Package org.custommonkey.xmlunit

Class SimpleXpathEngine

java.lang.Object

org.custommonkey.xmlunit.SimpleXpathEngine

All Implemented Interfaces:

XMLConstants, XpathEngine, XSLTConstants

public class SimpleXpathEngine
extends Object
implements XpathEngine, XSLTConstants

Simple class for accessing the Nodes matched by an Xpath expression, or evaluating the String value of an Xpath expression. Uses a copy-of or value-of XSL template (as appropriate) to execute the Xpath. This is not an efficient method for accessing XPaths but it is portable across underlying transform implementations. (Yes I know Jaxen is too, but this approach seemed to be the simplest thing that could possibly work...)

Field Summary

Fields

Modifier and Type	Field	Description
private NamespaceContext	ctx

Fields inherited from interface org.custommonkey.xmlunit.XMLConstants

CLOSE_NODE, END_CDATA, END_COMMENT, END_PROCESSING_INSTRUCTION, NULL_NS_URI, OPEN_END_NODE, OPEN_START_NODE, START_CDATA, START_COMMENT, START_DOCTYPE, START_PROCESSING_INSTRUCTION, W3C_XML_SCHEMA_INSTANCE_NO_NAMESPACE_SCHEMA_LOCATION_ATTR, W3C_XML_SCHEMA_INSTANCE_NS_URI, W3C_XML_SCHEMA_INSTANCE_SCHEMA_LOCATION_ATTR, W3C_XML_SCHEMA_NS_URI, XML_DECLARATION, XMLNS_PREFIX, XPATH_ATTRIBUTE_IDENTIFIER, XPATH_CHARACTER_NODE_IDENTIFIER, XPATH_COMMENT_IDENTIFIER, XPATH_NODE_INDEX_END, XPATH_NODE_INDEX_START, XPATH_PROCESSING_INSTRUCTION_IDENTIFIER, XPATH_SEPARATOR

Fields inherited from interface org.custommonkey.xmlunit.XSLTConstants

JAVA5_XSLTC_FACTORY_NAME, XSLT_END, XSLT_IDENTITY_TEMPLATE, XSLT_START, XSLT_START_NO_VERSION, XSLT_STRIP_COMMENTS_TEMPLATE, XSLT_STRIP_WHITESPACE, XSLT_XML_OUTPUT_NOINDENT

Constructor Summary

Constructors

Constructor	Description
SimpleXpathEngine()

Method Summary

Modifier and Type	Method	Description
String	evaluate(String select, Document document)	Evaluate the result of executing the specified xpath syntax select expression on the specified document
private String	getCopyTransformation(String select)
NodeList	getMatchingNodes(String select, Document document)	Execute the specified xpath syntax select expression on the specified document and return the list of nodes (could have length zero) that match
private String	getNamespaceDeclarations()	returns namespace declarations for all namespaces known to the current context.
private String	getValueTransformation(String select)
protected Document	getXPathResultAsDocument(String select, Document document)	Execute the copy-of transform and return the resulting Document.
protected Node	getXPathResultNode(String select, Document document)	Testable method to execute the copy-of transform and return the root node of the resulting Document.
private StringBuilder	getXSLTBase()	What every XSL transform needs
private void	performTransform(String xslt, Document document, Result result)	Perform the actual transformation work required
void	setNamespaceContext(NamespaceContext ctx)	Establish a namespace context.

Methods inherited from class java.lang.Object

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

Field Details

ctx

private NamespaceContext ctx

Constructor Details

SimpleXpathEngine

public SimpleXpathEngine()

Method Details

getXSLTBase

private StringBuilder getXSLTBase()

What every XSL transform needs

getCopyTransformation

private String getCopyTransformation(String select)

Parameters:

select - an xpath syntax select expression

Returns:

the copy-of transformation

getValueTransformation

private String getValueTransformation(String select)

Parameters:

select - an xpath syntax select expression

Returns:

the value-of transformation

performTransform

private void performTransform(String xslt,
 Document document,
 Result result)
                       throws TransformerException,
ConfigurationException,
XpathException

Perform the actual transformation work required

Parameters:

xslt -

document -

result -

Throws:

XpathException

TransformerException

ConfigurationException

getXPathResultNode

protected Node getXPathResultNode(String select,
 Document document)
                           throws ConfigurationException,
TransformerException,
XpathException

Testable method to execute the copy-of transform and return the root node of the resulting Document.

Parameters:

select -

document -

Returns:

the root node of the Document created by the copy-of transform.

Throws:

ConfigurationException

TransformerException

XpathException

getXPathResultAsDocument

protected Document getXPathResultAsDocument(String select,
 Document document)
                                     throws ConfigurationException,
TransformerException,
XpathException

Execute the copy-of transform and return the resulting Document. Used for XMLTestCase comparison

Parameters:

select -

document -

Returns:

the Document created by the copy-of transform.

Throws:

ConfigurationException

TransformerException

XpathException

getMatchingNodes

public NodeList getMatchingNodes(String select,
 Document document)
                          throws ConfigurationException,
XpathException

Execute the specified xpath syntax select expression on the specified document and return the list of nodes (could have length zero) that match

Specified by:

getMatchingNodes in interface XpathEngine

Parameters:

select -

document -

Returns:

list of matching nodes

Throws:

ConfigurationException

XpathException

evaluate

public String evaluate(String select,
 Document document)
                throws ConfigurationException,
XpathException

Evaluate the result of executing the specified xpath syntax select expression on the specified document

Specified by:

evaluate in interface XpathEngine

Parameters:

select -

document -

Returns:

evaluated result

Throws:

ConfigurationException

XpathException

setNamespaceContext

public void setNamespaceContext(NamespaceContext ctx)

Description copied from interface: XpathEngine

Establish a namespace context.

Specified by:

setNamespaceContext in interface XpathEngine

getNamespaceDeclarations

private String getNamespaceDeclarations()

returns namespace declarations for all namespaces known to the current context.