org.apache.beam.sdk.schemas

Class Schema

java.lang.Object

org.apache.beam.sdk.schemas.Schema

All Implemented Interfaces:

java.io.Serializable

@Experimental(value=SCHEMAS)
public class Schema
extends java.lang.Object
implements java.io.Serializable

Schema describes the fields in Row.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Schema.Builder Builder class for building Schema objects.
static class	Schema.EquivalenceNullablePolicy Control whether nullable is included in equivalence check.
static class	Schema.Field Field of a row.
static class	Schema.FieldType A descriptor of a single field type.
static interface	Schema.LogicalType<InputT,BaseT> A LogicalType allows users to define a custom schema type.
static class	Schema.TypeName An enumerated list of type constructors.

Constructor Summary

Constructors

Constructor and Description
Schema(java.util.List<Schema.Field> fields)

Method Summary

Modifier and Type	Method and Description
boolean	assignableTo(Schema other) Returns true if this Schema can be assigned to another Schema.
boolean	assignableToIgnoreNullable(Schema other) Returns true if this Schema can be assigned to another Schema, igmoring nullable.
static Schema.Builder	builder()
boolean	equals(java.lang.Object o) Returns true if two Schemas have the same fields in the same order.
boolean	equivalent(Schema other) Returns true if two Schemas have the same fields, but possibly in different orders.
Schema.Field	getField(int index) Return a field by index.
Schema.Field	getField(java.lang.String name)
int	getFieldCount() Return the count of fields.
java.util.List<java.lang.String>	getFieldNames() Return the list of all field names.
java.util.List<Schema.Field>	getFields()
java.util.UUID	getUUID() Get this schema's UUID.
boolean	hasField(java.lang.String fieldName) Returns true if fieldName exists in the schema, false otherwise.
int	hashCode()
int	indexOf(java.lang.String fieldName) Find the index of a given field.
java.lang.String	nameOf(int fieldIndex) Return the name of field by index.
static Schema	of(Schema.Field... fields)
void	setUUID(java.util.UUID uuid) Set this schema's UUID.
static java.util.stream.Collector<Schema.Field,java.util.List<Schema.Field>,Schema>	toSchema() Collects a stream of Schema.Fields into a Schema.
java.lang.String	toString()
boolean	typesEqual(Schema other) Returns true if two schemas are equal ignoring field names and descriptions.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Schema

public Schema(java.util.List<Schema.Field> fields)

Method Detail

builder

public static Schema.Builder builder()

of

public static Schema of(Schema.Field... fields)

setUUID

public void setUUID(java.util.UUID uuid)

Set this schema's UUID. All schemas with the same UUID must be guaranteed to be identical.

getUUID

@Nullable
public java.util.UUID getUUID()

Get this schema's UUID.

equals

public boolean equals(java.lang.Object o)

Returns true if two Schemas have the same fields in the same order.

Overrides:

equals in class java.lang.Object

typesEqual

public boolean typesEqual(Schema other)

Returns true if two schemas are equal ignoring field names and descriptions.

equivalent

public boolean equivalent(Schema other)

Returns true if two Schemas have the same fields, but possibly in different orders.

assignableTo

public boolean assignableTo(Schema other)

Returns true if this Schema can be assigned to another Schema. *

assignableToIgnoreNullable

public boolean assignableToIgnoreNullable(Schema other)

Returns true if this Schema can be assigned to another Schema, igmoring nullable. *

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

getFields

public java.util.List<Schema.Field> getFields()

toSchema

public static java.util.stream.Collector<Schema.Field,java.util.List<Schema.Field>,Schema> toSchema()

Collects a stream of Schema.Fields into a Schema.

getFieldNames

public java.util.List<java.lang.String> getFieldNames()

Return the list of all field names.

getField

public Schema.Field getField(int index)

Return a field by index.

getField

public Schema.Field getField(java.lang.String name)

indexOf

public int indexOf(java.lang.String fieldName)

Find the index of a given field.

hasField

public boolean hasField(java.lang.String fieldName)

Returns true if fieldName exists in the schema, false otherwise.

nameOf

public java.lang.String nameOf(int fieldIndex)

Return the name of field by index.

getFieldCount

public int getFieldCount()

Return the count of fields.