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
Fields inherited from interface org.exist.xquery.Expression |
DOT_TEST, EXPRESSION_ID_INVALID, IGNORE_CONTEXT, IN_NODE_CONSTRUCTOR, IN_PREDICATE, IN_UPDATE, IN_WHERE_CLAUSE, NEED_INDEX_INFO, NO_CONTEXT_ID, SINGLE_STEP_EXECUTION, USE_TREE_TRAVERSAL |
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 |
Predicate
public Predicate(XQueryContext context)
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(boolean postOptimization)
- 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 xmldb: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
Copyright (C) Wolfgang Meier. All rights reserved.