org.exist.xquery
Class Predicate

java.lang.Object
  org.exist.xquery.AbstractExpression
      org.exist.xquery.PathExpr
          org.exist.xquery.Predicate

All Implemented Interfaces:

CompiledXQuery, Expression

public class Predicate

extends PathExpr

Handles predicate expressions.

Author:

Wolfgang Meier

Field Summary

Fields inherited from class org.exist.xquery.PathExpr

inPredicate, keepVirtual, LOG, source, steps

Fields inherited from class org.exist.xquery.AbstractExpression

astNode, context, contextDocSet, contextId

Fields inherited from interface org.exist.xquery.Expression

EXPRESSION_ID_INVALID, IGNORE_CONTEXT, IN_PREDICATE, IN_UPDATE, IN_WHERE_CLAUSE, NO_CONTEXT_ID, SINGLE_STEP_EXECUTION

Constructor Summary

Predicate(XQueryContext context)

Method Summary

void	analyze(AnalyzeContextInfo contextInfo) Statically analyze the expression and its subexpressions.
Sequence	evalPredicate(Sequence outerSequence, Sequence contextSequence, int mode)
int	getDependencies() Returns Dependency.DEFAULT_DEPENDENCIES.
void	resetState() Called to inform an expression that it should reset to its initial state.
void	setContextDocSet(DocumentSet contextSet)

Methods inherited from class org.exist.xquery.PathExpr

add, add, addPath, addPredicate, dump, dump, eval, getASTNode, getContext, getDocumentSet, getExpression, getLastExpression, getLength, getLiteralValue, getSource, isValid, replaceLastExpression, reset, returnsType, setContext, setPrimaryAxis, setSource, toString

Methods inherited from class org.exist.xquery.AbstractExpression

eval, getCardinality, getContextDocSet, getContextId, getExpressionId, setASTNode

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.exist.xquery.CompiledXQuery

eval

Constructor Detail

Predicate

public Predicate(XQueryContext context)

Method Detail

getDependencies

public int getDependencies()

Description copied from class: AbstractExpression

Returns Dependency.DEFAULT_DEPENDENCIES.

Specified by:

getDependencies in interface Expression

Overrides:

getDependencies in class PathExpr

analyze

public void analyze(AnalyzeContextInfo contextInfo)
             throws XPathException

Description copied from interface: Expression

Statically analyze the expression and its subexpressions. During the static analysis phase, the query engine can detect unknown variables and some type errors.

Specified by:

analyze in interface Expression

Overrides:

analyze in class PathExpr

Throws:

XPathException

evalPredicate

public Sequence evalPredicate(Sequence outerSequence,
                              Sequence contextSequence,
                              int mode)
                       throws XPathException

Throws:

XPathException

setContextDocSet

public void setContextDocSet(DocumentSet contextSet)

Specified by:

setContextDocSet in interface Expression

Overrides:

setContextDocSet in class AbstractExpression

resetState

public void resetState()

Description copied from interface: Expression

Called to inform an expression that it should reset to its initial state. All cached data in the expression object should be dropped. For example, the document() function calls this method whenever the input document set has changed.

Specified by:

resetState in interface Expression

Overrides:

resetState in class PathExpr