com.edorasware.commons.core.query

Class Predicate

java.lang.Object

com.edorasware.commons.core.query.Predicate

Direct Known Subclasses:

IdentityLinkPredicate, MultipleNamedValuePredicate, NamedValuePredicate, NeverMatchingPredicate, QueryParameterPredicate, RawPredicate, RenderingModePredicate

public abstract class Predicate
extends Object

Defines a criterion to be matched in a Query.

Multiple predicates can be combined through boolean operators in bulk via and(2 .. n Predicates) / or(2 .. n Predicates).

Constructor Summary

Constructors

Constructor and Description
Predicate()

Method Summary

Modifier and Type	Method and Description
Predicate	and(Predicate predicate) Concatenates this predicate with the given predicate to a combined predicate through a logical AND operator.
Predicate	apply(PredicateTransformation transformation) Applies the given transformation, returning the transformed predicate.
Predicate	not() Negates this predicate through a logical NOT operator.
Predicate	or(Predicate predicate) Concatenates this predicate with the given predicate to a combined predicate through a logical OR operator.

Methods inherited from class java.lang.Object

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

Constructor Detail

Predicate

public Predicate()

Method Detail

and

public Predicate and(Predicate predicate)

Concatenates this predicate with the given predicate to a combined predicate through a logical AND operator.

Parameters:

predicate - the other predicate

Returns:

a new predicate representing the concatenation

or

public Predicate or(Predicate predicate)

Concatenates this predicate with the given predicate to a combined predicate through a logical OR operator.

Parameters:

predicate - the other predicate

Returns:

a new predicate representing the concatenation

not

public Predicate not()

Negates this predicate through a logical NOT operator.

Returns:

a new predicate representing the negation

apply

public Predicate apply(PredicateTransformation transformation)

Applies the given transformation, returning the transformed predicate. If the predicate implementation wraps sub-predicates then this method needs to be overwritten to transform the sub-predicates as well.

Parameters:

transformation - the predicate transformation to be applied

Returns:

the transformed predicate (or the current instance if no transformation was applied)