com.hazelcast.query.impl.predicates

Class EqualPredicate

java.lang.Object

com.hazelcast.query.impl.predicates.AbstractPredicate<K,V>

com.hazelcast.query.impl.predicates.AbstractIndexAwarePredicate

com.hazelcast.query.impl.predicates.EqualPredicate

All Implemented Interfaces:

DataSerializable, IdentifiedDataSerializable, NegatablePredicate, RangePredicate, IndexAwarePredicate, Predicate, VisitablePredicate, Serializable

Direct Known Subclasses:

NotEqualPredicate

public class EqualPredicate
extends AbstractIndexAwarePredicate
implements NegatablePredicate, RangePredicate, VisitablePredicate

Equal Predicate

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Comparable	value

Constructor Summary

Constructors

Constructor and Description
EqualPredicate()
EqualPredicate(String attribute)
EqualPredicate(String attribute, Comparable value)

Method Summary

Modifier and Type	Method and Description
Predicate	accept(Visitor visitor, Indexes indexes) Accept visitor.
protected boolean	applyForSingleAttributeValue(Comparable attributeValue)
boolean	canEqual(Object other)
boolean	equals(Object o)
Set<QueryableEntry>	filter(QueryContext queryContext) Produces a filtered entry set by utilizing the indexes available while executing the query in the given query context.
String	getAttribute()
Comparable	getFrom()
int	getId() Returns type identifier for this class.
Comparable	getTo()
int	hashCode()
boolean	isFromInclusive()
boolean	isToInclusive()
Predicate	negate() Create logical negation of itself.
void	readData(ObjectDataInput in) Reads fields from the input stream
String	toString()
void	writeData(ObjectDataOutput out) Writes object fields to output stream

Methods inherited from class com.hazelcast.query.impl.predicates.AbstractIndexAwarePredicate

getIndex, isIndexed, matchIndex

Methods inherited from class com.hazelcast.query.impl.predicates.AbstractPredicate

apply, convert, getFactoryId

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.hazelcast.query.Predicate

apply

Field Detail

value

protected Comparable value

Constructor Detail

EqualPredicate

public EqualPredicate()

EqualPredicate

public EqualPredicate(String attribute)

EqualPredicate

public EqualPredicate(String attribute,
                      Comparable value)

Method Detail

accept

public Predicate accept(Visitor visitor,
                        Indexes indexes)

Description copied from interface: VisitablePredicate

Accept visitor. Predicate can either return it's own instance if no modification was done as a result of the visit. In the case there is a change needed then the predicate has to return changed copy of itself. Predicates has to be treated as immutable for optimization purposes.

Specified by:

accept in interface VisitablePredicate

Parameters:

visitor - visitor to accept

indexes - indexes

Returns:

itself or its changed copy

filter

public Set<QueryableEntry> filter(QueryContext queryContext)

Description copied from interface: IndexAwarePredicate

Produces a filtered entry set by utilizing the indexes available while executing the query in the given query context.

The query engine assumes this method produces the result set faster than a simple evaluation of the predicate on every entry.

Specified by:

filter in interface IndexAwarePredicate

Parameters:

queryContext - the query context to access the indexes. The passed query context is valid only for a duration of a single call to the method.

Returns:

the produced filtered entry set.

applyForSingleAttributeValue

protected boolean applyForSingleAttributeValue(Comparable attributeValue)

Specified by:

applyForSingleAttributeValue in class AbstractPredicate

writeData

public void writeData(ObjectDataOutput out)
               throws IOException

Description copied from interface: DataSerializable

Writes object fields to output stream

Specified by:

writeData in interface DataSerializable

Overrides:

writeData in class AbstractPredicate

Parameters:

out - output

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.

readData

public void readData(ObjectDataInput in)
              throws IOException

Description copied from interface: DataSerializable

Reads fields from the input stream

Specified by:

readData in interface DataSerializable

Overrides:

readData in class AbstractPredicate

Parameters:

in - input

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the input stream has been closed.

equals

public boolean equals(Object o)

Overrides:

equals in class AbstractPredicate

canEqual

public boolean canEqual(Object other)

Overrides:

canEqual in class AbstractPredicate

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractPredicate

toString

public String toString()

Overrides:

toString in class Object

negate

public Predicate negate()

Description copied from interface: NegatablePredicate

Create logical negation of itself.

Specified by:

negate in interface NegatablePredicate

Returns:

A predicate which is a logical negation of itself.

getId

public int getId()

Description copied from interface: IdentifiedDataSerializable

Returns type identifier for this class. It should be unique per DataSerializableFactory.

Specified by:

getId in interface IdentifiedDataSerializable

Returns:

type ID

getAttribute

public String getAttribute()

Specified by:

getAttribute in interface RangePredicate

Returns:

the attribute on which this range predicate acts.

getFrom

public Comparable getFrom()

Specified by:

getFrom in interface RangePredicate

Returns:

the lower/left bound of this range predicate or null if the predicate range is left-unbounded.

isFromInclusive

public boolean isFromInclusive()

Specified by:

isFromInclusive in interface RangePredicate

Returns:

true if the predicate range is left-closed, false otherwise.

Can't be true if the predicate range is left-unbounded.

getTo

public Comparable getTo()

Specified by:

getTo in interface RangePredicate

Returns:

the upper/right bound of this range predicate or null if the predicate range is right-unbounded.

isToInclusive

public boolean isToInclusive()

Specified by:

isToInclusive in interface RangePredicate

Returns:

true if the predicate range is right-closed, false otherwise.

Can't be true if the predicate range is right-unbounded.