PbCodegenUtils()

Method Summary

Modifier and Type	Method and Description
static Class	compileClass(ClassLoader classloader, String className, String code)
static String	convertFlinkArrayElementToPbWithDefaultValueCode(String flinkArrDataVar, String iVar, String resultPbVar, com.google.protobuf.Descriptors.FieldDescriptor elementPbFd, LogicalType elementDataType, PbFormatContext pbFormatContext, int indent) This method will be called from serializer of flink array/map type because flink contains both array/map type in array format.
static String	flinkContainerElementCode(String flinkContainerCode, String index, LogicalType eleType)
static String	getTypeStrFromLogicType(LogicalType type) Get java type str from LogicalType which directly fetched from flink type.
static String	getTypeStrFromProto(com.google.protobuf.Descriptors.FieldDescriptor fd, boolean isList) Get java type str from Descriptors.FieldDescriptor which directly fetched from protobuf object.
static String	pbDefaultValueCode(com.google.protobuf.Descriptors.FieldDescriptor fieldDescriptor, PbFormatContext pbFormatContext) Get protobuf default value from Descriptors.FieldDescriptor.

Methods inherited from class java.lang.Object

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

Constructor Detail

PbCodegenUtils

public PbCodegenUtils()

Method Detail

flinkContainerElementCode

public static String flinkContainerElementCode(String flinkContainerCode,
                                               String index,
                                               LogicalType eleType)

Parameters:

flinkContainerCode - code phrase which represent flink container type like row/array in codegen sections

index - the index number in flink container type

eleType - the element type

getTypeStrFromProto

public static String getTypeStrFromProto(com.google.protobuf.Descriptors.FieldDescriptor fd,
                                         boolean isList)
                                  throws PbCodegenException

Get java type str from Descriptors.FieldDescriptor which directly fetched from protobuf object.

Returns:

The returned code phrase will be used as java type str in codegen sections.

Throws:

PbCodegenException

getTypeStrFromLogicType

public static String getTypeStrFromLogicType(LogicalType type)

Get java type str from LogicalType which directly fetched from flink type.

Returns:

The returned code phrase will be used as java type str in codegen sections.

pbDefaultValueCode

public static String pbDefaultValueCode(com.google.protobuf.Descriptors.FieldDescriptor fieldDescriptor,
                                        PbFormatContext pbFormatContext)
                                 throws PbCodegenException

Get protobuf default value from Descriptors.FieldDescriptor.

Returns:

The java code phrase which represents default value calculation.

Throws:

PbCodegenException

convertFlinkArrayElementToPbWithDefaultValueCode

public static String convertFlinkArrayElementToPbWithDefaultValueCode(String flinkArrDataVar,
                                                                      String iVar,
                                                                      String resultPbVar,
                                                                      com.google.protobuf.Descriptors.FieldDescriptor elementPbFd,
                                                                      LogicalType elementDataType,
                                                                      PbFormatContext pbFormatContext,
                                                                      int indent)
                                                               throws PbCodegenException

This method will be called from serializer of flink array/map type because flink contains both array/map type in array format. Map/Array cannot contain null value in pb object then we must do conversion in case of null values in map/array type.

Parameters:

flinkArrDataVar - code phrase represent arrayData of arr type or keyData/valueData in map type.

iVar - the index in arrDataVar

resultPbVar - the returned pb variable name in codegen.

elementPbFd - Descriptors.FieldDescriptor of element type in proto object

elementDataType - LogicalType of element type in flink object

Returns:

The java code segment which represents field value retrieval.

Throws:

PbCodegenException

compileClass

public static Class compileClass(ClassLoader classloader,
                                 String className,
                                 String code)
                          throws ClassNotFoundException

Throws:

ClassNotFoundException