net.sourceforge.htmlunit.xpath.patterns

Class NodeTest

java.lang.Object

net.sourceforge.htmlunit.xpath.Expression

net.sourceforge.htmlunit.xpath.patterns.NodeTest

All Implemented Interfaces:

SourceLocator, ExpressionNode, XPathVisitable

Direct Known Subclasses:

PredicatedNodeTest, StepPattern

public class NodeTest
extends Expression

This is the basic node test class for both match patterns and location path steps.

Field Summary

Fields

Modifier and Type	Field and Description
protected String	m_name The local name to be tested for.
protected int	m_whatToShow This attribute determines which node types are accepted.
static XNumber	SCORE_NODETEST The match score if the pattern consists of just a NodeTest.
static XNumber	SCORE_NONE The match score if no match is made.
static XNumber	SCORE_NSWILD The match score if the pattern pattern has the form NCName:*.
static XNumber	SCORE_OTHER The match score if the pattern consists of something other than just a NodeTest or just a qname.
static XNumber	SCORE_QNAME The match score if the pattern has the form of a QName optionally preceded by an @ character.
static int	SHOW_BYFUNCTION Special bitmap for match patterns starting with a function.
static String	WILD The namespace or local name for node tests with a wildcard.

Constructor Summary

Constructors

Constructor and Description
NodeTest() Null argument constructor.
NodeTest(int whatToShow) Construct an NodeTest that doesn't test for node names.
NodeTest(int whatToShow, String namespace, String name) Construct an NodeTest that tests for namespaces and node names.

Method Summary

Modifier and Type	Method and Description
protected void	calcScore() Static calc of match score.
void	callVisitors(XPathVisitor visitor) This will traverse the hierarchy, calling the visitor for each member.
boolean	deepEquals(Expression expr) Compare this object with another object and see if they are equal, include the sub heararchy.
XObject	execute(XPathContext xctxt) Execute an expression in the XPath runtime context, and return the result of the expression.
XObject	execute(XPathContext xctxt, int context) Execute an expression in the XPath runtime context, and return the result of the expression.
XObject	execute(XPathContext xctxt, int context, DTM dtm, int expType) Execute an expression in the XPath runtime context, and return the result of the expression.
String	getLocalName() Return the local name to be tested.
String	getNamespace() Return the namespace to be tested.
static int	getNodeTypeTest(int whatToShow) Tell what node type to test, if not DTMFilter.SHOW_ALL.
XNumber	getStaticScore() Get the static score for this node test.
int	getWhatToShow() This attribute determines which node types are accepted.
void	initNodeTest(int whatToShow) Initialize this node test by setting the whatToShow property, and calculating the score that this test will return if a test succeeds.
void	initNodeTest(int whatToShow, String namespace, String name) Initialize this node test by setting the whatToShow property and the namespace and local name, and calculating the score that this test will return if a test succeeds.
void	setLocalName(String name) Set the local name to be tested.
void	setNamespace(String ns) Set the namespace to be tested.
void	setStaticScore(XNumber score) Set the static score for this node test.
void	setWhatToShow(int what) This attribute determines which node types are accepted.

Methods inherited from class net.sourceforge.htmlunit.xpath.Expression

asIterator, asNode, assertion, bool, canTraverseOutsideSubtree, error, execute, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isSameClass, isStableNumber, num

Methods inherited from class java.lang.Object

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

Field Detail

WILD

public static final String WILD

The namespace or local name for node tests with a wildcard.

See Also:

the XPath NameTest production., Constant Field Values

m_whatToShow

protected int m_whatToShow

This attribute determines which node types are accepted.

SHOW_BYFUNCTION

public static final int SHOW_BYFUNCTION

Special bitmap for match patterns starting with a function. Make sure this does not conflict with NodeFilter.

See Also:

Constant Field Values

m_name

protected String m_name

The local name to be tested for.

SCORE_NODETEST

public static final XNumber SCORE_NODETEST

The match score if the pattern consists of just a NodeTest.

See Also:

XSLT Specification - 5.5 Conflict Resolution for Template Rules

SCORE_NSWILD

public static final XNumber SCORE_NSWILD

The match score if the pattern pattern has the form NCName:*.

See Also:

XSLT Specification - 5.5 Conflict Resolution for Template Rules

SCORE_QNAME

public static final XNumber SCORE_QNAME

The match score if the pattern has the form of a QName optionally preceded by an @ character.

See Also:

XSLT Specification - 5.5 Conflict Resolution for Template Rules

SCORE_OTHER

public static final XNumber SCORE_OTHER

The match score if the pattern consists of something other than just a NodeTest or just a qname.

See Also:

XSLT Specification - 5.5 Conflict Resolution for Template Rules

SCORE_NONE

public static final XNumber SCORE_NONE

The match score if no match is made.

See Also:

XSLT Specification - 5.5 Conflict Resolution for Template Rules

Constructor Detail

NodeTest

public NodeTest(int whatToShow,
                String namespace,
                String name)

Construct an NodeTest that tests for namespaces and node names.

Parameters:

whatToShow - Bit set defined mainly by NodeFilter.

namespace - The namespace to be tested.

name - The local name to be tested.

NodeTest

public NodeTest(int whatToShow)

Construct an NodeTest that doesn't test for node names.

Parameters:

whatToShow - Bit set defined mainly by NodeFilter.

NodeTest

public NodeTest()

Null argument constructor.

Method Detail

getWhatToShow

public int getWhatToShow()

This attribute determines which node types are accepted. These constants are defined in the NodeFilter interface.

Returns:

bitset mainly defined in NodeFilter.

setWhatToShow

public void setWhatToShow(int what)

This attribute determines which node types are accepted. These constants are defined in the NodeFilter interface.

Parameters:

what - bitset mainly defined in NodeFilter.

getNamespace

public String getNamespace()

Return the namespace to be tested.

Returns:

The namespace to be tested for, or WILD, or null.

setNamespace

public void setNamespace(String ns)

Set the namespace to be tested.

Parameters:

ns - The namespace to be tested for, or WILD, or null.

getLocalName

public String getLocalName()

Return the local name to be tested.

Returns:

the local name to be tested, or WILD, or an empty string.

setLocalName

public void setLocalName(String name)

Set the local name to be tested.

Parameters:

name - the local name to be tested, or WILD, or an empty string.

deepEquals

public boolean deepEquals(Expression expr)

Compare this object with another object and see if they are equal, include the sub heararchy.

Specified by:

deepEquals in class Expression

Parameters:

expr - Another expression object.

Returns:

true if this objects class and the expr object's class are the same, and the data contained within both objects are considered equal.

initNodeTest

public void initNodeTest(int whatToShow)

Initialize this node test by setting the whatToShow property, and calculating the score that this test will return if a test succeeds.

Parameters:

whatToShow - Bit set defined mainly by NodeFilter.

initNodeTest

public void initNodeTest(int whatToShow,
                         String namespace,
                         String name)

Initialize this node test by setting the whatToShow property and the namespace and local name, and calculating the score that this test will return if a test succeeds.

Parameters:

whatToShow - Bit set defined mainly by NodeFilter.

namespace - The namespace to be tested.

name - The local name to be tested.

getStaticScore

public XNumber getStaticScore()

Get the static score for this node test.

Returns:

Should be one of the SCORE_XXX constants.

setStaticScore

public void setStaticScore(XNumber score)

Set the static score for this node test.

Parameters:

score - Should be one of the SCORE_XXX constants.

calcScore

protected void calcScore()

Static calc of match score.

getNodeTypeTest

public static int getNodeTypeTest(int whatToShow)

Tell what node type to test, if not DTMFilter.SHOW_ALL.

Parameters:

whatToShow - Bit set defined mainly by DTMFilter.

Returns:

the node type for the whatToShow. Since whatToShow can specify multiple types, it will return the first bit tested that is on, so the caller of this function should take care that this is the function they really want to call. If none of the known bits are set, this function will return zero.

execute

public XObject execute(XPathContext xctxt,
                       int context)
                throws TransformerException

Execute an expression in the XPath runtime context, and return the result of the expression.

Overrides:

execute in class Expression

Parameters:

xctxt - The XPath runtime context.

context - The currentNode.

Returns:

The result of the expression in the form of a XObject.

Throws:

TransformerException - if a runtime exception occurs.

execute

public XObject execute(XPathContext xctxt,
                       int context,
                       DTM dtm,
                       int expType)
                throws TransformerException

Execute an expression in the XPath runtime context, and return the result of the expression.

Overrides:

execute in class Expression

Parameters:

xctxt - The XPath runtime context.

context - The currentNode.

dtm - The DTM of the current node.

expType - The expanded type ID of the current node.

Returns:

The result of the expression in the form of a XObject.

Throws:

TransformerException - if a runtime exception occurs.

execute

public XObject execute(XPathContext xctxt)
                throws TransformerException

Execute an expression in the XPath runtime context, and return the result of the expression.

Specified by:

execute in class Expression

Parameters:

xctxt - The XPath runtime context.

Returns:

The result of the expression in the form of a XObject.

Throws:

TransformerException - if a runtime exception occurs.

callVisitors

public void callVisitors(XPathVisitor visitor)

This will traverse the hierarchy, calling the visitor for each member. If the called visitor method returns false, the subtree should not be called.

Parameters:

visitor - The visitor whose appropriate method will be called.