org.apache.flink.streaming.util

Class FieldAccessor<R,F>

java.lang.Object

org.apache.flink.streaming.util.FieldAccessor<R,F>

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

FieldAccessor.ArrayFieldAccessor, FieldAccessor.PojoFieldAccessor, FieldAccessor.ProductFieldAccessor, FieldAccessor.SimpleFieldAccessor, FieldAccessor.TupleFieldAccessor

public abstract class FieldAccessor<R,F>
extends Object
implements Serializable

These classes encapsulate the logic of accessing a field specified by the user as either an index or a field expression string. TypeInformation can also be requested for the field. The position index might specify a field of a Tuple, an array, or a simple type (only "0th field").

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FieldAccessor.ArrayFieldAccessor<R,F>
static class	FieldAccessor.PojoFieldAccessor<R,F>
static class	FieldAccessor.ProductFieldAccessor<R,F>
static class	FieldAccessor.SimpleFieldAccessor<R>
static class	FieldAccessor.TupleFieldAccessor<R,F>

Constructor Summary

Constructors

Constructor and Description
FieldAccessor()

Method Summary

Modifier and Type	Method and Description
static <R,F> FieldAccessor<R,F>	create(int pos, org.apache.flink.api.common.typeinfo.TypeInformation<R> typeInfo, org.apache.flink.api.common.ExecutionConfig config)
static <R,F> FieldAccessor<R,F>	create(String field, org.apache.flink.api.common.typeinfo.TypeInformation<R> typeInfo, org.apache.flink.api.common.ExecutionConfig config)
abstract F	get(R record)
org.apache.flink.api.common.typeinfo.TypeInformation<F>	getFieldType()
abstract R	set(R record, F fieldValue)

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldAccessor

public FieldAccessor()

Method Detail

getFieldType

public org.apache.flink.api.common.typeinfo.TypeInformation<F> getFieldType()

get

public abstract F get(R record)

set

public abstract R set(R record,
                      F fieldValue)

create

public static <R,F> FieldAccessor<R,F> create(int pos,
                                              org.apache.flink.api.common.typeinfo.TypeInformation<R> typeInfo,
                                              org.apache.flink.api.common.ExecutionConfig config)

create

public static <R,F> FieldAccessor<R,F> create(String field,
                                              org.apache.flink.api.common.typeinfo.TypeInformation<R> typeInfo,
                                              org.apache.flink.api.common.ExecutionConfig config)