org.apache.jackrabbit.oak.query.ast

Class PropertyExistenceImpl

java.lang.Object

org.apache.jackrabbit.oak.query.ast.ConstraintImpl

org.apache.jackrabbit.oak.query.ast.PropertyExistenceImpl

public class PropertyExistenceImpl
extends ConstraintImpl

A condition to check if the property exists ("is not null").

Field Summary

Fields

Modifier and Type	Field and Description
protected QueryImpl	query

Constructor Summary

Constructors

Constructor and Description
PropertyExistenceImpl(SelectorImpl selector, String selectorName, String propertyName)
PropertyExistenceImpl(String selectorName, String propertyName)

Method Summary

Modifier and Type	Method and Description
void	bindSelector(SourceImpl source)
protected PropertyValue	convertValueToType(PropertyValue v, PropertyValue targetType)
org.apache.jackrabbit.oak.query.ast.AstElement	copyOf()
boolean	equals(Object obj)
boolean	evaluate() Evaluate the result using the currently set values.
protected String	getLocalPath(String path) Calculate the session local path (the path excluding the workspace name) if possible.
Set<PropertyExistenceImpl>	getPropertyExistenceConditions() Get the set of property existence conditions that can be derived for this condition.
Set<SelectorImpl>	getSelectors() Get the set of selectors for the given condition.
int	hashCode()
protected String	normalizePath(String path) Validate and normalize the path.
protected String	normalizePropertyName(String propertyName) Normalize the property name (including namespace remapping).
protected String	protect(Object expression)
protected String	quote(String pathOrName)
protected String	quoteJson(String string)
void	restrict(FilterImpl f) Apply the condition to the filter, further restricting the filter if possible.
void	restrictPushDown(SelectorImpl s) Push as much of the condition down to this selector, further restricting the selector condition if possible.
void	setQuery(QueryImpl query)
String	toString()

Methods inherited from class org.apache.jackrabbit.oak.query.ast.ConstraintImpl

containsUnfilteredFullTextCondition, convertToUnion, evaluateStop, getFullTextConstraint, requiresFullTextIndex, simplify

Methods inherited from class java.lang.Object

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

Field Detail

query

protected QueryImpl query

Constructor Detail

PropertyExistenceImpl

public PropertyExistenceImpl(SelectorImpl selector,
                             String selectorName,
                             String propertyName)

PropertyExistenceImpl

public PropertyExistenceImpl(String selectorName,
                             String propertyName)

Method Detail

evaluate

public boolean evaluate()

Description copied from class: ConstraintImpl

Evaluate the result using the currently set values.

Specified by:

evaluate in class ConstraintImpl

Returns:

true if the constraint matches

getPropertyExistenceConditions

public Set<PropertyExistenceImpl> getPropertyExistenceConditions()

Description copied from class: ConstraintImpl

Get the set of property existence conditions that can be derived for this condition. For example, for the condition "x=1 or x=2", the property existence condition is "x is not null". For the condition "x=1 or y=2", there is no such condition. For the condition "x=1 and y=1", there are two (x is not null, and y is not null).

Specified by:

getPropertyExistenceConditions in class ConstraintImpl

Returns:

the common property existence condition (possibly empty)

getSelectors

public Set<SelectorImpl> getSelectors()

Description copied from class: ConstraintImpl

Get the set of selectors for the given condition.

Specified by:

getSelectors in class ConstraintImpl

Returns:

the set of selectors (possibly empty)

toString

public String toString()

Overrides:

toString in class Object

bindSelector

public void bindSelector(SourceImpl source)

restrict

public void restrict(FilterImpl f)

Description copied from class: ConstraintImpl

Apply the condition to the filter, further restricting the filter if possible. This may also verify the data types are compatible, and that paths are valid.

Specified by:

restrict in class ConstraintImpl

Parameters:

f - the filter

restrictPushDown

public void restrictPushDown(SelectorImpl s)

Description copied from class: ConstraintImpl

Push as much of the condition down to this selector, further restricting the selector condition if possible. This is important for a join: for example, the query "select * from a inner join b on a.x=b.x where a.y=1 and b.y=1", the condition "a.y=1" can be pushed down to "a", and the condition "b.y=1" can be pushed down to "b". That means it is possible to use an index in this case.

Specified by:

restrictPushDown in class ConstraintImpl

Parameters:

s - the selector

hashCode

public int hashCode()

Overrides:

hashCode in class ConstraintImpl

equals

public boolean equals(Object obj)

Overrides:

equals in class ConstraintImpl

copyOf

public org.apache.jackrabbit.oak.query.ast.AstElement copyOf()

Returns:

a clone of self. Default implementation in AstElement returns same reference to this.

protect

protected String protect(Object expression)

quote

protected String quote(String pathOrName)

quoteJson

protected String quoteJson(String string)

setQuery

public void setQuery(QueryImpl query)

normalizePropertyName

protected String normalizePropertyName(String propertyName)

Normalize the property name (including namespace remapping). Asterisks are kept.

Parameters:

propertyName - the property name to normalize

Returns:

the normalized (oak-) property name

normalizePath

protected String normalizePath(String path)

Validate and normalize the path.

Parameters:

path - the path to validate

Returns:

the validated and normalized path

convertValueToType

protected PropertyValue convertValueToType(PropertyValue v,
                                           PropertyValue targetType)

getLocalPath

protected String getLocalPath(String path)

Calculate the session local path (the path excluding the workspace name) if possible.

Parameters:

path - the absolute path

Returns:

the session local path, or null if not within this workspace