org.apache.jackrabbit.oak.query.ast

Class JoinConditionImpl

java.lang.Object

org.apache.jackrabbit.oak.query.ast.JoinConditionImpl

Direct Known Subclasses:

ChildNodeJoinConditionImpl, DescendantNodeJoinConditionImpl, EquiJoinConditionImpl, SameNodeJoinConditionImpl

public abstract class JoinConditionImpl
extends java.lang.Object

The base class for join conditions.

Field Summary

Fields

Modifier and Type	Field and Description
protected static java.lang.String	KNOWN_PARENT_PATH The parent path of the joined selector
protected static java.lang.String	KNOWN_PATH A path for a join.
protected static java.lang.String	KNOWN_VALUE
protected QueryImpl	query
static java.lang.String	SPECIAL_PATH_PREFIX The prefix for known paths.

Constructor Summary

Constructors

Constructor and Description
JoinConditionImpl()

Method Summary

Modifier and Type	Method and Description
abstract boolean	canEvaluate(java.util.Set<SourceImpl> available) Whether the join condition can be evaluated if the given selectors are able to retrieve data.
protected PropertyValue	convertValueToType(PropertyValue v, PropertyValue targetType)
@NotNull org.apache.jackrabbit.oak.query.ast.AstElement	copyOf()
abstract boolean	evaluate() Evaluate the result using the currently set values.
protected java.lang.String	getLocalPath(java.lang.String path) Calculate the session local path (the path excluding the workspace name) if possible.
abstract boolean	isParent(SourceImpl source) Check whether the given source is the parent of the join condition, as selector "[b]" is the parent of the join condition "isdescendantnode([a], [b])".
protected java.lang.String	normalizePath(java.lang.String path) Validate and normalize the path.
protected java.lang.String	normalizePropertyName(java.lang.String propertyName) Normalize the property name (including namespace remapping).
protected java.lang.String	protect(java.lang.Object expression)
protected java.lang.String	quote(java.lang.String pathOrName)
protected java.lang.String	quoteJson(java.lang.String string)
abstract void	restrict(FilterImpl f) Apply the condition to the filter, further restricting the filter if possible.
abstract 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)

Methods inherited from class java.lang.Object

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

Field Detail

SPECIAL_PATH_PREFIX

public static final java.lang.String SPECIAL_PATH_PREFIX

The prefix for known paths.

See Also:

Constant Field Values

KNOWN_PATH

protected static final java.lang.String KNOWN_PATH

A path for a join.

See Also:

Constant Field Values

KNOWN_PARENT_PATH

protected static final java.lang.String KNOWN_PARENT_PATH

The parent path of the joined selector

See Also:

Constant Field Values

KNOWN_VALUE

protected static final java.lang.String KNOWN_VALUE

See Also:

Constant Field Values

query

protected QueryImpl query

Constructor Detail

JoinConditionImpl

public JoinConditionImpl()

Method Detail

evaluate

public abstract boolean evaluate()

Evaluate the result using the currently set values.

Returns:

true if the constraint matches

restrict

public abstract void restrict(FilterImpl f)

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.

Parameters:

f - the filter

restrictPushDown

public abstract void restrictPushDown(SelectorImpl s)

Push as much of the condition down to this selector, further restricting the selector condition if possible.

Parameters:

s - the selector

isParent

public abstract boolean isParent(SourceImpl source)

Check whether the given source is the parent of the join condition, as selector "[b]" is the parent of the join condition "isdescendantnode([a], [b])".

Parameters:

source - the source

Returns:

true if the source is the parent

canEvaluate

public abstract boolean canEvaluate(java.util.Set<SourceImpl> available)

Whether the join condition can be evaluated if the given selectors are able to retrieve data.

Parameters:

available - the available selectors

Returns:

true if the condition can be evaluated

protect

protected java.lang.String protect(java.lang.Object expression)

quote

protected java.lang.String quote(java.lang.String pathOrName)

quoteJson

protected java.lang.String quoteJson(java.lang.String string)

setQuery

public void setQuery(QueryImpl query)

normalizePropertyName

protected java.lang.String normalizePropertyName(java.lang.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 java.lang.String normalizePath(java.lang.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 java.lang.String getLocalPath(java.lang.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

copyOf

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

Returns:

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