Package com.apple.foundationdb.relational.util

Class NullableArrayUtils

java.lang.Object

com.apple.foundationdb.relational.util.NullableArrayUtils

@API(EXPERIMENTAL)
public final class NullableArrayUtils
extends Object

A Utils class that holds logic related to nullable arrays. Nullable Arrays are arrays that, if unset, will be NULL. Non-nullable arrays are arrays that, if unset, will be empty list.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	REPEATED_FIELD_NAME

Method Summary

Modifier and Type	Method	Description
static String	getRepeatedFieldName()
static boolean	isWrappedArrayDescriptor(Descriptors.Descriptor descriptor)
static boolean	isWrappedArrayDescriptor(String fieldName, Descriptors.Descriptor parentDescriptor)
static RecordMetaDataProto.KeyExpression	wrapArray(RecordMetaDataProto.KeyExpression keyExpression, com.apple.foundationdb.record.query.plan.cascades.typing.Type.Record record, boolean containsNullableArray)	Adds the wrapped array structure in key expressions if the schema doesn't contain non-nullable array.
static RecordMetaDataProto.KeyExpression	wrapArray(RecordMetaDataProto.KeyExpression keyExpression, Descriptors.Descriptor parentDescriptor, boolean containsNullableArray)

Methods inherited from class java.lang.Object

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

Field Details

REPEATED_FIELD_NAME

public static final String REPEATED_FIELD_NAME

See Also:

• Constant Field Values

Method Details

getRepeatedFieldName

public static String getRepeatedFieldName()

isWrappedArrayDescriptor

public static boolean isWrappedArrayDescriptor(String fieldName,
 Descriptors.Descriptor parentDescriptor)

isWrappedArrayDescriptor

public static boolean isWrappedArrayDescriptor(@Nonnull
 Descriptors.Descriptor descriptor)

wrapArray

public static RecordMetaDataProto.KeyExpression wrapArray(RecordMetaDataProto.KeyExpression keyExpression,
 com.apple.foundationdb.record.query.plan.cascades.typing.Type.Record record,
 boolean containsNullableArray)

Adds the wrapped array structure in key expressions if the schema doesn't contain non-nullable array. For example, reviews.rating will change to reviews.values.rating

Parameters:

keyExpression - The key expression to modify.

record - The record of the table.

containsNullableArray - true if nullable arrays are to be found, otherwise false.

Returns:

modified key expression where any nullable array is wrapped. TODO Add the wrapped array structure for nullable arrays.

wrapArray

public static RecordMetaDataProto.KeyExpression wrapArray(RecordMetaDataProto.KeyExpression keyExpression,
 Descriptors.Descriptor parentDescriptor,
 boolean containsNullableArray)