org.modeshape.jcr.cache

Interface ChildReferences

All Superinterfaces:

Iterable<ChildReference>

All Known Implementing Classes:

AbstractChildReferences, ImmutableChildReferences.EmptyChildReferences, ImmutableChildReferences.Medium, ImmutableChildReferences.ReferencesUnion, ImmutableChildReferences.Segmented, MutableChildReferences, SessionChildReferences

@Immutable
public interface ChildReferences
extends Iterable<ChildReference>

An interface used to access the ChildReference instances owned by a parent node.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	ChildReferences.BasicContext A ChildReferences.Context implementation that has no changes but maintains the SNS indexes for nodes with any name.
static interface	ChildReferences.Changes The representation of a set of changes for the child references.
static interface	ChildReferences.ChildInsertions A representation of the child references that were inserted before some other node.
static interface	ChildReferences.Context The context in which the names are evaluated.
static class	ChildReferences.NoChanges
static class	ChildReferences.NoContext A ChildReferences.Changes implementation that has no changes and that is useful when there are never any siblings with the same names, since it always returns '1' for the SNS index.
static class	ChildReferences.NoSnsIndexesContext A ChildReferences.Context implementation that has no changes and that always returns '1' for the SNS index.
static class	ChildReferences.SingleNameContext A ChildReferences.Context implementation that has no changes and can be used to find the SNS indexes for nodes named a single name.
static class	ChildReferences.WithChanges A ChildReferences.Context implementation that has changes and can be used to find the SNS indexes for nodes named a single name.

Field Summary

Fields

Modifier and Type	Field and Description
static long	UNKNOWN_SIZE A constant that might be returned by size() if the number of child references is unknown.

Method Summary

Modifier and Type	Method and Description
boolean	allowsSNS() Determine if the child references instance should support SNS or not.
Iterator<NodeKey>	getAllKeys() Get the keys for all of the children.
ChildReference	getChild(Name name) Look for the child reference that has the given name and a SNS index of '1'.
ChildReference	getChild(Name name, int snsIndex) Look for the child reference that has the given name and SNS index.
ChildReference	getChild(Name name, int snsIndex, ChildReferences.Context context) Look for the child reference that has the given name and SNS index.
ChildReference	getChild(NodeKey key) Look for the child reference that has the node key.
ChildReference	getChild(NodeKey key, ChildReferences.Context context) Look for the child reference that has the node key.
ChildReference	getChild(Path.Segment segment) Look for the child reference that has the given name and SNS index.
int	getChildCount(Name name) Return the number of nodes that have the supplied name.
boolean	hasChild(NodeKey key) Determine if this contains a reference to the specified child.
boolean	isEmpty() Determine if there are no references in this container.
Iterator<ChildReference>	iterator() Get an iterator over all of the children.
Iterator<ChildReference>	iterator(ChildReferences.Context context) Get an iterator over all child references in this collection, using the supplied context.
Iterator<ChildReference>	iterator(ChildReferences.Context context, Collection<?> namePatterns, NamespaceRegistry registry) Get an iterator over all of the children that have names (excluding same-name-sibling indexes) matching at least one of the supplied patterns, using the supplied context.
Iterator<ChildReference>	iterator(Collection<?> namePatterns, NamespaceRegistry registry) Get an iterator over all of the children that have names (excluding same-name-sibling indexes) matching at least one of the supplied patterns.
Iterator<ChildReference>	iterator(Name name) Get an iterator over all of the children that have same name matching the supplied value.
Iterator<ChildReference>	iterator(Name name, ChildReferences.Context context) Get an iterator over all of the children that have same name matching the supplied value.
long	size() Get the total number of child references for the node, including all subsequent blocks of ChildReferences.
boolean	supportsGetChildReferenceByKey() Return whether it is possible/feasible to find a ChildReference for a child node given only its NodeKey.

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

UNKNOWN_SIZE

static final long UNKNOWN_SIZE

A constant that might be returned by size() if the number of child references is unknown.

See Also:

Constant Field Values

Method Detail

size

long size()

Get the total number of child references for the node, including all subsequent blocks of ChildReferences.

Returns:

the total number of children, or UNKNOWN_SIZE

isEmpty

boolean isEmpty()

Determine if there are no references in this container. This is equivalent to calling size() == 0 but may be faster.

Returns:

true if there are no references in this container, or false if there are.

getChildCount

int getChildCount(Name name)

Return the number of nodes that have the supplied name. If there are no siblings with the same supplied name, this method will return 1; otherwise it will return the number of same-name-siblings.

Parameters:

name - the name

Returns:

the number of siblings with the supplied name; never negative

getChild

ChildReference getChild(Name name)

Look for the child reference that has the given name and a SNS index of '1'.

Parameters:

name - the name for the node

Returns:

the child reference, or null if there is no such child

getChild

ChildReference getChild(Name name,
                        int snsIndex)

Look for the child reference that has the given name and SNS index.

Parameters:

name - the name for the node

snsIndex - the same-name-sibling index; must be positive

Returns:

the child reference, or null if there is no such child

getChild

ChildReference getChild(Name name,
                        int snsIndex,
                        ChildReferences.Context context)

Look for the child reference that has the given name and SNS index.

Parameters:

name - the name for the node

snsIndex - the same-name-sibling index; must be positive

context - the context in which the child should be evaluated; may be null if there is no context

Returns:

the child reference, or null if there is no such child

getChild

ChildReference getChild(Path.Segment segment)

Look for the child reference that has the given name and SNS index.

Parameters:

segment - the path segment, which defines the name and SNS index

Returns:

the child reference, or null if there is no such child

hasChild

boolean hasChild(NodeKey key)

Determine if this contains a reference to the specified child.

Parameters:

key - the node key of the child

Returns:

true if there is a child reference, or false if there is none

getChild

ChildReference getChild(NodeKey key)

Look for the child reference that has the node key.

Parameters:

key - the node key of the child

Returns:

the child reference, or null if there is no such child

getChild

ChildReference getChild(NodeKey key,
                        ChildReferences.Context context)

Look for the child reference that has the node key.

Parameters:

key - the node key of the child

context - the context in which the child should be evaluated; may be null if there is no context

Returns:

the child reference, or null if there is no such child

supportsGetChildReferenceByKey

boolean supportsGetChildReferenceByKey()

Return whether it is possible/feasible to find a ChildReference for a child node given only its NodeKey. Implementations that have very large numbers of children may provide an alternative way to lookup a child reference directly. In such cases, this method may return false.

Returns:

true if getChild(NodeKey) and getChild(NodeKey, Context) should be used to find the ChildReference, or false if doing so is not recommended.

iterator

Iterator<ChildReference> iterator(Name name)

Get an iterator over all of the children that have same name matching the supplied value. This essentially returns an iterator over all of the same-name-siblings.

Parameters:

name - the name of the same-name-sibling nodes; may not be null

Returns:

the iterator; never null

iterator

Iterator<ChildReference> iterator(Name name,
                                  ChildReferences.Context context)

Get an iterator over all of the children that have same name matching the supplied value. This essentially returns an iterator over all of the same-name-siblings.

Parameters:

name - the name of the same-name-sibling nodes; may not be null

context - the context in which the child should be evaluated; may be null if there is no context

Returns:

the iterator; never null

iterator

Iterator<ChildReference> iterator()

Get an iterator over all of the children.

Specified by:

iterator in interface Iterable<ChildReference>

Returns:

the iterator; never null

iterator

Iterator<ChildReference> iterator(Collection<?> namePatterns,
                                  NamespaceRegistry registry)

Get an iterator over all of the children that have names (excluding same-name-sibling indexes) matching at least one of the supplied patterns.

Parameters:

namePatterns - the list of string literals or regex patterns describing the names

registry - the namespace registry, used to convert names to a form compatible with the name patterns

Returns:

the iterator; never null

iterator

Iterator<ChildReference> iterator(ChildReferences.Context context)

Get an iterator over all child references in this collection, using the supplied context.

Parameters:

context - the context in which the child should be evaluated; may be null if there is no context

Returns:

the iterator over all references; never null

iterator

Iterator<ChildReference> iterator(ChildReferences.Context context,
                                  Collection<?> namePatterns,
                                  NamespaceRegistry registry)

Get an iterator over all of the children that have names (excluding same-name-sibling indexes) matching at least one of the supplied patterns, using the supplied context. The resulting iterator is lazy where possible, but it may be an expensive call if there are large numbers of children.

Parameters:

context - the context in which the child should be evaluated; may be null if there is no context

namePatterns - the list of string literals or regex patterns describing the names

registry - the namespace registry, used to convert names to a form compatible with the name patterns

Returns:

the iterator; never null

allowsSNS

boolean allowsSNS()

Determine if the child references instance should support SNS or not.

Returns:

true if the child reference instance supports SNS

getAllKeys

Iterator<NodeKey> getAllKeys()

Get the keys for all of the children. The resulting iterator is lazy where possible, but it may be an expensive call if there are large numbers of children.

Returns:

the iterator over the keys; never null