org.jaxen.jdom

Class DocumentNavigator

java.lang.Object

org.jaxen.DefaultNavigator

org.jaxen.jdom.DocumentNavigator

All Implemented Interfaces:

Serializable, NamedAccessNavigator, Navigator

public class DocumentNavigator
extends DefaultNavigator
implements NamedAccessNavigator

Interface for navigating around the JDOM object model.

This class is not intended for direct usage, but is used by the Jaxen engine during evaluation.

Author:

bob mcwhirter, Stephen Colebourne

See Also:

XPath, Serialized Form

Constructor Summary

Constructors

Constructor and Description
DocumentNavigator()

Method Summary

Methods

Modifier and Type	Method and Description
Iterator	getAttributeAxisIterator(Object contextNode) Throws UnsupportedAxisException.
Iterator	getAttributeAxisIterator(Object contextNode, String localName, String namespacePrefix, String namespaceURI) Retrieves an Iterator over the attribute elements that match the supplied name.
String	getAttributeName(Object obj) Retrieve the local name of the given attribute node.
String	getAttributeNamespaceUri(Object obj) Retrieve the namespace URI of the given attribute node.
String	getAttributeQName(Object obj) Retrieve the qualified name of the given attribute node.
String	getAttributeStringValue(Object obj) Retrieve the string-value of an attribute node.
Iterator	getChildAxisIterator(Object contextNode) Throws UnsupportedAxisException
Iterator	getChildAxisIterator(Object contextNode, String localName, String namespacePrefix, String namespaceURI) Retrieves an Iterator over the child elements that match the supplied local name and namespace URI.
String	getCommentStringValue(Object obj) Retrieve the string-value of a comment node.
Object	getDocument(String url) Default implementation that always returns null.
Object	getDocumentNode(Object contextNode) Returns the document node that contains the given context node.
String	getElementName(Object obj) Retrieve the local name of the given element node.
String	getElementNamespaceUri(Object obj) Retrieve the namespace URI of the given element node.
String	getElementQName(Object obj) Retrieve the qualified name of the given element node.
String	getElementStringValue(Object obj) Retrieve the string-value of an element node.
static Navigator	getInstance()
Iterator	getNamespaceAxisIterator(Object contextNode) Throws UnsupportedAxisException.
String	getNamespacePrefix(Object obj) Retrieve the namespace prefix of a namespace node.
String	getNamespaceStringValue(Object obj) Retrieve the string-value of a namespace node.
Iterator	getParentAxisIterator(Object contextNode) Throws UnsupportedAxisException
String	getProcessingInstructionData(Object obj) Retrieve the data of a processing-instruction.
String	getProcessingInstructionTarget(Object obj) Retrieve the target of a processing-instruction.
String	getTextStringValue(Object obj) Retrieve the string-value of a text node.
boolean	isAttribute(Object obj) Returns whether the given object is an attribute node.
boolean	isComment(Object obj) Returns whether the given object is a comment node.
boolean	isDocument(Object obj) Returns whether the given object is a document node.
boolean	isElement(Object obj) Returns whether the given object is an element node.
boolean	isNamespace(Object obj) Returns whether the given object is a namespace node.
boolean	isProcessingInstruction(Object obj) Returns whether the given object is a processing-instruction node.
boolean	isText(Object obj) Returns whether the given object is a text node.
XPath	parseXPath(String xpath) Returns a parsed form of the given XPath string, which will be suitable for queries on JDOM documents.
String	translateNamespacePrefixToUri(String prefix, Object context) Translate a namespace prefix to a namespace URI, possibly considering a particular element node.

Methods inherited from class org.jaxen.DefaultNavigator

getAncestorAxisIterator, getAncestorOrSelfAxisIterator, getDescendantAxisIterator, getDescendantOrSelfAxisIterator, getElementById, getFollowingAxisIterator, getFollowingSiblingAxisIterator, getNodeType, getParentNode, getPrecedingAxisIterator, getPrecedingSiblingAxisIterator, getSelfAxisIterator

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jaxen.Navigator

getAncestorAxisIterator, getAncestorOrSelfAxisIterator, getDescendantAxisIterator, getDescendantOrSelfAxisIterator, getElementById, getFollowingAxisIterator, getFollowingSiblingAxisIterator, getNodeType, getParentNode, getPrecedingAxisIterator, getPrecedingSiblingAxisIterator, getSelfAxisIterator

Constructor Detail

DocumentNavigator

public DocumentNavigator()

Method Detail

getInstance

public static Navigator getInstance()

isElement

public boolean isElement(Object obj)

Description copied from interface: Navigator

Returns whether the given object is an element node.

Specified by:

isElement in interface Navigator

Parameters:

obj - the object to test

Returns:

true if the object is an element node, else false

isComment

public boolean isComment(Object obj)

Description copied from interface: Navigator

Returns whether the given object is a comment node.

Specified by:

isComment in interface Navigator

Parameters:

obj - the object to test

Returns:

true if the object is a comment node, else false

isText

public boolean isText(Object obj)

Description copied from interface: Navigator

Returns whether the given object is a text node.

Specified by:

isText in interface Navigator

Parameters:

obj - the object to test

Returns:

true if the object is a text node, else false

isAttribute

public boolean isAttribute(Object obj)

Description copied from interface: Navigator

Returns whether the given object is an attribute node.

Specified by:

isAttribute in interface Navigator

Parameters:

obj - the object to test

Returns:

true if the object is an attribute node, else false

isProcessingInstruction

public boolean isProcessingInstruction(Object obj)

Description copied from interface: Navigator

Returns whether the given object is a processing-instruction node.

Specified by:

isProcessingInstruction in interface Navigator

Parameters:

obj - the object to test

Returns:

true if the object is a processing-instruction node, else false

isDocument

public boolean isDocument(Object obj)

Description copied from interface: Navigator

Returns whether the given object is a document node. A document node is the node that is selected by the XPath expression /.

Specified by:

isDocument in interface Navigator

Parameters:

obj - the object to test

Returns:

true if the object is a document node, else false

isNamespace

public boolean isNamespace(Object obj)

Description copied from interface: Navigator

Returns whether the given object is a namespace node.

Specified by:

isNamespace in interface Navigator

Parameters:

obj - the object to test

Returns:

true if the object is a namespace node, else false

getElementName

public String getElementName(Object obj)

Description copied from interface: Navigator

Retrieve the local name of the given element node.

Specified by:

getElementName in interface Navigator

Parameters:

obj - the context element node

Returns:

the local name of the element node

getElementNamespaceUri

public String getElementNamespaceUri(Object obj)

Description copied from interface: Navigator

Retrieve the namespace URI of the given element node.

Specified by:

getElementNamespaceUri in interface Navigator

Parameters:

obj - the context element node

Returns:

the namespace URI of the element node

getAttributeName

public String getAttributeName(Object obj)

Description copied from interface: Navigator

Retrieve the local name of the given attribute node.

Specified by:

getAttributeName in interface Navigator

Parameters:

obj - the context attribute node

Returns:

the local name of the attribute node

getAttributeNamespaceUri

public String getAttributeNamespaceUri(Object obj)

Description copied from interface: Navigator

Retrieve the namespace URI of the given attribute node.

Specified by:

getAttributeNamespaceUri in interface Navigator

Parameters:

obj - the context attribute node

Returns:

the namespace URI of the attribute node

getChildAxisIterator

public Iterator getChildAxisIterator(Object contextNode)

Description copied from class: DefaultNavigator

Throws UnsupportedAxisException

Specified by:

getChildAxisIterator in interface Navigator

Overrides:

getChildAxisIterator in class DefaultNavigator

Parameters:

contextNode - the original context node

Returns:

never returns

getChildAxisIterator

public Iterator getChildAxisIterator(Object contextNode,
                            String localName,
                            String namespacePrefix,
                            String namespaceURI)

Retrieves an Iterator over the child elements that match the supplied local name and namespace URI.

Specified by:

getChildAxisIterator in interface NamedAccessNavigator

Parameters:

contextNode - the origin context node

localName - the local name of the children to return, always present

namespacePrefix - ignored; prefixes are not used when matching in XPath

namespaceURI - the URI of the namespace of the children to return

Returns:

an Iterator that traverses the named children, or null if none

getNamespaceAxisIterator

public Iterator getNamespaceAxisIterator(Object contextNode)

Description copied from class: DefaultNavigator

Throws UnsupportedAxisException. Subclasses that support the namespace axis must override this method.

Specified by:

getNamespaceAxisIterator in interface Navigator

Overrides:

getNamespaceAxisIterator in class DefaultNavigator

Parameters:

contextNode - the original context node

Returns:

never returns

getParentAxisIterator

public Iterator getParentAxisIterator(Object contextNode)

Description copied from class: DefaultNavigator

Throws UnsupportedAxisException

Specified by:

getParentAxisIterator in interface Navigator

Overrides:

getParentAxisIterator in class DefaultNavigator

Parameters:

contextNode - the original context node

Returns:

never returns

getAttributeAxisIterator

public Iterator getAttributeAxisIterator(Object contextNode)

Description copied from class: DefaultNavigator

Throws UnsupportedAxisException. Subclasses that support the attribute axis must override this method.

Specified by:

getAttributeAxisIterator in interface Navigator

Overrides:

getAttributeAxisIterator in class DefaultNavigator

Parameters:

contextNode - the original context node

Returns:

never returns

getAttributeAxisIterator

public Iterator getAttributeAxisIterator(Object contextNode,
                                String localName,
                                String namespacePrefix,
                                String namespaceURI)

Retrieves an Iterator over the attribute elements that match the supplied name.

Specified by:

getAttributeAxisIterator in interface NamedAccessNavigator

Parameters:

contextNode - the origin context node

localName - the local name of the attributes to return, always present

namespacePrefix - the prefix of the namespace of the attributes to return

namespaceURI - the URI of the namespace of the attributes to return

Returns:

an Iterator that traverses the named attributes, not null

parseXPath

public XPath parseXPath(String xpath)
                 throws SAXPathException

Returns a parsed form of the given XPath string, which will be suitable for queries on JDOM documents.

Specified by:

parseXPath in interface Navigator

Parameters:

xpath - the XPath expression

Returns:

a new XPath expression object

Throws:

SAXPathException - if the string is not a syntactically correct XPath expression

See Also:

XPath

getDocumentNode

public Object getDocumentNode(Object contextNode)

Description copied from interface: Navigator

Returns the document node that contains the given context node.

Specified by:

getDocumentNode in interface Navigator

Overrides:

getDocumentNode in class DefaultNavigator

Parameters:

contextNode - the context node

Returns:

the document of the context node

See Also:

Navigator.isDocument(Object)

getElementQName

public String getElementQName(Object obj)

Description copied from interface: Navigator

Retrieve the qualified name of the given element node.

Specified by:

getElementQName in interface Navigator

Parameters:

obj - the context element node

Returns:

the qualified name of the element node

getAttributeQName

public String getAttributeQName(Object obj)

Description copied from interface: Navigator

Retrieve the qualified name of the given attribute node.

Specified by:

getAttributeQName in interface Navigator

Parameters:

obj - the context attribute node

Returns:

the qualified name of the attribute node

getNamespaceStringValue

public String getNamespaceStringValue(Object obj)

Description copied from interface: Navigator

Retrieve the string-value of a namespace node. This is generally the namespace URI. This may be the empty string but must not be null.

Specified by:

getNamespaceStringValue in interface Navigator

Parameters:

obj - the namespace node

Returns:

the string-value of the node

getNamespacePrefix

public String getNamespacePrefix(Object obj)

Description copied from interface: Navigator

Retrieve the namespace prefix of a namespace node.

Specified by:

getNamespacePrefix in interface Navigator

Parameters:

obj - the namespace node

Returns:

the prefix associated with the node

getTextStringValue

public String getTextStringValue(Object obj)

Description copied from interface: Navigator

Retrieve the string-value of a text node. This must not be null and should not be the empty string. The XPath data model does not allow empty text nodes.

Specified by:

getTextStringValue in interface Navigator

Parameters:

obj - the text node

Returns:

the string-value of the node

getAttributeStringValue

public String getAttributeStringValue(Object obj)

Description copied from interface: Navigator

Retrieve the string-value of an attribute node. This should be the XML 1.0 normalized attribute value. This may be the empty string but must not be null.

Specified by:

getAttributeStringValue in interface Navigator

Parameters:

obj - the attribute node

Returns:

the string-value of the node

getElementStringValue

public String getElementStringValue(Object obj)

Description copied from interface: Navigator

Retrieve the string-value of an element node. This may be the empty string if the element is empty, but must not be null.

Specified by:

getElementStringValue in interface Navigator

Parameters:

obj - the comment node.

Returns:

the string-value of the node.

getProcessingInstructionTarget

public String getProcessingInstructionTarget(Object obj)

Description copied from interface: Navigator

Retrieve the target of a processing-instruction.

Specified by:

getProcessingInstructionTarget in interface Navigator

Overrides:

getProcessingInstructionTarget in class DefaultNavigator

Parameters:

obj - the context processing-instruction node

Returns:

the target of the processing-instruction node

getProcessingInstructionData

public String getProcessingInstructionData(Object obj)

Description copied from interface: Navigator

Retrieve the data of a processing-instruction.

Specified by:

getProcessingInstructionData in interface Navigator

Overrides:

getProcessingInstructionData in class DefaultNavigator

Parameters:

obj - the context processing-instruction node

Returns:

the data of the processing-instruction node

getCommentStringValue

public String getCommentStringValue(Object obj)

Description copied from interface: Navigator

Retrieve the string-value of a comment node. This may be the empty string if the comment is empty, but must not be null.

Specified by:

getCommentStringValue in interface Navigator

Parameters:

obj - the comment node

Returns:

the string-value of the node

translateNamespacePrefixToUri

public String translateNamespacePrefixToUri(String prefix,
                                   Object context)

Description copied from interface: Navigator

Translate a namespace prefix to a namespace URI, possibly considering a particular element node.

Strictly speaking, prefix-to-URI translation should occur irrespective of any element in the document. This method is provided to allow a non-conforming ease-of-use enhancement.

Specified by:

translateNamespacePrefixToUri in interface Navigator

Overrides:

translateNamespacePrefixToUri in class DefaultNavigator

Parameters:

prefix - the prefix to translate

context - the element to consider during translation

Returns:

the namespace URI associated with the prefix

See Also:

NamespaceContext

getDocument

public Object getDocument(String url)
                   throws FunctionCallException

Description copied from class: DefaultNavigator

Default implementation that always returns null. Override in subclass if the subclass can load documents.

Specified by:

getDocument in interface Navigator

Overrides:

getDocument in class DefaultNavigator

Parameters:

url - the URL of the document to load

Returns:

null

Throws:

FunctionCallException - if an error occurs while loading the URL; e.g. an I/O error or the document is malformed