Package org.apache.commons.jxpath.ri.model.beans

Class NullPropertyPointer

java.lang.Object

org.apache.commons.jxpath.ri.model.NodePointer

org.apache.commons.jxpath.ri.model.beans.PropertyPointer

org.apache.commons.jxpath.ri.model.beans.NullPropertyPointer

All Implemented Interfaces:

Serializable, Cloneable, Comparable, Pointer

public class NullPropertyPointer
extends PropertyPointer

Pointer to a null property.

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.apache.commons.jxpath.ri.model.beans.PropertyPointer

bean, propertyIndex, UNSPECIFIED_PROPERTY

Fields inherited from class org.apache.commons.jxpath.ri.model.NodePointer

index, locale, parent, UNKNOWN_NAMESPACE, WHOLE_COLLECTION

Constructor Summary

Constructors

Constructor	Description
NullPropertyPointer(NodePointer parent)	Constructs a new NullPropertyPointer.

Method Summary

Modifier and Type	Method	Description
String	asPath()	Returns an XPath that maps to this Pointer.
NodePointer	createChild(JXPathContext context, QName qName, int index)	Called by a child pointer when it needs to create a parent object for a non-existent collection element.
NodePointer	createChild(JXPathContext context, QName qName, int index, Object value)	Called by a child pointer if that child needs to assign the value supplied in the createPath(context, value) call to a non-existent node.
NodePointer	createPath(JXPathContext context)	Called by a child pointer when it needs to create a parent object.
NodePointer	createPath(JXPathContext context, Object value)	Called directly by JXPathContext.
Object	getBaseValue()	Gets the value represented by the pointer before indexing.
Object	getImmediateNode()	Returns the object the pointer points to; does not convert it to a "canonical" type.
int	getLength()	If the property contains a collection, then the length of that collection, otherwise - 1.
QName	getName()	Gets the name of this node.
int	getPropertyCount()	Count the number of properties represented.
String	getPropertyName()	Gets the property name.
String[]	getPropertyNames()	Gets the names of the included properties.
NodePointer	getValuePointer()	If this pointer manages a transparent container, like a variable, this method returns the pointer to the contents.
boolean	isActual()	An actual pointer points to an existing part of an object graph, even if it is null.
protected boolean	isActualProperty()	Tests whether this pointer references an actual property.
boolean	isCollection()	Returns true if the value of the pointer is an array or a Collection.
boolean	isContainer()	If true, this node is auxiliary and can only be used as an intermediate in the chain of pointers.
boolean	isLeaf()	If true, this node does not have children
void	setNameAttributeValue(String attributeValue)	Sets the name attribute.
void	setPropertyIndex(int index)	Sets the property index.
void	setPropertyName(String propertyName)	Sets the property name.
void	setValue(Object value)	Converts the value to the required type and changes the corresponding object to that value.

Methods inherited from class org.apache.commons.jxpath.ri.model.beans.PropertyPointer

compareChildNodePointers, equals, getBean, getImmediateValuePointer, getPropertyIndex, hashCode

Methods inherited from class org.apache.commons.jxpath.ri.model.NodePointer

attributeIterator, childIterator, clone, compareTo, createAttribute, escape, getAbstractFactory, getDefaultNamespaceURI, getImmediateParentPointer, getIndex, getLocale, getNamespaceResolver, getNamespaceURI, getNamespaceURI, getNode, getNodeSetByKey, getNodeValue, getParent, getPointerByID, getPointerByKey, getRootNode, getValue, handle, handle, isAttribute, isDefaultNamespace, isLanguage, isNode, isRoot, namespaceIterator, namespacePointer, newChildNodePointer, newNodePointer, printPointerChain, remove, setAttribute, setExceptionHandler, setIndex, setNamespaceResolver, testNode, toString, verify

Methods inherited from class java.lang.Object

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

Constructor Details

NullPropertyPointer

public NullPropertyPointer(NodePointer parent)

Constructs a new NullPropertyPointer.

Parameters:

parent - pointer

Method Details

asPath

public String asPath()

Description copied from class: NodePointer

Returns an XPath that maps to this Pointer.

Specified by:

asPath in interface Pointer

Overrides:

asPath in class NodePointer

Returns:

String XPath expression

createChild

public NodePointer createChild(JXPathContext context,
 QName qName,
 int index)

Description copied from class: NodePointer

Called by a child pointer when it needs to create a parent object for a non-existent collection element. It may have to expand the collection, then create an element object and return a new pointer describing the newly created element.

Overrides:

createChild in class PropertyPointer

Parameters:

context - the owning JXPathCOntext

qName - the QName at which a child should be created

index - child index.

Returns:

created NodePointer

createChild

public NodePointer createChild(JXPathContext context,
 QName qName,
 int index,
 Object value)

Description copied from class: NodePointer

Called by a child pointer if that child needs to assign the value supplied in the createPath(context, value) call to a non-existent node. This method may have to expand the collection in order to assign the element.

Overrides:

createChild in class PropertyPointer

Parameters:

context - the owning JXPathCOntext

qName - the QName at which a child should be created

index - child index.

value - node value to set

Returns:

created NodePointer

createPath

public NodePointer createPath(JXPathContext context)

Description copied from class: NodePointer

Called by a child pointer when it needs to create a parent object. Must create an object described by this pointer and return a new pointer that properly describes the new object.

Overrides:

createPath in class PropertyPointer

Parameters:

context - the owning JXPathContext

Returns:

created NodePointer

createPath

public NodePointer createPath(JXPathContext context,
 Object value)

Description copied from class: NodePointer

Called directly by JXPathContext. Must create path and set value.

Overrides:

createPath in class PropertyPointer

Parameters:

context - the owning JXPathContext

value - the new value to set

Returns:

created NodePointer

getBaseValue

public Object getBaseValue()

Description copied from class: NodePointer

Gets the value represented by the pointer before indexing. So, if the node represents an element of a collection, this method returns the collection itself.

Specified by:

getBaseValue in class NodePointer

Returns:

Object value

getImmediateNode

public Object getImmediateNode()

Description copied from class: NodePointer

Returns the object the pointer points to; does not convert it to a "canonical" type.

Overrides:

getImmediateNode in class PropertyPointer

Returns:

Object node

getLength

public int getLength()

Description copied from class: PropertyPointer

If the property contains a collection, then the length of that collection, otherwise - 1.

Overrides:

getLength in class PropertyPointer

Returns:

int length

getName

public QName getName()

Description copied from class: NodePointer

Gets the name of this node. Can be null.

Overrides:

getName in class PropertyPointer

Returns:

QName The name of this node. Can be null.

getPropertyCount

public int getPropertyCount()

Description copied from class: PropertyPointer

Count the number of properties represented.

Specified by:

getPropertyCount in class PropertyPointer

Returns:

int

getPropertyName

public String getPropertyName()

Description copied from class: PropertyPointer

Gets the property name.

Specified by:

getPropertyName in class PropertyPointer

Returns:

String property name.

getPropertyNames

public String[] getPropertyNames()

Description copied from class: PropertyPointer

Gets the names of the included properties.

Specified by:

getPropertyNames in class PropertyPointer

Returns:

String[]

getValuePointer

public NodePointer getValuePointer()

Description copied from class: NodePointer

If this pointer manages a transparent container, like a variable, this method returns the pointer to the contents. Only an auxiliary (non-node) pointer can (and should) return a value pointer other than itself. Note that you probably don't want to override getValuePointer() directly. Override the getImmediateValuePointer() method instead. The getValuePointer() method is calls getImmediateValuePointer() and, if the result is not this, invokes getValuePointer() recursively. The idea here is to open all nested containers. Let's say we have a container within a container within a container. The getValuePointer() method should then open all those containers and return the pointer to the ultimate contents. It does so with the above recursion.

Overrides:

getValuePointer in class NodePointer

Returns:

NodePointer

isActual

public boolean isActual()

Description copied from class: NodePointer

An actual pointer points to an existing part of an object graph, even if it is null. A non-actual pointer represents a part that does not exist at all. For instance consider the pointer "/address/street". If both address and street are not null, the pointer is actual. If address is not null, but street is null, the pointer is still actual. If address is null, the pointer is not actual. (In JavaBeans) if address is not a property of the root bean, a Pointer for this path cannot be obtained at all - actual or otherwise.

Overrides:

isActual in class PropertyPointer

Returns:

boolean

isActualProperty

protected boolean isActualProperty()

Description copied from class: PropertyPointer

Tests whether this pointer references an actual property.

Specified by:

isActualProperty in class PropertyPointer

Returns:

true if actual

isCollection

public boolean isCollection()

Description copied from class: NodePointer

Returns true if the value of the pointer is an array or a Collection.

Overrides:

isCollection in class PropertyPointer

Returns:

boolean

isContainer

public boolean isContainer()

Description copied from class: NodePointer

If true, this node is auxiliary and can only be used as an intermediate in the chain of pointers.

Overrides:

isContainer in class NodePointer

Returns:

boolean

isLeaf

public boolean isLeaf()

Description copied from class: NodePointer

If true, this node does not have children

Overrides:

isLeaf in class PropertyPointer

Returns:

boolean

setNameAttributeValue

public void setNameAttributeValue(String attributeValue)

Sets the name attribute.

Parameters:

attributeValue - value to set

setPropertyIndex

public void setPropertyIndex(int index)

Description copied from class: PropertyPointer

Sets the property index.

Overrides:

setPropertyIndex in class PropertyPointer

Parameters:

index - property index

setPropertyName

public void setPropertyName(String propertyName)

Description copied from class: PropertyPointer

Sets the property name.

Specified by:

setPropertyName in class PropertyPointer

Parameters:

propertyName - property name to set.

setValue

public void setValue(Object value)

Description copied from class: NodePointer

Converts the value to the required type and changes the corresponding object to that value.

Specified by:

setValue in interface Pointer

Specified by:

setValue in class NodePointer

Parameters:

value - the value to set