Class NodePointer
java.lang.Object
org.apache.commons.jxpath.ri.model.NodePointer
- All Implemented Interfaces:
Serializable
,Cloneable
,Comparable
,Pointer
- Direct Known Subclasses:
CollectionPointer
,ContainerPointer
,DOMAttributePointer
,DOMNodePointer
,JDOMAttributePointer
,JDOMNamespacePointer
,JDOMNodePointer
,LangAttributePointer
,NamespacePointer
,PropertyOwnerPointer
,PropertyPointer
,VariablePointer
Common superclass for Pointers of all kinds. A NodePointer maps to a deterministic XPath that represents the location of a node in an object graph. This
XPath uses only simple axes: child, namespace and attribute and only simple, context-independent predicates.
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected int
Index for this NodePointer.protected Locale
Localeprotected NodePointer
Parent pointerstatic final String
Constant to indicate unknown namespacestatic final int
Whole collection index. -
Constructor Summary
ConstructorsModifierConstructorDescriptionprotected
NodePointer
(NodePointer parent) Constructs a new NodePointer.protected
NodePointer
(NodePointer parent, Locale locale) Constructs a new NodePointer. -
Method Summary
Modifier and TypeMethodDescriptionasPath()
Returns an XPath that maps to this Pointer.attributeIterator
(QName qname) Returns a NodeIterator that iterates over all attributes of the current node matching the supplied node name (could have a wildcard).childIterator
(NodeTest test, boolean reverse, NodePointer startWith) Returns a NodeIterator that iterates over all children or all children that match the given NodeTest, starting with the specified one.clone()
Clone this NodePointer.abstract int
compareChildNodePointers
(NodePointer pointer1, NodePointer pointer2) Compares two child NodePointers and returns a positive number, zero or a positive number according to the order of the pointers.int
createAttribute
(JXPathContext context, QName qName) Called to create a non-existing attributecreateChild
(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.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.createPath
(JXPathContext context) Called by a child pointer when it needs to create a parent object.createPath
(JXPathContext context, Object value) Called directly by JXPathContext.protected String
Return a string escaping single and double quotes.protected AbstractFactory
getAbstractFactory
(JXPathContext context) Gets the AbstractFactory associated with the specified JXPathContext.abstract Object
Gets the value represented by the pointer before indexing.protected String
Gets the default ns uriabstract Object
Returns the object the pointer points to; does not convert it to a "canonical" type.Gets the immediate parent pointer.Gets this instance by default, subclasses can return a pointer for the immediately contained value.int
getIndex()
If the pointer represents a collection, the index identifies an element of that collection.abstract int
If the pointer represents a collection (or collection element), returns the length of the collection.If the Pointer has a parent, returns the parent's locale; otherwise returns the locale specified when this Pointer was created.abstract QName
getName()
Gets the name of this node.Gets the NamespaceResolver associated with this NodePointer.Returns the namespace URI associated with this Pointer.getNamespaceURI
(String prefix) Decodes a namespace prefix to the corresponding URI.getNode()
Returns the object the pointer points to; does not convert it to a "canonical" type.getNodeSetByKey
(JXPathContext context, String key, Object value) Find a NodeSet by key/value.Deprecated.1.1 Please use getNode()Gets the parent pointer.getPointerByID
(JXPathContext context, String id) Locates a node by ID.getPointerByKey
(JXPathContext context, String key, String value) Locates a node by key and value.Gets the root node.getValue()
By default, returnsgetNode()
, can be overridden to return a "canonical" value, like for instance a DOM element should return its string value.If this pointer manages a transparent container, like a variable, this method returns the pointer to the contents.void
Handle a Throwable using an installed ExceptionHandler, if available.void
handle
(Throwable t, NodePointer originator) Handle a Throwable using an installed ExceptionHandler, if available.boolean
isActual()
An actual pointer points to an existing part of an object graph, even if it is null.boolean
Returns true if the pointer represents the "attribute::" axis.abstract boolean
Returnstrue
if the value of the pointer is an array or a Collection.boolean
If true, this node is auxiliary and can only be used as an intermediate in the chain of pointers.protected boolean
isDefaultNamespace
(String prefix) Returns true if the supplied prefix represents the default namespace in the context of the current node.boolean
isLanguage
(String lang) Check whether our locale matches the specified language.abstract boolean
isLeaf()
If true, this node does not have childrenboolean
isNode()
Deprecated.Please use !boolean
isRoot()
Returns true if this Pointer has no parent.Returns a NodeIterator that iterates over all namespaces of the value currently pointed at.namespacePointer
(String namespace) Returns a NodePointer for the specified namespace.static NodePointer
newChildNodePointer
(NodePointer parent, QName qName, Object bean) Allocates an new child NodePointer by iterating through all installed NodePointerFactories until it finds one that can create a pointer.static NodePointer
newNodePointer
(QName qName, Object bean, Locale locale) Allocates an entirely new NodePointer by iterating through all installed NodePointerFactories until it finds one that can create a pointer.void
Print internal structure of a pointer for debuggingvoid
remove()
Remove the node of the object graph this pointer points to.void
setAttribute
(boolean attribute) Sets to true if the pointer represents the "attribute::" axis.void
setExceptionHandler
(ExceptionHandler exceptionHandler) Sets the exceptionHandler of this NodePointer.void
setIndex
(int index) Sets the index of this NodePointer.void
setNamespaceResolver
(NamespaceResolver namespaceResolver) Sets the NamespaceResolver for this NodePointer.abstract void
Converts the value to the required type and changes the corresponding object to that value.boolean
Checks if this Pointer matches the supplied NodeTest.toString()
static NodePointer
verify
(NodePointer nodePointer) Verify the structure of a given NodePointer.
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Field Details
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WHOLE_COLLECTION
Whole collection index.- See Also:
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UNKNOWN_NAMESPACE
Constant to indicate unknown namespace- See Also:
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index
Index for this NodePointer. -
parent
Parent pointer -
locale
Locale
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Constructor Details
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NodePointer
Constructs a new NodePointer.- Parameters:
parent
- Pointer
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NodePointer
Constructs a new NodePointer.- Parameters:
parent
- Pointerlocale
- Locale
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Method Details
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newChildNodePointer
Allocates an new child NodePointer by iterating through all installed NodePointerFactories until it finds one that can create a pointer.- Parameters:
parent
- pointerqName
- QNamebean
- Object- Returns:
- NodePointer
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newNodePointer
Allocates an entirely new NodePointer by iterating through all installed NodePointerFactories until it finds one that can create a pointer.- Parameters:
qName
- QNamebean
- Objectlocale
- Locale- Returns:
- NodePointer
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verify
Verify the structure of a given NodePointer.- Parameters:
nodePointer
- to check- Returns:
- nodePointer
- Throws:
JXPathNotFoundException
- Thrown when there is no value at the NodePointer.
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asPath
Returns an XPath that maps to this Pointer. -
attributeIterator
Returns a NodeIterator that iterates over all attributes of the current node matching the supplied node name (could have a wildcard). May return null if the object does not support the attributes.- Parameters:
qname
- the attribute name to test- Returns:
- NodeIterator
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childIterator
Returns a NodeIterator that iterates over all children or all children that match the given NodeTest, starting with the specified one.- Parameters:
test
- NodeTest to filter childrenreverse
- specified iteration directionstartWith
- the NodePointer to start with- Returns:
- NodeIterator
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clone
Clone this NodePointer. -
compareChildNodePointers
Compares two child NodePointers and returns a positive number, zero or a positive number according to the order of the pointers.- Parameters:
pointer1
- first pointer to be comparedpointer2
- second pointer to be compared- Returns:
- int per Java comparison conventions
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compareTo
- Specified by:
compareTo
in interfaceComparable
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createAttribute
Called to create a non-existing attribute- Parameters:
context
- the owning JXPathCOntextqName
- the QName at which an attribute should be created- Returns:
- created NodePointer
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createChild
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.- Parameters:
context
- the owning JXPathCOntextqName
- the QName at which a child should be createdindex
- child index.- Returns:
- created NodePointer
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createChild
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.- Parameters:
context
- the owning JXPathCOntextqName
- the QName at which a child should be createdindex
- child index.value
- node value to set- Returns:
- created NodePointer
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createPath
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.- Parameters:
context
- the owning JXPathContext- Returns:
- created NodePointer
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createPath
Called directly by JXPathContext. Must create path and set value.- Parameters:
context
- the owning JXPathContextvalue
- the new value to set- Returns:
- created NodePointer
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escape
Return a string escaping single and double quotes.- Parameters:
string
- string to treat- Returns:
- string with any necessary changes made.
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getAbstractFactory
Gets the AbstractFactory associated with the specified JXPathContext.- Parameters:
context
- JXPathContext- Returns:
- AbstractFactory
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getBaseValue
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.- Returns:
- Object value
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getDefaultNamespaceURI
Gets the default ns uri- Returns:
- String uri
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getImmediateNode
Returns the object the pointer points to; does not convert it to a "canonical" type.- Returns:
- Object node
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getImmediateParentPointer
Gets the immediate parent pointer.- Returns:
- NodePointer
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getImmediateValuePointer
Gets this instance by default, subclasses can return a pointer for the immediately contained value.- Returns:
- NodePointer is either
this
or a pointer for the immediately contained value. - See Also:
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getIndex
If the pointer represents a collection, the index identifies an element of that collection. The default value ofindex
isWHOLE_COLLECTION
, which just means that the pointer is not indexed at all. Note: the index on NodePointer starts with 0, not 1.- Returns:
- the index.
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getLength
If the pointer represents a collection (or collection element), returns the length of the collection. Otherwise returns 1 (even if the value is null).- Returns:
- the length.
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getLocale
If the Pointer has a parent, returns the parent's locale; otherwise returns the locale specified when this Pointer was created.- Returns:
- Locale for this NodePointer
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getName
Gets the name of this node. Can be null.- Returns:
- QName The name of this node. Can be null.
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getNamespaceResolver
Gets the NamespaceResolver associated with this NodePointer.- Returns:
- NamespaceResolver
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getNamespaceURI
Returns the namespace URI associated with this Pointer.- Returns:
- String uri
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getNamespaceURI
Decodes a namespace prefix to the corresponding URI.- Parameters:
prefix
- prefix to decode- Returns:
- String uri
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getNode
Returns the object the pointer points to; does not convert it to a "canonical" type. Opens containers, properties etc and returns the ultimate contents. -
getNodeSetByKey
Find a NodeSet by key/value.- Parameters:
context
- owning JXPathContextkey
- key to search forvalue
- value to match- Returns:
- NodeSet found
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getNodeValue
Deprecated.1.1 Please use getNode()Returns the object the pointer points to; does not convert it to a "canonical" type.- Returns:
- Object node value
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getParent
Gets the parent pointer.- Returns:
- NodePointer
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getPointerByID
Locates a node by ID.- Parameters:
context
- JXPathContext owning contextid
- String id- Returns:
- Pointer found
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getPointerByKey
Locates a node by key and value.- Parameters:
context
- owning JXPathContextkey
- key to search forvalue
- value to match- Returns:
- Pointer found
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getRootNode
Gets the root node.- Specified by:
getRootNode
in interfacePointer
- Returns:
- Object value of this pointer's root (top parent).
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getValue
By default, returnsgetNode()
, can be overridden to return a "canonical" value, like for instance a DOM element should return its string value. -
getValuePointer
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 overridegetValuePointer()
directly. Override thegetImmediateValuePointer()
method instead. ThegetValuePointer()
method is callsgetImmediateValuePointer()
and, if the result is notthis
, invokesgetValuePointer()
recursively. The idea here is to open all nested containers. Let's say we have a container within a container within a container. ThegetValuePointer()
method should then open all those containers and return the pointer to the ultimate contents. It does so with the above recursion.- Returns:
- NodePointer
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handle
Handle a Throwable using an installed ExceptionHandler, if available. Public to facilitate calling for RI support; not truly intended for public consumption.- Parameters:
t
- to handle
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handle
Handle a Throwable using an installed ExceptionHandler, if available. Public to facilitate calling for RI support; not truly intended for public consumption.- Parameters:
t
- to handleoriginator
- context
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isActual
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.- Returns:
- boolean
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isAttribute
Returns true if the pointer represents the "attribute::" axis.- Returns:
- boolean
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isCollection
Returnstrue
if the value of the pointer is an array or a Collection.- Returns:
- boolean
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isContainer
If true, this node is auxiliary and can only be used as an intermediate in the chain of pointers.- Returns:
- boolean
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isDefaultNamespace
Returns true if the supplied prefix represents the default namespace in the context of the current node.- Parameters:
prefix
- the prefix to check- Returns:
true
if prefix is default
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isLanguage
Check whether our locale matches the specified language.- Parameters:
lang
- String language to check- Returns:
- true if the selected locale name starts with the specified prefix lang, case-insensitive.
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isLeaf
If true, this node does not have children- Returns:
- boolean
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isNode
Deprecated.Please use !isContainer()Tests whether this pointer is considered to be a node.- Returns:
- boolean
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isRoot
Returns true if this Pointer has no parent.- Returns:
- boolean
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namespaceIterator
Returns a NodeIterator that iterates over all namespaces of the value currently pointed at. May return null if the object does not support the namespaces.- Returns:
- NodeIterator
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namespacePointer
Returns a NodePointer for the specified namespace. Will return null if namespaces are not supported. Will return UNKNOWN_NAMESPACE if there is no such namespace.- Parameters:
namespace
- incoming namespace- Returns:
- NodePointer for
namespace
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printPointerChain
Print internal structure of a pointer for debugging -
remove
Remove the node of the object graph this pointer points to. -
setAttribute
Sets to true if the pointer represents the "attribute::" axis.- Parameters:
attribute
- boolean
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setExceptionHandler
Sets the exceptionHandler of this NodePointer.- Parameters:
exceptionHandler
- the ExceptionHandler to set
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setIndex
Sets the index of this NodePointer.- Parameters:
index
- int
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setNamespaceResolver
Sets the NamespaceResolver for this NodePointer.- Parameters:
namespaceResolver
- NamespaceResolver
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setValue
Converts the value to the required type and changes the corresponding object to that value. -
testNode
Checks if this Pointer matches the supplied NodeTest.- Parameters:
test
- the NodeTest to execute- Returns:
- true if a match
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toString
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