org.apache.ambari.server.api.query

Class ProcessingPredicateVisitor

java.lang.Object

org.apache.ambari.server.api.query.ProcessingPredicateVisitor

All Implemented Interfaces:

PredicateVisitor

public class ProcessingPredicateVisitor
extends Object
implements PredicateVisitor

A predicate visitor used to process a predicate to do the following : 1) Create a new predicate with all sub-resource elements contained in the visited predicate removed (converted to AlwaysPredicate). 2) Create a set of any sub-resource subResourceCategories that were referenced in the predicate being visited (i.e. components, host_components, etc). 3) Create a set of any sub-resource subResourceProperties that were referenced in the predicate being visited. For example, the service level query the predicate ... ServiceInfo/service_name = HBASE AND components/ServiceComponentInfo/category = SLAVE AND components/host_components/metrics/cpu/cpu_num >= 1 ... will produce ... Predicate : ServiceInfo/service_name = HBASE Sub-resource subResourceCategories : {components} Sub-resource subResourceProperties : {components/ServiceComponentInfo/category, components/host_components/metrics/cpu/cpu_num}

Constructor Summary

Constructors

Constructor and Description
ProcessingPredicateVisitor(QueryImpl query) Constructor.

Method Summary

Modifier and Type	Method and Description
void	acceptAlwaysPredicate(AlwaysPredicate predicate)
void	acceptArrayPredicate(ArrayPredicate arrayPredicate)
void	acceptCategoryPredicate(CategoryPredicate predicate)
void	acceptComparisonPredicate(ComparisonPredicate predicate)
void	acceptUnaryPredicate(UnaryPredicate predicate)
Predicate	getProcessedPredicate() Get a new predicate with all sub-resource elements contained in the visited predicate removed.
Set<String>	getSubResourceCategories() Get a set of any sub-resource subResourceCategories that were referenced in the predicate that was visited.
Set<String>	getSubResourceProperties() Get a set of any sub-resource subResourceProperties that were referenced in the predicate that was visited.

Methods inherited from class java.lang.Object

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

Constructor Detail

ProcessingPredicateVisitor

public ProcessingPredicateVisitor(QueryImpl query)

Constructor.

Parameters:

query - associated query

Method Detail

acceptComparisonPredicate

public void acceptComparisonPredicate(ComparisonPredicate predicate)

Specified by:

acceptComparisonPredicate in interface PredicateVisitor

acceptArrayPredicate

public void acceptArrayPredicate(ArrayPredicate arrayPredicate)

Specified by:

acceptArrayPredicate in interface PredicateVisitor

acceptUnaryPredicate

public void acceptUnaryPredicate(UnaryPredicate predicate)

Specified by:

acceptUnaryPredicate in interface PredicateVisitor

acceptAlwaysPredicate

public void acceptAlwaysPredicate(AlwaysPredicate predicate)

Specified by:

acceptAlwaysPredicate in interface PredicateVisitor

acceptCategoryPredicate

public void acceptCategoryPredicate(CategoryPredicate predicate)

Specified by:

acceptCategoryPredicate in interface PredicateVisitor

getProcessedPredicate

public Predicate getProcessedPredicate()

Get a new predicate with all sub-resource elements contained in the visited predicate removed.

Returns:

the new predicate

getSubResourceCategories

public Set<String> getSubResourceCategories()

Get a set of any sub-resource subResourceCategories that were referenced in the predicate that was visited.

Returns:

the set of sub-resource categories

getSubResourceProperties

public Set<String> getSubResourceProperties()

Get a set of any sub-resource subResourceProperties that were referenced in the predicate that was visited.

Returns:

the set of sub-resource properties