Package com.apple.foundationdb.record.metadata

Class Key.Evaluated

java.lang.Object

com.apple.foundationdb.record.metadata.Key.Evaluated

Enclosing class:

Key

public static class Key.Evaluated
extends Object

Represents the list objects for a key in a secondary index or primary storage. To convert this into a Tuple for storage, simply call `Tuple.from(evaluated.toList())`

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Key.Evaluated.NullStandin	Values used in index keys in place of missing fields.

Field Summary

Fields

Modifier and Type	Field	Description
static Key.Evaluated	EMPTY	A key containing no elements.
static Key.Evaluated	NULL	A key containing just the null element.

Method Summary

Modifier and Type	Method	Description
Key.Evaluated	append(Key.Evaluated secondValue)	Creates a new key by appending another key to this one.
static Key.Evaluated	concatenate(Object first, Object... rest)	Primarily for tests, shorthand for creating a concatenation with a bunch of elements, see concatenate.
static Key.Evaluated	concatenate(List<Object> values)	Take a list of scalars and concatenate them in a single key.
boolean	containsNonUniqueNull()	Check for NULL value that inhibits unique indexes.
boolean	equals(Object o)
static List<Key.Evaluated>	fan(List<Object> valuesToAdd)	Fanout a list of scalars into a key for each value.
static Key.Evaluated	fromTuple(Tuple tuple)	Take a Tuple and create the corresponding key from it.
double	getDouble(int idx)
float	getFloat(int idx)
long	getLong(int idx)
Double	getNullableDouble(int idx)
Float	getNullableFloat(int idx)
Long	getNullableLong(int idx)
Object	getObject(int idx)
<T> T	getObject(int idx, Class<T> clazz)
String	getString(int idx)
int	hashCode()
static Key.Evaluated	scalar(Object object)	Creates a new key with just a single value.
int	size()
Key.Evaluated	subKey(int start, int end)
List<Object>	toList()	Converts to a list.
String	toString()
Tuple	toTuple()	Convert this key to the corresponding Tuple that can then be serialized into the database.
List<Object>	toTupleAppropriateList()	Converts to a list.
List<Object>	values()

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY

public static final Key.Evaluated EMPTY

A key containing no elements.

NULL

public static final Key.Evaluated NULL

A key containing just the null element.

Method Detail

scalar

@Nonnull
public static Key.Evaluated scalar(@Nullable
                                   Object object)

Creates a new key with just a single value.

Parameters:

object - the lone value in the key

Returns:

a new key for the one value

fan

@Nonnull
public static List<Key.Evaluated> fan(@Nonnull
                                      List<Object> valuesToAdd)

Fanout a list of scalars into a key for each value.

Parameters:

valuesToAdd - the list of scalars

Returns:

one key for each value in valuesToAdd

concatenate

@Nonnull
public static Key.Evaluated concatenate(@Nonnull
                                        List<Object> values)

Take a list of scalars and concatenate them in a single key. Note this is a key containing the list of values, as opposed to a key with a single value that is a list.

Parameters:

values - the values to combine together into a key

Returns:

a new key with the given values

concatenate

@Nonnull
public static Key.Evaluated concatenate(@Nullable
                                        Object first,
                                        @Nullable
                                        Object... rest)

Primarily for tests, shorthand for creating a concatenation with a bunch of elements, see concatenate.

Parameters:

first - the first value to be concatenated, avoids type conflicts with the other concatenate

rest - the rest of the values

Returns:

a new key consisting of the provided values

fromTuple

@Nonnull
public static Key.Evaluated fromTuple(@Nonnull
                                      Tuple tuple)

Take a Tuple and create the corresponding key from it.

Parameters:

tuple - the tuple to convert

Returns:

a new key based on the given tuple

toTuple

@Nonnull
public Tuple toTuple()

Convert this key to the corresponding Tuple that can then be serialized into the database.

Returns:

this key converted into a Tuple

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

getObject

@Nullable
public Object getObject(int idx)

getObject

@Nullable
public <T> T getObject(int idx,
                       Class<T> clazz)

getLong

public long getLong(int idx)

getNullableLong

@Nullable
public Long getNullableLong(int idx)

getDouble

public double getDouble(int idx)

getNullableDouble

@Nullable
public Double getNullableDouble(int idx)

getFloat

public float getFloat(int idx)

getNullableFloat

@Nullable
public Float getNullableFloat(int idx)

getString

@Nullable
public String getString(int idx)

append

@Nonnull
public Key.Evaluated append(@Nonnull
                            Key.Evaluated secondValue)

Creates a new key by appending another key to this one.

Parameters:

secondValue - another key that will form the second part of the new key.

Returns:

a new key consisting of the elements in this key, and then the elements of the second key

toList

@Nonnull
public List<Object> toList()

Converts to a list. Useful for creating tuples

Returns:

the elements of this key value

toTupleAppropriateList

@Nonnull
public List<Object> toTupleAppropriateList()

Converts to a list. Useful for creating tuples. If possible the underlying objects will be converted to types that Tuple can handle.

Returns:

the elements of this key value

containsNonUniqueNull

public boolean containsNonUniqueNull()

Check for NULL value that inhibits unique indexes.

Returns:

true if this has a null value

values

public List<Object> values()

size

public int size()

subKey

public Key.Evaluated subKey(int start,
                            int end)