Package eu.europa.ted.efx.xpath

Class XPathAttributeLocator

java.lang.Object

eu.europa.ted.efx.xpath.XPath20BaseListener

eu.europa.ted.efx.xpath.XPathAttributeLocator

All Implemented Interfaces:

XPath20Listener, org.antlr.v4.runtime.tree.ParseTreeListener

public class XPathAttributeLocator
extends XPath20BaseListener

Uses the XPath20Parser to extract an attribute from an XPath expression. Arguably one could try to do the same thing using regular expressions, however, with the parser we can handle correctly any XPath expression regardless of how complicated it maybe. The reason we need to examine if an XPath expression points to an attribute is because some eForms Fields represent attribute values. This means that these attributes are effectively hidden behind a Field identifier and cannot be visible by the lexical analyzer or the parser. They are only visible to the translator after dereferencing such Field identifiers. At this point, the translator relies on this class to detect the presence of such attributes and translate accordingly.

Constructor Summary

Constructors

Constructor	Description
XPathAttributeLocator()

Method Summary

Modifier and Type	Method	Description
void	enterPredicate(XPath20Parser.PredicateContext ctx)	Enter a parse tree produced by XPath20Parser.predicate().
void	exitAbbrevforwardstep(XPath20Parser.AbbrevforwardstepContext ctx)	Exit a parse tree produced by XPath20Parser.abbrevforwardstep().
void	exitPredicate(XPath20Parser.PredicateContext ctx)	Exit a parse tree produced by XPath20Parser.predicate().
static XPathAttributeLocator	findAttribute(Expression.PathExpression xpath)
String	getAttribute()
Expression.PathExpression	getPath()
Boolean	hasAttribute()

Methods inherited from class eu.europa.ted.efx.xpath.XPath20BaseListener

enterAbbrevforwardstep, enterAbbrevreversestep, enterAdditiveexpr, enterAndexpr, enterAnykindtest, enterAtomictype, enterAttribnameorwildcard, enterAttributedeclaration, enterAttributename, enterAttributetest, enterAuxilary, enterCastableexpr, enterCastexpr, enterCommenttest, enterComparisonexpr, enterContextitemexpr, enterDocumenttest, enterElementdeclaration, enterElementname, enterElementnameorwildcard, enterElementtest, enterEveryRule, enterExpr, enterExprsingle, enterForexpr, enterForwardaxis, enterForwardstep, enterFunctioncall, enterGeneralcomp, enterIfexpr, enterInstanceofexpr, enterIntersectexceptexpr, enterItemtype, enterKindtest, enterLiteral, enterMultiplicativeexpr, enterNametest, enterNodecomp, enterNodetest, enterNumericliteral, enterOccurrenceindicator, enterOrexpr, enterParenthesizedexpr, enterPathexpr, enterPitest, enterPredicatelist, enterPrimaryexpr, enterQname, enterQuantifiedexpr, enterRangeexpr, enterRelativepathexpr, enterReverseaxis, enterReversestep, enterSchemaattributetest, enterSchemaelementtest, enterSequencetype, enterSimpleforclause, enterSingletype, enterStep, enterStepexpr, enterTexttest, enterTreatexpr, enterTypename_, enterUnaryexpr, enterUnionexpr, enterValuecomp, enterValueexpr, enterVarname, enterVarref, enterWildcard, enterXpath, exitAbbrevreversestep, exitAdditiveexpr, exitAndexpr, exitAnykindtest, exitAtomictype, exitAttribnameorwildcard, exitAttributedeclaration, exitAttributename, exitAttributetest, exitAuxilary, exitCastableexpr, exitCastexpr, exitCommenttest, exitComparisonexpr, exitContextitemexpr, exitDocumenttest, exitElementdeclaration, exitElementname, exitElementnameorwildcard, exitElementtest, exitEveryRule, exitExpr, exitExprsingle, exitForexpr, exitForwardaxis, exitForwardstep, exitFunctioncall, exitGeneralcomp, exitIfexpr, exitInstanceofexpr, exitIntersectexceptexpr, exitItemtype, exitKindtest, exitLiteral, exitMultiplicativeexpr, exitNametest, exitNodecomp, exitNodetest, exitNumericliteral, exitOccurrenceindicator, exitOrexpr, exitParenthesizedexpr, exitPathexpr, exitPitest, exitPredicatelist, exitPrimaryexpr, exitQname, exitQuantifiedexpr, exitRangeexpr, exitRelativepathexpr, exitReverseaxis, exitReversestep, exitSchemaattributetest, exitSchemaelementtest, exitSequencetype, exitSimpleforclause, exitSingletype, exitStep, exitStepexpr, exitTexttest, exitTreatexpr, exitTypename_, exitUnaryexpr, exitUnionexpr, exitValuecomp, exitValueexpr, exitVarname, exitVarref, exitWildcard, exitXpath, visitErrorNode, visitTerminal

Methods inherited from class java.lang.Object

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

Constructor Detail

XPathAttributeLocator

public XPathAttributeLocator()

Method Detail

getPath

public Expression.PathExpression getPath()

getAttribute

public String getAttribute()

hasAttribute

public Boolean hasAttribute()

enterPredicate

public void enterPredicate(XPath20Parser.PredicateContext ctx)

Description copied from class: XPath20BaseListener

Enter a parse tree produced by XPath20Parser.predicate().

The default implementation does nothing.

Specified by:

enterPredicate in interface XPath20Listener

Overrides:

enterPredicate in class XPath20BaseListener

Parameters:

ctx - the parse tree

exitPredicate

public void exitPredicate(XPath20Parser.PredicateContext ctx)

Description copied from class: XPath20BaseListener

Exit a parse tree produced by XPath20Parser.predicate().

The default implementation does nothing.

Specified by:

exitPredicate in interface XPath20Listener

Overrides:

exitPredicate in class XPath20BaseListener

Parameters:

ctx - the parse tree

exitAbbrevforwardstep

public void exitAbbrevforwardstep(XPath20Parser.AbbrevforwardstepContext ctx)

Description copied from class: XPath20BaseListener

Exit a parse tree produced by XPath20Parser.abbrevforwardstep().

The default implementation does nothing.

Specified by:

exitAbbrevforwardstep in interface XPath20Listener

Overrides:

exitAbbrevforwardstep in class XPath20BaseListener

Parameters:

ctx - the parse tree

findAttribute

public static XPathAttributeLocator findAttribute(Expression.PathExpression xpath)