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oracle.stellent.ridc.common.xml
Class XPathEvaluator

java.lang.Object
oracle.stellent.ridc.common.xml.XPathEvaluator

public class XPathEvaluator

extends Object

Parses an XML file from a given inputstream. Wraps calls into the XPath API.

Field Summary

protected Node	m_contextNode
protected String	m_defaultPrefix
protected Element	m_documentRoot
protected NamespaceContext	m_namespaceContext
protected XPath	m_xpath

Constructor Summary

XPathEvaluator(Element rootElement)
Initialize an Evaluator object based on the current element as the root

XPathEvaluator(Element rootElement, NamespaceContext namespaceContext)
Initialize an Evaluator object based on the current element as the root

XPathEvaluator(InputSource xmlSource, NamespaceContext namespaceContext, boolean validating, String defaultPrefix)
Builds a new XPath evaluator from an InputSource.

XPathEvaluator(InputStream xmlStream)
Builds an XPathEvaluator with no namespace evaluator and non-validating, using "wcm" as the default namespace prefix.

XPathEvaluator(InputStream xmlStream, NamespaceContext namespaceContext, boolean validating, String defaultPrefix)
Builds a new XPath evaluator from InputStream.

XPathEvaluator(Reader xmlReader)

XPathEvaluator(Reader xmlReader, NamespaceContext namespaceContext, boolean validating, String defaultPrefix)
Builds a new XPath evaluator from a Reader.

Method Summary

protected XPathExpression	compileXPathExpression(String xpath)
Node	evaluateToNode(String xpath) Evaluate the xpath expression; return the result as a Node
NodeList	evaluateToNodeList(String xpath) Evaluate the xpath expression; return the result as a NodeList
String	evaluateToString(String xpath) Evaluate the xpath expression; return the result as a String.
protected Object	evaluateXPath(String xpath, QName returnType)
Node	getContextNode()
Node	getElementById(String id) Retrieve an element by ID.
NamespaceContext	getNamespaceContext()
Element	getRootNode()
protected XPath	getXPath()
protected void	initNamespaceContext(NamespaceContext namespaceContext) Initialize the namespace context.
void	resetContext() Reset the context to the root node
void	setContextNode(Node node) Set the context of the queries
void	setContextNode(String xpath) Set the context of the queries to be the result of the given xpath expression
void	setIdAttribute(String attribute, boolean enable) Set the ID attribute feature against this DOM tree

Methods inherited from class java.lang.Object

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

Field Detail

m_namespaceContext

protected NamespaceContext m_namespaceContext

m_documentRoot

protected Element m_documentRoot

m_xpath

protected XPath m_xpath

m_contextNode

protected Node m_contextNode

m_defaultPrefix

protected String m_defaultPrefix

Constructor Detail

XPathEvaluator

public XPathEvaluator(Element rootElement)

Initialize an Evaluator object based on the current element as the root

Parameters:

rootElement - the root of all xpath queries

XPathEvaluator

public XPathEvaluator(Element rootElement,
                      NamespaceContext namespaceContext)

Initialize an Evaluator object based on the current element as the root

Parameters:

rootElement - the root of all xpath queries

namespaceContext - the namespace context to use

XPathEvaluator

public XPathEvaluator(InputStream xmlStream)
               throws XPathEvaluatorException

Builds an XPathEvaluator with no namespace evaluator and non-validating, using "wcm" as the default namespace prefix.

Parameters:

xmlStream - the stream to the xml file contents

Throws:

XPathEvaluatorException

XPathEvaluator

public XPathEvaluator(InputStream xmlStream,
                      NamespaceContext namespaceContext,
                      boolean validating,
                      String defaultPrefix)
               throws XPathEvaluatorException

Builds a new XPath evaluator from InputStream.

Parameters:

xmlStream - the stream to the xml file contents

namespaceContext - (optional) the namespace resolver

validating - true to set the parser to validating

defaultPrefix - the prefix to use for querying in the default namespace

Throws:

XPathEvaluatorException

XPathEvaluator

public XPathEvaluator(Reader xmlReader)
               throws XPathEvaluatorException

Throws:

XPathEvaluatorException

XPathEvaluator

public XPathEvaluator(Reader xmlReader,
                      NamespaceContext namespaceContext,
                      boolean validating,
                      String defaultPrefix)
               throws XPathEvaluatorException

Builds a new XPath evaluator from a Reader.

Parameters:

xmlReader - the reader to the xml file contents

namespaceContext - (optional) the namespace resolver

validating - true to set the parser to validating

defaultPrefix - the prefix to use for querying in the default namespace

Throws:

XPathEvaluatorException

XPathEvaluator

public XPathEvaluator(InputSource xmlSource,
                      NamespaceContext namespaceContext,
                      boolean validating,
                      String defaultPrefix)
               throws XPathEvaluatorException

Builds a new XPath evaluator from an InputSource.

Parameters:

xmlSource - the inputSource to the xml file contents

namespaceContext - (optional) the namespace resolver

validating - true to set the parser to validating

defaultPrefix - the prefix to use for querying in the default namespace

Throws:

XPathEvaluatorException

Method Detail

initNamespaceContext

protected void initNamespaceContext(NamespaceContext namespaceContext)

Initialize the namespace context. Should be called by all constructors.

Parameters:

namespaceContext - the namespace context or null to use the default

getNamespaceContext

public NamespaceContext getNamespaceContext()

Returns:

the configured namespace context

setIdAttribute

public void setIdAttribute(String attribute,
                           boolean enable)

Set the ID attribute feature against this DOM tree

Parameters:

attribute - the attribute to declare as the DOM ID attribute

enable - true to enable this attribute, false to disable the ID functionality

getElementById

public Node getElementById(String id)

Retrieve an element by ID. Only valid after calling setIdAttribute(String, boolean) to enable the ID attribute functionality.

Parameters:

id - the ID to query

Returns:

the node with the corresponding ID or null if not found

setContextNode

public void setContextNode(Node node)

Set the context of the queries

Parameters:

node - the context node

setContextNode

public void setContextNode(String xpath)

Set the context of the queries to be the result of the given xpath expression

Parameters:

xpath - the xpath to the root for the queries

getContextNode

public Node getContextNode()

Returns:

the current context node

getRootNode

public Element getRootNode()

Returns:

get root node

resetContext

public void resetContext()

Reset the context to the root node

evaluateToString

public String evaluateToString(String xpath)

Evaluate the xpath expression; return the result as a String. This typically will be the text value of the node (i.e. attribute value, non-xml child content).

Parameters:

xpath - the xpath expression from the current context root

Returns:

a string expression of the result

evaluateToNode

public Node evaluateToNode(String xpath)

Evaluate the xpath expression; return the result as a Node

Parameters:

xpath - the xpath expression from the current context root

Returns:

a string expression of the result

evaluateToNodeList

public NodeList evaluateToNodeList(String xpath)

Evaluate the xpath expression; return the result as a NodeList

Parameters:

xpath - the xpath expression from the current context root

Returns:

a string expression of the result

evaluateXPath

protected Object evaluateXPath(String xpath,
                               QName returnType)

compileXPathExpression

protected XPathExpression compileXPathExpression(String xpath)
                                          throws XPathEvaluatorException

Throws:

XPathEvaluatorException

getXPath

protected XPath getXPath()

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