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, CompiledExpression

public class Predicate
extends PathExpr

Handles predicate expressions.

Author:

Wolfgang Meier

Field Summary

Fields inherited from interface org.exist.xquery.Expression

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

Constructor Summary

Predicate(XQueryContext context)

Method Summary

void	accept(ExpressionVisitor visitor) Start traversing the expression tree using the specified ExpressionVisitor.
void	analyze(AnalyzeContextInfo contextInfo) Statically analyze the expression and its subexpressions.
void	dump(ExpressionDumper dumper) Write a diagnostic dump of the expression to the passed ExpressionDumper.
Sequence	evalPredicate(Sequence outerSequence, Sequence contextSequence, int mode)
int	getDependencies() Returns Dependency.DEFAULT_DEPENDENCIES.
Expression	getParent()
void	resetState() Called to inform an expression that it should reset to its initial state.
void	setContextDocSet(DocumentSet contextSet)
String	toString()

Methods inherited from class org.exist.xquery.PathExpr

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

Methods inherited from class org.exist.xquery.AbstractExpression

eval, getContextDocSet, getContextId, getExpressionId, setASTNode

Methods inherited from class java.lang.Object

equals, 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

Returns:

set of bit-flags

See Also:

Expression.getDependencies()

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

getParent

public Expression getParent()

Overrides:

getParent in class PathExpr

accept

public void accept(ExpressionVisitor visitor)

Description copied from interface: Expression

Start traversing the expression tree using the specified ExpressionVisitor.

Specified by:

accept in interface Expression

Overrides:

accept in class PathExpr

dump

public void dump(ExpressionDumper dumper)

Description copied from interface: Expression

Write a diagnostic dump of the expression to the passed ExpressionDumper.

Specified by:

dump in interface Expression

Overrides:

dump in class PathExpr

Parameters:

dumper - the expression dumper to write to

toString

public String toString()

Overrides:

toString in class PathExpr