Package com.day.cq.search.eval

Class PredicateGroupEvaluator

java.lang.Object

com.day.cq.search.eval.AbstractPredicateEvaluator

com.day.cq.search.eval.PredicateGroupEvaluator

All Implemented Interfaces:

PredicateEvaluator

Direct Known Subclasses:

SavedQueryPredicate

public class PredicateGroupEvaluator
extends AbstractPredicateEvaluator

Allows to build nested conditions. Groups can contain nested groups. Everything in a querybuilder query is implicitly in a root group, which can have p.or and p.not as well.

Example for matching either one of two properties against a value: group.p.or=true group.1_property=jcr:title group.1_property.value=My Page group.2_property=navTitle group.2_property.value=My Page This is conceptually (1_property OR 2_property).

Example for nested groups: fulltext=Management group.p.or=true group.1_group.path=/content/geometrixx/en group.1_group.type=cq:Page group.2_group.path=/content/dam/geometrixx group.2_group.type=dam:Asset This searches for the term "Management" within pages in /content/geometrixx/en or in assets in /content/dam/geometrixx. This is conceptually fulltext AND ( (path AND type) OR (path AND type) ). Be aware that such OR joins need good indexes for performance.

Name:

group

Properties:

p.or

if set to "true", only one predicate in the group must match (defaults to "false", meaning all must match)

p.not

if set to "true", negates the group (defaults to "false")

<predicate>

add nested predicates

N_<predicate>

add multiple nested predicates of the same time, e.g. 1_property, 2_property, ...

Since:

5.2

Constructor Summary

Constructors

Constructor	Description
PredicateGroupEvaluator()

Method Summary

Modifier and Type	Method	Description
boolean	canFilter(Predicate predicate, EvaluationContext context)	Returns the same as the deprecated AbstractPredicateEvaluator.isFiltering(Predicate, EvaluationContext) method (ie.
boolean	canXpath(Predicate predicate, EvaluationContext context)	Returns the inverted boolean value of the deprecated AbstractPredicateEvaluator.isFiltering(Predicate, EvaluationContext) method (ie.
FacetExtractor	getFacetExtractor(Predicate predicate, EvaluationContext context)	Default implementation that always returns null, ie.
java.lang.String	getXPathExpression(Predicate p, EvaluationContext context)	Default implementation that always returns null, ie.
boolean	includes(Predicate p, javax.jcr.query.Row row, EvaluationContext context)	Default implementation that always returns true, ie.
java.lang.String	listFilteringPredicates(PredicateGroup group, EvaluationContext context)

Methods inherited from class com.day.cq.search.eval.AbstractPredicateEvaluator

getOrderByComparator, getOrderByProperties, isFiltering

Methods inherited from class java.lang.Object

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

Constructor Detail

PredicateGroupEvaluator

public PredicateGroupEvaluator()

Method Detail

getXPathExpression

public java.lang.String getXPathExpression(Predicate p,
                                           EvaluationContext context)

Description copied from class: AbstractPredicateEvaluator

Default implementation that always returns null, ie. adds nothing to the XPath query. Subclasses can choose whether they want to implement this method or use the AbstractPredicateEvaluator.includes(Predicate, Row, EvaluationContext) method for advanced filtering (or both).

Specified by:

getXPathExpression in interface PredicateEvaluator

Overrides:

getXPathExpression in class AbstractPredicateEvaluator

Parameters:

p - predicate (for this evaluator type) which is evaluated

context - helper class which provides access to various elements of the query evaluation

Returns:

string containing an XPath predicateEvaluator expression

includes

public boolean includes(Predicate p,
                        javax.jcr.query.Row row,
                        EvaluationContext context)

Description copied from class: AbstractPredicateEvaluator

Default implementation that always returns true, ie. it does not "touch" the result set at all.

Specified by:

includes in interface PredicateEvaluator

Overrides:

includes in class AbstractPredicateEvaluator

Parameters:

p - predicate (for this evaluator type) which is evaluated

row - current row of the result set returned through the xpath query

context - helper class which provides access to various elements of the query evaluation

Returns:

true if this row should be part of the final result set, false if it should be dropped

canXpath

public boolean canXpath(Predicate predicate,
                        EvaluationContext context)

Description copied from class: AbstractPredicateEvaluator

Returns the inverted boolean value of the deprecated AbstractPredicateEvaluator.isFiltering(Predicate, EvaluationContext) method (ie. if not overridden, true).

Specified by:

canXpath in interface PredicateEvaluator

Overrides:

canXpath in class AbstractPredicateEvaluator

Parameters:

predicate - predicate (for this evaluator type) which is evaluated

context - helper class which provides access to various elements of the query evaluation

Returns:

true if this evaluator can express itself via xpath, ie. PredicateEvaluator.getXPathExpression(Predicate, EvaluationContext)

canFilter

public boolean canFilter(Predicate predicate,
                         EvaluationContext context)

Description copied from class: AbstractPredicateEvaluator

Returns the same as the deprecated AbstractPredicateEvaluator.isFiltering(Predicate, EvaluationContext) method (ie. if not overridden, false).

Specified by:

canFilter in interface PredicateEvaluator

Overrides:

canFilter in class AbstractPredicateEvaluator

Parameters:

predicate - predicate (for this evaluator type) which is evaluated

context - helper class which provides access to various elements of the query evaluation

Returns:

true if this evaluator can be express itself via filtering, ie. PredicateEvaluator.includes(Predicate, Row, EvaluationContext)

listFilteringPredicates

public java.lang.String listFilteringPredicates(PredicateGroup group,
                                                EvaluationContext context)

getFacetExtractor

public FacetExtractor getFacetExtractor(Predicate predicate,
                                        EvaluationContext context)

Description copied from class: AbstractPredicateEvaluator

Default implementation that always returns null, ie. no facets will be extracted for the predicate.

Specified by:

getFacetExtractor in interface PredicateEvaluator

Overrides:

getFacetExtractor in class AbstractPredicateEvaluator

Parameters:

predicate - predicate (for this evaluator type) which is evaluated

context - helper class which provides access to various elements of the query evaluation

Returns:

a FacetExtractor that is used to create a Facet or null if no extractor shall be provided