org.apache.xpath.patterns
Class NodeTest

java.lang.Object
  org.apache.xpath.Expression
      org.apache.xpath.patterns.NodeTest

All Implemented Interfaces:

ExpressionNode, Serializable, javax.xml.transform.SourceLocator, 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.

See Also:

Serialized Form

Field Summary

private boolean	m_isTotallyWild True if this test has a null namespace and a local name of WILD.
protected String	m_name The local name to be tested for.
(package private) String	m_namespace The namespace to be tested for, which may be null.
(package private) XNumber	m_score Statically calculated score for this test.
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	SUPPORTS_PRE_STRIPPING The URL to pass to the Node#supports method, to see if the DOM has already been stripped of whitespace nodes.
static String	WILD The namespace or local name for node tests with a wildcard.

Fields inherited from class org.apache.xpath.Expression

Constructor Summary

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

protected void	calcScore() Static calc of match score.
void	callVisitors(ExpressionOwner owner, XPathVisitor visitor) This will traverse the heararchy, calling the visitor for each member.
static void	debugWhatToShow(int whatToShow) Do a diagnostics dump of a whatToShow bit set.
boolean	deepEquals(Expression expr) Compare this object with another object and see if they are equal, include the sub heararchy.
XObject	execute(XPathContext xctxt) Test the current node to see if it matches the given node test.
XObject	execute(XPathContext xctxt, int context) Tell what the test score is for the given node.
XObject	execute(XPathContext xctxt, int context, DTM dtm, int expType) Tell what the test score is for the given node.
void	fixupVariables(Vector vars, int globalsSize) Node tests by themselves do not need to fix up variables.
double	getDefaultScore() Get the score that this test will return if a test succeeds.
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.
private static boolean	subPartMatch(String p, String t) Two names are equal if they and either both are null or the name t is wild and the name p is non-null, or the two strings are equal.
private static boolean	subPartMatchNS(String p, String t) This is temporary to patch over Xerces issue with representing DOM namespaces as "".

Methods inherited from class org.apache.xpath.Expression

asIterator, asIteratorRaw, asNode, assertion, bool, canTraverseOutsideSubtree, error, execute, executeCharsToContentHandler, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isNodesetExpr, isSameClass, isStableNumber, num, warn, xstr

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

SUPPORTS_PRE_STRIPPING

public static final String SUPPORTS_PRE_STRIPPING

The URL to pass to the Node#supports method, to see if the DOM has already been stripped of whitespace nodes.

See Also:

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_namespace

String m_namespace

The namespace to be tested for, which may be null.

m_name

protected String m_name

The local name to be tested for.

m_score

XNumber m_score

Statically calculated score for this test. One of SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_QNAME, or SCORE_OTHER.

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

m_isTotallyWild

private boolean m_isTotallyWild

True if this test has a null namespace and a local name of WILD.

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)

Description copied from class: Expression

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.

See Also:

Expression.deepEquals(Expression)

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.

getDefaultScore

public double getDefaultScore()

Get the score that this test will return if a test succeeds.

Returns:

the score that this test will return if a test succeeds.

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.

debugWhatToShow

public static void debugWhatToShow(int whatToShow)

Do a diagnostics dump of a whatToShow bit set.

Parameters:

whatToShow - Bit set defined mainly by DTMFilter.

subPartMatch

private static final boolean subPartMatch(String p,
                                          String t)

Two names are equal if they and either both are null or the name t is wild and the name p is non-null, or the two strings are equal.

Parameters:

p - part string from the node.

t - target string, which may be WILD.

Returns:

true if the strings match according to the rules of this method.

subPartMatchNS

private static final boolean subPartMatchNS(String p,
                                            String t)

This is temporary to patch over Xerces issue with representing DOM namespaces as "".

Parameters:

p - part string from the node, which may represent the null namespace as null or as "".

t - target string, which may be WILD.

Returns:

true if the strings match according to the rules of this method.

execute

public XObject execute(XPathContext xctxt,
                       int context)
                throws javax.xml.transform.TransformerException

Tell what the test score is for the given node.

Overrides:

execute in class Expression

Parameters:

xctxt - XPath runtime context.

context - The node being tested.

Returns:

SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_QNAME, or SCORE_OTHER.

Throws:

javax.xml.transform.TransformerException

execute

public XObject execute(XPathContext xctxt,
                       int context,
                       DTM dtm,
                       int expType)
                throws javax.xml.transform.TransformerException

Tell what the test score is for the given node.

Overrides:

execute in class Expression

Parameters:

xctxt - XPath runtime context.

context - The node being tested.

dtm - The DTM of the current node.

expType - The expanded type ID of the current node.

Returns:

SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_QNAME, or SCORE_OTHER.

Throws:

javax.xml.transform.TransformerException

execute

public XObject execute(XPathContext xctxt)
                throws javax.xml.transform.TransformerException

Test the current node to see if it matches the given node test.

Specified by:

execute in class Expression

Parameters:

xctxt - XPath runtime context.

Returns:

SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_QNAME, or SCORE_OTHER.

Throws:

javax.xml.transform.TransformerException

fixupVariables

public void fixupVariables(Vector vars,
                           int globalsSize)

Node tests by themselves do not need to fix up variables.

Specified by:

fixupVariables in class Expression

Parameters:

vars - List of QNames that correspond to variables. This list should be searched backwards for the first qualified name that corresponds to the variable reference qname. The position of the QName in the vector from the start of the vector will be its position in the stack frame (but variables above the globalsTop value will need to be offset to the current stack frame). NEEDSDOC @param globalsSize

callVisitors

public void callVisitors(ExpressionOwner owner,
                         XPathVisitor visitor)

Description copied from interface: XPathVisitable

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

Parameters:

owner - The owner of the visitor, where that path may be rewritten if needed.

visitor - The visitor whose appropriate method will be called.

See Also:

XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor)