java.lang.Object
- org.apache.cayenne.query.PrefetchTreeNode

All Implemented Interfaces:

Serializable, XMLSerializable
```
public class PrefetchTreeNode
extends Object
implements Serializable, XMLSerializable
```
Defines a node in a prefetch tree.

Since:

1.2

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`protected Collection<PrefetchTreeNode>`	`children`
`static int`	`DISJOINT_BY_ID_PREFETCH_SEMANTICS`
`static int`	`DISJOINT_PREFETCH_SEMANTICS`
`protected String`	`ejbqlPathEntityId`
`protected String`	`entityName`
`static int`	`JOINT_PREFETCH_SEMANTICS`
`protected String`	`name`
`protected PrefetchTreeNode`	`parent`
`protected boolean`	`phantom`
`protected int`	`semantics`
`static int`	`UNDEFINED_SEMANTICS`

Constructor Summary

Constructors
Modifier	Constructor	Description
	`PrefetchTreeNode()`	Creates a root node of the prefetch tree.
`protected`	`PrefetchTreeNode(PrefetchTreeNode parent, String name)`	Creates a phantom PrefetchTreeNode, initializing it with parent node and a name of a relationship segment connecting this node with the parent.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addChild(PrefetchTreeNode child)`
`PrefetchTreeNode`	`addPath(String path)`	Adds a "path" with specified semantics to this prefetch node.
`Collection<PrefetchTreeNode>`	`adjacentJointNodes()`	Returns a subset of nodes with "joint" semantics that are to be prefetched in the same query as the current node.
`PrefetchTreeNode`	`cloneJointSubtree()`	Returns a clone of subtree that includes all joint children starting from this node itself and till the first occurrence of non-joint node
`Collection<PrefetchTreeNode>`	`disjointByIdNodes()`	Returns a collection of PrefetchTreeNodes with disjoint semantics
`Collection<PrefetchTreeNode>`	`disjointNodes()`	Returns a collection of PrefetchTreeNodes with disjoint semantics.
`void`	`encodeAsXML(XMLEncoder encoder, ConfigurationNodeVisitor delegate)`	Prints itself as XML to the provided XMLEncoder.
`protected PrefetchTreeNode`	`getChild(String segment)`
`Collection<PrefetchTreeNode>`	`getChildren()`	Returns an unmodifiable collection of children.
`String`	`getEjbqlPathEntityId()`
`String`	`getEntityName()`
`String`	`getName()`
`PrefetchTreeNode`	`getNode(String path)`	Looks up an existing node in the tree desribed by the dot-separated path.
`PrefetchTreeNode`	`getParent()`
`String`	`getPath()`	Returns full prefetch path, that is a dot separated String of node names starting from root and up to and including this node.
`String`	`getPath(PrefetchTreeNode upTillParent)`
`PrefetchTreeNode`	`getRoot()`	Returns the root of the node tree.
`int`	`getSemantics()`
`boolean`	`hasChildren()`
`boolean`	`isDisjointByIdPrefetch()`
`boolean`	`isDisjointPrefetch()`
`boolean`	`isJointPrefetch()`
`boolean`	`isPhantom()`
`Collection<PrefetchTreeNode>`	`jointNodes()`	Returns a collection of PrefetchTreeNodes in this tree with joint semantics.
`void`	`merge(PrefetchTreeNode node)`	Merges `PrefetchTreeNode` into the current prefetch tree, cloning the nodes added to this tree.
`Collection<PrefetchTreeNode>`	`nonPhantomNodes()`	Returns a collection of PrefetchTreeNodes that are not phantoms.
`protected Object`	`readResolve()`
`protected void`	`removeChild(String segment)`
`void`	`removeChild(PrefetchTreeNode child)`
`void`	`removePath(String path)`	Removes or makes phantom a node defined by this path.
`void`	`setEjbqlPathEntityId(String ejbqlPathEntityId)`
`void`	`setEntityName(String entityName)`
`void`	`setPhantom(boolean phantom)`
`void`	`setSemantics(int semantics)`
`void`	`traverse(PrefetchProcessor processor)`	Traverses the tree depth-first, invoking callback methods of the processor when passing through the nodes.
`static PrefetchTreeNode`	`withPath(String path, int semantics)`	Creates and returns a prefetch tree spanning a single path.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - UNDEFINED_SEMANTICS
```
public static final int UNDEFINED_SEMANTICS
```
    See Also:
    
    Constant Field Values
  - JOINT_PREFETCH_SEMANTICS
```
public static final int JOINT_PREFETCH_SEMANTICS
```
    See Also:
    
    Constant Field Values
  - DISJOINT_PREFETCH_SEMANTICS
```
public static final int DISJOINT_PREFETCH_SEMANTICS
```
    See Also:
    
    Constant Field Values
  - DISJOINT_BY_ID_PREFETCH_SEMANTICS
```
public static final int DISJOINT_BY_ID_PREFETCH_SEMANTICS
```
    See Also:
    
    Constant Field Values
  - name
```
protected String name
```
  - phantom
```
protected boolean phantom
```
  - semantics
```
protected int semantics
```
  - ejbqlPathEntityId
```
protected String ejbqlPathEntityId
```
  - entityName
```
protected String entityName
```
  - parent
```
protected transient PrefetchTreeNode parent
```
  - children
```
protected Collection<PrefetchTreeNode> children
```
- Constructor Detail
  - PrefetchTreeNode
```
public PrefetchTreeNode()
```
    Creates a root node of the prefetch tree. Children can be added to the parent by calling "addPath".
  - PrefetchTreeNode
```
protected PrefetchTreeNode(PrefetchTreeNode parent,
                           String name)
```
    Creates a phantom PrefetchTreeNode, initializing it with parent node and a name of a relationship segment connecting this node with the parent.
- Method Detail
  - withPath
```
public static PrefetchTreeNode withPath(String path,
                                        int semantics)
```
    Creates and returns a prefetch tree spanning a single path. The tree is made of phantom nodes, up to the leaf node, which is non-phantom and has specified semantics.
    
    Since:
    
    4.0
  - encodeAsXML
```
public void encodeAsXML(XMLEncoder encoder,
                        ConfigurationNodeVisitor delegate)
```
    Description copied from interface: XMLSerializable
    
    Prints itself as XML to the provided XMLEncoder.
    
    Specified by:
    
    encodeAsXML in interface XMLSerializable
  - getRoot
```
public PrefetchTreeNode getRoot()
```
    Returns the root of the node tree. Root is the topmost parent node that itself has no parent set.
  - getPath
```
public String getPath()
```
    Returns full prefetch path, that is a dot separated String of node names starting from root and up to and including this node. Note that root "name" is considered to be an empty string.
  - getPath
```
public String getPath(PrefetchTreeNode upTillParent)
```
  - adjacentJointNodes
```
public Collection<PrefetchTreeNode> adjacentJointNodes()
```
    Returns a subset of nodes with "joint" semantics that are to be prefetched in the same query as the current node. Result excludes this node, regardless of its semantics.
  - jointNodes
```
public Collection<PrefetchTreeNode> jointNodes()
```
    Returns a collection of PrefetchTreeNodes in this tree with joint semantics.
  - disjointNodes
```
public Collection<PrefetchTreeNode> disjointNodes()
```
    Returns a collection of PrefetchTreeNodes with disjoint semantics.
  - disjointByIdNodes
```
public Collection<PrefetchTreeNode> disjointByIdNodes()
```
    Returns a collection of PrefetchTreeNodes with disjoint semantics
    
    Since:
    
    3.1
  - nonPhantomNodes
```
public Collection<PrefetchTreeNode> nonPhantomNodes()
```
    Returns a collection of PrefetchTreeNodes that are not phantoms.
  - cloneJointSubtree
```
public PrefetchTreeNode cloneJointSubtree()
```
    Returns a clone of subtree that includes all joint children starting from this node itself and till the first occurrence of non-joint node
    
    Since:
    
    3.1
  - traverse
```
public void traverse(PrefetchProcessor processor)
```
    Traverses the tree depth-first, invoking callback methods of the processor when passing through the nodes.
  - getNode
```
public PrefetchTreeNode getNode(String path)
```
    Looks up an existing node in the tree desribed by the dot-separated path. Will return null if no matching child exists.
  - addPath
```
public PrefetchTreeNode addPath(String path)
```
    Adds a "path" with specified semantics to this prefetch node. All yet non-existent nodes in the created path will be marked as phantom.
    
    Returns:
    
    the last segment in the created path.
  - merge
```
public void merge(PrefetchTreeNode node)
```
    Merges PrefetchTreeNode into the current prefetch tree, cloning the nodes added to this tree. Merged nodes semantics (if defined) and non-phantom status are applied to the nodes of this tree.
    
    Parameters:
    
    node - a root node of a tree to merge into this tree. The path of the merged node within the resulting tree is determined from its name.
    
    Since:
    
    4.0
  - removePath
```
public void removePath(String path)
```
    Removes or makes phantom a node defined by this path. If the node for this path doesn't have any children, it is removed, otherwise it is made phantom.
  - addChild
```
public void addChild(PrefetchTreeNode child)
```
  - removeChild
```
public void removeChild(PrefetchTreeNode child)
```
  - removeChild
```
protected void removeChild(String segment)
```
  - getChild
```
protected PrefetchTreeNode getChild(String segment)
```
  - getParent
```
public PrefetchTreeNode getParent()
```
  - getChildren
```
public Collection<PrefetchTreeNode> getChildren()
```
    Returns an unmodifiable collection of children.
  - hasChildren
```
public boolean hasChildren()
```
  - getName
```
public String getName()
```
  - isPhantom
```
public boolean isPhantom()
```
  - setPhantom
```
public void setPhantom(boolean phantom)
```
  - getSemantics
```
public int getSemantics()
```
  - setSemantics
```
public void setSemantics(int semantics)
```
  - isJointPrefetch
```
public boolean isJointPrefetch()
```
  - isDisjointPrefetch
```
public boolean isDisjointPrefetch()
```
  - isDisjointByIdPrefetch
```
public boolean isDisjointByIdPrefetch()
```
  - getEjbqlPathEntityId
```
public String getEjbqlPathEntityId()
```
  - setEjbqlPathEntityId
```
public void setEjbqlPathEntityId(String ejbqlPathEntityId)
```
  - getEntityName
```
public String getEntityName()
```
  - setEntityName
```
public void setEntityName(String entityName)
```
  - readResolve
```
protected Object readResolve()
                      throws ObjectStreamException
```
    Throws:
    
    ObjectStreamException

Class PrefetchTreeNode

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

UNDEFINED_SEMANTICS

JOINT_PREFETCH_SEMANTICS

DISJOINT_PREFETCH_SEMANTICS

DISJOINT_BY_ID_PREFETCH_SEMANTICS

name

phantom

semantics

ejbqlPathEntityId

entityName

parent

children

Constructor Detail

PrefetchTreeNode

PrefetchTreeNode

Method Detail

withPath

encodeAsXML

getRoot

getPath

getPath

adjacentJointNodes

jointNodes

disjointNodes

disjointByIdNodes

nonPhantomNodes

cloneJointSubtree

traverse

getNode

addPath

merge

removePath

addChild

removeChild

removeChild

getChild

getParent

getChildren

hasChildren

getName

isPhantom

setPhantom

getSemantics

setSemantics

isJointPrefetch

isDisjointPrefetch

isDisjointByIdPrefetch

getEjbqlPathEntityId

setEjbqlPathEntityId

getEntityName

setEntityName

readResolve