Package com.apple.foundationdb.record.query.expressions

Class AndComponent

java.lang.Object

com.apple.foundationdb.record.query.expressions.AndOrComponent

com.apple.foundationdb.record.query.expressions.AndComponent

All Implemented Interfaces:

PlanHashable, ComponentWithChildren, QueryComponent, QueryHashable

@API(MAINTAINED)
public class AndComponent
extends AndOrComponent

A QueryComponent that is satisfied when all of its child components are satisfied. For tri-valued logic:

• If all children are true, then true.
• If any child is false, then false.
• Else null.

Nested Class Summary

Nested classes/interfaces inherited from interface com.apple.foundationdb.record.PlanHashable

PlanHashable.PlanHashKind

Nested classes/interfaces inherited from interface com.apple.foundationdb.record.QueryHashable

QueryHashable.QueryHashKind

Constructor Summary

Constructors

Constructor	Description
AndComponent(List<QueryComponent> operands)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
GraphExpansion	expand(CorrelationIdentifier base, List<String> fieldNamePrefix)	Expand this query component into a data flow graph.
static AndComponent	from(List<? extends QueryComponent> operands)
List<QueryComponent>	getChildren()	Children for this component, at least 2 of them.
int	hashCode()
boolean	isOr()
int	planHash(PlanHashable.PlanHashKind hashKind)	Return a hash similar to hashCode, but with the additional guarantee that is is stable across JVMs.
int	queryHash(QueryHashable.QueryHashKind hashKind)	Return a hash similar to hashCode, but with the additional guarantee that is is stable across JVMs.
String	toString()
void	validate(Descriptors.Descriptor descriptor)
QueryComponent	withOtherChildren(List<QueryComponent> newChildren)

Methods inherited from class com.apple.foundationdb.record.query.expressions.AndOrComponent

evalMessage, evalMessageAsync, isAsync

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.apple.foundationdb.record.query.expressions.ComponentWithChildren

getChildren

Methods inherited from interface com.apple.foundationdb.record.PlanHashable

planHash

Methods inherited from interface com.apple.foundationdb.record.query.expressions.QueryComponent

eval, evalAsync, expand, validate

Constructor Detail

AndComponent

public AndComponent(@Nonnull
                    List<QueryComponent> operands)

Method Detail

from

@Nonnull
public static AndComponent from(@Nonnull
                                List<? extends QueryComponent> operands)

isOr

public boolean isOr()

Specified by:

isOr in class AndOrComponent

toString

public String toString()

Overrides:

toString in class Object

withOtherChildren

public QueryComponent withOtherChildren(List<QueryComponent> newChildren)

expand

public GraphExpansion expand(@Nonnull
                             CorrelationIdentifier base,
                             @Nonnull
                             List<String> fieldNamePrefix)

Description copied from interface: QueryComponent

Expand this query component into a data flow graph. The returned graph represents an adequate representation of the component as composition of relational expressions and operators.

Parameters:

base - a an alias that refers to the data flow equivalent of an input to this component

fieldNamePrefix - a list of field names that accumulate a field nesting chain for non-repeated fields

Returns:

a new GraphExpansion representing the query graph equivalent of this query component

See Also:

TODO make this method private in Java 11

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

planHash

public int planHash(@Nonnull
                    PlanHashable.PlanHashKind hashKind)

Description copied from interface: PlanHashable

Return a hash similar to hashCode, but with the additional guarantee that is is stable across JVMs.

Parameters:

hashKind - the "kind" of hash to calculate. Each kind of hash has a particular logic with regards to included and excluded items.

Returns:

a stable hash code

queryHash

public int queryHash(@Nonnull
                     QueryHashable.QueryHashKind hashKind)

Description copied from interface: QueryHashable

Return a hash similar to hashCode, but with the additional guarantee that is is stable across JVMs.

Parameters:

hashKind - the "kind" of hash to calculate. Each kind of hash has a particular logic with regards to included and excluded items.

Returns:

a stable hash code

validate

public void validate(@Nonnull
                     Descriptors.Descriptor descriptor)

getChildren

@Nonnull
public List<QueryComponent> getChildren()

Children for this component, at least 2 of them.

Returns:

the children of this component